Full-Stack Software Engineer, Mobile Apps

At Hiya, we're making calls safe, useful, and human again. Voice is the most human form of communication, yet it's become one of the least trusted. Spam, scams, and AI manipulation have eroded what was once a simple way to connect. Hiya is changing that.

Each month our AI voice technology analyzes 28+ billion calls, protecting over 550 million users and 800+ businesses worldwide. Partnering with a growing global network including, AT&T, Samsung, British Telecom EE, Rogers, MasOrange, Bell Canada, MasMovil, and Virgin Media O2, we're not just stopping bad actors, we're helping people feel good and confident about picking up the phone again.

This is a pivotal moment for voice. As new threats and technologies accelerate, so does demand for trusted voice communication. Hiya is growing 40%+ year over year, expanding globally, and defining what voice becomes next.

Join us. You won't just work on what voice is today, you'll shape what it becomes tomorrow: smarter, safer, and genuinely worth answering again.

You will own features end-to-end. That means holding a piece of work from contract through rollout across whichever surfaces it needs to touch, whether that's our TypeScript/Node backend, the iOS app, the Android app, or all three. Some features live mostly in the API layer. Some require real client work on one or both platforms. The job is to deliver the whole thing, not to hand off the parts that aren't your home surface.

This is a builder role. We want someone who likes shipping, can hold a feature from contract through rollout, works across stack boundaries without friction, and gets things in front of real users.

In the first ninety days, expect to:

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  Ship meaningful production code on one of our two products. We care less about scope than about you owning it end to end.

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  Define and defend an API contract with mobile and design before writing the feature behind it, and iterate on that contract as you learn.

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  Develop a point of view on how the team's agentic workflow is serving you, and raise the places where it isn't.

These are habits, not credentials. We will probe them in conversation. We don't care much about your résumé. We care about how you think and execute, and we will test that live in the interview.

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  25 holiday plus bank holidays

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  Opt in salary sacrifice pension scheme (company full 4% of basic salary contribution)

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  Paid parental leave

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  Private medical insurance through Vitality (including dental & vision)

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  Employer-paid life insurance 2x base salary

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  Donation Matching for a charity of your choice (up to $1,000/ year)

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  WFH equipment stipend

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  $1,000/year in Professional Development funds

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  Lunch provided on in- office days

This position is based in London, UK. Office post code: W1F 8WE

We're building a team with diverse perspectives, identities, and professional experiences. We evaluate candidates through a business lens and believe that diversity and unique viewpoints make our company stronger, more dynamic, and a great place to build a career.

We've been recognized by Built In, GeekWire, Comparably, G2, Forbes, and Deloitte Technology Fast 500 for our culture, innovation, leadership, compensation, and more. At Hiya, we're a people-centric company focused on helping each employee grow both personally and professionally. We create a culture of support and empowerment that challenges the status quo, resulting in an energized team that's passionate about their work. You'll love working here if you're looking for an innovative challenge that's disrupting an industry. Come join us!