Senior Python Engineer (Billing)

Doist; Barcelona; Presencial; EUR 90.000 - 120.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Hybrid onboarding

Health insurance for family

Professional development budget

Flexible benefits

Hybrid work

Free meals and snacks

Annual offsites & team events

Descripción de la vacante

Manychat is seeking a Senior Python Engineer to design and evolve a Python-based platform layer that integrates with the core system. You will define patterns for service communication and orchestration while delivering scalable, async services for high-load workflows.

The role emphasizes API contracts, reliability, and observability, with close collaboration to align architecture with business goals and long-term platform scalability.

Formación

• 5+ years of commercial Python development in production environments.
• Strong expertise in modern Python frameworks (FastAPI preferred; Django/Flask acceptable).
• 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 high-load backend systems.
• Strong testing practices (unit and integration tests; PyTest preferred).
• Experience with CI/CD pipelines and Docker.
• Strong ownership and product mindset - align with stakeholders and business impact.

Responsabilidades

• Design and build a Python-based platform layer that integrates with the core system.
• Define and evolve patterns for service communication, orchestration, and responsibility split.
• Develop scalable, async services handling high-load and latency-sensitive workflows.
• Own API contracts between systems, ensuring stability and backward compatibility.
• Extract functionality from the core into scalable services where it improves performance.
• Ensure reliability of cross-system interactions through observability (monitoring, logging, tracing).
• Design for failure: retries, idempotency, consistency guarantees.
• Drive engineering quality: testing strategy, CI/CD, safe rollout practices.
• Collaborate with Platform and Product teams to align architecture with business needs.
• Contribute to long-term platform scalability, not just feature delivery.

Conocimientos

Python development

FastAPI

Django/Flask

Async programming

API design

PostgreSQL

Distributed systems

Testing with PyTest

CI/CD

Docker

Herramientas

Docker

Descripción del empleo

WHO WE ARE

We help creators get more out of every conversation with Instagram-focused automations and support for other channels like Messenger, WhatsApp, and TikTok. The result? Better engagement, more sales, and real, sustainable growth. With a diverse team of 350+ people across three continents, we’re building the leading Chat Marketing platform - trusted by more than 1.5 million customers worldwide. AI is one of our top strategic priorities. We’re building intelligent, production-grade systems that power conversations at scale - and we’re just getting started.

WHO WE'RE LOOKING FOR

We’re hiring a Senior Python Engineer to build and evolve a Python-based platform layer that extends and scales Manychat’s eng core. This is not a standalone backend. This layer acts as a bridge and execution environment for high-load, business-critical workflows that cannot be efficiently handled inside the core system. Your primary focus will be designing systems that:

• decouple and offload complexity from the core platform
• enable scalable execution of business logic
• provide reliable communication between services

This role is ideal for someone who:

• thinks in systems, not services
• understands trade-offs of distributed architectures
• can turn loosely defined problems into stable production solutions
• is comfortable working close to platform boundaries and constraints

WHAT YOU'LL DO

Design and build a Python-based platform layer that integrates with the core system. Define and evolve patterns for service communication, orchestration, and responsibility split between core and Python services. Develop scalable, async services handling high-load and latency-sensitive workflows. Own API contracts between systems, ensuring stability, backward compatibility, and clear boundaries. Identify and extract functionality from the core into scalable services where it improves performance or maintainability. Ensure reliability of cross-system interactions through observability (monitoring, logging, tracing). Design for failure: retries, idempotency, consistency guarantees. Drive engineering quality: testing strategy, CI/CD, safe rollout practices. Work closely with Platform and Product teams to align architecture with business needs. Contribute to long-term platform scalability, not just feature delivery.

TO SHINE IN THIS ROLE

You’ll need:

• 5+ years of commercial Python development in production environments.
• Strong expertise in modern Python frameworks (FastAPI preferred; Django/Flask acceptable).
• Solid experience designing and integrating APIs (including third-party services).
• Strong understanding of async programming and concurrency (AsyncIO, non-blocking I/O).
• 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.
• Strong ownership and product mindset - able to align with stakeholders and connect engineering work to business impact.

It would be great if you have:

• Experience working with loaded projects and queue systems.
• Skills working with infrastructure.
• Experience working with third-party API.
• Knowledge of different NoSQL solutions and analytical systems.
• Replication, partioning, sharding, PL/pgSQL, and other attributes of profound work with databases.

WHAT WE OFFER

• 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.

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.