API Development & System Integration
Reliable REST APIs and system integrations — payment gateways, HRIS, logistics, webhooks — my core specialty, not a side offering.
- 4+ years of enterprise apps (Dubai)
- Replies < 24 hours
- Free estimate
Why this matters
This is my core specialty — not an add-on. The same backend standards that run payroll, cashier, and inventory in a production ERP (Dexova) go into your project: REST APIs for mobile/web apps, payment webhooks that never lose a transaction, or connecting systems that currently run in isolation (POS not syncing with inventory, HRIS not feeding payroll). Three priorities: secure, reliable, and observable when something goes wrong.
What you get
- Secure, documented REST APIs (JWT/OAuth2 auth, validation, rate limiting, OpenAPI/Swagger)
- Payment gateway integration with HMAC-verified webhooks — no fake or lost transactions
- Other third-party integrations: HRIS, logistics/shipping APIs, email, calendars
- Reliable webhooks & service-to-service communication (retries, idempotency, HTTP/gRPC)
- Observability: structured logging, metrics, and tracing so problems surface fast
- Clean architecture + tests so the system stays safe to maintain and extend
Transparent from kickoff to release
01
Scope & estimate
We discuss goals, needs, and constraints. I help define a clear scope plus a time/cost estimate — free, no commitment.
02
Design & build
I work in stages with regular updates. You see progress as it happens, not work behind a curtain.
03
Release & support
Deploy to production, hand over documentation, plus a support window for fixes and adjustments.
Proven in production projects
Frequently asked questions
I just need to connect two systems — is that too small?
Not at all. Integrations (e.g. connecting a website to an HRIS, or a POS to inventory) are the work I handle most often — it doesn't have to be a big project.
Can you integrate payment gateways?
Yes — this is what I run in production: QRIS payments via Midtrans in Dexova's POS, with automatic webhook confirmation and signature verification so no transaction is faked or lost. The same patterns apply to other gateways.
Will the API work for our mobile app?
Yes. The APIs I build are client-agnostic — consumable by web, mobile (Android/iOS), or other services, with clear versioning.
Do we get API documentation?
Yes. I deliver OpenAPI/Swagger documentation so your team or other developers can use the API without back-and-forth.
Can you connect a legacy system?
Usually yes, as long as the legacy system exposes a database or callable endpoint. I audit it first, then recommend the safest integration pattern — without rewriting the old system.
How do you handle security?
My standard: token authentication, input validation, rate limiting, security headers, HMAC verification for webhooks, and vulnerability scanning before release.
Tell me what you need
Free discussion & estimate, no commitment. I usually reply within 24 hours.
Other services:Custom POS System DevelopmentCustom HRIS & Payroll System Development