Senior Full-stack Developer, Python/FastAPI, React & SQL

We are launching a new multi-cloud product and need a Senior Full-stack Developer to own full-stack delivery from Python/FastAPI APIs to React/TypeScript UI. You will optimize PostgreSQL and OpenSearch performance and collaborate in a Databricks-heavy environment.

Responsibilities

• Develop and enhance web applications using Python/FastAPI and SQL
• Define and implement APIs and integrations that support high-load database operations
• Optimize and troubleshoot query performance in production systems
• Deliver front-end work using TypeScript and React
• Incorporate GenAI engineering tools to improve development workflows
• Work collaboratively while independently owning assigned tasks
• Maintain proactive communication with stakeholders and teammates
• Own features end to end and contribute beyond ticket completion
• Execute effectively through ambiguity in a fast-paced startup environment

Requirements

• Demonstrated 5+ years of production delivery with Python, FastAPI, and SQL
• Advanced knowledge of web application development, API design, and integration work
• Hands-on ability to operate high-load databases and optimize query performance
• Familiarity with TypeScript and React and willingness to work across the full stack
• Practical experience with GenAI engineering tools, ideally Claude Code
• Strong communication abilities and proactive ownership, comfortable working solo and with a team
• Track record of navigating ambiguity and shipping without constant direction in a transparent, fast-moving startup environment
• English proficiency at B2 (Upper-Intermediate) level or higher

Nice to have

• Experience with TypeScript, React, Next.js, Storybook, Playwright, Radix UI, and Zustand
• Experience working with PostgreSQL and OpenSearch
• Knowledge of cloud platforms, Infrastructure as Code, and related tools
• Data engineering experience using PySpark and SparkSQL
• Client-facing experience

We offer

• 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
• Career development programs
• Thought leadership, mentoring, soft skills and well-being programs
• Certification (Anthropic, Gemini, GCP, Azure, AWS)
• English classes
• 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.
• Contractors are welcome; terms of B2B cooperation agreements are agreed individually.
• Only selected candidates will be contacted.