Custom API Development
Custom API Development (REST & GraphQL)
Custom API development builds the interfaces that let your apps, partners and systems exchange data securely. We design and build REST and GraphQL APIs with authentication, rate limiting, documentation and monitoring, ready for mobile apps, partner integrations and AI tools.
A well-designed API is easy for other developers to use and safe to expose. We design it carefully, document it clearly and version it so changes don't break existing users.
What we offer
- API designClear, consistent REST or GraphQL design.
- SecurityOAuth 2.0, API keys, rate limits and validation.
- DocumentationOpenAPI / Swagger docs and examples.
- PerformanceCaching, pagination and scaling.
- MonitoringUsage, errors and latency tracking.
Common use cases
- Back ends for mobile apps
- Partner and reseller APIs
- Public developer APIs
- APIs for AI agents and MCP
Business benefits
- Connect apps, partners and AI agentsthrough one secure interface
- Faster product developmentweb and mobile apps share the same back end
- New revenuefrom partner and public APIs
- Easier integrationswith clear documentation
Why work with Webtech Evolution
- 10+ years of delivery272+ projects for 118+ clients in 12+ countries since 2014.
- One team, end to enddesign, front end, back end, mobile, QA and DevOps under one roof, so nothing gets lost between vendors.
- Clear estimatesa written scope, timeline and price before work starts, and demos throughout the build.
- You own everythingcode, designs and documentation are handed over in full and covered by an NDA.
- Working hours that overlap with yoursMonday to Friday, 10:00–19:00 IST, with extended hours available for clients in the USA, Canada and New Zealand.
See it in action
How we work
Discovery
understand your goals, users, current systems and constraints.
Plan and estimate
written scope, timeline and price.
Design and build
short cycles with regular demos.
Test and launch
quality checks, security review and a smooth go-live.
Support
monitoring, fixes and improvements after launch.
Need extra developers instead? Hire developers.
Frequently asked questions
REST is simple and widely supported; GraphQL suits apps that need flexible queries. We recommend based on your clients.
Yes, with OpenAPI documentation and examples.
Yes. We can also expose it through an MCP server for AI assistants.
With OAuth 2.0 or API keys, rate limiting, input validation, encryption in transit and audit logging, following the OWASP API Security Top 10.
Let's Talk!
Have a question about Custom API Development? Send us a message and our team will reply with next steps.
- Reply within a few hours (Mon–Fri)
- NDA available
- You own the code
Prefer to talk? Call +91-9601965456WhatsApp ushello@webtech-evolution.com
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