Software Engineer, Backend (Go/Python)

Altan; Barcelona; Presencial; EUR 45.000 - 65.000; Jornada completa

Descripción de la vacante

A technology company in Barcelona seeks a backend developer to build scalable systems for an AI-driven SaaS product. You will work closely with the CTO, optimizing databases and implementing APIs in a fast-paced environment. The ideal candidate has expertise in Go and Python and at least 3 years of experience in backend development. This role emphasizes high ownership and continuous learning, allowing for real impact from the start.

Servicios

Continuous learning budget

High ownership

Fast feedback loops

Formación

• 3+ years building production backends.
• Experience with Go and Python for tooling and testing.
• Strong database design skills, particularly in PostgreSQL.

Responsabilidades

• Build scalable backend systems for SaaS generation.
• Design and implement REST/GraphQL APIs.
• Architect microservices for multi-tenancy and billing.

Conocimientos

Go expertise

Python expertise

PostgreSQL optimization

Microservices architecture

Docker knowledge

Kubernetes know-how

Clear communication

Herramientas

GCP

Redis

RabbitMQ

Descripción del empleo

About Altan

We recently raised a 2.5M pre seed and we are building something we are genuinely excited about with a small, ambitious, really cool team in Barcelona.

Imagine the world’s best team made by AI.
The best designer.
The best engineer.
The best operator.
All working together for you on demand.

Until now software was made by humans for humans. Two bottlenecks: dev teams that build it and ops teams that run it.
Altan removes both by coordinating a team of AI agents that design, create, and operate software on production grade infrastructure.
Software made by agents for agents.

About the role

Own and ship the backend backbone that powers agent-driven SaaS at scale—robust APIs, multi-tenant services, orchestration, and automation. You’ll work directly with our CTO and a small group of experienced engineers, make architecture decisions, ship fast, and join client-facing technical deep dives when needed.

What you’ll do

• Build scalable, high-performance backend systems for SaaS generation
• Design and implement REST/GraphQL APIs for the web builder & deployment pipeline
• Architect microservices for multi-tenant hosting, billing, and user management
• Optimize PostgreSQL and implement Redis caching strategiesCreate deployment automation and CI/CD pipelines for customer SaaS products
• Collaborate across frontend/DevOps to ensure seamless product experiences
• Join client-facing technical deep dives and solution architecture sessions

What you’ll3n

• 3+ years building production backends
• Go and Python expertise (tooling, testing, packaging)
• GCP + containers: Docker, Kubernetes (GKE/Cloud Run)
• Strong database design + SQL optimization (PostgreSQL)
• Distributed systems basics: idempotency, retries/backoff, consistency
• Messaging/EDA: queues/streams (e.g., GCP Pub/Sub, Kafka/RabbitMQ/NATS)
• SaaS patterns: multi-tenancy, billing, authentication/authorization
• Clear communicator; strong problem-solving and ownership

Why Altan

High ownership, fast feedback loops, and the chance to shape the architecture of a new category: software built and run by AI agents. Continuous learning budget and real impact from week one.

This role is for you if

• You like clear goals, fast cycles, and ownership
• You are happy to ship version one today and make it better tomorrow

This role is not for you if

• You prefer long planning cycles and layers of approval
• You are uncomfortable switching between strategy and execution in the same day