Graduate Product Engineer

TL;DR

We're a global e-invoicing platform operating in 25+ countries

Revenue grew 10x last year, and we plan to 3x in 2026.

Role: own integrations end-to-end, research, define, build, ship, iterate with customers. No PMs or bureaucracy in between.

Looking for: new grads engineers with strong software development fundamentals, fluent English (no Spanish required), a builder mentality, and comfort with ambiguity.

Compensation: €45k base + Employee Stock Options (ESOP)

Location: Madrid (4-5 days/week in office).

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Hi there 👋🏼,

I’m Juan, CEO of Invopop. We help companies like Fever, DeepL, and Booksy issue and receive invoices that comply with local requirements across 25+ countries.

We hire only exceptional early-career talent. If you’re looking for the fastest way to become a great engineer, or eventually start your own company, it’s hard to beat working directly with Sam Lown (founding CTO of Cabify) and Juan Moliner (ex-BCG) and a small, high-bar team where your work ships to production and direct customer interaction.

This is a full-time role for someone who has completed (or is about to complete) university and can join Invopop within 1–2 months.

About Invopop

Invopop helps global companies like SumUp, Fever, or DeepL manage electronic invoicing in over 25 countries through a single API.

In the next five years, more than 40 countries, including the entire EU, will mandate that businesses send invoices electronically in XML formats and report them live to tax authorities. This reduces fraud and enables companies to automate invoice processing instead of relying on OCR. There’s only one catch: each country has defined unique standards, forcing global companies to build dozens of local integrations—or integrate once with Invopop.

Invopop was founded by Sam Lown, co-founder and former CTO of Cabify (Spain's first tech unicorn), and Juan Moliner (ex-BCG), based on Sam’s experience dealing with this problem in ten Latin American countries with Cabify

We’ve raised €2.8M from top-tier venture capital firms, including YCombinator (W23), and have been named the Best Startup at South Summit 2024 and Madrid's Hottest Startup of 2024 by Wired.

Your mission as a Graduate Product Engineer

You’ll own one or more Apps from research to production

Design and build backend integrations in Golang

Investigate new countries and systems: read docs, interpret requirements, ask questions, and turn ambiguity into a clear plan.

Make product decisions with support: what to build first, what to cut, when to ship.

Support customers using your integrations and iterate based on real feedback.

Who we're looking for

Degree in Computer Science or Telecommunications Engineering, or a proven track record building software outside formal education.

Evidence of exceptional ability: top of your class, standout projects, or similar

Builder mindset: side projects, open-source contributions, hackathons

Fluent English (spoken and written). It’s our working language.

You can join full-time in Madrid within the next 1-2 months

Where you'll work

We’re in Madrid (Calle Guadalquivir 22, El Viso), 5 minutes from Nuevos Ministerios.

We enjoy the energy and collaboration of working together in person. We expect you to default to working in-person, but trust you to find the best balance between office and remote work.

Why join Invopop

Real ownership from day one: you’ll ship production work that customers rely on.

Steep learning curve: you’ll grow fast with direct feedback and high standards.

Work closely with Sam Lown (founding CTO of Cabify) and a small, senior team.

Hyper-growth: 15 launches planned in 2026 and a 3x growth goal.

High-signal culture: good product and good engineering win.

Interview process

The process has four steps:

Intro call (30 min)

Take-home exercise

Technical interview (1h)

Final interview, in person (1h)