Hi there, we’re Upstream 👋

We love building products that people love using. We see a huge gap in the way teams communicate these days, and we’ve set out to reinvent efficient and productive messaging at work. We’re in this for the long haul and we want to build something phenomenal used by millions of people.

<aside> 🛋️ Read more about our story on our YC launch page

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We are hiring, check out our open positions!

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Get to know us

Louis (co-founder, CEO)

I love geeking out on products that drive daily habits for people. I’m at my best when I can spend the day with fun and talented builders, figuring out how to craft elegant product solutions to solve for seemingly impossible tradeoffs. Here is a mini-bio on where I’ve been:

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I was one of the early product people at Asana, driving growth and adoption up to $100M ARR. I went on to lead the entire product team at Algolia as their Head of Product through series B and C, assembling a team of 20+ talented product builders, while growing ARR 2.5x to $100M+. I also have super early stage experience from my time at AgilOne (now sold to Acquia) and have engineering degrees from Stanford in the US and Ecole des Ponts in France.

I lived in the US for about 10 years (a tiny bit in NYC, but mostly in San Francisco), and recently moved to Paris where I’m happily settled with my wife and 2 kids

Email me at [email protected]

Jon (co-founder, CTO)

I love building products with people who love building products! I enjoy working across the whole stack, and spending time getting every small detail in the experience right. Here’s a bit more about where I’ve been before:

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My love for software started when I was only a teenager: I developed Dino Gaia, one of the most popular online French consumer games in the 2000s, registering millions of visits every month. I've since built technical hands-on and leadership experience across multiple sectors: I was the first engineer at LeCab, where I built the whole tech stack and engineering team. I ventured into fintech as a Director of Engineering at HiPay, got a taste of consumer at PhotoBox, and was most recently the VP of Engineering at Doctrine before it got acquired.

I’m happily married and a proud father of my daughter and son, and when I’m not coding you can find me running in the streets of Paris!

Email me at [email protected]

Konstantin (Founding Engineer)

Building great products with smart, collaborative people is what keeps me excited about tech. I’ve had the privilege of working with some amazing teams to create products that people love to use every day. I’m always focused on the balance between the big picture and the finer details—because both matter. Here’s a bit more about my background and journey:

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I started programming at age 9 with QBasic (you can call it my first language), which sparked a lifelong passion for building impactful tech. Since then, I’ve had the thrill of helping startups bring products to life from the ground up, reaching millions of users along the way. Most recently, I worked at Yandex on an innovative education product for kids, creating new ways to make learning engaging and accessible.

I moved to Paris from Russia and now live here with my wife and baby daughter. When I’m not coding I’m traveling around Europe with my family.

Email me at [email protected]