Senior Backend Engineer (Kotlin / Java)

About Fourthwall Creatives, brands and startups run shops, memberships and donations on Fourthwall, on their own domain and with their own data. MKBHD, Y Combinator, The

Primeagen, Coffeezilla, Acquired, Vox and the Smithsonian are among them. More than 500,000 creatives and companies use it. Investors: Lightspeed, Initialized Capital and Seven Seven Six.

Offices in Los Angeles and Poznań. Company: Fourthwall, a product company. You contract with us directly.

Level: Senior individual contributor. Kotlin or Java in production qualifies; the work is in Kotlin. Location: Remote in Poland.

Meeting in Poznań from time to time is a plus, not a requirement. Hours: Your own, with agreed overlap with the team. On-call: Part of the role.

You join the backend rotation. Rate: 22,500 to 38,000 PLN net per month on B2B (invoice amount excluding VAT), long-term. Stack: Kotlin, Spring Boot, jOOQ on PostgreSQL, Arrow, Google Cloud, Codex / Claude Code.

Process: Intro call, paid exercise of about three hours, 75 minutes with the team, decision within five working days. About the product and culture Our promise is that we will make creating and selling products as easy as having a great idea. To deliver on that promise, our product must be comprehensive, including handling product design, manufacturing, shipping, ecommerce platform, customer support, and taxes.

The only way to do that is with a superstar team who want to work hard, own large areas of responsibility, and who care deeply about mak