Data models and migrations
Design database tables, relationships and constraints around the business domain. Migration planning considers existing records, compatibility and rollback constraints rather than treating production data as disposable.
All services
04. Development
Backend & API Development
I build the backend systems that keep applications connected and consistent. From database design to APIs and background jobs, I make business rules explicit and integrations easier to operate.
The right fit
What is Backend & API Development?
Backend and API development defines how an application stores data, enforces rules and communicates with other systems. A reliable API needs more than successful requests: validation, authorization, predictable errors and recovery from partial failures are part of the contract. I design these behaviors around the workflows your product actually needs.
Who this service is for
For teams adding an API to a product, businesses connecting separate tools, and applications that need a clearer data model or more dependable processing behind the interface.
Typical projects
- APIs for web interfaces, partner integrations and internal tools.
- Webhook processing and synchronization between external services.
- Background jobs for imports, notifications and resource-intensive tasks.
From scope to handover
What’s included
The exact deliverables are agreed around your project. These are the core areas of the service.
Documented API contracts
Define request and response shapes, validation rules, pagination and error behavior. Authentication and authorization are enforced at the server boundary, with tests for important permission and input cases.
Integrations and background jobs
Implement external API calls, webhooks and asynchronous work with explicit handling for retries, duplicate events and timeouts. Secrets remain in server-side configuration, with logs designed to avoid exposing sensitive payloads.
Operational handover
Provide setup instructions, integration examples and guidance for inspecting failures. Performance work focuses on observed queries and workloads, with indexes or caching introduced where they solve a measured problem.
How we work together
Clear decisions, working increments and an agreed release scope.
- 01
Map the domain
Identify data ownership, business rules and the systems that exchange information.
- 02
Define contracts
Agree on access rules, API shapes, errors and integration responsibilities.
- 03
Implement workflows
Build the data layer, endpoints and background processing with targeted tests.
- 04
Verify failure paths
Check invalid inputs, permission boundaries, retries and operational visibility.
Tools for the job
Selected to fit your requirements and existing systems.
- TypeScript
- PostgreSQL
- Redis
- Docker
- Next.js
Plan with clarity
Budget, timing and getting started
What shapes the estimate?
Backend effort depends on the data model, authorization rules, integration quality and reliability requirements. Importing legacy data, supporting older clients or synchronizing systems adds work beyond implementing new endpoints. Expected traffic and failure tolerance inform the architecture.
What to bring to the first conversation
Bring example requests and responses, API documentation for connected systems and a description of the data you need to store. Existing database schemas, representative sample data and known failure cases make the initial review more useful.
Explore my project portfolio for examples of my work, or send your project brief to discuss the fit.
Before we begin
Backend & API Development FAQs
Can you build an API for an existing frontend?
Yes. I can work from the frontend’s required data and interactions to define the backend contract. Existing endpoints and client behavior are reviewed first so changes can be introduced without unexpectedly breaking the interface.
How do you handle authentication and permissions?
Authentication establishes who is making a request; authorization determines what that identity may do. I enforce access rules on the server and validate ownership of the requested resources. Hiding a button in the frontend is not an access control.
How do you prevent duplicate webhook processing?
Where the provider supplies stable event identifiers, processing can record those identifiers and make repeated delivery safe. Retry behavior, transaction boundaries and recovery procedures are designed for the integration rather than assuming every event arrives once and in order.
Can you improve a slow database or API?
Yes, after establishing a baseline with representative queries and requests. The cause may be inefficient queries, missing indexes, repeated network calls or excessive data transfer. I prioritize fixes based on evidence before adding caches or changing infrastructure.
Ready to start?