Backend Mid Developer

Frekuent; Barcelona; Híbrido; EUR 55.000 - 75.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Hybrid work model

Meal vouchers

Private health insurance

Gym discounts

English classes

Descripción de la vacante

Frekuent is building the engine behind payments and loyalty for unattended environments. We seek a backend engineer to own features end-to-end with AI-assisted workflows, collaborating with Product and Data teams to deploy scalable, reliable systems.

Join a lean, senior team that moves ideas from Slack to production quickly, using AI tools to accelerate delivery while maintaining code quality and resilience. Bilingual Spanish/English is a plus in our multilingual environment.

Formación

• 3+ years building backend systems in production for a product company.
• Experience conceiving, building, shipping, and measuring impact of features.
• Comfortable in fast, data-driven agile teams with scope changes.

Responsabilidades

• Own features end-to-end: architecture, implementation, release, and metrics.
• Use AI-assisted development to ship high-quality code rapidly.
• Design and integrate AI-powered features with Product and Data teams.
• Conduct real code reviews and architectural sparring with peers.
• Hunt down bugs and convert learnings into reusable libraries.
• Spot scaling and reliability issues before they escalate.

Conocimientos

Backend development

Product-company experience

Agile team experience

Cloud infrastructure (Azure)

Bilingual Spanish/English

LLM/AI integration

Educación

Degree in Computer Science/Engineering

Herramientas

LLM APIs

RAG pipelines

Vector databases

Azure Cloud

Descripción del empleo

Get to know us:

Started in 2016, Frekuent is now the all-in-one payment and loyalty platform for unattended environments — 500+ clients, 100M+ transactions a year, 2.5M+ users across Spain, France, Italy, Portugal, and Singapore. We turn one-time buyers into lifetime clients with cashless, contactless, effortless payments: less friction, more reasons to come back.

2026 has been our biggest year yet — we've hyperscaled from 40 to 100+ people, with more hires on the way, and closed a €6M funding round to fuel what's next.

And we're just getting started — our goal is to become the default payment and loyalty layer behind every unattended transaction, everywhere.

Curious? Check us out at www.frekuent.com.

Why this role exists:

At Frekuent, we don't build backend systems for their own sake — we build the engine behind products people actually use. You'll join a lean, senior product engineering team where ideas move from a Slack thread to production in days, not quarters, and where every tool at your disposal — including the AI ones we build with daily — is treated as leverage, not overhead.

If you've outgrown "ticket-taking" backend work and want to be in the room when a feature gets conceived, not just when it gets assigned to you, this is that room.

What you'll actually do:

• Own features end-to-end: architecture, implementation, release, and the metrics that tell you whether it worked.
• Use AI-assisted development as a default part of your workflow — we optimize for shipping quality code fast, not typing it manually.
• Help design and integrate AI-powered features into our product — from LLM-backed workflows to smarter automation — alongside our Product and Data teams.
• Do real code review and architectural sparring with people who'll push back on your ideas (and will expect you to push back on theirs).
• Hunt down gnarly bugs and turn what you learn into reusable libraries, not tribal knowledge.
• Spot scaling and reliability problems before they page anyone at 2am.

What you bring:

• 3+ years building backend systems in production — ideally inside a product company, not only an agency or feature factory.
• You've been in the room for a product's 0→1 journey at least once: conception, build, ship, measure impact.
• Comfortable in agile teams that move fast and change scope when the data tells them to.
• Working knowledge of cloud infrastructure — Azure experience is a strong plus.
• Fluent in Spanish and English.
• A degree in Computer Science, Computer Engineering, or equivalent hands‑on experience — we care more about what you've shipped than the paper.
• Have hands‑on experience integrating LLM APIs, building RAG pipelines, or working with vector databases.
• Have experimented with prompt engineering or AI agent frameworks in a real product context.
• Have opinions about MLOps and can defend them.
• Have built or scaled payments or fintech infrastructure (a plus, not a requirement).

How we work:

• Fast, autonomous, low-bureaucracy — you'll manage your own priorities more than someone will manage you.
• We measure output, not hours in a chair.
• Resilience matters here — not "never taking no for an answer," but the steadiness to keep improving a system after the first two attempts didn't work.

What’s In It For You

A hybrid model that works – Enjoy the energy of our office 3 days a week and the flexibility of working remotely the other 2.

Flexible schedule – because we trust you to own your time and your outcomes.

Meal vouchers – Enjoy a monthly support of meal vouchers to make your workdays tastier.

Health & wellness – private health insurance and discounted gym memberships to keep both body and mind in top shape.

Learning & development – English classes and role‑specific training, because your growth is part of our journey.

23 days of paid time off – plus local holidays, because great ideas need space to rest.

A dynamic, fast-growing environment – where each day is unique and every idea counts.

A collaborative mindset – surrounded by people who genuinely enjoy building together.

Regular afterwork & teambuilding events – activities to relax, connect, and strengthen team bonds.

If you're ready to jump into an exciting environment and make a real difference, this is the place for you.

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