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VELTROTECHLABS

Custom API Development

APIs that feel like a product, not an afterthought

An API is a product your developers consume daily. We design contracts first, version intentionally, and ship with generated SDKs, interactive docs, and observability built in - so integration takes hours, not days.

Discuss your requirementsSee what we build

Contract-first design

OpenAPI/GraphQL schemas reviewed with your team before code. Breaking changes caught in CI, not production.

Auth, rate limits, quotas from day one

OAuth2/OIDC, API keys, scoped permissions, adaptive throttling - security baked in, not bolted on.

Developer experience as default

Auto-generated TypeScript/Python/Go SDKs, interactive playground, request/response examples, and versioned changelogs.

Scope

What you get

A typical engagement includes everything below. We scope up or down after discovery rather than guessing at the start.

  • API design and schema (OpenAPI 3.1 / GraphQL SDL)
  • Authentication and authorization (OAuth2, OIDC, API keys)
  • Rate limiting, quotas, and abuse protection
  • Request validation and structured error responses
  • Auto-generated client SDKs (TypeScript, Python, Go)
  • Interactive API documentation (Scalar/Swagger UI)
  • Observability: logging, metrics, distributed tracing
  • Versioning strategy and deprecation policy
  • Load testing and performance benchmarks
  • Handover docs and team onboarding

Approach

Technology-neutral delivery

We don't push a fixed stack. After discovery, we recommend the technologies that best fit your requirements, team, and long-term maintenance - whether that's .NET, Java, Node.js, Python, Go, React, or something else. If your team already runs a specific stack, we work in it.

Technology-agnosticWe adapt to your stackSenior specialists hired per project

Technologies we use

TypeScript, Node.js, Fastify, ExpressPython, FastAPI, Django REST FrameworkGo, Gin, gRPC, Protocol BuffersGraphQL, Apollo, HasuraPostgreSQL, Redis, MongoDBDocker, Kubernetes, Kong, EnvoyGitHub Actions, GitLab CI, ArgoCD

How this engagement typically runs

01

Discovery

Map your API consumers, their needs, and the data flows — producing a contract-first specification reviewed with your team.

02

Architecture

Define schemas, auth model, rate limiting strategy, and versioning approach sized for scale and team velocity.

03

Design

Interactive API docs and playground built from the spec; consumers test integration before implementation starts.

04

Build

Two-week sprints delivering versioned endpoints with generated SDKs, contract tests, and observability in every deploy.

05

Launch

Canary deployments, automated contract validation, and a deprecation policy consumers can rely on.

06

Evolve

Changelog-driven updates, backward-compatible additions by default, and migration guides for breaking changes.

What this looks like built

FAQ

Custom API Development - common questions

REST for broad compatibility and caching, GraphQL for flexible client queries, gRPC for high-performance internal services. We help you decide based on consumers, team expertise, and infrastructure.
Yes. We generate typed client SDKs for TypeScript, Python, and Go from the OpenAPI/GraphQL schema, kept in sync via CI. Consumers install via npm/pip/go get.
Absolutely. We frequently wrap legacy databases, SOAP services, or internal modules with a clean, versioned API facade - including transformation, caching, and auth.
URL versioning (/v1/, /v2/) with clear deprecation timelines, backward-compatible additions, and automated consumer notification. Breaking changes only in new major versions.
OAuth2/OIDC or API keys from day one, scoped permissions, adaptive rate limiting, request validation, and structured error responses that don't leak internals.
We ship with distributed tracing, metrics, and logging from day one. Load testing and performance benchmarks are part of every delivery.

Keep exploring

Other services

Custom Software Development

Bespoke platforms, internal tools and ERP-grade systems built around how your business actually works.

Web Application Development

Fast, accessible, SEO-ready web products - from marketing sites to complex multi-tenant SaaS dashboards.

Mobile App Development

iOS and Android apps from one codebase, or fully native where the product demands it.

Have a project in mind?

Tell us what you are trying to build. You will get a straight answer on feasibility, timeline and cost - and if we are the wrong fit, we will say so.

Start the conversationor email sales@veltrotechlabs.in