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APIs your partners can actually build on

We design and build REST and GraphQL APIs with clear contracts, real documentation, and security baked in, so integrations stop being the bottleneck between your product and the systems around it.

  • Clean, versioned API contracts your consumers can trust
  • Documentation written for the developers who integrate
  • Authentication, rate limiting, and auditing from day one
  • Built by a senior team that owns delivery end to end

100% confidential. We can sign an NDA before we talk details.

When integrations become the bottleneck

Most companies do not plan to build an API platform. It happens gradually: a partner asks for access, a mobile app needs data, an internal tool starts scraping the database directly. Before long there are half-documented endpoints, inconsistent authentication, and no one who can say with confidence what will break when something changes.

That state has a real cost. Partner onboarding drags because integration questions land on your engineers instead of your docs. Every new consumer adds risk instead of leverage. And the fear of breaking an undocumented dependency slows down the product work you actually want to do.

Codesigma builds APIs as products, not afterthoughts. We define the contract first, document it properly, secure it deliberately, and version it so consumers can rely on it. Founded in 2015, we cover the full lifecycle from design to deployment to support, and we work NDA-friendly and confidential by default.

Talk to us about your project

The problem

Your systems need to talk to products, partners, and internal tools, but the interfaces between them are ad hoc: undocumented endpoints, inconsistent auth, and integrations that only one engineer understands. Every new consumer means a round of hand-holding, and every change carries the risk of silently breaking someone downstream.

Our approach

We start with the contract, not the code. We map who consumes the API and what they need, design the resources and versioning strategy up front, and write the specification before implementation begins. Then we build the API with authentication, authorization, rate limiting, and logging as first-class concerns, ship documentation alongside the code, and put automated tests around every endpoint so changes are safe.

The outcome

You get an interface layer your partners and teams can build on without asking your engineers how it works. Integrations become self-serve instead of a support burden, changes ship with confidence because contracts and tests catch regressions, and your API becomes an asset you can extend rather than a liability you route around.

What an API engagement includes

Every engagement covers the pieces that make an API dependable, not just the endpoints.

API design and specification

Contract-first design of REST or GraphQL APIs: resource modeling, naming, error shapes, and a versioning strategy agreed before code is written.

Build and implementation

Production implementation in Node.js or Laravel with clean separation between the interface layer and your business logic, so the API stays stable as internals evolve.

Authentication and security

OAuth 2.0, API keys, or token-based auth with role-based access control, rate limiting, input validation, and audit logging designed in from the start.

Documentation developers use

OpenAPI specifications, reference docs, and integration guides written for the people who consume the API, so onboarding does not depend on your engineers.

Third-party and partner integrations

Connecting your systems to payment providers, CRMs, logistics platforms, and partner APIs, with retries, idempotency, and failure handling done properly.

Performance, monitoring, and versioning

Caching, pagination, and query efficiency for scale, plus monitoring and a deprecation process so old versions retire without breaking consumers.

Why Codesigma for API work

A senior, founder-led team

Your API is designed by engineers with 10+ years of software experience, not handed to juniors after the kickoff call.

Clear, direct communication

You talk to the people doing the work. Decisions, trade-offs, and progress are explained plainly, without layers in between.

Ownership of the outcome

We take responsibility for the interface working in production, not just for closing tickets. If a consumer struggles to integrate, that is our problem too.

NDA-friendly and confidential

We work under NDA as a matter of course and treat your systems, data models, and partner relationships as confidential by default.

Full lifecycle coverage

From the first contract draft through deployment, monitoring, and long-term support, one team stays accountable for the whole lifecycle.

Built to outlast the engagement

Specifications, tests, and documentation are deliverables, so your own team can maintain and extend the API without depending on us.

How we deliver an API

  1. Discovery

    We map your systems, the consumers of the API, and the data they need, and surface constraints like auth requirements and existing integrations.

  2. Contract design

    We design the API specification: resources, endpoints, error handling, and versioning. You review the contract before implementation starts.

  3. Build

    We implement the API in iterations, with security, validation, and logging built in, and share working endpoints early for feedback.

  4. Testing and hardening

    Automated tests cover every endpoint and contract, and we exercise failure cases: bad input, auth edge cases, and load behavior.

  5. Launch and handover

    We deploy to your environment, publish documentation, and walk your team and early consumers through integration.

  6. Support and evolution

    We monitor the API in production, manage version changes and deprecations, and extend the surface as new consumers come on board.

Untangle your integrations

Tell us what needs to connect to what. We will come back with a concrete plan for the API layer that makes it work.

Ways to work with us

Most Popular

Dedicated Team

A cross-functional team that owns your API platform end to end, from contract design through production support, and evolves it as consumers grow.

Staff Augmentation

Senior API engineers who join your existing team to accelerate integration work, tighten security, or bring order to a growing endpoint surface.

Project-Based

A defined scope with a clear deliverable: a designed, documented, and deployed API for a specific product, partner program, or integration.

Selected work

  • E-commerce

Ease Commerce

A confidential commerce platform engagement covering storefront, integrations, and ongoing iteration. Full details are available on request.

Read case study
  • Web Development

Real-time interpreting platform

A confidential service platform engagement built for real-time scheduling and operations. Full details are available on request.

Read case study

API development FAQs

  • Because we treat the API as a product. You get a senior, founder-led team with 10+ years of software experience that designs the contract first, documents it properly, and stays accountable through deployment and support. We have covered the full lifecycle, from idea to development to deployment to support, since 2015.

Have more questions? Talk to us

Start here

Tell us about your project

Describe the systems that need to connect and who will consume the API. We will respond with a clear, honest plan for the interface layer.

100% confidential. We can sign an NDA before we talk details.