App Development / Focused Capability

One In-House Team / Built For Scale

Best API Development & Integration Service in Bangladesh

Every app, website, and internal tool eventually needs to talk to something else: a payment processor, a CRM, another team's system, or an API of its own. Framecipher builds and integrates APIs for startups and businesses in Dhaka, and for clients across the US, UK, Australia, Canada, and UAE, so that data actually moves correctly between systems instead of breaking quietly somewhere in the middle.

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REST & GraphQL Architecture

Custom contract design, versioning schemes, and predictable schema structures built around your business logic

Third-Party & Payment Gateways

Robust connections to bKash, Nagad, Stripe, PayPal, CRMs, ERPs, logistics, and banking APIs

Fault Tolerance & Idempotency

Webhook retries, rate limiting, and failure recovery workflows to eliminate silent data drops

Observability & SLA Monitoring

Real-time uptime tracking, latency analysis, automated health checks, and instant failure alerting

Core Offerings

Our API Development & Integration Services

We handle API projects from architecture and development through integration, testing, monitoring, and ongoing improvement.

Service 01

API Strategy & Planning

A reliable API starts with understanding how your business systems work together. We first map your requirements, existing infrastructure, data flows, and integration dependencies before development begins.

Business and technical requirements
Existing systems and infrastructure
API consumers and connected applications
Data flow between systems
Third-party integration dependencies
REST or GraphQL approach
Scalability and performance requirements
Project constraints and implementation priorities
Long-term maintenance considerations

This gives the project a clear direction before we move into technical API architecture and contract design.

Service 02

Custom API Development

We build custom APIs around your application's actual business logic and data model. Depending on the project, this can include REST or GraphQL APIs for websites, mobile apps, SaaS products, internal systems, and partner platforms.

REST API development
GraphQL API development
Authentication and authorization
Request validation
Response formatting
Error handling
Pagination and filtering
API versioning
Database integration
Webhook endpoints

The result is an API that your own applications, partners, or approved third-party systems can consume.

Service 03

API Integration & Connectivity

We connect your application with the external systems it needs to exchange data with. This may include payment platforms, CRMs, ERPs, ecommerce systems, banking services, logistics platforms, SaaS tools, and other business applications. Our integration work covers authentication, data mapping, request and response handling, webhooks, error handling, and integration testing based on each system's requirements.

Service 04

API Testing & Quality Assurance

An API should not only work when everything goes right. We test normal requests, invalid inputs, authentication failures, integration errors, webhook behavior, and other realistic conditions.

Functional API testing
Integration testing
Endpoint testing
Authentication testing
Error-response testing
Contract testing
Load testing
Performance testing
Failure-scenario testing
Regression testing

This helps identify problems before they affect customers or connected systems.

Service 05

API Monitoring & Observability

API reliability does not end when an integration goes live. We monitor critical API behavior so problems can be identified before they disrupt connected systems.

API uptime and availability
Response-time monitoring
Error-rate tracking
Webhook status
Health checks
API and application logs
Failure alerts

Service 06

API Maintenance & Support

APIs need ongoing attention as applications, traffic, and connected platforms change. We provide maintenance when your API needs updates, troubleshooting, or continued technical support.

API version updates
Third-party API change updates
Documentation updates
Performance improvements
Security updates
Integration troubleshooting
Bug fixes and technical adjustments
Monitoring and reliability improvements

Ongoing maintenance is available separately when a project requires continued API support.

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Architecture Styles

API Types We Build

Different applications need different API architectures. We select the approach based on how your systems exchange and consume data.

Type 01

REST API Development

We build REST APIs with structured resources, predictable endpoints, appropriate HTTP methods, validation, authentication, error handling, pagination, and versioning. REST APIs work well for websites, mobile applications, SaaS platforms, internal systems, and third-party integrations.

Type 02

GraphQL API Development

GraphQL can help applications request the specific data they need through a defined schema. We can develop GraphQL APIs when the application's data structure and client requirements make the approach appropriate.

Type 03

Web API Development

We build web-facing APIs that allow applications and services to exchange data over web protocols. Depending on the project, a web API can support browser-based applications, mobile applications, backend services, client portals, dashboards, external integrations, and internal business tools. The API design depends on the application's consumers, data requirements, security model, and integration needs.

Type 04

Internal APIs

Internal APIs connect different applications or services within the same organization. They can help separate systems while maintaining controlled communication between them.

Examples:

Website to ERP
Ecommerce platform to inventory system
CRM to internal application
Mobile app to backend
Admin panel to business system

Type 05

Public & Partner APIs

If your customers, vendors, developers, or business partners need controlled access to your platform, we can design APIs around that requirement.

Includes:

Authentication & authorization
API keys or tokens
Access scopes & rate limits
Versioning & documentation
Usage controls & partner onboarding

Type 06

Webhook & Event APIs

Webhooks allow one system to notify another when something happens. We can implement webhook-based workflows for events such as payment confirmation, order creation, shipment updates, customer updates, subscription events, inventory changes, and status notifications. Where required, we add retry and failure handling so temporary delivery problems do not silently lose important events.

Type 07

Microservice APIs

For applications using multiple services, APIs can provide controlled communication between independent components. We can design service-to-service APIs around the application's architecture, data requirements, authentication model, and scaling needs.

Type 08

Event-Driven & Streaming APIs

We build real-time event pipelines and streaming APIs using WebSockets, Server-Sent Events (SSE), and message brokers (Kafka, RabbitMQ) for live chats, telemetry, bidding, and low-latency status updates.

Type 09

B2B & Partner Integration APIs

High-throughput, authenticated endpoints architected for third-party vendors, suppliers, and enterprise partners with dedicated token scoping, IP whitelisting, custom rate tiers, and rigorous SLAs.

Third-Party Ecosystems

Third-Party API Integration Services

Connecting an API is not simply about sending a request and receiving a response. The integration must account for authentication, data mapping, validation, errors, timeouts, rate limits, webhooks, and changes on the connected platform.

Connector 01

Payment Gateway Integration

We integrate payment services into websites and applications based on the project's requirements. This can include bKash, Nagad, Stripe, PayPal, and other supported payment services. We handle payment requests, responses, transaction status, callbacks, and relevant error scenarios within the agreed project scope.

Connector 02

CRM Integration

Connect your website, application, or internal system with CRM platforms to move customers and lead information between systems. Typical workflows include lead creation, customer synchronization, contact updates, form submission transfer, sales-status updates, and marketing data synchronization.

Connector 03

ERP & Accounting Integration

We connect applications with ERP, accounting, inventory, and business-management systems where APIs are available. This can help synchronize products, customers, orders, inventory, invoices, payment information, and operational data.

Connector 04

Ecommerce API Integration

We integrate ecommerce systems with other services required by the business, such as payment systems, inventory systems, CRM platforms, shipping services, accounting software, ERP systems, and marketing platforms.

Connector 05

Banking & Financial API Integration

For projects that require financial or banking connectivity, we can integrate supported banking and financial APIs. The exact integration depends on the provider's API, authentication requirements, access permissions, and available documentation.

Connector 06

Logistics & Shipping API Integration

Connect ecommerce and business systems with logistics or delivery platforms. Possible workflows include order submission, shipment creation, tracking updates, delivery status, customer notifications, and delivery-data synchronization.

Connector 07

SaaS & Third-Party Platform Integration

We connect your application with SaaS platforms and external services when their APIs support the required workflow. The integration can include authentication, data mapping, scheduled synchronization, webhooks, error handling, and monitoring.

Connector 08

Legacy System Integration

Older systems often cannot be replaced immediately. We can build an integration layer between legacy systems and newer applications where the available interfaces and project requirements support it. This can reduce the need for direct point-to-point connections across every system.

Schema & Specifications

API Architecture & Contract Design

Once the project requirements are clear, we define the technical structure of the API. This creates a predictable contract between your application, users, and connected systems.

Resource and endpoint design

Request and response schemas

OpenAPI and API specifications

Security requirements and access model

API versioning

Backward compatibility

Data validation rules

Error response standards

Integration and dependency mapping

Contract design for connected applications

Access Governance

API Security & Access Control

Security needs to be considered before an API reaches production. We design security controls around the application's users, integrations, data, and access requirements.

Security Pillar 01

Authentication

Authentication verifies who or what is making an API request. Depending on the project, this may use API keys, tokens, OAuth, or another appropriate authentication mechanism.

Security Pillar 02

Authorization

Authentication alone does not determine what a consumer can access. Authorization controls which resources and actions each user, application, or partner can access.

Security Pillar 03

Rate Limiting

Rate limiting helps control excessive requests and protect APIs from unexpected traffic or abuse. Limits are planned around the API's expected usage and business requirements.

Security Pillar 04

Input Validation

Incoming data should not be trusted automatically. We validate requests and reject invalid or unexpected data before it reaches sensitive business logic or connected systems.

Security Pillar 05

API Gateway Security

Where the architecture requires an API gateway, it can provide a centralized layer for authentication, routing, rate limiting, traffic control, and monitoring.

Security Pillar 06

Sensitive Data Protection

API responses should expose only the data required by the consumer. We consider data exposure, access permissions, credentials, and sensitive information when designing API workflows.

Security Pillar 07

Security Testing

Security checks can be included within API testing based on the project's scope and requirements.

Security Pillar 08

Audit Logging & Compliance

Capture comprehensive request and response telemetry, security access logs, and administrative actions with immutable audit trails to meet regulatory and corporate security policies.

Resilience Engineering

API Reliability & Failure Handling

Connected systems can fail for many reasons. An API may time out, receive duplicate requests, lose a third-party connection, or return an unexpected response. We design failure handling around these scenarios:

Retry and backoff logic

Idempotency for duplicate requests

Timeout and error handling

Webhook retry and delivery reliability

Failure recovery workflows

Logging and observability

Critical failure alerting

Partial-failure handling

Recovery and troubleshooting procedures

Throughput & Latency

API Performance & Scalability

An API that works with ten users may behave differently when traffic grows. We consider performance during architecture, development, testing, and optimization.

Optimization 01

Response Time Optimization

We identify slow endpoints and reduce unnecessary processing where possible.

Optimization 02

Database Query Optimization

Slow database queries can become an API bottleneck. We review database interactions and optimize queries where the project requires it.

Optimization 03

Caching

Caching can reduce repeated processing and database load for suitable data. We use caching only where the data and freshness requirements make it appropriate.

Optimization 04

Pagination & Data Retrieval

Large datasets should not always be returned in one response. Pagination and controlled data retrieval can improve response size and application performance.

Optimization 05

Load & Stress Testing

Testing under increased traffic helps reveal bottlenecks before production. The testing level depends on the expected traffic and project scope.

Optimization 06

Horizontal Scaling

Applications with growing traffic may need additional application instances or other scaling strategies. We consider scalability during architecture planning when the expected workload requires it.

Optimization 07

Performance Monitoring

Response time, error rate, traffic, and other relevant metrics can be monitored after deployment. This gives the team visibility as API usage changes.

Optimization 08

Edge Caching & CDN Distribution

Deploy read-heavy API responses, media endpoints, and static resources to global edge networks and distributed Redis clusters to minimize server load and geographical latency.

DX & Tooling

API Documentation & Developer Experience

A technically good API can still create problems if nobody knows how to use it. Documentation should help your internal developers, external partners, and future team members understand the API without reverse-engineering the code.

DX Pillar 01

OpenAPI & Swagger Documentation

Where appropriate, we provide API documentation using OpenAPI/Swagger or another suitable documentation approach. Documentation can cover endpoints, parameters, authentication, responses, and errors.

DX Pillar 02

Interactive API Documentation

Interactive documentation can allow developers to understand and test available endpoints more easily. The exact documentation setup depends on the API architecture and project requirements.

DX Pillar 03

Request & Response Examples

Examples make API documentation easier to follow. We can document sample requests, responses, parameters, authentication requirements, and common error scenarios.

DX Pillar 04

Developer Onboarding

When another developer or team needs to consume the API, clear documentation reduces unnecessary back-and-forth. We structure documentation around the information they actually need to integrate.

DX Pillar 05

Sandbox Environments

For suitable projects, a sandbox or testing environment can allow consumers to test API workflows without affecting live production data.

DX Pillar 06

Partner API Documentation

If your API is intended for vendors, customers, or business partners, documentation can include onboarding instructions and access requirements.

DX Pillar 07

API Handoff & Knowledge Transfer

At project completion, we provide the agreed documentation and handoff materials so your team can understand and continue working with the API.

DX Pillar 08

Client SDKs & Code Samples

Provide client code snippets and helper SDKs across JavaScript, Python, PHP, and mobile platforms so developers can integrate your endpoints in minutes instead of days.

Refactoring & Upgrade

API Audit, Optimization & Modernization

You do not always need a new API. Sometimes the existing API is the problem.

We can review an existing API and identify areas that need improvement.

Audit Area 01

Existing API Assessment

We review the current architecture, endpoints, integrations, documentation, and known operational issues.

Audit Area 02

API Security Review

We assess authentication, authorization, exposed data, access controls, and other relevant security areas within the agreed scope.

Audit Area 03

API Performance Audit

We identify slow endpoints, inefficient queries, excessive requests, and other performance bottlenecks.

Audit Area 04

API Refactoring

Existing API code can become difficult to maintain as a product grows. We can refactor suitable parts while preserving required functionality.

Audit Area 05

Legacy API Modernization

Older APIs may need improved documentation, security, architecture, or integration patterns. We can modernize legacy API components where the existing system and available interfaces allow it.

Audit Area 06

Versioning & Deprecation Planning

If an existing API has multiple consumers, changes need careful planning. We can help structure versioning and deprecation so consumers have a clear migration path.

Audit Area 07

Integration Troubleshooting

If an integration already exists but does not behave reliably, we can investigate the data flow and identify the failure point.

Audit Area 08

CI/CD Automated Contract Testing

Integrate automated contract verification and schema diffing into continuous deployment pipelines so breaking API changes never reach production systems.

Stack & Frameworks

API Technology & Tooling

We select API technologies and supporting tools based on your application's requirements, existing infrastructure, integration needs, and long-term maintenance. Our API projects can involve:

REST APIs

GraphQL

Webhooks

OpenAPI and Swagger

OAuth and token-based authentication

API keys and access controls

Database integration

Caching

Automated API testing

Logging and monitoring

Cloud and existing infrastructure

Message Queues & Event Streaming

The final technology choices depend on the project's architecture, existing systems, and technical requirements.

Business Workflows

API Development Use Cases

APIs support many different business workflows. We design the API around what your application and connected systems actually need to accomplish.

Use Case 01

Web & Mobile Applications

Connect web and mobile applications to backend systems, databases, authentication services, and business logic.

Use Case 02

SaaS Platforms

Build APIs that allow SaaS applications to communicate with web clients, mobile applications, integrations, and external users.

Use Case 03

Ecommerce Systems

Connect stores with payment, inventory, CRM, ERP, accounting, shipping, and marketing systems.

Use Case 04

Payment & Financial Workflows

Connect applications with supported payment gateways, banking services, transaction systems, and financial workflows.

Use Case 05

CRM & ERP Connectivity

Synchronize customer, order, inventory, accounting, and operational data between systems.

Use Case 06

Internal Business Systems

Connect internal applications, dashboards, admin panels, databases, and operational tools.

Use Case 07

Partner Platforms

Build controlled API access for vendors, customers, affiliates, marketplaces, and other approved partners.

Use Case 08

Real-Time Data Synchronization

Use webhooks and event-based workflows where systems need timely updates without constant polling.

Use Case 09

Business Automation

Connect multiple systems so repetitive data-transfer workflows can happen automatically.

Infrastructure Risk

Why Your Business Needs a Real API Partner

Pillar 01

Silent Failures Are the Real Risk

A failed API request is not always obvious. Data may stop syncing. A webhook may fail. A payment status may not update. An external service may return an unexpected response. We design integrations to detect and handle these situations rather than assuming every request will succeed.

Pillar 02

Third-Party APIs Keep Changing

Your integration depends partly on another company's system. Third-party providers can change endpoints, authentication requirements, response formats, rate limits, or API versions. That is why version planning, error handling, monitoring, and ongoing maintenance matter.

Pillar 03

APIs Become Long-Term Infrastructure

An API can become the connection point between your website, mobile app, internal systems, partners, and external services. A rushed API decision can create maintenance problems later. We focus on clear architecture and documentation so the API remains useful as your business grows.

Agency Differentiators

Why Choose Framecipher for API Development & Integration

Advantage 01

One In-House Team

Strategy, development, integration, testing, and communication stay within one team. You do not need to coordinate separate vendors for each technical stage.

Advantage 02

Built for Failure, Not Just Success

We do not treat the successful API response as the entire integration. Timeouts, errors, failed webhooks, unavailable services, and unexpected responses are part of real-world API behavior.

Advantage 03

Architecture Before Implementation

We define the API structure, authentication approach, data flow, and integration requirements before development gets too far.

Advantage 04

Built Around Your Existing Systems

We work around the systems you already use instead of assuming everything needs to be replaced.

Advantage 05

Local & International Integration Experience

Framecipher is based in Dhaka and serves businesses in Bangladesh alongside clients in the UAE, US, UK, Australia, and Canada. Our integration work can involve local platforms such as bKash and Nagad alongside international services.

Advantage 06

Transparent Review Process

You receive defined review points throughout the project. The goal is to make technical progress visible instead of presenting everything only at the end.

Advantage 07

Long-Term Support

API work often continues after launch. When needed, we can support version updates, third-party API changes, performance improvements, security updates, and integration troubleshooting.

Advantage 08

Zero Lock-In & Full IP Ownership

You retain 100% intellectual property ownership of your API architecture, code, schema specifications, and documentation with zero restrictive vendor lock-in.

Domestic & Global Reach

API Development Services Across Bangladesh & Worldwide

Framecipher is based in Dhaka, Bangladesh, and provides API development and integration services for businesses in Bangladesh and international markets.

Bangladesh

For Bangladeshi businesses, API projects can include local payment and banking integrations alongside international platforms. Common requirements may include: bKash integration, Nagad integration, local banking APIs, ecommerce integrations, CRM and ERP connectivity, logistics integrations, and internal business systems.

International Clients

We also work with clients in the United States, United Kingdom, Australia, Canada, and United Arab Emirates. Framecipher has worked with businesses across 20+ countries, supporting API and integration projects across different markets and technical environments.

Different markets can involve different payment providers, systems, access requirements, and compliance considerations. We account for those differences during project discovery.

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Our Engineering Methodology

How We Approach an API Development or Integration Project

Our process keeps architecture, development, testing, and launch connected.

Discovery & Requirements

We start by understanding what needs to connect, which systems are involved, what data must move, who will consume the API, authentication requirements, existing API documentation, expected traffic, business-critical workflows, and known integration problems.

What needs to connect
Which systems are involved
What data must move
Who will consume the API
Authentication requirements
Existing API documentation
Expected traffic
Business-critical workflows
Known integration problems

You receive:

a clear understanding of the required API or integration scope.

Technical Design & API Specification

We define endpoints, resources, data structures, authentication, versioning, errors, and integration patterns.

You receive:

an agreed technical direction before development begins.

Development & Integration

We build the API or connect the required third-party systems. Documentation is developed alongside the implementation rather than being left until the end.

You receive:

the agreed API or integration functionality.

Testing & Reliability Review

We test normal workflows and failure conditions. This can include integration, functional, load, security, webhook, and error-handling tests based on scope.

You receive:

a tested implementation ready for deployment.

Deployment, Monitoring & Handoff

We deploy the approved work, confirm data flow, configure agreed monitoring, and provide documentation or handoff materials.

You receive:

a production-ready API or integration with the agreed launch and handoff setup.

Post-Launch Observability & Optimization

We monitor telemetry, response latencies, and error budgets in production, continuously fine-tuning queries, rate limits, and caching policies as API traffic grows.

Depending on the selected scope, projects can include:

Strategy and architecture
API development
Third-party integration
Authentication and authorization
API documentation
Integration testing
Load or performance testing
Error handling
Webhook implementation
Retry handling
Monitoring and alerting
Launch support

Prices shown are starting guidelines. The final proposal confirms the project scope, fee, deliverables, and delivery schedule before work begins.

What Can Affect the Timeline?

Most API and integration projects take 1–8+ weeks. A single third-party integration usually moves faster than a multi-system integration. Projects can take longer when they involve:

Multiple systems
Complex data mapping
Legacy infrastructure
Custom authentication
High-volume synchronization
Extensive testing
Compliance requirements
Limited third-party documentation

Projects also move faster when third-party documentation, credentials, API access, and required approvals are available early.

Project Scope, Review & Support

Clear scope helps prevent unexpected development changes.

Checkpoint 01

Project Scope

Before development starts, we define the agreed functionality, integrations, deliverables, timeline, and responsibilities.

Checkpoint 02

Stakeholder Reviews

Architecture, development, and testing stages include review points where applicable. Your approval helps ensure the project continues in the agreed direction.

Checkpoint 03

Third-Party Dependencies

Some API behavior depends on external providers. We cannot guarantee that a third-party service will never experience an outage, change its API, reject requests, or introduce new requirements. We can, however, build agreed error handling, retry logic, monitoring, and recovery mechanisms around those dependencies.

Checkpoint 04

Change Requests

Requests outside the agreed scope may require additional development time and cost. Any significant scope change should be reviewed before implementation.

Checkpoint 05

Post-Launch Support

Launch support can include checking the deployed integration, confirming expected data flow, and addressing agreed launch issues. Ongoing API maintenance is available separately.

Checkpoint 06

Workmanship Warranty

Any workmanship warranty should follow the warranty period and terms stated in the final proposal or project agreement. Third-party outages, provider-side API changes, new requirements, and functionality outside the approved scope are not treated as development defects.

Direct Answers

Frequently Asked Questions

Common questions about our delivery process, technical standards, and engagement models.

Do you build custom APIs, or just connect to existing ones?+

Both, custom API development for your own product or internal use, and integration work connecting to third-party services like payment processors, CRMs, or ERPs.

What happens if a third-party API we depend on changes or goes down?+

We build retry logic, fallback handling, and monitoring into integrations from the start, so a temporary outage gets caught and handled instead of silently failing. For ongoing changes to a connected service's API, that's covered under maintenance.

Do you provide API documentation?+

Yes, documentation is built alongside custom API development, not treated as an afterthought, so your team or external partners can actually use what's been built.

Can you integrate local Bangladeshi payment systems like bKash or Nagad?+

Yes, bKash, Nagad, and similar local payment integrations are part of our regular integration work, alongside international payment platforms where a project needs both.

Do you work with clients outside Bangladesh?+

Yes, alongside Bangladeshi businesses, we build and integrate APIs for clients in the US, UK, Australia, Canada, and UAE.

Ready to Connect Your Systems?

Start Your API Development Project

Whether you need a custom API, a payment integration, a CRM connection, a multi-system data flow, or help fixing an unreliable existing API, we can start by reviewing what you already have. Tell us which systems need to connect, what data needs to move, whether you need a new API or an integration, which third-party services are involved, any existing API documentation, and your expected timeline. We will review the requirements and determine the appropriate technical approach.

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