1 – What you must require from a TypeScript developer before trusting them with your code
TypeScript is not JavaScript with annotations. A developer who sprinkles types onto JS code without understanding the type system produces technical debt disguised as safety. Here is what separates a true TypeScript profile from a JavaScript developer who read the docs one Sunday evening.
1.1: Strict typing, generics and utility types: the non-negotiable foundation
The first filter is the tsconfig setup. A competent TypeScript developer enables strict: true by default. No noImplicitAny disabled. No skipLibCheck in permissive mode just to make it compile. Strict typing is not a cosmetic option — it is the very reason TypeScript exists.
Beyond configuration, the profile must handle generics with ease. Creating reusable functions and components with type constraints, using native utility types (Partial, Pick, Omit, Record, ReturnType), writing conditional types when the architecture calls for it. These are not advanced skills reserved for architects. They are the day-to-day reality of any TypeScript developer working on a production codebase.
A profile that reaches for any the moment they encounter compiler resistance does not master TypeScript. They endure it. And your code pays the price with every refactoring.
1.2: Mastery of the Node.js and React ecosystem in TypeScript
TypeScript alone produces nothing. What matters is the developer's ability to use it within your actual stack. If you run on React, they must type props, custom hooks, and state management (Zustand, Redux Toolkit, or Context API) without resorting to type assertions on every line. They must understand React types (FC, PropsWithChildren, typed event handlers) and know when not to use them.
On the Node.js side, the profile must write fully typed APIs end to end. Express with explicit request and response types, or better yet: TypeScript-first frameworks like NestJS or tRPC. Runtime validation with Zod or io-ts, combined with static typing, eliminates an entire category of bugs.
A full stack TypeScript developer who masters both environments is a profile capable of guaranteeing type consistency from front to back. A single source of truth for your API interfaces. Zero divergence between what the server sends and what the client expects.
1.3: Ability to lead or contribute to a JavaScript-to-TypeScript migration
Many SMEs and startups have an existing JavaScript codebase. Migrating to TypeScript does not happen over a weekend. It requires a progressive strategy: enabling allowJs, converting file by file starting with the most critical modules, writing declaration files for untyped dependencies, gradually tightening strictness.
A good TypeScript developer knows how to prioritize. They start with the shared layers (data models, API services, utilities) to maximize the impact of typing on bug detection. They leave stable files that never change untouched. They document each step so the rest of the team can follow.
This migration skill is rare. It combines a deep understanding of the type system with engineering pragmatism. If your project requires this transition from JavaScript to TypeScript, you cannot entrust it to a junior profile discovering the language. Un développeur dédié à temps plein who knows your code and grows in competence on your specific codebase is the only format that works for this kind of project.
2 – How TARAM recruits and tests a TypeScript developer before presenting them to you
You do not have time to sort through CVs or interview profiles who cannot tell the difference between interface and type. TARAM handles the entire recruitment process, with technical standards calibrated specifically for TypeScript.
2.1: A TypeScript technical test designed to eliminate superficial profiles
The technical test we administer is not a multiple-choice quiz. It is a real coding exercise, run in a strict TypeScript environment, with constraints that reveal the candidate's true level.
The test covers: creating complex types with generics and conditional types, refactoring a JavaScript module to TypeScript with strict: true, writing a fully typed API endpoint end to end (request, validation, response), typed error handling (discriminated unions rather than generic try/catch), and writing unit tests on typed code.
A candidate who passes this test has proven they do not merely make code compile. They produce TypeScript that protects your codebase against regressions, makes refactoring safe, and allows any developer to understand data contracts just by reading the types.
Every candidate then undergoes a supervised live coding session. We verify their ability to reason out loud, search the documentation, and acknowledge when they do not know something. Les protocoles qui séparent le code fiable du code jetable begin at recruitment, not after signing.
2.2: Joint validation with you before any integration
TARAM never sends you a developer blindly. After our internal tests, you receive a complete file: technical test results, the code produced (you can read it, review it, critique it), the live coding evaluation, and a skills summary.
You then conduct your own interview with the candidate. You ask your questions about your stack, your architecture, your business constraints. If the profile does not suit you, we start over. No additional fees, no negotiation.
This process exists because the goal is not to fill a position. It is to integrate a team member who will touch your code every day, for months or even years. If the connection is not there, if the technical level does not exactly match your expectations, it is better to know before the first commit. Not after three months of rocky collaboration.
A dedicated TypeScript developer who does not work out after integration remains a problem. Le protocole pour trancher vite et remplacer sans perdre votre trimestre exists at TARAM, but the objective is never to have to activate it, thanks to rigorous upfront recruitment.
2.3: Infrastructure and working conditions that guarantee productivity
A TypeScript developer works with a demanding compiler, a heavy IDE (VSCode with the TypeScript language server consumes significant memory), and builds running continuously. On a slow machine, every type check takes seconds. Multiply that by hundreds of saves per day and you lose hours of productivity every week.
Every TARAM developer works on a Ryzen 7 workstation with enough RAM to ensure the TypeScript language server never slows down, even on a codebase of several hundred thousand lines. Fiber connection backed up by 5G. No outages, no latency on Git pushes, no freezing video during the daily standup.
Management is handled from Maurice by a European leadership team. The developer in Madagascar produces. The management in Maurice oversees quality, HR processes, and logistics. This geographical separation is not an organizational detail — it is the structure that ensures your developer stays focused on your code instead of dealing with administrative issues.
3 – What a dedicated TypeScript developer changes about your ability to ship
You are not looking for a developer for the sake of having one. You want to ship faster, stabilize your codebase, and stop losing time to avoidable bugs. Here is what the integration of a dedicated TypeScript developer through TARAM concretely produces.
3.1: Your roadmap moves forward because the dev knows your code, not because they are discovering the project
The problem with a TypeScript freelancer is not the daily rate. It is discontinuity. Every new freelancer spends two to three weeks understanding your architecture, your naming conventions, your shared types, your business abstractions. Then they leave. The next one starts from scratch.
A full-time dedicated developer accumulates context. After two months, they know your business types by heart. They know why a given generic exists, why a particular discriminated union was designed that way, where the technical debt zones are that should not be touched. That knowledge cannot be transferred into a document. It is built by working on the code day after day.
The direct consequence: velocity increases mechanically. Not because the developer types faster, but because they no longer waste time rediscovering what their predecessor had already understood. Si votre roadmap a six mois de retard, it is probably because you change developers too often, not because you lack technology.
3.2: Strict typing reduces your production bugs without increasing your testing effort
TypeScript used properly catches entire categories of bugs before execution. Missing property on an object, wrong type argument passed to a function, unhandled case in a switch on a union. The compiler refuses to produce JavaScript as long as these errors exist.
But this advantage only works if the developer writes real types. Not any. Not type assertions to silence the compiler. Not //@ts-ignore scattered throughout the code. A dedicated TypeScript developer, trained and evaluated on strict typing, produces code that genuinely leverages the type system.
The result: fewer production bugs, fewer support tickets, fewer emergency hotfixes on Friday evenings. Your QA team (if you have one) focuses on functional and integration tests instead of hunting null pointer exceptions. Your confidence in deployments increases. You move from "we deploy on Thursdays because we are afraid of Fridays" to "we deploy when it is ready, because the compiler has already verified it".
3.3: A controlled cost that lets you double your development capacity
A senior TypeScript developer locally costs €55,000 to €70,000 gross annually, plus employer contributions, equipment, and legal risk. As a freelancer, that is €450 to €650 per day, with no commitment to continuity or availability.
A dedicated TypeScript developer through TARAM costs a fraction of these amounts. On a local permanent contract in Madagascar, with premium infrastructure, structured management from Maurice, and a continuity commitment. For the budget of one local developer, you integrate two. Your delivery capacity doubles without your local payroll moving a single euro.
This is not low-cost. It is intelligent geographical arbitrage. The developer is paid correctly for the local market, works in premium conditions, and benefits from European oversight. Code quality is not an adjustable variable. Le mode opératoire complet pour renforcer votre équipe tech without hiring locally relies on this logic: same technical standards, same tools, same tracking rituals, operating cost divided.
Every week without a dedicated TypeScript developer, your technical debt grows heavier
Your untyped JavaScript codebase is accumulating silent bugs. Your TypeScript migration is still a sticky note on a Notion board that nobody touches. Your current freelancer is responding more and more slowly. Your job posting is generating only profiles who confuse TypeScript with "JavaScript + interface".
While you hesitate, your technical debt grows. Every any added today is a production bug tomorrow. Every week without reinforcement is a feature your competitor ships before you.
TARAM recruits, tests, and integrates a dedicated TypeScript developer into your team. One dev, one client, zero sharing. Tested on strict typing, validated by you, plugged into your tools from day one. Contact us now. Not next week.
