Senior Full-stack Developer (PostgreSQL, OpenSearch, Databricks) w Poland, Katowice

We are building a new product across multiple clouds and are hiring a Senior Full-stack Developer to ship Python/FastAPI backend and React/TypeScript front-end features. You will work with PostgreSQL, OpenSearch, and Databricks while improving integrations and performance. Apply now. Responsibilities Implement and maintain web applications with Python/FastAPI and SQLCreate APIs and integrations that support high-load database operationsAnalyze and optimize query performance across production systemsBuild front-end components using TypeScript and ReactAdopt GenAI engineering tools to improve development workflowsCollaborate with the team while progressing autonomously on your assignmentsCommunicate proactively with team members and stakeholdersOwn product features and drive impact beyond ticket completionDeliver results while navigating ambiguity in a fast-paced startup environment Requirements Proven 5+ years of production experience with Python, FastAPI, and SQLComprehensive expertise in web apps, API design, and integration developmentStrong capability in high-load database handling and query performance optimizationExperience with TypeScript and React, plus willingness to work full-stackHands-on exposure to GenAI engineering tools, ideally Claude CodeEffective communication skills and proactive execution, able to operate independently and as part of a teamAbility to deal with ambiguity and deliver without constant direction in a transparent, fast-moving startup environmentEnglish proficiency at B2 (Upper-Intermediate) level or higher Nice to have Solid experience with TypeScript, React, https://jobeax.com/link/Z30sZYC3jcRenVso, Storybook, Playwright, Radix UI, and ZustandExperience with PostgreSQL and OpenSearchFamiliarity with cloud platforms, Infrastructure as Code, and related toolsBackground in data engineering with 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.