Invopop was founded by Sam Lown, co-founder and former CTO of Cabify, and Juan Moliner (ex-BCG), based on Sam’s experience dealing with this problem at 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 Backend Product Engineer

With Invopop, users build workflows by chaining Actions, each action being managed by an App. An App is a standalone service focused on a single goal, such as reporting an invoice to a tax authority, synchronizing it with an external system (e.g., ERP), or transforming/enriching a document.

As a Staff Backend Product Engineer, you’ll be the owner of several Apps end-to-end, from the initial research to launching, and maintaining them in production:

• Investigate new countries and systems: read regulations and technical docs, turn ambiguity into clear requirements, and consult local experts when needed.

• Design and build integrations in Go on top of our modular architecture (NATS, CQRS patterns, Kubernetes on GCP).

• Make product decisions: what and how to build it, what to cut, and when to ship.

• Support customers using your Apps and iterate based on real feedback.

• Contribute to GOBL, our open-source standard for commercial documents.

Who we’re looking for

• Backend engineering experience, ideally with Golang.

• Strong communication skills in English.

• Empathy for customers—you're eager to engage with clients and influence product decisions.

• Comfortable defining the scope as you build, learning new technologies, and navigating unfamiliar domains.

• Experience starting projects from scratch—perhaps as a founder, open-source contributor, or through impactful side projects.

Compensation

€50k–€90k base + Stock Options, depending on seniority level.

If you have 10+ years of experience and are looking for a higher-leverage role (broader scope, leading multiple tracks), we’re also hiring for a Senior Product Backend Product Engineer (€90k–€140k base + ESOP).

Where you’ll work

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

No fixed schedule. We expect at least 3 days/week in the office — high-context work moves faster in person. Sam and I are often in the office, and part of our role is to be close to decisions and context.

Why join Invopop

• Real ownership: you research, decide, build, ship, and support your own Apps.

• Work closely with Sam Lown (founding CTO of Cabify) and a small, high-bar team.

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

• Full room to experiment: leveraging AI to the infinite, switching frameworks, databases, schemas, nothing is set in stone here—as long as you can justify why.

• No bureaucracy or politics: product, taste, and ideas win over anything else

Interview process

• Intro call (30 min)

• Take-home exercise

• Technical interview (1h)

• Final interview, in person (1h)

A meeting lands on your calendar

If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.