API Development & Integration
Most useful software is connected software. We design and build APIs, integrate third-party services, and move data between systems — the connective work that rarely appears in screenshots but decides whether your tools cooperate or fight each other.
What we do
Three kinds of work make up this service. First, internal APIs: REST or GraphQL services that expose your data and business logic to your own frontends, mobile apps, and partners, built in Node.js (NestJS), Python, Go, Java, or .NET depending on your environment. Second, third-party integrations: connecting your systems to payment providers, CRMs, ERPs, accounting platforms, email and messaging services, and the long tail of vendor APIs that modern businesses depend on. Third, data migrations: moving data between databases or platforms without losing or corrupting it.
The common thread is that this work punishes carelessness. Contracts, versioning, authentication, rate limits, retries, and idempotency are where integrations quietly go wrong, so those are the things we design first rather than patch later.
In scope
- Internal REST and GraphQL APIs with documentation and versioning
- Third-party integrations: payments, CRM, ERP, logistics, messaging
- Webhook processing, queues, and event-driven synchronization
- Database and platform migrations with verification at every step
How we work
Integration projects fail on unknowns — undocumented vendor behaviour, dirty legacy data — so our process is built around surfacing those early.
1. Interface mapping
We inventory the systems involved, read the vendor documentation with due suspicion, and prototype the riskiest connection first.
2. Contract design
API schemas, error semantics, and versioning strategy are agreed and written down before implementation, so consumers can build in parallel.
3. Build and test against reality
We test against sandbox and real environments, not just mocks, and handle the failure modes vendors do not advertise: timeouts, partial responses, silent format changes.
4. Migrate and verify
For migrations: dry runs on copies, reconciliation counts and checksums, a rollback plan, and a cutover scheduled around your business — never a hopeful weekend script.
What you get
APIs are products for developers, so the deliverables are developer-shaped.
Working integration or API
Deployed, monitored, and handling errors gracefully — not just the happy path.
API documentation
OpenAPI/GraphQL schemas and usage documentation your team and partners can build against.
Migration report
For data migrations: reconciliation results showing what moved, what was transformed, and what was excluded and why.
Monitoring and alerts
Visibility into failures, so a broken integration is noticed by you before your customers.
Typical engagements
Typical projects in this area include:
Vendor integration
Connecting your product to a payment provider, CRM, or ERP, including webhooks and reconciliation.
API for partners
A documented, versioned public API so partners can integrate with you instead of emailing spreadsheets.
Platform migration
Moving data from a legacy system or departing vendor into your new platform, verified end to end.
Frequently asked questions
REST or GraphQL?
It depends on the consumers. REST remains the sensible default for public and partner APIs; GraphQL earns its complexity when many frontends need flexible views of the same data. We recommend one based on your case and are comfortable maintaining either.
Can you integrate with our legacy or niche systems?
Usually. We have worked against old SOAP services, CSV-over-SFTP exchanges, and vendor APIs with sparse documentation. The interface mapping step exists precisely to find out early what a legacy system will tolerate.
How do you keep data migrations safe?
Dry runs on copies of production data, automated reconciliation of record counts and checksums, a rehearsed rollback plan, and a cutover window agreed with you. The migration is done when the numbers reconcile, not when the script exits.
Do you maintain integrations after delivery?
Yes. Vendor APIs change and deprecate, so integrations benefit from light ongoing attention. This is typically folded into a maintenance and support retainer.
Sounds like your project?
Tell us what you need and we’ll reply with a clear next step: questions we’d ask, a rough scope, and an honest view of whether we’re the right fit.
Other services
- Web Application Development
Custom web application development for companies worldwide: SaaS products, client portals, and internal dashboards built with Next.js, React, and Node.js.
- Mobile App Development
Cross-platform and native mobile app development for clients worldwide: React Native, Flutter, Swift, and Kotlin, including store submission and maintenance.
- Maintenance & Support
Ongoing software maintenance for businesses worldwide: monitoring, dependency updates, security patches, and small improvements under a clear monthly retainer.
- Bug Fixing & Codebase Rescue
We take over troubled, inherited, and AI-generated codebases for companies worldwide: audit, stabilize, and maintain — with honest quoting at each step.
- UI/UX & Frontend Modernization
Frontend modernization for products worldwide: interface redesigns, web performance, accessibility improvements, and responsive fixes — without a risky rewrite.