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REST & GraphQL APIs
Versioned, documented APIs with consistent error handling, rate limiting, and authentication built in from the start.
- OpenAPI / GraphQL schema
- Versioning strategy
- Rate limiting & auth
OSYSTIC
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A backend that works in development is not the same as one that holds up under load, handles partial failures gracefully, and gives your team visibility to diagnose problems.
We scope around the system you actually need to operate, maintain, and operate — not a fixed vendor product or a one-size-fits-all implementation.
Versioned, documented APIs with consistent error handling, rate limiting, and authentication built in from the start.
Schema design, indexing strategy, query optimisation, and controlled migration plans for PostgreSQL, MySQL, and document databases.
Secure implementation of OAuth 2.0, JWT, session management, and RBAC — built on proven libraries, not custom cryptography.
Service decomposition, inter-service communication patterns, and deployment isolation for systems that need independent scaling.
Structured logging, distributed tracing, and alerting that surfaces failures before users report them.
Each engagement is broken into defined phases with reviewable outputs. Scope can adapt, but accountability stays visible.
Define the target architecture, service boundaries, database schema, and non-functional requirements before any code is written.
Write the OpenAPI specification before implementation. Frontend, backend, and external consumers agree on the contract first.
Schema design, indexing strategy, and controlled migration planning, including low/zero-downtime patterns where the system requires and supports them.
Iterative endpoint implementation with integration tests running against each pull request. No untested code merged.
Load test against realistic traffic profiles. Security review covering OWASP Top 10 and authentication edge cases.
Technology choices follow your environment, operating constraints, team capability, and long-term ownership requirements.
The same technical capability can require very different controls, integrations, and operating models across industries.
Platform APIs, developer tooling backends, SaaS core services, webhook systems.
Payment processing APIs, trading backends, core banking integration, compliance reporting.
FHIR-compatible health data APIs, appointment booking, EHR integration backends.
Order management APIs, inventory sync, pricing engines, fulfilment backends.
The exact architecture and delivery plan depend on your environment. These answers describe how OSYSTIC approaches the work.
Yes, contract-first. We write the OpenAPI spec before implementation begins — it serves as the agreed interface between all consumers.
With versioned, idempotent migrations via Flyway or Alembic. Low/zero-downtime migration patterns can require additive changes and multi-phase deploys; feasibility depends on the application, database, and cutover constraints.
k6 for scripted scenarios, Gatling for complex simulations. Load targets are defined in scoping and tested against before handover.
We implement it — including edge cases like token refresh, session invalidation, concurrent login handling, and MFA. Implementation details matter more than the design here.
Tell us what you are building and what scale you are designing for. We will come back with an architecture proposal.