Gradual migration from JavaScript
allowJs and checkJs first, then conversion file by file in order of risk, so the product keeps shipping and each merge leaves more of it typed.
TypeScript development company · UK
TypeScript Development Company in the UK
Work with a UK-focused TypeScript development company for faster interfaces, cleaner component systems, and conversion-ready product screens. Techsleight Labs plans, designs, builds, QA-tests, launches, and supports production software with senior engineers, weekly demos, and clear delivery ownership.
- Strategy, build, QA and launch in one team
- Fixed-price projects after discovery
- Code and IP owned by you
Capabilities
TypeScript capabilities we bring to your product.
TypeScript pays off when types describe the real shape of your data, so we test for careful domain modelling and an understanding of where compile-time checks stop.
Strict mode, switched on safely
strictNullChecks and noImplicitAny enabled one area at a time, with remaining errors counted down in CI instead of silenced with any.
Typed API contracts
Types generated from OpenAPI, end-to-end types with tRPC, or Zod schemas shared by client and server — so a renamed field fails the build, not production.
Validation at the edges
Types vanish at runtime, so request bodies, webhooks, environment variables and third-party responses are parsed with Zod before the code trusts them.
Modelling the domain
Discriminated unions for states, branded types for IDs and amounts in pence, and generics only where they make calling code simpler.
Monorepos and shared packages
pnpm workspaces, project references and Turborepo or Nx, so shared types, UI and utilities build once and version cleanly.
What we build
What we build with TypeScript.
Teams usually call for TypeScript help once a JavaScript codebase has grown faster than anyone’s ability to change it safely.
JavaScript to TypeScript conversions
A planned migration of a live Node.js or React codebase, measured by files converted and any types removed, with no feature freeze.
One set of types, front to back
Shared domain types and API schemas in a monorepo package, used by the web app, the mobile app and the API alike.
Internal SDKs and packages
Typed client libraries for your API, published privately with declaration files, changelogs and semantic versioning.
Type-safe integrations
Typed wrappers around Stripe, Xero, HubSpot or Open Banking APIs, with every incoming webhook validated before it touches your data.
Correctness-critical logic
Pricing, VAT, fees and eligibility rules modelled so invalid states cannot be represented, with property-based tests around the edges.
Tightening a loose codebase
Replacing any and unchecked casts with real types, turning on type-aware lint rules and making the compiler part of code review.
Technology stack
Technology stack.
The tools that usually sit around TypeScript in the projects we join. We fit into your stack — this is where we are most at home.
Language and tooling
TypeScript (strict)typescript-eslinttsc in CIDeclaration files
Contracts and validation
ZodOpenAPI code generationtRPCGraphQL Code Generator
Front-end frameworks
ReactNext.jsAngularVue
Server side
Node.jsNestJSFastifyPrisma or Drizzle
Monorepos
pnpm workspacesTurborepoNxProject references
Tests, including types
VitestJestPlaywrightType-level tests
Pricing
TypeScript development pricing.
Start with discovery, move to a fixed-price build, or run a dedicated team for a longer roadmap.
TypeScript discovery sprint
From £2,000
Architecture, roadmap, cost planning, and project-risk validation
- A short strategy sprint covering technical scope, user flows, delivery plan, and budget range.
Managed TypeScript development project
Fixed quote
MVPs, rebuilds, SaaS platforms, dashboards, portals, and business-critical launches
- Product planning, UX, engineering, QA, deployment, and post-launch support under one delivery owner.
Dedicated TypeScript development team
From £9,500 per month
Longer roadmaps, multi-sprint delivery, and product teams that need extra senior capacity
- A stable engineering pod with weekly demos, sprint planning, code review, and transparent reporting.
Prices are in GBP. Every estimate is confirmed in writing after a discovery call — the figures above are where engagements start, not a quote.
How we deliver
How we deliver your TypeScript project.
Seven stages, the same on every project. The length of each one changes with the work; skipping one never saves time for long.
- 01
Product and technical discovery
We map your TypeScript product goals, users, integrations, compliance needs, timeline, and commercial priorities before planning the build.
Goals, users and constraints agreed
- 02
Architecture and delivery plan
You get a practical TypeScript roadmap with milestones, team shape, risks, estimates, and the first release path.
Roadmap, team and estimate
- 03
Design, build, and QA
Our team ships the TypeScript product in controlled sprints with code review, testing, demos, and visible progress every week.
Tested software every sprint
- 04
Launch and improvement
We handle deployment, analytics, monitoring, handover, and post-launch iterations so your TypeScript platform keeps improving.
Live, monitored and documented
Why Techsleight
What working with us is actually like.
No inflated numbers — just how we run projects, and what you can hold us to.
Product engineering, not ticket-taking
We ask what the software is for before we estimate it — and we will tell you when something should not be built, or should be bought instead.
AI where it earns its place
LLM features, retrieval and automation built with evaluation, guardrails and cost controls, and plain software where that is the better answer.
Full-stack under one roof
Design, frontend, backend, mobile, cloud and QA in one team, so nothing falls between suppliers.
UK-focused delivery
UK business hours, estimates in pounds, and a contract with a UK company. Our engineers are based in the UK and India.
Flexible engagement
A fixed-scope project, dedicated developers or a monthly retainer — and you can move between them as the work changes.
You own everything
Code, IP, cloud accounts and documentation are yours from day one. We sign an NDA before discovery if you need one.
Support after launch
We stay on for fixes, upgrades and new features, or hand over cleanly to your in-house team with the documentation to match.
Relevant work
Related product work.
We do not have a published TypeScript case study yet — these show the kind of product work our engineers join.
All case studiesFinance · Analytics
Modernize
Revenue analytics dashboard with multi-source data and automated reporting.
ReactNode.jsPostgreSQLD3.js
Read the case studyRetail · eCommerce
Grocery Store
Grocery eCommerce with delivery slots, loyalty and a multi-supplier vendor portal.
Next.jsNode.jsMySQLStripe
Read the case studyTravel · Platform
Travel Ecosystem
Travel platform bringing flights, hotels, itineraries and loyalty together.
Next.jsNode.jsPostgreSQLStripe
Read the case studyFAQs
Questions we get asked.
Straight answers on scope, cost, timelines and how we work. If yours is not here, ask us directly.
What does a TypeScript development company do?
A TypeScript development company plans, designs, builds, tests, deploys, and supports TypeScript software. At Techsleight Labs, that can include discovery, architecture, UI/UX, API integration, QA, cloud deployment, analytics, and post-launch roadmap support.
Do you work with companies in the United Kingdom?
Yes. This TypeScript development company page is focused on United Kingdom businesses. We support UK collaboration with clear written updates, weekly demos, and planned handoff points so distributed teams can move quickly.
How much does TypeScript development cost?
TypeScript development pricing depends on scope, integrations, user roles, design depth, compliance needs, and launch timeline. Discovery sprints start from £2,000, dedicated teams start from £9,500/month, and managed projects are quoted after scope validation.
Can you build a complete TypeScript product, not just provide developers?
Yes. You can use Techsleight Labs as a full TypeScript development company for strategy, design, engineering, QA, deployment, and support. You can also start with a small discovery sprint before committing to the full build.
Can you improve an existing TypeScript application?
Yes. We often join existing TypeScript products to fix performance, improve architecture, add features, stabilise releases, modernise UI, or prepare the system for scale. We begin with a focused audit so the first sprint is practical.
Who owns the code and product IP?
You own the code, documentation, product IP, design assets, and infrastructure setup created for your project. We can sign an NDA before discovery and work inside your repositories, cloud accounts, and project tools.
How fast can a TypeScript development project start?
Discovery can usually begin within a few working days of the first call, and most projects start within 5–7 working days of sign-off. Larger builds usually need a short planning sprint to confirm scope, architecture, milestones, risks, and the right team before full development begins.
Do you provide post-launch TypeScript support?
Yes. After launch, we can continue with monitoring, bug fixes, performance improvements, security updates, roadmap features, analytics, and handover support. Many clients keep a monthly retainer after the main release.
Start a project
Planning a TypeScript project?
Tell us what you are building with TypeScript. We will reply within one working day with questions, a first view on approach and the next step.
What happens next
- 1A senior engineer reads your brief within one working day, and replies with questions or a first view.
- 2A 30-minute call to understand the goal, constraints and what good looks like — no sales script.
- 3A written proposal with scope, milestones, team and a GBP estimate you can take to your board.
Techsleight Labs is a trading name of Krapton IT Consultancy.
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