Custom APIs
REST and GraphQL APIs with authentication, rate limiting, versioning, and documentation your partners can build against.
API Development & Integrations
APIs and integrations that stop the manual work
Make every tool in your stack talk to each other.
We build custom APIs and connect the systems you already pay for — CRMs, ERPs, payment providers, and legacy databases — so data moves without anyone copying it between tabs.
- Fixed scope & price
- Agreed before any code is written
- You own everything
- Code, infrastructure, and documentation
- Europe & MENA
- Overlapping hours, async written updates
The problem
Your systems do not talk, so your people do it manually
Someone exports a CSV from the CRM every Monday and imports it into the ERP. Orders are re-keyed. Two systems disagree about the same customer, and finance reconciles the difference by hand at month end.
- Staff re-enter the same data into more than one system
- Reports disagree depending on which system produced them
- An integration built years ago fails silently and nobody notices for days
- A vendor's API changed and something broke that no one can fix
- Growth is limited by how much manual data entry your team can absorb
What we build
What we actually build
Either the API your own systems need to expose, or the integration layer between tools that were never designed to work together — with monitoring, so failures surface immediately instead of quietly.
Third-party integrations
Stripe, Salesforce, HubSpot, SAP, and the rest — connected with proper error handling instead of a fragile script on someone's laptop.
Legacy system bridges
Modern API layers in front of older databases and on-premise software, so new tools can reach data currently locked away.
Automation workflows
Event-driven processes that move data and trigger actions between systems without a human in the loop.
Capabilities
What is included as standard
- Contract-first REST and GraphQL design
- OAuth, API keys, and scoped permissions
- Webhook delivery with retries and replay
- Idempotency and duplicate protection
- Rate limiting and quota management
- OpenAPI documentation
- Data mapping and transformation
- Monitoring, alerting, and failure recovery
When companies call us
Typical situations we are brought into
CRM and ERP are out of sync
Sales and operations work from different numbers because customer and order data lives in two systems that never reconcile.
Payments need to reach finance
Stripe or a local payment provider needs to flow into invoicing and accounting without a monthly manual reconciliation.
You need to expose an API to partners
Customers or resellers want programmatic access to your platform, and you need it secure, documented, and versioned.
A critical integration keeps breaking
Something built quickly years ago now fails regularly, and each failure costs a day of someone's week to unpick.
Technology
The stack we build on
API
- REST
- GraphQL
- OpenAPI
- gRPC
Runtime
- Node.js
- TypeScript
- Python
- Serverless
Data
- PostgreSQL
- Redis
- Message queues
- ETL pipelines
Operations
- Datadog
- Sentry
- Retry queues
- Audit logging
Process
How the engagement runs
- 01
Discovery & scope
We map your current systems, constraints, and commercial goals, then agree what is in scope — and what deliberately is not.
- 02
Architecture & plan
You get a technical approach, milestone plan, and fixed commercial terms before any code is written.
- 03
Build in increments
Two-week increments with working software at the end of each. You review real builds, not status decks.
- 04
Launch & handover
Testing, migration, and documented handover so your team can operate the system without depending on us.
- 05
Ongoing partnership
Support, iteration, and a named engineer who already knows your stack when the next thing comes up.
Related work
Projects in this space
Further reading
What we’ve written about this
Integrations
Tools we connect to regularly
Not an exhaustive list — if it exposes an API, we have probably worked with something like it.
StripeSalesforceHubSpotSAPMicrosoft DynamicsXeroShopifyZapierTwilioQuickBooks
Questions
What buyers usually ask
A single well-defined integration typically runs €6,000–€20,000. A full API platform or multi-system integration layer is usually €25,000–€75,000. Cost is driven mostly by how cooperative the systems on each end are.
Clients
What working with us is like
We were losing patients at the booking stage and could not work out why. The front desk answered what it could and everything else went to voicemail at exactly the hour people call. Leet Force did not start by building anything, they spent the first week in our phone logs. Booking abandonment fell 65% once patients could see real availability and book without waiting for anyone. Eighteen months on they still maintain it, and I have never once had to chase them for an update.
Founder & CEO
65% fewer abandoned bookings, Private healthcare group, Pakistan
We were losing patients at the booking stage and could not work out why. The front desk answered what it could and the rest went to voicemail at exactly the hour people call. Leet Force did not start by building anything. They spent the first week in our phone logs. Booking abandonment fell 65% once patients could see real availability and book without waiting for anyone. The part I did not expect was how much calmer the mornings became.
Operations lead
65% fewer abandoned bookings, Private healthcare group, Pakistan
Opening an account took eleven minutes and most people gave up. Two agencies had already told us it was a design problem. It was not, it was four systems that refused to talk to each other, and Leet Force were the first people to actually say so. They rebuilt the flow around that and onboarding came out two and a half times faster. They also talked us out of two features we were certain we needed, which saved us more than the project cost. I have worked with a lot of agencies and almost none of them will argue with you.
Co-founder & CTO
2.5x faster onboarding, Fintech, Gulf region
Related services
What usually comes with this
Which manual process should stop existing?
Tell us the workflow your team repeats every week. We will scope what it takes to automate it and what it would save.