Custom software built to fit your exact requirements — from internal CLI tools to full-stack SaaS platforms — delivered with production-grade quality and maintainability.
8 wks
idea to production deployment
15+
production systems delivered
4
languages: Go, Rust, TS, Python
80%+
test coverage as standard
Off-the-shelf tools solve 80% of most problems. The remaining 20% — the part that's actually specific to your business, your data model, your compliance requirements — is where bespoke software pays for itself. ICF builds that last 20% to the same quality bar as the first: readable code, comprehensive tests, clear documentation, and a handoff your team can actually maintain.
We favour Go for backend services and CLIs (fast compilation, single binary, excellent concurrency), TypeScript for web frontends and Node.js APIs, and Rust for anything where performance or memory safety is non-negotiable. The language is chosen based on your constraints, not ours.
User stories, data model, API contract, and technology choices agreed in writing before any code is written. No surprises mid-build.
Tests written alongside code. Weekly demo of working software, not status updates. You see real progress, not PowerPoint.
Every PR reviewed for correctness, readability, and security. Static analysis, linting, and dependency scanning in CI from day one.
Production deployment, observability setup, and a defined handoff period so your team is confident operating what we've built.
You've outgrown a SaaS tool and need something that fits your data model
When the spreadsheet hacks and Zapier automations are becoming a second engineering project, custom software is cheaper than the ongoing workarounds.
Your team needs internal tooling that doesn't exist off the shelf
CLI tools for environment management, internal admin UIs, migration scripts, automation bots — the kind of internal software that multiplies engineering productivity.
You need a backend API for a mobile app or third-party integration
A well-designed REST or gRPC API with OpenAPI documentation is the foundation that keeps your mobile team, web team, and partners all moving independently.
You have a performance bottleneck that business logic rewrites can't fix
When algorithmic optimisation is exhausted and you need 10× throughput, Rust provides the performance of C with the safety and modern tooling of a contemporary language.
Share what you're building, the technical constraints, and the timeline. We'll scope an engagement and propose an architecture in one call.