Engineering

Senior Frontend Developer

Own the interface platform teams use every day to deploy, watch and fix their workloads. You'll shape how a complex Kubernetes control plane feels simple in the browser.

EngineeringRemote / London, UKFull-time

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About the role

Tantilium Cloud Runner puts cluster management, deployments, observability, cost and security in one web app. Most of the heavy lifting happens behind an API, but people judge the product by what they see: a rollout they can follow, a log view that loads quickly, an incident page that tells them what to do next.

You'll be one of a small group of engineers responsible for that experience. The app is built with Next.js, React, TypeScript and Tailwind CSS, and talks to a set of Go services over REST and WebSockets. You'll have a real say in how it grows: component patterns, data fetching, performance budgets and the accessibility bar we hold ourselves to.

What you'll do

Build and ship features end to end, from a rough design to production, including the API conversations that come with them
Turn dense operational data such as pods, rollouts, metrics and traces into screens people can read at a glance
Keep the app fast as it grows: measure, profile and fix what's slow, especially for customers with large clusters
Make sure keyboard and screen-reader users can do everything everyone else can
Work with design on a shared component library so new pages look and behave consistently
Review code, pair with other engineers and help newer teammates find their feet
Write tests where they earn their keep, and keep the build and CI quick

What you'll bring

Several years building production web applications, with a good stretch of that spent in React and TypeScript
Hands-on experience with Next.js or a similar framework, including server rendering and routing
Strong CSS skills. You can build a responsive layout from scratch, and utility-first CSS like Tailwind doesn't put you off
A working knowledge of web accessibility (WCAG) and how to test for it
Experience making a slow app fast, and the numbers to show for it
Comfort working with REST APIs and live data over WebSockets or server-sent events
Clear written communication. We're remote, so a lot of decisions get made in pull requests and short design docs

Nice to have

You've built dashboards, developer tools or other data-heavy products before
Some time with Kubernetes, even if it's only your own side projects
Experience with charting libraries such as Recharts or D3
End-to-end testing with Playwright or Cypress

Don't meet every point on the list? Apply anyway. Job descriptions are a best guess at what the role needs, and we'd rather hear from you than miss out.

What success looks like

Within your first month, you've shipped a feature customers use
By month three, you own an area of the app and other engineers come to you about it
We have agreed performance budgets for our busiest pages, and CI tells us when we break them
Accessibility problems get caught in code review, not reported by customers

Who you'll work with

You'll work day to day with backend engineers, product and design. We work asynchronously by default and keep meetings short and purposeful.

How we hire

We keep the process short and tell you where you stand at every step.

1
Intro call
30 minutes to talk about the role, what you're looking for next, and anything you want to ask us.
2
Technical conversation
An hour walking through something you've built. We're interested in the trade-offs you made, not a polished pitch.
3
Practical exercise
A short take-home or a live pairing session, whichever suits you. We'll tell you up front how long it should take.
4
Meet the team
Conversations with the people you'd work with most, covering how you collaborate, give feedback and handle disagreement.
5
Decision
We aim to come back to you within a few working days of your last interview, whatever the outcome.

What we offer

Working at Tantilium

Remote-first

Work from wherever you do your best work. We hire across time zones and plan our days so you're not on calls at midnight.

Competitive pay and equity

Salary that's fair for the role and your experience, plus equity so you share in what we build together.

Health cover

Comprehensive health benefits for you, with options for your family.

Time off that you actually take

Generous paid holiday on top of public holidays. We'd rather you rest than burn out.

Learning budget

An annual budget for courses, books and conferences, plus support if you want to sit a certification like the CKA.

Good equipment

A laptop and setup that suits how you work, so your tools never get in the way.

Interested in this role?

Applying takes about five minutes: your details, your CV, and a few lines on why this role appeals to you. A real person reads every application.

Apply for Senior Frontend Developer

Tantilium is an equal opportunity employer. We welcome applications from people of every background, and we don't discriminate on the basis of race, religion, colour, national origin, sex, sexual orientation, gender identity, age, disability, veteran status or any other characteristic protected by law. If you need any adjustments during the hiring process, tell us and we'll make them.