Open a handful of SaaS Engineering Job Descriptions right now and you’ll see the same word again and again: TypeScript.
It turns up in Frontend roles, Backend roles, Full-stack roles and, more and more, in roles where the language barely matters to the job.
That isn’t just fashion.
For many Engineers, a typed stack has become a signal of how a team works, and for Hiring Managers it has quietly changed who applies, who says yes and how long roles stay open.
This blog looks at why TypeScript has become so common in SaaS hiring, what it tells candidates about you, and how to hire for it sensibly.
How TypeScript became the default
A few years ago, TypeScript was a choice. Now, for a lot of SaaS teams building on the web, it’s the starting point.
Part of that is the ecosystem. The most popular frameworks and tools ship with first-class TypeScript support, and many new projects begin with it switched on. Part of it is scale. As codebases grow and more people touch them, catching mistakes before they reach production becomes far more valuable than saving a few keystrokes.
And part of it is the shift towards one language across the stack. With Node.js on the server and TypeScript on both sides, a small team can share types between frontend and backend, move people between them more easily and ship features end to end without a handover.
For early-stage SaaS companies trying to move quickly with a small team, that combination is hard to ignore.
What Engineers read into it
Here’s the part many Hiring Managers miss. When a candidate sees TypeScript in a job description, they don’t just read it as a skill requirement. They read it as a clue about the team.
To a lot of Engineers, a typed codebase suggests the team cares about maintainability, refactors with some confidence and has thought about how the product will hold up as it grows. An untyped JavaScript codebase of any real size can suggest the opposite: years of quick fixes, fragile areas nobody wants to touch, and a lot of time spent debugging things a compiler could have caught.
That’s not always fair. Plenty of excellent teams run on plain JavaScript. But perceptions shape applications. If your stack looks like a legacy clean-up job, the strongest candidates will assume it is one, and some will never apply.
The hiring market behind the trend
TypeScript experience has gone from a nice-to-have to something many mid-level and senior web Engineers simply have. That’s good news for hiring teams in one sense: the pool is large.
The trouble is that “TypeScript” on a CV now covers a huge range. At one end are Engineers who’ve used it lightly, adding the occasional type to keep the linter quiet. At the other are Engineers who design type systems for shared libraries, model complex domain logic in types and know exactly where to stop.
If your job description just says “experience with TypeScript”, you’ll attract both, and your interview process has to do all the sorting. That costs time, and in a competitive market, time is when good candidates accept other offers.
How to write the Requirement properly
The fix is being specific about what you actually need. A few questions help:
Is TypeScript central to the role, or just part of the environment? For a frontend or full-stack product Engineer, it may be core. For a data or infrastructure role, it might be something they’ll pick up in a fortnight.
What level of depth matters? Do you need someone to work comfortably in an existing typed codebase, or someone to design shared types and set standards for the whole team?
Would you hire a strong engineer from another typed language? Engineers coming from languages like C#, Java, Kotlin or Go often adapt to TypeScript quickly. Ruling them out can shrink your pool for very little gain.
Write the job description around those answers. “You’ll work in a TypeScript and React codebase and help shape our shared types between frontend and API” says far more, and filters far better, than a line in a list of required technologies.
Assessing TypeScript skill without overdoing it
In interviews, resist the urge to quiz people on obscure language features. It tells you very little about how they’ll work day to day.
Instead, give candidates a small, realistic piece of code. Ask them to extend it, refactor something awkward or review a pull request with a few type-related problems hidden in it. You’ll quickly see whether they use types to make code clearer and safer, or treat them as an annoyance to work around.
Ask too about trade-offs. When would they loosen the types? How would they introduce TypeScript into a JavaScript codebase without stopping feature work? Good engineers have nuanced answers, and those answers tell you a lot about judgement.
If your codebase isn’t typed yet
If you’re still on JavaScript and planning a migration, say so in the job description. Plenty of Engineers find a well-planned move to TypeScript an appealing project, especially if they’ll help lead it.
What puts people off is discovering it after they’ve joined, or finding that “we’re moving to TypeScript” has been on the roadmap for three years with no progress. Be honest about where you are and what support the work will get.
A small word with a big signal
TypeScript in a job description is no longer just a technical detail. It’s part of how you describe your team, your standards and the kind of work Engineers will be doing.
Get the wording right and it helps the right people find you. Get it wrong and you’ll either drown in mismatched applicants or quietly put off the ones you most wanted.
If you’re hiring Engineers into a TypeScript stack and want help shaping the brief, the Runtime team is always happy to chat.
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