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
SeniorJob 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.