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
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
Leet Force didn't just build us a product — they transformed our entire digital presence. The attention to detail is unmatched. Every interaction feels premium.
Ayesha Nadeem
CEO, Rawal Capital
Our new site won Site of the Day on Awwwards within weeks of launch. Leet Force understands what 'premium' actually means.
Bilal Ahmed
Founder, Margalla Creative
They navigated complex healthcare requirements with ease while delivering a beautiful, intuitive platform our patients love.
Dr. Sana Qureshi
Chief Medical Officer, Chenab Health
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.