Manufacturing distributor
- Challenge
- Salesforce and NetSuite duplicated customer records.
- Simplileap solution
- Event-driven sync with mapping table and DLQ replay.
- Outcome
- Reconciliation effort down 87%.
// Build
Custom API Development
Well-designed APIs are the backbone of modern software. We design and build custom REST and GraphQL APIs that are typed, documented, versioned, and built to handle the integrations, load, and security requirements of your specific product.
// Key benefits
What makes this service valuable
OpenAPI-first design
We define API contracts in OpenAPI 3.0 before writing implementation code, enabling parallel frontend development, auto-generated client SDKs, and clear versioning contracts.
Type safety throughout
TypeScript on Node.js or Python with Pydantic, type safety from database model to API response, eliminating a class of runtime errors and simplifying maintenance.
Security baseline included
Authentication (JWT, OAuth 2.0), rate limiting, input validation, SQL injection prevention, and proper CORS configuration are baseline requirements, not optional additions.
// Details
APIs that work reliably and document themselves
A custom API is only as good as its documentation and reliability. We deliver APIs with OpenAPI 3.0 specifications, Swagger UI, automated test suites, and deployment configurations that enable confident integration by any consumer.
We choose REST or GraphQL based on your access patterns: REST for simple, resource-oriented APIs; GraphQL for complex data relationships, multiple clients with different data needs, or real-time subscriptions.
// What this includes
- OpenAPI 3.0 specification (contract-first)
- RESTful or GraphQL API design
- JWT and OAuth 2.0 authentication
- Rate limiting and quota management
- Comprehensive error handling and status codes
- Automated test suite (unit and integration)
- API documentation (Swagger UI / Redoc)
// Deliverables
What you receive
Every engagement produces clear, documented deliverables. Here is exactly what is included in our custom api development service.
- 01OpenAPI 3.0 specification
- 02Production API implementation
- 03Authentication and authorisation layer
- 04Automated test suite
- 05API documentation (Swagger UI)
- 06Deployment configuration and CI/CD
// In practice
How custom api development engagements run
We typically anchor the first sprint on openapi-first design. Well-designed APIs are the backbone of modern software. We design and build custom REST and GraphQL APIs that are typed, documented, versioned, and built to handle the integrations, load, and security requirements of your specific product. On Residency Road engagements, discovery maps dependencies and success metrics before sprint one. Architecture choices, API contracts, and observability hooks are documented before the first production deploy.
// Stack & frameworks
Stack we use for this
Frontend
- Next.js App Router
- React 18+
- Tailwind CSS
- Core Web Vitals tuning
Backend & data
- Node.js / Python APIs
- PostgreSQL
- Redis caching
- REST & GraphQL
Operations
- CI/CD pipelines
- Docker / Kubernetes
- Observability
- Security hardening
// Delivery
Simplileap execution framework
01
Architecture mapping
Dependencies, API contracts, compliance constraints, and performance budgets documented before sprint one.
02
Secure sprints
Two-week increments with GitHub access, demo recordings, and QA checkpoints, client visibility at every stage.
03
QA & handover
Automated tests on critical paths, security review, runbooks, and knowledge transfer to your team.
// Proof
Real deployments from Bangalore
Home goods wholesaler
- Challenge
- Magento migration needed B2B pricing, PO capture, and ERP sync.
- Simplileap solution
- Shopify Plus B2B, Checkout UI extensions, and webhook reconciliation.
- Outcome
- Order error rate 6% → 0.4%; ERP sync under five minutes p95.
// Engagement models
How teams engage us
Currency
| Package | Ideal for | Investment | Includes |
|---|---|---|---|
| Product MVP | Startups | ₹8L – ₹25L |
|
| E-commerce build | Retail & D2C | ₹80K – ₹15L |
|
| Mobile app (iOS / Android) | Product teams | ₹6L – ₹18L |
|
// Company and service positioning
Company and Service positioning is reviewed for production delivery standards by Harsha Parthasarathy (Co-Founder, Strategy & Operations 24+ years IT veteran, IBM, Global Delivery, Program Management) and Keshav Sharma (Co-Founder, Engineering and Lead Architect, Full-stack engineering, product delivery and technical standards).
CIN
AAU-8582
Startup India
Founded
November 2020
Office
Residency Rd, Bengaluru, India
// FAQ
Common questions about custom api development
REST or GraphQL, which is better for my use case?+
REST is simpler, more cacheable, and well-understood. GraphQL is better when multiple clients need different data shapes, when data relationships are complex, or when real-time subscriptions are needed. We recommend based on your specific access patterns and team experience.
Do you design the API or just implement it?+
Both, API design is a core part of our engagement. We work with you to define resource models, endpoint structure, and data contracts before implementation. Good API design is far cheaper to get right at the design stage.
Ready to get started with custom api development?
Share your requirements with our team. We respond within one business day with a clear plan from discovery to delivery.