Senior Full-stack Developer (Python/FastAPI, React/TypeScript)

Required skills: Python, fastapi, SQL, React, TypeScript, PostgreSQL, API Design, Anthropic Claude We are building a new multi-cloud product and need a Senior Full-stack Developer to deliver Python/FastAPI services and React/TypeScript UI at scale. You will work with PostgreSQL, OpenSearch, and Databricks, improving performance and integrations across the stack. Apply now. Responsibilities Build and support web applications using Python/FastAPI and SQL Design APIs and integrations that can handle high-load database operations Tune and optimize query performance across production environments Implement front-end features with TypeScript and React Leverage GenAI engineering tools to enhance development workflows Coordinate with the team while independently delivering assigned work Communicate early and often with teammates and stakeholders Own product features and contribute beyond simply completing tickets Operate effectively in ambiguity and ship results in a fast-paced startup environment Requirements Proven track record with 5+ years of production work using Python, FastAPI, and SQL Strong expertise in web application engineering, API design, and third-party integrations Hands-on experience operating high-load databases and tuning query performance Working knowledge of TypeScript and React with readiness to contribute across front end and back end Practical experience with GenAI engineering tools, ideally Claude Code Excellent communication skills and a proactive mindset, able to collaborate and self-direct Demonstrated ability to execute amid ambiguity without constant guidance in a transparent, fast-moving startup environment English proficiency at B2 (Upper-Intermediate) level or higher Nice to have Strong exposure to TypeScript, React, Next.js, Storybook, Playwright, Radix UI, and Zustand Experience working with PostgreSQL and OpenSearch Familiarity with cloud platforms, Infrastructure as Code, and related tooling Data engineering background, including PySpark and SparkSQL Client-facing experience We offer We gather like-minded people: Top tech minds driving innovation in AI, cloud and digital platform modernization Supportive team and agile, startup-like culture Hybrid by design mode and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Career development programs Thought leadership, mentoring, soft skills and well-being programs Certification (Anthropic, Gemini, GCP, Azure, AWS) English classes We cover it all: Stable pay Participation in the Employee Stock Purchase Plan with a 15% discount Benefits package (health insurance, multisport, shopping vouchers) Referral bonuses up to $2,000 Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and more Corporate, social and well-being events Please, note: Benefits listed above are available to employees only We are open for working with Contractors. Terms of B2B cooperation agreements are agreed individually We will reach out to selected candidates exclusively EPAM is global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, we empower our clients to become AI-Native enterprises, driving measurable value from innovation and digital investments.