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Hire TypeScript developers who leave the codebase easier to change

Add a TypeScript engineer to your team for a defined piece of work: typing a JavaScript codebase that has become risky to change, building a new one properly, or holding the type layer while your own developers ship features.

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What they do

Hire TypeScript developers who leave the codebase easier to change, end to end.

Typed React and Next.js front ends

Props, state and API responses typed properly, so a rename fails at compile time instead of in a customer's browser. Discriminated unions for states that should never overlap, and no quiet any left at the edges.

Node and Express APIs in TypeScript

Request and response shapes defined once and checked at the boundary, so bad input is rejected before it reaches your logic. Errors, auth results and database rows typed rather than assumed.

Moving a JavaScript codebase to TypeScript

Incremental adoption, file by file, with the build green the whole way. We start where the bugs are, not at the top of the folder tree, and we agree the strictness you want to end up at before we begin.

Shared types across front end and back end

One source of truth for the shapes that cross the wire, generated from your schema wherever one exists. When the API changes, the front end stops compiling, which is exactly when you want to find out.

Types for CMS and commerce data

Webflow CMS, Strapi and Shopify data typed at the point it enters your app, so a renamed field or a missing image is caught in the build rather than on a live page in front of a customer.

Strict mode, linting and a CI gate

A tsconfig you can defend, lint rules the team has agreed to, and a type check that runs on every pull request. Types only stay useful if something actually fails when they are wrong.

How it runs

Plan. Build. Run.

01

A 30 minute call

You describe the codebase, the team and what is slowing you down. We say whether a TypeScript engineer is the right answer and where we would start. If it is not the right answer, we will tell you that.

02

Fixed scope, timeline and price

We write down what will be typed, what will not, and what done looks like. You get one number and one date before any work starts. Change requests are scoped and priced separately, in writing.

03

We build inside your process

Your repository, your branch rules, your review standards. Work arrives as pull requests your own developers read, so nothing lands that your team has not seen and understood first.

04

Handover, or we run it

At the end you get documentation and a walkthrough for your team. If you would rather not carry it, the monthly retainer keeps us monitoring, fixing and improving the work after it ships.

Why infoloop

We do not hand over and leave.

  • We build, and then we runMost agencies hand over and leave. We offer a monthly retainer after launch: monitoring, fixes against agreed response targets, improvements, security updates and a written report every month.
  • Types written for the next readerAnyone can satisfy the compiler. We write types that describe the domain, so the developer who opens the file in a year can see the rules without having to ask someone who has left.
  • Fixed scope, not an hourly meterYou agree a scope and a price before work starts, so the cost does not move because a task took longer than someone guessed. There are no open-ended timesheets to audit at month end.
  • Your repo, your standardsWe adopt your conventions rather than importing ours. If your team dislikes a pattern, it does not go in, and every change arrives as a pull request one of your developers approves.
  • One team across the whole stackWe build AI agents, websites, stores and headless CMS work, so a TypeScript engineer here can follow a type from a Strapi field through the API to the page it finally renders on.

What you get

Every engagement includes these, in writing, before work starts.

  • A strict tsconfig, with a written reason for every rule we relaxed.
  • Typed API boundaries, checked at runtime where outside data enters.
  • Types generated from your schema, so they cannot drift from the source.
  • A type check in CI that fails the pull request before it can merge.
  • Handover notes and a walkthrough recording for your own developers.
  • A rollback plan for anything we put in front of your customers.

Who this is for

Three situations where this is the right call.

A JavaScript codebase nobody wants to touch

Every change breaks something two files away, so the team stops refactoring and starts working around the problem instead. Typing the hot paths and the data boundaries first removes the fear in the places that are costing you the most.

A small team shipping faster than it reviews

Two or three developers moving quickly, nobody owning the type layer, and conventions drifting one person at a time. An engineer whose job is the boundaries keeps that from turning into next year's rewrite.

A new product where the schema changes weekly

Early on the data model moves every sprint. Shared types generated from the schema mean a change breaks the build the same afternoon, instead of surfacing as a blank screen in a demo two weeks later.

Questions

What buyers ask us first.

What does it cost to hire a TypeScript developer through infoloop?
We do not quote a day rate on a web page, because the number would be meaningless without the scope. You start with a 30 minute call, we agree what will be built or typed, and you get a fixed scope, timeline and price in writing before any work begins. Change requests are scoped and priced separately, so the figure you approve is the figure you pay. If you want us to keep the work running after it ships, that is a separate monthly retainer, sized to what we look after.
Can your engineer work inside our existing team and repository?
Yes, and that is the usual shape of this engagement. We work in your repository, follow your branch and review rules, and deliver in pull requests your own developers read and approve. We join the stand-ups and channels you want us in and stay out of the ones you do not. Nothing merges that your team has not seen. If you would rather we build a separate service or package and hand it over complete, we can do that instead, but by default your developers stay in control of what lands.
Do we have to rewrite our JavaScript codebase to adopt TypeScript?
No, and we would advise against trying. TypeScript is designed to be adopted incrementally: JavaScript and TypeScript files sit in the same project, and you tighten the compiler settings as coverage grows. We start with the files that break most often and the boundaries where outside data enters, because that is where types pay for themselves first. The build stays green throughout. Before work starts we agree the level of strictness you want to end up at, so the migration has a finish line rather than drifting on forever.
What happens after the work is delivered?
You choose. One option is a clean handover: documentation, a walkthrough for your developers, and the codebase entirely in your hands. The other is our monthly retainer, where we keep running what we built. That means monitoring, fixes against agreed response targets, improvements, security and dependency updates, and a written report each month showing what changed and why. Most of the benefit of typing a codebase shows up over the following year, so someone has to keep the standard from slipping. That can be your team, or it can be us.
How do you stop the types drifting from what the API actually returns?
By generating them rather than writing them twice. Where a schema exists, whether that is an OpenAPI document, a GraphQL schema, a database or a CMS collection, we generate the types from it, so a change at the source breaks the build immediately. Where no schema exists, we check the data at the boundary at runtime, so an unexpected shape is caught and reported instead of flowing into your logic as an assumption. A type that only lives in a developer's head is a comment. We treat the compiler as a test suite, and it runs on every pull request.
Who owns the code, and what happens if we stop working with you?
You own it. The work lives in your repository, on your infrastructure, under your accounts, from the first commit. There is no proprietary wrapper to unpick and no licence you have to keep paying for. If you end the retainer you keep everything: the code, the documentation, the CI configuration and the handover notes. We would rather you stayed because the arrangement works than because leaving is painful. Notice periods, and anything we host on your behalf, are set out in writing at the start.

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Tell us what the codebase looks like. Book a 30 minute call.

Thirty minutes is enough to work out whether TypeScript is the fix or a distraction. You leave with a scope, a timeline and a price. No obligation, and no slide deck.

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