Senior Backend Engineer (Python) — Remote-First, AI & FastAPI

SplitMetrics; Barcelona; Remote; EUR 65,000 - 100,000; Full time

Benefits offered by this job

Time Off

Health Insurance

Conferences & Courses

Career Growth

Team Events

Remote-friendly

Office Hubs

Job summary

SplitMetrics is a global software company delivering an ecosystem of products that fuel growth for mobile-first businesses worldwide. We’re looking for a Senior Backend Engineer (Python) to join our team and design backend services in Python using FastAPI.

You will build async job execution with Redis/Celery/Kafka, integrate with LLM services, and maintain ETL pipelines, ensuring observability and cost‑efficient inference.

Qualifications

• 4+ years Python backend experience.
• Strong FastAPI experience.
• Solid PostgreSQL + S3 (or equivalents).
• Experience with async task queues (Celery, Redis, Kafka).
• Production experience integrating with microservices: long-running jobs, retries, failure handling.
• Hands-on agentic AI: MCP servers, agents, and working with various LLMs.
• Enthusiasm for agentic AI and field evolution.
• Observability skills: logging, monitoring, alerting.
• Experience in cross-functional teams (frontend, ML).
• Experience with AWS infra, Docker, Kubernetes.

Responsibilities

• Design and build backend services in Python (FastAPI).
• Implement async job execution and status tracking (Redis/Celery/Kafka).
• Integrate with LLM services (internal & external).
• Build and maintain external MCP servers exposing our platform to AI agents and clients.
• Develop ETL pipelines and ensure data quality across ingestion, transformation, and storage.
• Ensure stability, observability, and cost-efficient inference.

Skills

Python

FastAPI

PostgreSQL

Redis

Kafka

Celery

Docker

Kubernetes

AWS

LLM integration

Tools

PostgreSQL

Redis

Kafka

Celery

Docker

Kubernetes

AWS S3

Job description

SplitMetrics is a global software company delivering an ecosystem of products that fuel growth for mobile-first businesses worldwide. We’re looking for a Senior Backend Engineer (Python) to join our team and design backend services in Python using FastAPI.

You will build async job execution with Redis/Celery/Kafka, integrate with LLM services, and maintain ETL pipelines, ensuring observability and cost‑efficient inference.