API Development Services

Custom REST APIs built to connect your systems and move data reliably.

Your business runs on data moving between systems. When that movement is slow, broken, or manual, everything downstream suffers. We build APIs that make your software talk to each other the way your business actually works, not the way a generic integration assumes it does.

Laravel Node.js PHP MySQL PostgreSQL REST API JWT Docker AWS

Start Your Project

Free consultation · 24hr response

Trusted by companies across the USA

The SIR Group

API Development for Your Business

A healthcare staffing company came to us with a problem most people would call a tech problem but was really a revenue problem. Their scheduling platform, their payroll system, and their client portal all held overlapping data, and none of it synced automatically. Staff were copy-pasting shift records into three places every morning. By the time we finished building a central REST API layer connecting all three systems with JWT-authenticated endpoints, they had cut that daily reconciliation work from two hours to under five minutes.

That is what API development actually does at its best. It is not about adding a feature. It is about removing the friction that sits between your tools, your teams, and your customers. Whether you need a public-facing API for a partner integration, an internal API connecting your ERP to your mobile app, or a third-party API connection to Stripe, Salesforce, or a logistics provider, the underlying challenge is always the same: making sure data gets to where it needs to go, reliably, securely, and at the speed your users expect.

We have been building APIs since 2015, across industries from logistics and fintech to healthcare and e-commerce. Our work covers everything from lightweight microservices on Node.js to complex multi-system orchestration layers built in Laravel with PostgreSQL backends. We work entirely remotely with US-based businesses, and our team is structured so you get progress while you sleep and a clear update waiting when you start your day.

Why Choose API Development

Working Endpoints, Not Working Documents

You get tested, documented API endpoints in each sprint, not a design document that sits in review for weeks. You can connect your frontend or a third-party tool the day a sprint closes.

Security Baked In From Day One

JWT authentication, rate limiting, input validation, and HTTPS enforcement are part of the base build, not retrofitted later. An API that leaks data or gets abused at 3am is worse than no API at all.

Documentation Your Team Can Actually Use

Every API we ship includes structured documentation your developers and partners can follow without calling us. We use OpenAPI/Swagger specs so your team is never guessing about an endpoint's expected input.

Built to Handle Real Load

We provision APIs on AWS with load balancing and containerized deployments via Docker, so a traffic spike from a product launch or a heavy batch job does not take your integration down.

Third-Party Integrations Done Right

Connecting to Stripe, QuickBooks, Twilio, Shopify, or any other platform with an API means handling their quirks, rate limits, and error formats. We have done enough of these to know where they break.

Fixed-Price, No Scope Creep Surprises

Every API project is quoted with a fixed price based on a documented scope. If requirements change, we discuss it openly before any work shifts, so you never get an invoice that blindsides you.

Our API Development Services

REST API Design and Development

We design resource-based REST APIs that follow consistent conventions your team and partners can understand without a manual. Built on Laravel or Node.js depending on your performance and infrastructure needs.

Third-Party API Integration

We connect your platform to payment processors, CRMs, ERPs, shipping carriers, and marketing tools via their APIs. We handle authentication flows, webhook listeners, and error recovery so the connection stays stable.

Mobile and Web App API Backends

Your mobile app or web frontend needs a reliable data layer behind it. We build API backends that serve structured data, manage authentication, and handle business logic cleanly separate from your UI layer.

API Deployment and Infrastructure

We deploy APIs on AWS using Docker containers and configure environment-specific staging and production setups. Your API gets proper monitoring and health checks from launch day.

API Authentication and Security

JWT token systems, OAuth2 flows, API key management, and role-based access control are not optional add-ons. We build them into the architecture before writing business logic.

API Maintenance and Versioning

APIs change as your product grows. We manage versioning so existing integrations keep working when you release new endpoints, and we monitor for errors before your users report them.

How We Deliver API Development Projects

No 47-slide proposal deck. No three-month discovery phase. Here is how a project moves from your idea to working software.

Start Your Project
1

Discovery & Planning

We spend the first phase understanding your data flows before writing a single endpoint. That means reviewing your existing systems, walking through integration requirements on a call, and documenting exactly what each API consumer needs. If you have existing APIs that need to be replaced or extended, we audit those first so we do not rebuild something that was already working fine.

2

UI/UX Design

For APIs, this phase is about contract design: the structure of your requests and responses, error codes, authentication flows, and the developer experience for whoever consumes the API. If your API has an admin portal or a developer documentation site, we design those interfaces here with the same attention we give any user-facing product.

3

Development

We build in focused sprints with endpoints grouped by feature area. You get access to a staging environment from the first sprint so your frontend team or integration partners can start testing before the full build is finished. We choose Laravel for complex business logic with relational data structures and Node.js when the primary requirement is high concurrency or real-time throughput.

4

Testing & QA

Every endpoint gets tested against expected inputs, malformed inputs, and edge cases like empty arrays and null values. We run load tests for any endpoint that will see significant traffic so you know its breaking point before it breaks in production.

5

Launch

We deploy to your production environment on AWS, configure monitoring and alerting, and hand over the OpenAPI documentation and all deployment scripts. You own every file, every credential, and every configuration from day one.

6

Support & Growth

After launch, we offer a support retainer that covers bug fixes, version updates, and new endpoint additions. Most clients come back within 60 to 90 days needing one or two new integrations as their product grows, and having us already familiar with the codebase makes those additions fast.

Why Choose Aneri Developers

Your API Gets Built While You Sleep

Our team is based in India, which means our workday runs while most of the US is offline. You send a question at 5pm Eastern and wake up to an answer, a commit, or a working endpoint. The time difference is a real productivity advantage on build-heavy projects.

Same Engineers, Start to Finish

The developers who scope your API are the same ones who build and ship it. We do not hand projects off to a junior team after kickoff. That continuity matters when an integration has edge cases that only make sense if you understand the original architecture.

Operating Since 2015

We have been building custom software for over a decade, with 500+ projects delivered for clients across more than 20 countries. That includes API work for companies ranging from early-stage startups to mid-market businesses with complex multi-system environments.

You Own Everything

All source code, database schemas, documentation, and deployment configurations belong to you the moment they are written. We sign an NDA and a contract before any work starts, and we do not retain any rights to what we build.

Communication That Actually Works Remotely

We run projects through Slack for day-to-day communication, Zoom for milestone reviews, and Loom for async demos when a screen recording explains something better than a message. Every sprint closes with a recorded walkthrough you can share with your team.

A Small Team With No Silos

With roughly 10 engineers, every person on your project knows the full scope. There is no account manager sitting between you and the developer. When you have a technical question, you get a technical answer.

Frequently Asked Questions

Common questions about api development.

REST APIs are the right choice for the vast majority of business applications because they are stateless, easy to document, and understood by every frontend and mobile framework in common use today. GraphQL is worth considering if your frontend team needs to query deeply nested data with variable shapes, but for most transactional systems, REST is simpler to build, secure, and maintain. We will tell you honestly if we think GraphQL fits your use case better.

Every API we build uses JWT-based authentication for stateless token verification, HTTPS enforcement, and input validation on every endpoint. For APIs handling financial or health data, we add rate limiting and IP allowlisting as a baseline. Security is not a checklist item at the end; it shapes the architecture from the first design decision.

Yes, and we have done enough of these to know where each platform's API behaves unexpectedly. Stripe webhooks, for example, require idempotency handling to avoid double-charging on retried events. QuickBooks Online has specific OAuth2 token refresh behavior that trips up a lot of first-time integrations. We account for those things from the start rather than discovering them after go-live.

It depends entirely on scope. A focused API connecting two internal systems might be a few thousand dollars. A full API platform with authentication, multiple integrations, admin tooling, and documentation can be ten times that. We quote everything at a fixed price after a discovery call where we document exactly what needs to be built, so you know the number before any work starts.

A straightforward REST API with 10 to 20 endpoints typically takes 4 to 6 weeks from kickoff to production. More complex projects with multiple third-party integrations, custom authentication flows, or high-volume data pipelines run 8 to 14 weeks. We give you a specific timeline during scoping, and that timeline accounts for testing and documentation, not just writing the code.

Not if the process is set up correctly, and ours is. We overlap with US business hours for calls and sprint reviews, use Slack for same-day responses, and close every sprint with a Loom walkthrough so you can review progress on your own schedule. Most clients tell us the async model actually reduces the interruptions that slow down faster moving projects.

You own the code outright. We transfer full repository access, remove our own access credentials, and hand over all deployment scripts and configuration files. The only way we touch your API after that is if you engage us for a support retainer, and that is entirely your call.

We build versioning into the URL structure from day one, typically with a v1 prefix on all routes. When new requirements come in that would change an existing contract, we add a v2 endpoint alongside the original rather than modifying it. That way, existing consumers keep working while new integrations use the updated version.

Tell Us What Your Systems Need to Share

Send us a description of the integration or API you need built and we will come back with a clear scope and a fixed price, no ambiguity about what you are getting.

Free Consultation
No Commitment
NDA on Day One

Describe Your Project

Include as much detail as you want. We typically reply within 24 hours.

Get a Quote WhatsApp Meeting Email Us
Get a Quote WhatsApp Schedule a Meeting Email Us