Software Engineer, Backend (Warsaw)

Requirements

• Degree in Computer Science, Software Engineering, or equivalent practical experience.
• Proficiency in Python or another backend language (JavaScript/TypeScript, C#, Golang).
• Strong understanding of backend fundamentals: APIs, databases, caching, messaging systems and distributed architectures.
• Strong problem-solving abilities and attention to detail.
• Ownership mindset capable of shipping end-to-end features with minimal oversight.
• Excellent communication skills and collaborative attitude.
• Team-oriented, low-ego mindset and curiosity for learning.

Nice to Haves

• Front-end development (Typescript, React, NextJS...) or full-stack exposure
• Infrastructure management (Docker, CI/CD, Kubernetes, Helm, Terraform...)
• AI/ML engineering
• Observability and monitoring tools (Prometheus, Grafana, Datadog…)
• UX and product-centric mindset

What you'll be doing

• Backend Development
  • Design, develop and maintain scalable, robust backend features and APIs using modern frameworks.
  • Ensure high performance and reliability across our distributed systems.
• System Architecture
  • Design and implement efficient, secure and scalable architectures that support our fast-growing products.
  • Collaborate with infrastructure teams on deployment, monitoring, and performance optimization.
• Code Quality
  • Write clean, maintainable and well-documented code.
  • Participate in code reviews and contribute to technical standards and best practices.
• Cross-functional Collaboration
  • Work closely with product managers, front-end engineers, designers and data/AI engineers to deliver end-to-end features.
  • Partner with teams across different areas to build and enhance Mistral’s agent harness.
• Problem-Solving & Innovation
  • Tackle complex engineering challenges, from distributed systems to AI product integration.
  • Stay up-to-date with new technologies and bring them into production when relevant.

Perks and Benefits

• Introduction call - 45 min
• Live-coding interview - 45 min
• System Design interview - 45 min
• Hiring Manager interview - 30 min
• Deep Dive Interview (only for leads & staff engineers) - 60 min
• Culture-fit discussion - 30 min
• Reference checks