Senior Backend Engineer

Sax AI
Municipality of Madrid, Spain
9 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Senior

Job location

Municipality of Madrid, Spain

Tech stack

API
Artificial Intelligence
Amazon Web Services (AWS)
Software as a Service
Software Quality
Software Debugging
DevOps
Django
Python
PostgreSQL
Redis
Software Engineering
Large Language Models
Backend
Information Technology
Celery
Terraform
Docker

Job description

  • Build and optimize AI agents for compliance workflows using Python and LLMs
  • Integrate with external data providers and with banks' internal systems
  • Architect async task pipelines for complex, long-running compliance checks
  • Develop APIs for the front-end application
  • Contribute to architectural decisions that enhance system performance and reliability
  • Write clean, maintainable, strictly-typed code that meets enterprise security and compliance standards

Tech Stack

  • Python with mypy, Django, Celery
  • PostgreSQL with pgvector, Redis
  • AWS, Docker
  • LLMs: OpenAI, Gemini

Requirements

  • 5+ years building backend systems in Python
  • Strong software design and architecture, and domain modeling
  • Experience designing APIs and with async/background job processing patterns
  • Strong problem-solving abilities and systematic debugging approach
  • Care about code quality, testing, and maintainability
  • Bachelor's degree in Computer Science, Engineering or related field

Nice to Have

  • Experience building enterprise SaaS applications
  • DevOps experience: Terraform, AWS, infrastructure-as-code, CI/CD pipelines
  • Financial services, KYC/AML, or regulatory compliance domain knowledge
  • Experience with agentic AI systems, document processing/OCR pipelines

Benefits & conditions

  • Build AI agents that automate days of analyst work into minutes, in a high-stakes financial domain
  • Work directly with investment banks on real compliance workflows
  • Shape the architecture of a complex AI system in a fast-growing startup with enterprise clients
  • A competitive salary with generous Stock Options.

Apply for this position