--- title: 'Founding Solutions Engineer at Invopop' canonical: 'https://feeny.ai/job/founding-solutions-engineer-invopop-madrid-0khd58s5hbzp' type: 'job' last_seen: '2026-09-09' --- # Founding Solutions Engineer at Invopop - **Company:** Invopop - **Location:** Madrid, Spain - **Compensation:** €50k–€70k - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2026-05-26 - **Last confirmed live:** 2026-09-09 - **Apply:** https://jobs.ashbyhq.com/invopop/71321e92-cac2-48e4-befd-34bce4917188 ## Job description ## QUICK FACTS - We’re a global e-invoicing platform operating in 30+ countries - Revenue grew 10x last year and is on track to triple again this year to €3M ARR - Role: first dedicated post-sales hire. Own customer implementations end-to-end and build the post-sales function from scratch alongside the founders and engineering team - Looking for: 2+ years of experience in technical, customer-facing, or implementation roles. Strong coding fundamentals, clear communication, and high ownership - Compensation: €50–70k + ESOP - Based in Madrid, working in person from our office in Madrid -- Over the last few years, we’ve built a product customers genuinely love. More than 200 companies have implemented Invopop using only our API docs and support channels. As we move upmarket, larger enterprises need more hands-on technical support to design, build, and launch their integrations successfully. That’s why I’m looking for a Founding Solutions Engineer to help us build the post-sales function from scratch. You’ll work directly with engineering teams at some of the world’s fastest-moving tech companies to get them live across multiple countries. You’ll debug integrations, answer hard technical questions, design rollout plans, and help customers move from signed contract to production launch. You should be technical enough to read logs, reason about integration architecture, and write quick scripts when needed — but also pragmatic, organized, and comfortable working directly with customers. You’ll report directly to me initially and, over time, help shape how implementations and technical onboarding work at Invopop. ## ABOUT INVOPOP Invopop helps global companies like Qonto, Hyundai, and DeepL issue and receive invoices across more than 30 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 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) ## About Invopop ## Company Overview - **One-liner**: Invopop provides a single API for global e-invoicing and tax compliance, automating the conversion of sales data into locally compliant e-invoice formats for over 25 countries. - **Entity Type**: Private (Startup, Y Combinator W23 batch) - **Headquarters**: Madrid, Spain (with a second office in London, UK) - **Founded**: 2020 (Y Combinator profile lists 2021) - **Founders**: Sam Lown (Co-founder & CTO, previously Co-founder & CTO of Cabify) and Juan Moliner Malaxechevarría (Co-founder, previously a consultant at BCG) ## Core Business - **Primary industry/industries**: E-Invoicing, Sales Tax/VAT Compliance, Fintech, B2B SaaS - **Target customers**: B2B; global software companies, fast-growing companies, and enterprises that need to issue compliant invoices across multiple jurisdictions (e.g., SumUp, Fever, DeepL). - **Mission or purpose statement**: "Help us make invoicing great again" and "Simplify Sales Tax/VAT compliance, globally." ## Products & Services - **Invopop API**: A single API that receives sales transaction data in a simple, open-source format (GOBL) and converts it to locally compliant e-invoices. This includes syncing with tax authorities for real-time reporting (e-invoicing), generating custom-branded PDF invoices, and integrating with the company’s existing stack (ERP, billing, payments, reconciliation). - **GOBL (Global Open Business Language)**: An open-source, global invoice format that Invopop is "proudly built on," designed to standardize invoice data across different countries. ## Market Standing - **Valuation/Market Cap**: Not publicly available (private startup). - **Key Metric**: Total Funding — Not publicly disclosed beyond being a Y Combinator-backed company (Winter 2023 batch). The Y Combinator profile lists a standard SAFE note with a valuation cap range (0.10% - 1.00%). - **Notable Investors/Partners**: Y Combinator (W23 batch). The company website also lists individual angel investors including Maex Ament (Co-founder of RevenueCat), Jeff Epstein (Former CFO of Oracle), Mark Villacampa (Co-founder of Cabify), and others. - **Growth Signals**: - Trusted by global companies like SumUp, Fever, and DeepL. - Live in Colombia, Spain, Portugal, and many more countries coming soon (Mexico, Italy, Peru). - Team size is listed as 7 on Y Combinator (likely at time of batch) and 17 total employees on Built In, indicating recent growth. - The company is positioned to capitalize on a massive regulatory tailwind: over 40 countries (including all EU member states) will require real-time e-invoicing in the next 1-5 years. ## Competitive Advantages - **Single API for global compliance**: Instead of building and maintaining numerous local integrations, companies integrate once with Invopop, saving significant time and engineering resources. - **Open-source foundation (GOBL)**: By building on an open standard, they reduce vendor lock-in and foster a community around their format, making it easier for partners and customers to adopt. - **Founder-Market Fit**: Co-founder Sam Lown experienced the e-invoicing "nightmare" firsthand as CTO of Cabify during its expansion into Latin America, giving the team deep, first-hand knowledge of the problem. - **Y Combinator Backing**: Provides credibility, network, and access to a global community of startups. ## Strategic Focus - **Global Expansion**: Rapidly adding support for new countries (Mexico, Italy, Peru, etc.) to stay ahead of the regulatory curve. - **Product Development**: Building out the platform to handle more complex compliance scenarios and deeper integrations with customer stacks. - **Talent Acquisition**: Actively hiring for key roles (VP of E-invoicing Compliance, Staff Backend Engineer, Founding Solutions Engineer, Founding Marketer) to scale the team and product. ## Why Work Here - **High-Impact Problem**: Work on a critical infrastructure problem that is becoming a global necessity for any company doing cross-border business. - **Strong Founding Team**: Learn from experienced founders who have built and scaled a unicorn (Cabify). - **Culture & Values**: The company emphasizes values like "Seek Honesty" and "Build," fostering a team of "curious, kind, and ambitious builders" [invopop.com]. - **Work Model**: Hybrid (with offices in Madrid and London). The Built In profile notes "OnSite Workspace" with employees working from physical offices, but job postings also indicate a hybrid model. - **Compensation**: Y Combinator profile lists salary ranges for roles (e.g., €50K - €140K EUR) plus significant equity (0.10% - 1.00%), which is typical for an early-stage, high-growth startup. - **Engineering Culture**: Focus on backend product engineering with a modern tech stack (GOBL, API-first). The team is small (7-17 people), offering significant ownership and impact. ## Sources 1. [invopop.com](https://www.invopop.com/) 2. [invopop.com/about](https://www.invopop.com/about) 3. [invopop.com/careers](https://www.invopop.com/careers) 4. [ycombinator.com/companies/invopop](https://www.ycombinator.com/companies/invopop) 5. [builtin.com/company/invopop](https://builtin.com/company/invopop) ## Other roles at Invopop - [Sales Development Representative](https://feeny.ai/job/sales-development-representative-invopop-madrid-c75yk8nrpj9g) — Madrid, Spain - [Staff Backend Product Engineer](https://feeny.ai/job/staff-backend-product-engineer-invopop-madrid-9s4pexef99vk) — Madrid, Spain - [Backend Product Engineer](https://feeny.ai/job/backend-product-engineer-invopop-madrid-dvhsq8be0pna) — Madrid, Spain - [Graduate Product Engineer](https://feeny.ai/job/graduate-product-engineer-invopop-madrid-t75mnbpne8nt) — Madrid, Spain - [Founding Solutions Engineer](https://feeny.ai/job/founding-solutions-engineer-unblocked-vancouver-snc13gnp9y2f) — Vancouver, Canada