RejoiceHub services
API Development
Build and document APIs that connect applications and business systems, with authentication, validation, and clear error handling.
Scope, milestones, and responsibilities agreed before the build.
How we work
From the first question to working software
Capabilities
What we can build with you
Choose the work your project needs. We define the details and dependencies together.
API design
Define endpoints, request and response shapes, permissions, and versioning.
System integration
Connect services with webhooks, background jobs, retries, and data validation.
Testing and documentation
Test the API contract and document how to authenticate, send requests, and handle failures.
Delivery process
From scope to launch
Review the work at each stage, with clear responsibilities for delivery and handover.
Discover
Map the current workflow, users, systems, and constraints.
Design
Agree the data flow, user journeys, permissions, and acceptance criteria.
Build
Implement the agreed scope in increments the team can review.
Test
Check the main tasks, failures, access controls, and agreed performance requirements.
Launch
Prepare deployment, monitoring, documentation, and support responsibilities.
Project planning
Agree the work before the build
We review the current workflow and define what the project will deliver.
What we review
The current workflow
Identify the tasks, handoffs, and exceptions that the project needs to address.
Data and system access
Review the information and integrations available, including permissions and constraints.
Delivery requirements
Agree the users, acceptance criteria, timeline, and responsibilities for operating the result.
What you receive
An agreed scope
A definition of the work, dependencies, deliverables, and estimate.
Work your team can review
Designs and working increments checked against the agreed requirements.
A plan for operation
Deployment, documentation, monitoring, and support responsibilities included in the handover.
Technology
A stack that fits your systems
We choose tools around your requirements, existing systems, and operating constraints.
- Architecture
- REST APIs
- Query Language
- GraphQL
- Backend
- Node.js
- Development
- Python
- Infrastructure
- AWS/Azure
Scope-based engagement
Start with a defined piece of work
Start with a paid diagnostic or a fixed-scope sprint. We agree the deliverables, dependencies, and estimate before work starts.
Agreed before work starts
- Requirements and acceptance criteria
- Milestones and review points
- Documentation and handover responsibilities
Working with us
Who builds it, and how we work
- Who works on it?
- People from a team of 100+ across payroll and contract engagement, staffed to what your project needs.
- AI engineers
- Software developers
- UI/UX designers
- QA engineers
- Delivery leads
- How is the team set up?
- Design, build and support sit in one team, so the work does not stop at a handover between vendors. Every release goes through code review, testing and a security pass before it reaches production.
- Where are you, and who do you work with?
- Our office is in Surat, India, and we work with clients across five countries. We sign an NDA before you share anything sensitive, if you need one.
- USA
- Canada
- Norway
- Hong Kong
- India
- How soon can we start?
- With a time-boxed diagnostic. Fixed-scope sprints are agreed before the first build starts, so you know what each stage delivers before you commit to it.
FAQs
Questions about the engagement
Common questions about api development, answered.
Share the task, current systems, and constraints. We will review the requirements and agree the scope of the first stage.
We review the interfaces, data access, and permissions your systems provide. Integration work and any required changes are included in the scope.
They depend on the features, integrations, data, and review requirements. We provide an estimate for the agreed scope before work starts.
We define access permissions and review steps with your team. Requirements for sensitive data, hosting, and retention are part of the project scope.
We agree who operates the system, what documentation is needed, and the support and maintenance arrangements before handover.
Discuss your requirements
Discuss your API Development project
Reliable REST APIs
Scope and estimate agreed after reviewing your requirements