UnderDefense is looking for a proactive and product-driven Python Developer to join our fast-growing product team and help build a new cybersecurity solution. This is not just a coding role — we’re looking for someone who wants to take ownership, influence decisions, and treat security as a product, not just a service.

You’ll be part of a team developing an intelligent, cloud-native platform for automating security incident response. If you care about building something meaningful, want to shape how modern cybersecurity is delivered, and grow alongside the product you’re helping create — this is your chance to make a real impact.

Our Tech Stack & Requirements:

• Python (asyncio): 3+ years of hands-on commercial experience;
• PostgreSQL, SQLModel / SQLAlchemy, Alembic: 1+ year;
• AWS (SQS, DynamoDB, S3, ECS/Fargate, Lambda, Cognito): 2+ years, including boto3 / aioboto3;
• FastAPI: 2+ years designing and building REST APIs;
• Testing (pytest, pytest-asyncio): 2+ years writing solid unit and integration tests;
• Docker, docker-compose: 2+ years;
• Event-driven microservices (SQS, NATS): 1+ year designing and building distributed systems;
• LLM / AI stack (LangChain, Langfuse, AWS Bedrock / AgentCore, Strands Agents, LiteLLM, MCP): 1+ year building LLM-based pipelines or agents;
• CI/CD (GitLab CI/GitHub Actions): 1+ year;
• Vector search (Weaviate/Chroma): hands-on experience;
• Observability (Sentry, OpenTelemetry): practical experience;
• English: Intermediate+, with strong communication skills.
  
  

Nice to Have:

• Kubernetes (EKS) and Helm;
• Infrastructure as Code: Terraform or AWS CDK;
• Kafka or other high-throughput streaming (Kinesis);
• LLM evaluation and guardrails (Ragas, DeepEval, prompt-injection defense);
  RAG optimization: hybrid search, re-ranking, pgvector;
• Background in cybersecurity or SOC tooling (SIEM, EDR, STIX).

Responsibilities:

• Design and build scalable, production-quality Python services;
• Write clean, testable code and contribute to a strong TDD culture;
• Participate in daily code reviews and agile rituals;
• Translate business requirements into architectural solutions and working software;
• Ensure high code quality with unit/integration testing;
• Collaborate with DevOps to manage scalable cloud infrastructure;
• Contribute to architectural decisions and tool selection;
• Write and maintain technical documentation.

What we offer:

• Outstanding product team; work in a global IT/Cybersecurity company, a pure Ukrainian Startup success story;
• Direct impact on product evolution;
• Decent base Compensation fixed in USD;
• Funny celebrations, team outings, and unforgettable corporate events;
• Compensation for sick leaves and regular vacations;
• Comfortable office or possibility to work remotely;
• Flexible working schedule;
• English classes compensation;
• Internal Medical coverage;
• The ability to attend conferences, webinars, and other events that will enhance your professional skills;
• Regular education and self-development on internal courses and seminars, office library, direct access to decision-makers.

Build something meaningful. Protect thousands of businesses. Let’s redefine cybersecurity together.