Senior Product Engineer

HappyScribe; Barcelona; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Competitive salary

Equity

Generous token spend policy

30 days holiday

Health coverage

Tax-smart savings

Job summary

HappyScribe in Barcelona is hiring a senior full-stack engineer to own engagement features end to end across Rails backend and React/React Native/Electron apps. You’ll partner with a designer and report to the CPTO, shaping a product area from day one.

You’ll work in a small, pragmatic team with strong emphasis on AI-first development, prototype-driven delivery, and evidence-based quality. Hybrid work with a Barcelona office awaits.

Qualifications

• 5+ years of experience in software development and shipping production apps.
• Strong full-stack capabilities across backend and frontend.
• Experience with design systems or component libraries.
• Proven ability to prototype, ship, and validate features with data.

Responsibilities

• Own Engagement features end to end across Rails backend and React/React Native/Electron apps.
• Collaborate with designer to decide scope, prototype, ship, and validate with evidence.
• Grow the design system and component library with the design team.
• Make architecture calls and improve the pod's output with data-driven decisions.

Skills

Full-stack in production

AI-first

Product judgment

Ambiguity tolerance

Evidence-based quality

Fluent English

Cross-functional collaboration

Tools

Ruby on Rails

React

React Native

Electron

Job description

Hello We’re HappyScribe, a profitable, 100% bootstrapped AI company based in Barcelona. We built one of the web’s most accurate multilingual transcription platforms, trusted by hundreds of thousands of users each month. That product funds our freedom to create what’s next—no investors, no burn rate, just focus. Now we’re taking that same tech and expertise to a bigger frontier: turning conversations into intelligence. We’re building the layer where speech becomes memory, insights become action, and teams work with more clarity and speed. You’d be joining a team of ~17 people, close-knit and pragmatic. Some of us are scaling a mature, revenue-generating platform. Others are prototyping new products that push the limits of speech and agentic AI. We move fast but think long-term. There’s room here to shape, ship, and own real products — not pitch decks.

About the role

You’ll join the Engagement pod, which owns our web app, and our mobile and desktop recording apps. You’ll work in a small team with Matej, Eduard and a designer, and report to Ignasi, our CPTO. You’ll own a product area from day one.

What You’ll Do

• Own Engagement features end to end, across our Rails backend and our React web, React Native mobile and Electron desktop apps
• Decide with your designer what to build, then prototype it, ship it with coding agents, and prove it works with evidence
• Grow our design system and component library together with the designer
• Make architecture calls across the stack, review other people’s work and raise the pod’s bar

What we’re looking for

• You’ve been full-stack in production. You’ve shipped both backend and frontend code that real users rely on
• You’re AI-first. You use coding agents every day, and they write all of your code
• You build things in your own time. Big or small, we want to see it
• You’ve shipped at least one cross-platform mobile or desktop appYou’ve worked on a design system or component library
• You have product judgment. You can partner with a designer and prototype without waiting for mockups or a PM
• You’re comfortable with ambiguity and get moving without full specs
• You check quality with evidence, not by reviewing every line
• 5+ years of experience and fluent English

Nice to have, but you can learn it here

Ruby on Rails (solid experience in another server-side framework is fine), and whichever of mobile or desktop you haven’t done yet.

Company Culture

• A company culture built on trust, autonomy, and independence
• Hybrid set-up - Our setup is hybrid and built on trust. We come together in our Barcelona office for the things that are better in person, and protect focus time wherever you work best.
• Flexible working hours — Work on the schedule that makes you the happiest and productive. Here's more info.
• Barcelona office (Gràcia) — More than a desk. A creative hub. Your space for collaboration and community.
• International & English-fluent — Global team, fully inclusive conversations.

What we offer

• Competitive salary — our salaries are in the top percentiles of the Barcelona startup scene.
• Equity — By joining the company when the team is so small, you’re helping us set the foundations of our future success. We're asking you to come on an adventure, so if we find a treasure, we want you to get a piece.
• Generous token spend policy — We expect our team members to work at the frontier of what's possible with AI. We expect spending, not saving, at the moment
• 30 days holiday allowance — Recharge whenever you need to.
• Health coverage — Alan partnership covers half your medical insurance, anywhere you are.
• Tax-smart savings — Cobee by Pluxee for meals, transport, nursery. Keep more of what you earn.