WHO WE ARE Creating content that resonates is great — turning that attention into growth is even better. 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.

Billing's own Python layer. Billing runs entirely on PHP today, and it works.

But Manychat is entering a multiproduct chapter: new ventures and brands are launching on top of the core platform, and Billing has to carry that weight. It's a foundation that doesn't exist yet — a Python layer built to carry payments, billing, anti-fraud, and compliance logic at scale. You'll be the first engineer on it, which means you set the patterns, the standards, and the judgment calls, and shortly after, you'll mentor two engineers who join to build alongside you.

We run Manychat under serious load, every day, and get it ready to handle even more. You'll do that work alongside a team that already moves fast, holds a high bar, and has each other's backs when it counts. Design and build Billing's first Python layer: the bridge between product features and the existing PHP core.

Define the patterns for service communication, orchestration, and how responsibility splits between Python and PHP. Build scalable, async services for high-load, latency-sensitive billing workflows: payments, invoicing, anti-fraud, and regulatory compliance. Identify functionality worth extracting from the PHP core into Python services where it improves performance or maintainability.

Set the testing strategy, CI/CD, and rollout practices this layer will run on, since you're the one building them from scratch.



Help shape how Billing supports new products and ventures being built on top of it. First 3 months: you understand the PHP core, Billing's constraints, and Product's existing Python layer well enough to make confident calls, and the first pieces of Billing's own layer are in production.

By end of year: the foundation is handling real billing traffic, and you've helped bring the first two engineers onto the team.

Beyond: Billing's Python layer is the reference pattern other teams build on, and your judgment is why it holds up. 8+ years of commercial Python development in production environments, including recent hands-on work. ~ Strong expertise in modern Python frameworks (FastAPI preferred; Django/Flask fine). ~ Experience working with PostgreSQL and large datasets. ~ Experience building and maintaining high-load backend systems. ~ Strong testing practices (unit and integration tests; PyTest preferred). ~ Experience with CI/CD pipelines and Docker. ~ It would be great if you have: Experience working with money: billing, invoicing, or payment systems. PHP experience.

Experience with loaded projects and queue systems. Replication, partitioning, sharding, PL/pgSQL, and other marks of serious database work. Hybrid onboarding to start remotely and relocation support for you and your family.

Comprehensive health insurance for you and your family. Professional development budget for conferences, courses, and learning resources. Hybrid work and generous leave options for work-life balance. In-office perks including free meals and snacks.

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.

📌 Founding Python Engineer, Billing & Accounts (Barcelona)
🏢 Manychat
📍 Barcelona