Devintek builds custom REST APIs and connects your systems to payment gateways, CRMs, ERPs, couriers and SaaS tools, with retries, monitoring and documentation.
01 / A better starting point
Is Your API Integration Costing You Customers Every Day?
Most businesses lose customers every day to underperforming API integration. If any of these sound familiar, you are losing revenue right now:
02 / Built around your ambition
Our custom API integration services — 8 Smart Solutions
- 01
REST and GraphQL API integration
We connect your systems to third-party REST and GraphQL APIs with typed clients, schema validation and versioning, so data moves reliably in both directions.
- 02
Webhook design and reliability
Incoming webhooks are verified, queued and processed idempotently, with dead-letter handling so no payment, order or status event is silently lost.
- 03
OAuth 2.0 and JWT authentication
We implement OAuth 2.0 flows, token refresh and JWT validation with secrets stored securely, keeping access scoped to exactly what each integration needs.
- 04
Rate limiting and retry strategies
Requests are throttled to provider limits, with exponential backoff and queued retries that keep workflows running smoothly through traffic spikes and outages.
- 05
API middleware and ETL pipelines
Middleware and ETL pipelines in Node.js, Laravel, Python or Go transform, validate and route data between systems that were never designed to talk.
- 06
Real-time data synchronisation
Event-driven sync keeps inventory, customer and order records consistent across platforms in near real time, with conflict rules for competing updates.
- 07
Observability: logs, metrics, traces
Structured logs, metrics and traces feed dashboards and alerts, so your team sees integration health at a glance and can trace any failed request quickly.
- 08
Documentation and Postman collections
Each integration ships with API contracts, sequence diagrams, error catalogues, Postman collections and runbooks so your developers can maintain it confidently.
The Payoff
What Custom API Integrations Do for Your Operations
No more copying data between tools
Records flow between your CRM, finance, ecommerce and support systems without anyone re-keying them.
Stable under rate limits
Backoff, batching and request throttling keep integrations working when third-party APIs push back.
Secure authentication handling
OAuth flows, token refresh and secret storage are implemented properly rather than hard-coded.
Code your team can understand
Documented, tested integrations mean the next developer is not left guessing how things connect.
How we work / From idea to impact
Our Custom API Integration Process
- 01
Audit the systems involved
We review each API's documentation, authentication method, rate limits and data model, and note any gaps early.
- 02
Design the data flow
We agree which system owns each field, how conflicts are resolved and what happens when one side is unavailable.
- 03
Build and secure the connection
We implement REST or GraphQL clients, OAuth or key-based auth, and signed webhook endpoints with idempotent processing.
- 04
Test failure scenarios
We simulate timeouts, expired tokens, duplicate webhooks and rate-limit responses to confirm the integration recovers cleanly.
- 05
Deploy with monitoring
The integration goes live with structured logging, retry queues and alerts routed to the right people.
Why Devintek
Why Choose Us for Custom API Integrations
Integrations designed for failure cases, not just the happy path.
Idempotent webhook handling as standard.
Rate limits and quotas planned for before the first request is sent.
Clear documentation and tests handed over with the code.
Comfortable with REST, GraphQL, SOAP and awkward legacy APIs.
No proprietary middleware you have to keep paying for.
Your vision. Our craft.
Strategy, design and development working as one connected team.
Selected Work / Devintek
Case Studies
A closer look at the ideas, craft and collaboration behind our work.
Industries
Industries That Rely on Our API Integration Work
- Ecommerce
- SaaS
- Logistics and fulfilment
- Fintech
- Healthcare technology
- Travel and bookings
- Manufacturing
- Membership organisations
Investment
API Integration Packages From Single Connections to Enterprise Pipelines
Simple Integration
From $5K
- One system-to-system connection
- Authentication and error handling
- Retry and rate limit logic
- Postman collection and docs
Complex Middleware
From $25K
- Multi-system data routing
- Idempotent webhook processing
- Real-time synchronisation
- Logs, metrics and alerting
Enterprise ETL
From $80K
- High-volume data pipelines
- Transformation and validation layers
- Tracing across services
- Runbooks and team handover
FAQ
Frequently Asked Questions
Still have questions?
Our team replies within one business day with a straight answer, not a sales pitch.
Contact usCustom API Development and Third-Party Integration
Devintek provides API development and integration services for businesses whose systems need to share data reliably. That covers two kinds of work: building your own REST APIs, for a mobile app, a partner or your own front end, and integrating third-party APIs such as payment gateways, accounting software, CRMs, couriers and email providers.
Integrations fail in predictable ways: expired tokens, rate limits, duplicate webhooks and partial outages. We design for those from the start with authentication handling, retries, idempotent webhook processing, logging and alerts, and we document every integration so your team can maintain it.
Custom APIs are usually built on Laravel. Integration work is often part of a larger build, such as a SaaS product, a custom CRM or an ERP system. Where a workflow can be handled without custom code, n8n automation is often the faster and cheaper option.
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