In the next five years, more than 40 countries, including the entire EU, will mandate that businesses send invoices electronically in XML format and report them in real time 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, 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 Founding Solutions Engineer

Your job is simple: help customers launch successfully with Invopop.

This includes:

• Owning Enterprise customer onboarding from contract signature to production launch

• Working directly with customer engineering teams to design and debug integrations

• Help customers think through rollout plans and implementation approaches

• Answer technical questions during the sales process alongside the commercial team

• Improve API docs and build ERP connectors based on your learning

• Build the playbook for implementations and technical onboarding

Who we're looking for

Must-have:

• 2+ years of experience as software engineer or post-sales technical support

• Excellent written and spoken English

• Comfortable reading API docs, logs, HTTP requests, and JSON/XML payloads

• Able to write code or scripts when needed

• Strong communication, ownership, and structured thinking

• Comfortable working directly with customers and driving projects forward

Nice to have:

• Familiarity with fintech, ERP, billing, tax, or compliance systems

• Spanish

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

• World-class team: Work alongside experienced founders and builders, including Sam Lown, co-founder and former CTO of Cabify

• A true founding role: Help define our post-sales function as we scale globally

• Big upside and great setup: Competitive salary, meaningful ESOP, top equipment, flexibility, and a beautiful office in Madrid.

Interview process

The process has five steps:

• Step 1: Screening call

• Step 2: Intro call with Juan (30 min)

• Step 3: Take-home exercise

• Step 4: Deep-dive interview with Sam (1h)

• Step 5: In-person interview with both founders (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.