Software Development
API Development, API Integration and Backend Development
We handle API development, API integration and backend development, so your applications, partners and data sources work as one system.
- One source of truth across systems
- Documented, versioned APIs
- Integrations that survive failures
- A backend ready for web, mobile and partners
Overview
Most software problems that look like product problems are integration problems underneath. Orders that do not reach the warehouse, customer records that differ between systems, a mobile app that slows down because the backend was never designed for it. A well designed API is what keeps separate systems in agreement.
An integration is only finished when it handles the bad days: duplicate events, timeouts, partial failures and a provider that changes its format.
Capabilities
What we build
REST APIs
Well structured, documented APIs for your web application, mobile app and partners.
Third-party integrations
Connections to payment, CRM, ERP, messaging, email and commerce platforms.
Webhooks and events
Verified, idempotent event handling so data stays correct when events repeat or arrive late.
Legacy system connectors
A modern interface in front of older systems that cannot be replaced yet.
Background jobs and queues
Reliable processing for imports, exports, notifications and scheduled work.
Authentication and access
API keys, OAuth and scoped access so each client reaches only what it should.
Why Dude Lemon
Why teams choose us for API work
We build and operate APIs for our own products, which process messages, orders and payments from several outside platforms. We know where integrations fail in practice, and we design for those failures from the first version.
System integration that does not break
Third-party systems send events twice, time out, and occasionally go down. An integration that assumes everything works will lose or duplicate data the first time something goes wrong. We verify every incoming webhook, make each operation safe to repeat, queue work that can be retried, and log enough to trace any record from one system to the other.
How we work
A clear path from idea to production.
Map the systems
We document the systems involved, the data each one owns and where they must agree.
.01Design the contract
We define resources, events, errors and authentication, and review the design with the teams who will use it.
.02Build and test
We build the API or integration with automated tests, including the failure cases.
.03Document and release
We publish documentation and examples, then release behind monitoring and alerts.
.04Operate
We watch error rates and provider changes, and keep the integration healthy on a retainer.
.05Node.js and TypeScript, REST and webhooks, OAuth and API keys, PostgreSQL, Queues and background jobs, OpenAPI documentation, Monitoring
Engagement and pricing
Custom pricing, based on project scope.
Every project is scoped individually. After a short discovery call you receive a clear written estimate, with no obligation. The engagement types below show how we usually structure the work.
Single integration
One system connected reliably to your product.
- Verified webhooks
- Retry and error handling
- Monitoring
API platform
A documented API for your apps and partners.
- Resource and contract design
- Authentication and rate limits
- Documentation and examples
- Automated tests
Ongoing integration work
A team that maintains and extends your integrations.
- New connectors
- Provider change tracking
- Support and on-call
API Development and Integrations FAQ
Frequently asked questions.
Anything we have not answered here, ask us directly. A senior engineer replies.
Contact usWhat kinds of systems can you integrate?
Payment providers, CRMs, ERPs, commerce platforms, messaging and email services, identity providers and custom internal systems. If a system exposes an API, files or a database, we can usually connect it.
Can you connect an old system that has no API?
Often, yes. We can place a modern interface in front of a legacy system by working with its database, file exports or existing interfaces, so other software can use it without changing the old system.
Do you document the APIs you build?
Yes. Every API ships with reference documentation, examples and clear error descriptions, so your developers and partners can build against it on their own.
How do you keep integrations reliable?
We verify incoming events, make operations safe to repeat, queue and retry failed work, and monitor error rates. When a provider has an outage, work is held and processed when it returns.
Can you build the backend for our mobile app?
Yes. We build the APIs, authentication and data layer mobile apps depend on, and we also build the apps themselves. See our mobile app development service.
Let us scope your api development and integrations project.
Book a free discovery call. You will hear from a senior engineer, not a sales rep, with a clear view of scope, timeline, and cost within two business days.