Senior Full Stack Developer

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 SQLDesign APIs and integrations that can handle high-load database operationsTune and optimize query performance across production environmentsImplement front-end features with TypeScript and ReactLeverage GenAI engineering tools to enhance development workflowsCoordinate with the team while independently delivering assigned workCommunicate early and often with teammates and stakeholdersOwn product features and contribute beyond simply completing ticketsOperate 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 SQLStrong expertise in web application engineering, API design, and third-party integrationsHands-on experience operating high-load databases and tuning query performanceWorking knowledge of TypeScript and React with readiness to contribute across front end and back endPractical experience with GenAI engineering tools, ideally Claude CodeExcellent communication skills and a proactive mindset, able to collaborate and self-directDemonstrated ability to execute amid ambiguity without constant guidance in a transparent, fast-moving startup environmentEnglish proficiency at B2 (Upper-Intermediate) level or higher Nice to have Strong exposure to TypeScript, React, Next.js, Storybook, Playwright, Radix UI, and ZustandExperience working with PostgreSQL and OpenSearchFamiliarity with cloud platforms, Infrastructure as Code, and related toolingData engineering background, including PySpark and SparkSQLClient-facing experience We offer We gather like-minded people:Top tech minds driving innovation in AI, cloud and digital platform modernizationSupportive team and agile, startup-like cultureHybrid by design mode and opportunity to work remotely within PolandChance to work abroad for up to 60 days annuallyBusiness-driven relocation opportunitiesWe provide growth opportunities:Career development programsThought leadership, mentoring, soft skills and well-being programsCertification (Anthropic, Gemini, GCP, Azure, AWS)English classesWe cover it all:Stable payParticipation in the Employee Stock Purchase Plan with a 15% discountBenefits package (health insurance, multisport, shopping vouchers)Referral bonuses up to $2,000Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and moreCorporate, social and well-being eventsPlease, note:Benefits listed above are available to employees onlyWe are open for working with Contractors. Terms of B2B cooperation agreements are agreed individuallyWe 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.