Co-founder CEO H/F
Sales Co-founder CEO H/F
At OSS Ventures we're looking for a Sales Co-Founder to join one of our future ventures.
Meet your team
TL;DR
Position also known as: Co-founder CEO
Location: Paris (regular on-site presence required for the first 9 months)
Salary range: Unpaid; founders share 75% equity, OSS retains 25%
Type of Contract: Founder equity agreement
Start date: As soon as possible
Companies Introduction
Our Ambition
We are reinventing the manufacturing world with software. OSS Ventures partners with bold entrepreneurs to build B2B SaaS companies that solve the hardest problems in industry.
Our Mission
To identify real industrial pain points and turn them into fast-scaling companies. From idea to €500k ARR in less than a year.
Our Story
Since 2019, we’ve launched 22+ ventures. Some failed, many thrived. Each cycle made our playbooks sharper and our founders stronger.
Our Values
Trusting team excellence
Fail, learn, succeed
We eat what we kill
Compound the system
Build something the world needs
Think and do it quick
Our Team
You won’t be alone: you’ll co-found with a CTO, and work daily with OSS experts in product, tech, growth, HR, design, and fundraising.
Why we need you
What you will do
Lead the venture commercially and strategically. Drive customers, revenue, and fundraising, while building a team and a culture that lasts.
In a nutshell
Validate the problem & opportunity.
Close first customers fast.
Get to €500k ARR in <12 months.
Fundraise for 18 months of runway.
Recruit and lead a mission-driven team.
Broadly speaking
You’ll own customer discovery, drive revenue, lead fundraising, shape company culture, and position the company for scale.
On a day-to-day basis
Meet customers, pitch, sign contracts, run experiments, recruit, and align the team on the next big milestone.
Who you’ll be working with
Your CTO co-founder, leading product & tech.
OSS core team: product, tech, growth, HR, design, VC experts.
Industrial partners: our network of factories, corporates, and early adopters.
Your profile to make this a success
Mandatory required skills
Leadership: 5+ years in senior roles (CEO, VP Sales, Country Manager, or founder).
Sales & Revenue: 3+ years managing complex B2B SaaS sales, proven track record in hitting ambitious targets.
Fundraising: Experience raising VC or angel rounds end-to-end.
Market Insight & Strategy: 4+ years analyzing markets, shaping GTM strategies.
Team Management: 5+ years recruiting, leading, and growing high-performing teams.
Language: Fluency in English
This will be important in your job, we’ll teach what you currently miss
Industrial vertical knowledge, and OSS fundraising tactics.
We kindly advise you to think twice before applying if…
You’re not location-flexible for Paris during the first 9 months.
You’re not entrepreneurial by nature.
You’re not looking for a positively challenging role.
You’re uncomfortable working in both French and English.
Overall Expected Behaviors
Speed over perfection.
Transparent communication.
Hands-on leadership.
Resilience and adaptability.
What success looks like
Successful pre-seed/seed raise.
A strong first team in place.
An independent, scalable venture ready for Series A.
Working conditions
Paris-based (75003)
Full-time, in-person for the first 9 months.
Intense but balanced: founders are expected to lead by example, but we support sustainable performance.
Process interview
Intro OSS – OSS Revenue Manager (1h).
Business Case (Sales) – OSS CRO (1.5h).
Leadership & Soft Skills – OSS People Partner (1h).
Final Business Case – OSS Partners (2h).
FAQ
Q: Am I a founder or a hire at OSS?
A: You’re a founder, not an employee. That’s the big difference.
At OSS, we don’t hire CEOs or CTOs. We build companies with them. You’ll co-own the strategy, mission, and vision of the company with your co-founder. Whether you’re CEO (sales-driven) or CTO (tech-driven), your role goes way beyond “just sales” or “just code.” You’re building a company, not just a function.
Q: How does equity work at OSS?
A: Founders split 75% equity (usually 50/50 between CEO & CTO), and OSS retains 25%.
We believe in true partnership, which means an equal split between co-founders. No “founding engineer” equity packages that dilute away — you’re a co-owner from day one
Q: Do I get a salary while building?
A: No. At OSS, you don’t get paid during the first months in the studio.
Instead, you focus entirely on building traction and raising your first seed round (with our support) to fund yourself and your team. Think of it as maximum alignment: if you succeed, you create a company with strong early revenues and fundraising momentum.
Q: What support do I get from OSS?
A: You’re not alone. You get:
A core team in product, growth, HR, design, and fundraising.
Playbooks refined across 20+ ventures (revenue, product-market fit, hiring, etc.).
Access to mentors (experienced CEOs & CTOs) who’ve done it before.
A network of industrial clients ready to test and adopt your product.
Hands-on help with fundraising, recruitment, and go-to-market experiments.
Q: What about customers? Do I have to find them myself?
A: We help you get users fast.
Instead of over-building in a vacuum, you’ll ship an MVP in the first months and test it directly with our network of design partners and early adopters. Our GTM experts run weekly experiments to accelerate acquisition and feedback.
Q: How is my startup de-risked?
A: OSS has launched 20+ ventures, and we’ve seen patterns repeat.
We validate ideas with market research before building. We provide benchmarks, fundraising decks, hiring pipelines, and frameworks for early decisions. That means you avoid costly mistakes and learn from proven approaches.
Q: Why join OSS instead of going solo?
A: You could go alone, but at OSS you:
De-risk your startup.
Get faster to revenue & fundraising.
Build alongside a community of founders facing the same challenges.
Have a partner (your co-founder) and a support team from day one.