Senior Python Engineer, Brands Barcelona, Barcelona, Spain en Barcelona, España

Senior Python Engineer, Manychat for Brands

Barcelona, Barcelona, Spain

Creating content that resonates is great — turning that attention into growth is even better. That's what Manychat does.

Our AI-powered automations help creators and brands engage with audiences across Instagram, Messenger, WhatsApp, and TikTok — at the right moment, with the right message, minus the manual work.

We're 400+ people across three continents behind the leading platform for conversational growth, with AI skills shaping how we build, how we work, and how we grow.

You've built backend systems at real scale before — you know what breaks under load and how to design around it early. You make the call on a fuzzy problem, defend it, and adjust as you go, with an entrepreneurial streak that thrives on building something from scratch. You want a direct line to the people using what you build and you judge your work the way they do: by whether it actually moves the metric.

We've built Manychat into the #1 chat platform. Now we're moving forward and building a new product, Manychat for Brands, from scratch: architecture, infrastructure, all of it. We shape what gets built and talk to our users directly — code quality matters, but the real impact we make for our customers matters more. As the product grows, you grow with it, with room to lead your own scope.

• Build Manychat for Brands from the ground up — the product brands use to run campaigns with creators: inviting them, handling consent, connecting their automations and data. Small codebase, early days.
• Ship to real design partners in your first weeks. You're in the partner channels, you see it break, you fix it — no layers between you and the user.
• Own problems that aren't solved yet: observability from zero, migrating off fragile infra, cutting PHP dependencies, auth and permissions, scaling data pulls that are already slow.
• Decide how things get built. The team's small, so you set the patterns the next engineers inherit.
• Shape what gets built with PMs and leadership — the product's still taking shape, so your calls move the product itself, and the code.
• Build on Manychat's production infrastructure, serving millions of users — real scale from day one.
• Judge your work by whether it lands for brands and creators — watch the metrics as closely as the code.

You'll need:

• 8+ years building backend systems in Python.
• Deep FastAPI experience (or a similar modern framework) — designing services and data models, not just endpoints.
• Experience designing systems and defending the trade-offs: boundaries, what to build now vs later, where it'll hurt.
• Experience building for real load — knowing what breaks at scale and how to avoid it.
• Comfort operating before a clear spec exists, helping shape the product as it comes together.
• A track record of working directly with product and partners, making your own calls, and tracking whether what you ship moves the metric.
• Experience building something from scratch — or the itch to finally do it.

We care deeply about your growth, well-being, and comfort:

• Hybrid onboarding to start work remotely and relocation support for you and your family.
• Comprehensive health insurance for both you and your family.
• Professional development budget for conference tickets, online courses, and other relevant resources to help you grow.
• Flexible benefits package: no one-size-fits-all perks here. You get a budget and you decide where it goes, from health and wellbeing to family and setting up your home office.
• Hybrid work and generous, flexible time off — planned with your team, not rationed by a rigid quota.
• Work from where you need to — agreed with your team, not tied to a desk. Flexibility we built in on purpose, because location shouldn't get in the way of great work.
• In-office perks, including free meals and snacks.
• Company-funded sport activities, annual offsites and team-building events.
• AI isn't a perk here — it's how we work. Claude, OpenAI, and more are on by default from day one, and we back teams in adopting whatever makes them faster.

Manychat is an Equal Opportunity Employer. We're committed to building a diverse and inclusive team. We do not discriminate against qualified employees or applicants because of race, color, religion, gender identity, sex, sexual preference, sexual identity, pregnancy, national origin, ancestry, citizenship, age, marital status, physical disability, mental disability, medical condition, military status, or any other characteristic protected by local law or ordinance.

This commitment is also reflected through our candidate experience. If you have individual needs that may require an accommodation during the interview process, please indicate this in your application. We will do our best to provide assistance throughout your interview process to ensure you're set up for success.