Full Stack Developer

We're looking for a talented and curious Full Stack Developer to help take our product to the next level.

Our engineering and product teams are already disrupting the industry with our unique, 4 network, data-only product, Smart SIM . But we know there's much more to build. That's where you come in.

In this role, you'll help shape the technical direction of our product, looking beyond the standard stack to introduce new technologies, techniques, and ideas. You'll play a key role in the full development lifecycle, delivering high-quality features and continuously improving how our backend and frontend platforms are built.

You'll work across our API, databases, network and infrastructure, internal tools (including team and customer-facing dashboards) and web-based interfaces, creating experiences that truly delight our users.

Reporting to the Head of Engineering, you'll be a core part of our small but mighty tech team, collaborating closely with developers and product to make a meaningful impact across the full stack.

Our engineering team is at an exciting stage of growth as we explore how AI can accelerate development, level up our coding, enable fast adoption of new languages and frameworks, to help us achieve our ambitious goals. ️ Key responsibilities

• Build and develop our React Native app, delivering new features, fixing issues, and reducing technical debt
• Develop web applications using React/TypeScript, including customer-facing account management and internal dashboards
• Help to maintain backend APIs, adding attributes and endpoints to support new features and improvements
• Design and implement asynchronous workflows to manage customer and service lifecycle requests (experience with Temporal is a plus)
• Collaborate in code reviews and architecture discussions to maintain high engineering standards
• Troubleshoot and resolve production issues across the full stack
• Work cross-functionally with product, customer ops, and marketing team to deliver seamless user experiences
• Help shape engineering best practices and build internal tools to support our team

• You're a strong generalist with experience across both frontend and backend
• You're fluent in modern TypeScript but you're language-agnostic and enjoy picking up new languages and frameworks
• You're comfortable with CI/CD workflows and typical DevOps processes relating to deployment of Dockerised Node applications to Cloud Hosting environments (esp. GCP)
• You have more than a passing familiarity with relational databases (e.g. Postgres) and writing efficient SQL
• You're pragmatic, curious, and motivated by solving real user problems
• You're comfortable owning projects end-to-end in fast-moving environments
• You're committed to clean, maintainable and well-documented code
• You're a clear communicator, who collaborates effectively
• You're comfortable asking questions and challenging assumptions
• You're excited by AI and its potential to accelerate development and support rapid iteration and experimentation

Bonus points if:

• You have experience working in a fast-paced start-up environment
• You have experience GCP
• You have experience in Temporal

Interview process

• Introductory call with our Head of People & Impact (30 mins)
• Interview with our Head of Engineering and Backend Engineer (1 hour)
• In-person interview:

• 1-2 hour interactive live coding session
• 30 min break
• 1 hour interview with Andy and Josh, our Co-Founders

We understand it is a big commitment to come in, so we are happy to pay you for this time. What's it really like to work in the engineering team at Honest?

Honest by name, honest by nature. We like to be upfront about how we work, so here's what you need to know.

Life in our engineering team moves fast. Priorities shift, ideas evolve, and plans change as we stay nimble and focused on what matters most.

Honest is a place for people who enjoy adapting, thinking on their feet, and learning as they go. What you're building today might look different tomorrow - not because it was wrong, but because we've found a better way forward.

No two days are the same. It's dynamic and exciting, and best suited to engineers who thrive in fast-paced environments and see change as an opportunity, not a blocker.

We're building something new together from the ground up. Ready to join the fun? Support during the process

If you have a disability, health condition, or any access needs and would like us to make adjustments to our process, please let us know. We're happy to work with you to make sure you have what you need to take part fully and comfortably. Email Fi , our Head of People & Impact. She's here to help. UK work eligibility

We can only accept applications from those eligible to live and work in the UK. We are unable to sponsor visas for this position. What you'll get in return for all your hard work?

Salary: £70,000 - £80,000

️ Ownership in Honest through our EMI option scheme

25 days of annual leave, plus all bank holidays

Your birthday off each year on us!

A hybrid-first working environment with at least 1 day per week in the London office

An Honest sim, and refurb phone on us

1 paid volunteering day each year

Wellbeing budget through Heka

Cycle to Work scheme

£500 annual learning budget

Regular in-person team socials

Private medical insurance Why join Honest?

Backed by top investors including Sidebyside, DMGV, WAYRA, Ascension and TinyVC

Being part of a talented team that likes to have fun

Fast-learning, entrepreneurial environment where we focus on supporting your growth and personal development

Opportunity to help shape the future of Honest

We'll provide you with all the tools and technology you need to do your best work

Working for one of the UK's top rated mobile networks on Trustpilot

Make your mark at the UK's most ethically rated and highest scoring B Corp mobile network Diversity, inclusion, equity and belonging at Honest

Here at Honest, we're all about doing the right thing, even especially when no one's looking.

That includes building an inclusive environment where everyone feels like they belong and proud to be their true selves everyday. We're committed to providing the support our team needs to thrive and do their best work.

We believe it's our differences that make us stronger and celebrate diversity in the Honest team. Learning from one another's unique experiences, perspectives and ideas is how we win.

Hello, we're Honest. The clue's in the name: we're the network doing mobile right. We're on a mission to fix a broken industry and show there's a better way to do mobile, for both people and the planet. For too long, the big mobile networks have been taking advantage. We think customers deserve better. Way better. So instead of counting profits and doling out the bare minimum, we give customers what they actually want. That means bills that drop every month, support in seconds, and sustainability efforts that shrink their carbon footprint. Powered by cutting-edge technology, we're building the next generation mobile network. This includes our unique Smart SIM that offers unbeatable coverage and free use of essential 500+ apps worldwide. That's not all. We're also the UK's first B Corp mobile network, a carbon-negative company and member of 1% for the Planet But building the world's best mobile network requires having the right people to help us do it. That's where you could come in.