Software Engineering
built to last.
We design and build scalable web applications, mobile apps, APIs, and cloud infrastructure that power ambitious businesses — shipped fast, engineered to last, and fully owned by you.
Full-stack engineering capabilities
From frontend UX to cloud infrastructure — we build every layer of your product with the same rigour, craftsmanship, and long-term thinking.
Custom Web Applications
Scalable, high-performance web apps built with React, Next.js, and TypeScript — architected for enterprise scale from day one.
Mobile App Development
Native-performance iOS & Android apps with React Native or Flutter — single codebase, rapid iteration, app-store ready.
API & Microservices
RESTful and GraphQL APIs, event-driven microservices, and distributed backends engineered to handle millions of requests with zero downtime.
Cloud Infrastructure & DevOps
AWS, GCP, and Azure architecture, Kubernetes orchestration, CI/CD pipelines, and infrastructure-as-code for production-grade deployments.
Legacy System Modernisation
Migrate monoliths to modern microservices architecture — strangler pattern migration, zero downtime, full test coverage throughout.
QA & Performance Engineering
Comprehensive automated test suites, load testing, security audits, and performance optimisation — ship with confidence every sprint.
How we build software
that actually ships.
A battle-tested 5-phase engineering process refined across 150+ software deliveries — from MVP to enterprise scale.
Discovery
We map your technical landscape, identify architecture risks, and define clear functional requirements — no assumptions, no surprises.
Architecture
System design, stack selection, API contracts, and full technical specification before a single line of production code is written.
Sprint Build
Agile sprints with weekly demos, continuous integration, peer code reviews, and living documentation — full visibility at every stage.
QA & Release
Automated tests, staged rollouts, and production hardening — we deploy when it is genuinely ready, not just deadline-driven.
Scale & Support
Post-launch monitoring, feature velocity, performance tuning, and roadmap execution so your product keeps compounding in value.
Software that works across every industry
We've built production software across a dozen verticals. Each product is unique — but our engineering rigour means faster delivery and fewer surprises.
Discuss your project- Multi-tenant SaaS architecture
- Subscription billing & metering
- Self-serve onboarding & in-app analytics
- Secure payment processing integrations
- Real-time transaction ledgers
- Regulatory compliance & audit trails
- Custom storefront & checkout flows
- Inventory & order management systems
- Headless commerce architecture
- ERP & CRM custom modules
- Workflow automation dashboards
- Data visualisation & reporting portals
- HIPAA-compliant patient portals
- EHR integration & HL7/FHIR APIs
- Telemedicine platform development
- Two-sided marketplace architecture
- Matching algorithms & recommendation engines
- Dispute management & escrow systems
Real outcomes from real engagements
“KeySol took our concept from design to live product in 9 weeks. We'd been quoted 6 months by two other agencies.”
“Their code quality is exceptional. Zero regressions across 18 months of feature releases. That's rare in this industry.”
“We saved £280k compared to the London agency quote — and got a better product. KeySol is genuinely world-class.”
“Our platform processes £4M/day and hasn't had an outage since KeySol rebuilt the infrastructure 14 months ago.”
In-house vs. KeySol: see the difference.
Adjust the sliders to compare building in-house versus partnering with KeySol.
Based on typical UK market rates and 150+ project engagements. Actual results vary.
We don't just write code.
We engineer solutions.
Real engineers. Clean architecture. Full ownership — from first commit to compounding product value.
Engineers, not account managers
You work directly with the senior engineers building your product. No middlemen, no telephone-game briefs — just fast, accurate execution.
Predictable delivery
Fixed-scope sprints with clear acceptance criteria mean you always know what you're getting and when — budgets and deadlines are respected.
You own everything
Full IP transfer on every engagement. You receive source code, documentation, and deployment scripts — no lock-in, ever.
Built to last
We write tests, not just features. Every project ships with a full CI/CD pipeline, monitoring stack, and runbook so operations teams sleep at night.
Common questions
Ready to build software that
actually scales?
Book a free scoping session with one of our senior engineers. We'll review your requirements, propose an architecture approach, and give you a clear cost and timeline estimate — no obligation.