Lead Front End Developer Job Description | what3words

About what3words

Street addresses weren’t designed for 2020. They aren’t accurate enough to specify building entrances, and they don’t exist for parks, rural areas and many parts of the world. This makes it hard to find places and causes problems and inefficiencies on a global scale.

That’s why we created what3words. We divided the world into 3m squares and gave each square a unique combination of three words. It’s the easiest way to find and share precise locations.

Last year, what3words was used in 193 countries, and our monthly active users increased from 100,000 to over a million. Our tech is used by emergency services, delivery companies, ride-hailing apps and NGOs, and is integrated into the navigation systems of Mercedes-Benz cars.

what3words was iOS App Store App of the Day in 143 countries

We’re used by emergency services across the UK and internationally

And we’re also available in over 45 languages

Who we’re looking for

We’re looking for a Lead Front End engineer who has built and delivered innovative products and features and who enjoys creating engaging experiences that people love to use. At what3words, we’re proud of our tech stack. We have built a massively scalable, microservices-based architecture, based around Kubernetes on AWS. You’ll be exposed to technologies such as ReactJS, Docker, Redis, AWS Lambdas, Prometheus, Grafana, Python, Athena, BigQuery, Java, Scala, C++, and Swift.

This a great opportunity to join a collaborative and ambitious Agile team, at one of the most exciting times in this company’s life.


This role will focus primarily on the development of our map site, corporate site, developer portal and playgrounds, but we’re always looking for new platforms and products to build, opening what3words up to as many users as possible. This includes various voice assistant platforms and in-house tools & demos to assist our sales and marketing teams. You will also work closely with our product and UX teams, receiving and inputting on designs and feasibility checks, and bringing fresh ideas to make what3words a better solution.

You will have good experience of building gorgeous user interfaces on top of RESTful web APIs, using React, JavaScript, CSS. You will be able to work independently, self-motivate, collaborate well with others and keep calm under pressure.

What we expect:

  • Deep expertise in Javascript (ES6), TypeScript, React, HTML, CSS
  • Excellent communication skills in verbal and written English.
  • A passion for software engineering and continuous learning.
  • Strong track record of building responsive sites for desktop, tablet and mobile.
  • Experience as a technical lead in cross-functional teams, leading architecture decisions and working with other product and engineering leaders
  • A passion for helping people grow and seeing them successfully navigate complex challenges
  • Ability to create a supportive and inclusive culture, listening to others, and finding the opportunities for your team to grow

Our team has around 100 people, with offices in London, Mongolia, and South Africa

Our purpose built London office is based near Paddington, on the Circle Line

We have over 20 different social clubs including yoga, football, and comedy improv


We offer the following benefits to all permanent employees of what3words:

  • 25 days holiday
  • Share options
  • Pension
  • Bupa Healthcare + Babylon Health
  • Bupa Rewards
  • Cycle to work
  • VDU eye tests
  • Life Assurance
  • Free breakfast & snacks
  • Birthday vouchers
  • Weekly lunch & learn sessions
  • Regular team lunches & team socials
  • Sports and hobbies clubs

Diversity & Inclusion

Our mission is to help everyone talk about everywhere, and we believe diverse perspectives make for a better company and better products too. We strongly encourage applications from underrepresented groups and are committed to equality and inclusivity in our hiring processes and company culture.

Read about our tech

The 7KB web page that can save a life

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Kubernetes or: How I Learned to Stop Worrying and Love the Container

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Not just an input box

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