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Senior Backend Engineer – Python & AI
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About the role

We are looking for a
Senior Backend Engineer
to join an
AI Engineering team
within a large international technology environment.

In this role, you will design, build, and operate robust
Python backend services
that power
AI-enabled applications
and reusable engineering capabilities across a complex
enterprise ecosystem
.

This is a highly hands-on
senior individual contributor
position, focused on solving real
production challenges
, making sound
architectural decisions
, and turning
AI and data-science capabilities
into secure, reliable, scalable, and maintainable software.

You will take ownership of
backend services
from initial
design
through
production operation
, working closely with
Data Scientists, Product Managers, Platform Engineers, Security Specialists, and Architects
.

If you enjoy building
production-grade Python services
, designing
APIs
and
distributed systems
, working with
AWS
, and integrating
AI/LLM capabilities
into real-world applications, this could be a great fit.

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What you’ll do

? Design, build,



and maintain scalable
backend services
and
APIs
using
Python

? Own
backend services
end-to-end, from
architecture
and
implementation
through
deployment
and
production operation

? Integrate
AI models
,
Large Language Models (LLMs)
, and
Machine Learning services
into
production systems

? Define
service boundaries
,
data models
,
persistence strategies
, and
integration contracts

? Design resilient
distributed systems
with appropriate
failure handling
,
retries
,
fallbacks
,
rate limits
, and
asynchronous processing

? Work with
relational databases
,
data modelling
,
schema evolution
, and
persistence strategies

? Deploy and operate
backend services
in
AWS cloud environments

? Design services with
reliability
,
security
,
observability
,
performance
, and
cost
in mind

? Handle production
AI concerns
such as
latency
,
structured outputs
,
sensitive data
,
model failures
, and
exte

📌 Senior Python Backend Engineer (Barcelona)
🏢 Capitole
📍 Barcelona