Senior Product Engineer

HappyScribe; Bellprat; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Competitive salary

Equity

Generous token spend

30 days holiday

Health coverage

Tax-smart savings

Job summary

HappyScribe, a profitable bootstrapped AI company based in Barcelona, is hiring for an Engagement lead. You’ll own a product area from day one, shipping features end to end across Rails, React, React Native and Electron.

You’ll prototype with a designer, grow the design system, and make architecture decisions to raise the bar for the pod. You’ll join a close-knit team, work in a hybrid Barcelona setup, and contribute to cutting-edge conversations turning speech into intelligence.

Qualifications

• 5+ years of experience in full-stack development and shipping production code.
• Fluent English with strong written and verbal communication.
• Experience with design systems or component libraries is a plus.
• Ability to prototype and ship with minimal specs in a fast-paced environment.

Responsibilities

• Own Engagement features end to end across Rails backend, React web, React Native mobile and Electron desktop apps.
• Collaborate with a designer to decide what to build, prototype, ship with coding agents, and prove results.
• Grow the design system and component library alongside the designer.
• Make architecture calls across the stack and raise the pod's bar.

Skills

Full-stack engineering

AI-first development

Cross-platform app experience

Design system experience

Product judgment

Ambiguity tolerance

Evidence-based quality

Education

Bachelor's degree in CS or related field

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 app

• You’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.