Tolga EGE

API and Integration Development

REST, GraphQL and custom APIs — secure, scalable data flow between your systems.

API and integration development; building bridges that let different systems (website, mobile app, ERP, CRM, payment, shipping, e-invoice) talk to each other. Properly designed APIs and robust integrations prevent data duplication, reduce manual work, increase system reliability.

As Tolga Ege we design your own APIs with REST, GraphQL and tRPC; integrate with third-party APIs (Stripe, payment processors, marketplaces, ERPs, shipping companies, e-invoice, SMS, social media, AI providers). We work with production-grade practices: OAuth 2 / JWT auth, rate limiting, error handling, retry strategies, webhook management.

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REST vs GraphQL vs tRPC

REST: mature, wide ecosystem, multiple endpoints. GraphQL: single endpoint, flexible queries, frontend-friendly. tRPC: TypeScript-first, end-to-end type safety.

Third-party Integration Strategies

Webhook (push), polling (pull), event bus, message queue (RabbitMQ, Kafka). Which integration uses which approach decided based on SLA and data consistency.

Security and Auth

OAuth 2.0, JWT, API key, mTLS, rate limiting, request signing, IP whitelist. Choice per integration based on risk model.

Error Handling and Resilience

Retry exponential backoff, circuit breaker, dead letter queue, idempotency key, monitoring (Sentry, Datadog).

Use Cases

E-commerce ERP Integration

Order, stock, invoice sync with SAP/Microsoft Dynamics.

Marketplace Integration

Amazon, eBay, Etsy API integration.

Payment + Shipping + e-Invoice

Stripe + UPS/FedEx + Avalara/TaxJar.

Your Own Public API

API + documentation served to your customers.

Microservice Architecture

Migration from monolith to microservices.

Technology Stack

Node.js Laravel Python (FastAPI) GraphQL tRPC OpenAPI / Swagger RabbitMQ Kafka Redis OAuth 2.0 JWT

How We Work

  1. API Design — OpenAPI spec, endpoint, contract.
  2. Auth & Security — OAuth, rate limit, request signing.
  3. Development — Versioning, error standard.
  4. Documentation — Swagger UI, postman collection.
  5. Test & Load Test — Contract test, k6 load test.
  6. Launch & Monitor — Prod, alerting, rate dashboard.

Pricing Approach

Single integration: $750 - $3K. Multi-integration package: $3K - $12K. Public API + docs: $5K+.

See full pricing & packages →

Frequently Asked Questions

REST for simple CRUD and wide client compatibility. GraphQL if complex data structure or mobile + web sharing same API. tRPC ideal in TypeScript ecosystem.

Idempotency key + retry queue + dead letter queue. We re-process dropped webhooks from DLQ automatically or manually.

We write adapter API around existing software; integration via database, file, email, RPA methods.

Cache (Redis), CDN edge, database index, GraphQL persisted query, batch endpoint, response compression.

Versioning (v1, v2), rate limiting, open documentation, OpenAPI spec, terms of service, deprecation policy, monitoring.

Read the Pillar Guide

For an in-depth article on this topic with cost breakdowns, real examples and 2026 trends, see our pillar guide.

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