Fullstack Software Engineer
Company:Siena AI
Location:Poland
Languages:English
Seniority level:Middle, 3+ years
Experience:3+ years
Skills:
AWSBackend DevelopmentNode.jsPostgreSQLSoftware DevelopmentCloud ComputingExpress.jsFrontend DevelopmentFull Stack DevelopmentTypeScriptRedisReactCI/CDDevOpsMicroservices
Requirements:
3+ years building in Node.js, React, TypeScript, and Express. Strong with PostgreSQL, Redis, and cloud environments (AWS: Fargate, Lambda, EC2, SQS). Familiar with CI/CD (CodePipeline, GitHub Actions, or similar). Experience with microservices and scalable systems. Product-driven—you care about the impact of what you ship, not just the code. AI-first—you live in Cursor, Claude Code and are comfortable orchestrating coding agents. Naturally curious and proactive; you don’t wait for instructions, you create momentum.
Responsibilities:
Design, build, and maintain scalable features across the full stack (frontend, backend, and infra). Collaborate with Product to break down scope into iterative, high-impact releases. Integrate cutting-edge LLM capabilities into real enterprise workflows. Solve complex engineering challenges, from optimizing API performance to refining microservices architecture. Maintain and improve our cloud infrastructure (AWS) with a DevOps mindset. Exercise high agency and ownership—taking initiative, making decisions, and driving ideas to production.
