API Development Services
API development services cover designing and building the interfaces your apps, partners and internal systems depend on. We build REST or GraphQL APIs with clear contracts, sound security and documentation developers can actually use.
How we approach API development services
Poorly designed APIs create problems for years. Endpoints get named inconsistently, responses change without warning and break mobile apps, authentication is bolted on late, and documentation drifts out of date. Without rate limits and monitoring, one partner's bug can take down the system for everyone.
Our first step is agreeing the API contract with the teams who will use it, written as an OpenAPI or GraphQL schema before code. Then we build with authentication through OAuth 2.0 or API keys, input validation, rate limiting, consistent error formats and versioning. Automated tests cover each endpoint, and we set up logging and monitoring. You receive interactive documentation, example requests, a sandbox environment and the source code in your repository.
It is built for product companies building mobile or web apps, businesses opening data to partners, and teams replacing fragile point-to-point integrations.
- Working software at the end of every sprint
- Automated testing and clean documentation
- Support and improvements after launch
Working with Nians
One strategist owns your plan and brings in the specialists it needs. You hear from us every week, and every piece of work starts with an audit.
What our API Development Services include
The usual building blocks. We drop what you don’t need and add what you do.
Discovery & scoping
User stories, priorities and a realistic roadmap.
Architecture
Scalable, secure foundations chosen for your team.
Sprint-based development
Working software every two weeks.
QA & testing
Automated and manual testing before every release.
DevOps & deployment
CI/CD, monitoring and cloud infrastructure.
Support & evolution
SLAs, fixes and new features after launch.
How we deliver
You see the plan before any work starts.
Discovery
User stories, priorities and a realistic first release.
Architecture
Technology choices that suit your team and your scale.
Sprints
Working software every two weeks, demoed to you.
QA
Automated and manual testing before each release.
Maintain
Monitoring, updates and a clear handover if your team takes over.
You may also be interested in
Who usually asks for it
Case studies & resources
Real-world results and practical reading to help you plan your next step.
Client stories
How similar work has played out for other businesses.
Helpful resources
Guides, tools and articles our team recommends on this topic.
Questions we often hear
Straight answers to the things clients ask us most. If yours isn’t here, just ask.
Should I choose REST or GraphQL?
How do you secure an API?
Can you take over an existing project?
Let’s plan your next stage of growth.
A free 30-minute session with a senior Nians strategist. You leave with a prioritised plan, whether or not you work with us.