API & Backend Development
Clear rules behind every request.
We define server-side business rules, data boundaries, and permissions, and connect systems through APIs and integrations. This foundation supports both new applications and software already in use.
Problems this service solves
When the underlying rules become difficult to follow.
Business logic scattered across clients
Different interfaces implement different versions of the same rule, making behavior difficult to change safely.
Integrations fail without a useful explanation
Data transfers need validation, failure handling, and a way to understand what happened.
An API that is difficult to extend
Unclear contracts, inconsistent permissions, or tightly coupled data models make each new feature harder.
Engineering approach
A contract that both sides can understand.
Access checks belong alongside the protected operation. We document API contracts and important failure modes so changes can be assessed before they reach dependent systems.
Model the rule
Identify valid data and transitions, including what must happen together.
Define the interface
Specify inputs, outputs, errors, and permission checks for each operation.
Plan for failure
Handle timeouts, repeated events, and partial work with deliberate recovery paths.
WHAT WE CAN BUILD
The server-side foundations your product needs.
Backend architecture and business logic
Server-side responsibilities, validation, and state transitions kept independent of the presentation layer.
Reliable systems start with clear boundaries.
- REST and GraphQL APIs
- Interfaces shaped by consumer needs, with consistent inputs, outputs, and error responses.
- Third-party integrations
- Service adapters, webhook endpoints, synchronization processes, and background work where appropriate. Model providers are a specialized external integration, with validated responses, timeouts and usage boundaries.
- Authentication and authorization
- Access checks alongside protected operations, with consistent permission rules for each API consumer.
- Data modeling and database integrations
- Explicit data relationships and storage boundaries, with migrations planned around existing consumers.
- Background jobs and event-driven workflows
- Webhook handlers and asynchronous work with deliberate handling of repeated events, timeouts, and partial failures.
Technologies & integrations
Tools chosen for the job.
- Node.js & TypeScript
- Typed services and integration code where they fit the runtime and existing stack.
- PHP
- Backend services and extensions for PHP environments, including WordPress integrations.
- REST & GraphQL
- Different interface choices: consumer requirements and operational complexity guide the decision.
Existing systems & ongoing development
Modernize one boundary at a time.
A backend can often improve without a complete replacement. We can isolate an integration, clarify a data model, or introduce a new API while keeping existing consumers working. Versioning and data migration are planned around those dependencies. Cloud configuration and deployment engineering can be included within the agreed project scope, with release responsibilities defined in advance.
Before we begin
Questions about API & Backend Development.
Should the API use REST or GraphQL?
REST can offer straightforward resource and operation boundaries. GraphQL can suit clients with varying data needs. We compare the consumer requirements and maintenance cost rather than choosing by fashion.
Can you integrate an undocumented system?
We first establish which interfaces are available and what can be verified safely. Missing documentation may require investigation before a dependable integration scope can be agreed.
How do you handle repeated webhook events?
Where repeated delivery is possible, handlers need to identify events or operations already processed. The exact mechanism depends on the provider and the data model.
Can the backend serve more than one frontend?
Yes. Keeping business rules and access checks on the server allows different clients to use the same defined behavior, subject to their authentication and permission requirements.
Work in context
- Drug Management
Founder professional frontend, backend, and API contributions.
- HelloBetter
Founder professional contributions to APIs, integrations, and modernization.
Work directly with the engineer
What needs to connect, change, or become clearer?
Bring the current architecture, the API consumers, and the business rules or integrations you need to support. You’ll work directly with our founder, Kerem Yılmaz Güney, on the technical decisions and implementation.