Senior Python Engineer, Billing & Accounts
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Before you apply
LocationBarcelona, Spain
Work modehybrid
Typefull-time
SenioritySenior
Experience6+ yrs
DepartmentEngineering
Company size201–500 people
PostedAug 12, 2026 · 2mo ago
Verified live2d ago
At a glanceSummarised by Seekless from the posting.
6+ years of commercial Python development in production, with Python as your primary language and recent hands-on work
Strong expertise in modern Python frameworks (FastAPI preferred; Django or Flask are fine)
Solid experience designing and integrating APIs, including third-party services
Strong understanding of async programming and concurrency (AsyncIO, non-blocking I/O)
Experience with PostgreSQL and large datasets
Experience building and maintaining backend systems under production load, designed to last
Strong testing practices (unit and integration tests; PyTest preferred) and experience with CI/CD pipelines and Docker
Strong engineering judgment: ability to design systems end to end and make architectural decisions
Mentoring or leadership experience of any kind
Experience working in cross-functional teams, with clear communication and the ability to adapt when things change
Experience with billing, invoicing, or payment systems
Experience with PHP
Product mindset
Scale-up experience
Experience with queues, NoSQL, or analytical systems
Deep database experience, such as replication, partitioning, sharding, or PL/pgSQL
Hands-on experience with AI tools in your engineering work
Skills
Python
FastAPI
Django
Flask
AsyncIO
PostgreSQL
Docker
PyTest
PHP
NoSQL
PL/pgSQL
Benefits
Health insurance
Professional development
Flexible benefits
Hybrid work
Generous leave
Free meals
Relocation support
Sports activities
Team building events
WHO WE ARE 🌍
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.
WHO WE’RE LOOKING FOR 🌟
Want to build a system from scratch, and then watch a whole team rely on it?
As a Senior Python Engineer, Billing & Accounts, you’ll create the Python foundation for Manychat’s Billing. It’s a domain where the complexity is in the details: payments, payment provider integrations, anti-fraud, and local regulatory compliance, all tied to a pricing model that every feature depends on. You’ll build systems that handle failure gracefully, because they’re handling real money.
You’ll have real room to move. There’s no roadmap yet, so you’ll design systems end to end, make the architectural decisions, and experiment with what works best. Decisions move fast, and you’re trusted to make them. As new ventures and brands launch on top of Manychat, you’ll shape how Billing grows. Two mid-level engineers will join after you, and the foundation you lay is what they’ll build on. You’ll help them grow too.
Sound like your next challenge? Let’s talk!
YOUR FUTURE TEAMMATES 👋
We run Manychat under serious load, every day, and get it ready to handle even more. The stack is built for speed and durability, and we’re already working at the front of the AI era, not scrambling to catch up. We’re the ones who shape and own what gets built. 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.
WHAT YOU’LL DO 🚀
•
Design and build Billing’s Python foundation: the environment where product features and the existing PHP backend work together.
•
Set the direction while there’s no roadmap yet: experiment, make architectural decisions on your own, and design systems end to end.
•
Build async services for billing workflows: payments, payment provider integrations, invoicing, anti-fraud, and local regulatory compliance.
•
Design and integrate APIs, both internal and third-party, with clear and stable contracts.
•
Build for failure: retries, idempotency, consistency, and observability, so every payment is handled correctly.
•
Set the testing, CI/CD, and rollout practices this layer runs on, so the team can maintain, extend, and scale it after you.
•
Mentor and set the technical bar for the two mid-level engineers who join after you.
•
Work with cross-functional partners, so your technical decisions fit how the business actually runs.
•
Help Billing support the business as it scales and as new products and ventures launch on top of Manychat…
TO SHINE IN THIS ROLE 💥
You’ll need:
•
6+ years of commercial Python development in production, with Python as your primary language and recent hands-on work.
•
Strong expertise in modern Python frameworks (FastAPI preferred; Django or Flask are fine).
•
Solid experience designing and integrating APIs, including third-party services.
•
Strong understanding of async programming and concurrency (AsyncIO, non-blocking I/O).
•
Experience with PostgreSQL and large datasets.
•
Experience building and maintaining backend systems under production load, designed to last.
•
Strong testing practices (unit and integration tests; PyTest preferred) and experience with CI/CD pipelines and Docker.
•
Strong engineering judgment: you design systems end to end and make architectural decisions on your own.
•
Mentoring or leadership experience of any kind.
•
Experience working in cross-functional teams, with clear communication and the ability to adapt when things change.
Nice to have
It would be great if you have:
•
Experience with billing, invoicing, or payment systems.
•
Experience with PHP.
•
A product mindset and scale-up experience.
•
Experience with queues, NoSQL, or analytical systems.
•
Deep database experience, such as replication, partitioning, sharding, or PL/pgSQL.
•
Hands-on experience with AI tools in your engineering work.
WHAT WE OFFER 🤗
We care deeply about your growth, well-being, and comfort:
•
🌍 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.
•
🫶 Flexible benefits package tailored to your priorities.
•
🪴 Hybrid work and generous leave options for work-life balance.
•
🍽 In-office perks including free meals and snacks.
•
🤝 Company-funded sports activities, annual offsites, and team-building events.
Legal
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.