Hire the Best Freelance API Developers

An API developer designs, builds, documents, tests, and maintains application programming interfaces that let software systems communicate reliably. This can include REST or GraphQL API design, authentication, database connections, third-party integrations, performance optimisation, versioning, and security controls. At Capital Compute, API work is handled by senior backend engineers using technologies such as Node.js, Express.js, NestJS, GraphQL, AWS, and DynamoDB.

Capital Compute provides dedicated backend and API development expertise through its internal engineering team, with no subcontracting. Depending on the project, developers may work with Node.js, Express.js, NestJS, GraphQL, AWS Lambda, DynamoDB, RDS, authentication services, databases, and secure integration patterns. The focus is on scalable, documented, versioned APIs that your internal team or future development partner can maintain after handover.

Capital Compute’s model is designed for UK businesses that want senior engineering support without unmanaged outsourcing risk. Engagements are scoped upfront, priced on a fixed-scope basis where applicable, and reviewed through milestone or sprint approval gates. You retain full control of the source code, technical documentation, and handover materials, helping prevent vendor lock-in after the project is complete.

Yes. API developers can build secure third-party integrations, internal system connections, CRM integrations, automation workflows, payment or data APIs, and backend services for SaaS platforms. Capital Compute also supports documented, versioned APIs intended for long-term maintenance by client-side teams. The discovery stage helps clarify endpoints, authentication, data flows, compliance needs, and the systems involved before development begins.

Pricing is based on the agreed scope rather than vague hourly estimates where a fixed-scope project is appropriate. Capital Compute conducts a structured discovery process to understand requirements, technical constraints, integrations, and business goals before providing a scoped estimate. For ongoing needs, flexible sprint-by-sprint retainers may be used, with no long-term lock-in and clear review points.

Capital Compute builds GDPR compliance into architecture from the start, especially for UK regulated sector clients. API security may include strong authentication, role-based access controls, encrypted data handling, input validation, audit-friendly logging, secure cloud design, and careful data boundary planning. The goal is to reduce regulatory risk before launch rather than treating compliance as a late-stage review.

Yes. Clients receive full ownership of the source code, technical documentation, and a complete handover package when the project closes. Capital Compute’s approach is intentionally designed to avoid ongoing dependency. APIs are documented and versioned so your internal team or another future development partner can maintain, extend, or integrate with the system confidently.

Capital Compute works with UK business hours for sprint reviews, making collaboration easier for UK teams. Working hours are Monday to Friday, 11AM–8PM, with weekends closed. Project timelines depend on scope, but the delivery model includes structured milestone reviews, client approval gates, and upfront planning to keep communication clear throughout development.