Senior Backend Engineer

Hi 👋 We are Bïrch. Our product is a mighty toolbox for all the things creative and growth marketing teams do — content creation, collaboration, and ad campaigns, all in one place. We've been in the game for over 9 years, trusted by 800+ companies and more than 5,500 marketers. With billions in ad spend running through our platform, we're not just keeping up, we're one of Meta's fastest-growing partners and officially backed by both Meta and Google. Recently, we rebranded from Revealbot to Bïrch.

We’re moving from one successful product to a multi-product platform. Last year, together with Meta, we launched Bïrch Hub, a simple and friendly server-side tracking tool for ads, and we’re strengthening our backend team to support that growth. In this role, you won’t just maintain existing systems, you’ll help build new products and services, shape architecture together with the team, and contribute to key technical decisions while writing high-quality code across our dual-language backend (Ruby on Rails and Go).

🌍 Who are we?

We're a remote-first team of 35+ friends spread around the world with an HQ in Barcelona. We've built one successful product and now transitioning to a broader vision. We hire globally and love meeting offline: last two years we were in Barcelona, the year before in Istanbul. We are a spicy mix of different cultures and backgrounds.

🧑🎤 Who are you?

We're looking for a senior engineer who combines technical depth with a product mindset — someone who cares about the "why" just as much as the "how." You're comfortable owning complex systems and making architectural decisions on your own. You find smarter, simpler ways to solve problems instead of over-engineering, and once the team makes a call, you stand behind it fully.

✍🏼 What will you do?

You’ll be the sole backend engineer in a small product squad, working alongside a product manager, a frontend engineer, and a product designer, with full ownership of the backend side. Our platform handles billions in ad spend across Meta, Google, TikTok, and Snapchat, so reliability and quality of your work have a direct financial impact. Our stack is Ruby on Rails 8 and Go 1.25, with PostgreSQL 18, Redis, Sidekiq, and Docker under the hood. We deploy via GitHub Actions and monitor with Grafana, Prometheus, and Sentry.

How will you know you're doing well?

• After 3 months, you've shipped your first medium-sized feature end-to-end, are comfortable navigating the codebase, and are contributing meaningful code reviews.
• After 6 months, you're owning large features independently and contributing to architectural decisions.
• After 12 months, you're a trusted technical advisor for the backend team. You're driving system-level improvements and helping shape the technical roadmap.

🪩 What is our development process like?

In our team, engineers, product managers, and designers work in small product squads — small but mighty internal startups that fully own their part of the product.

• You have deep expertise in Ruby and Ruby on Rails. You understand how the framework works under the hood and write clean, idiomatic code.
• You're confident with Go. Our backend is a dual-language architecture: a Rails monolith and 20+ Go microservices. You'll work across both daily roughly 50/50.
• You have expert-level knowledge of PostgreSQL. Understanding indexing strategies, query optimisation, partitioning, and scaling.
• You have a DevOps mindset. You take responsibility for how your code runs in production. Our infrastructure includes EC2, Docker, Terraform and Ansible.
• You have a pragmatic relationship with AI tools.
• You take testing seriously.
• You're skilled in performance optimisation.
• You primarily communicate in English with your teammates.

Bonus points if you have:

• Experience with Ansible, Terraform, and AWS Stack
• Working experience in the AdTech/MarTech industries.

💝 What do we offer?

• A chance to help build a future unicorn.
• High autonomy and real ownership.
• No legacy technologies.
• Time to fix and improve tech debt.
• Competitive salary and various benefits:
  • 38 days of paid time off annually.
  • $2000 annual holiday travel bonus for tickets and accommodation.
  • $2000 annual Learn & Development budget.
  • $2000 annual bonus for meeting with your team in Barcelona or another country.
  • Full health insurance provided through Alan or SafetyWing.
  • Fully paid parental leave from 3 to 6 months.
  • Company's support in relocation to Barcelona if needed.
  • Laptop budget for the latest MacBook.
  • Regular team meet-ups and off-sites.
  • Remote-first or hybrid work arrangement in Barcelona.
  • Co-working budget.