Senior Full-stack Developer - Python/FastAPI & React/TypeScript

Responsibilities

• Create and maintain web applications with Python/FastAPI and SQL.
• Architect APIs and integrations to support high-load database workloads.
• Improve query performance throughout production systems.
• Deliver UI work using TypeScript and React.
• Apply GenAI engineering tools to streamline and improve developer workflows.
• Partner with teammates while owning and completing independent assignments.
• Share progress proactively with stakeholders and the wider team.
• Drive feature ownership and add value beyond ticket-by-ticket execution.
• Deliver outcomes despite ambiguity in a fast-paced startup environment.

Requirements

• Extensive experience of 5+ years delivering production systems with Python, FastAPI, and SQL.
• Deep understanding of web application development, API architecture, and integration patterns.
• Demonstrated ability to manage high-load databases and improve query performance.
• Comfort with TypeScript and React, plus willingness to work end-to-end full-stack.
• Hands-on use of GenAI engineering tools, ideally Claude Code.
• Clear communication skills with a proactive, ownership-oriented approach.
• Ability to handle uncertainty and execute without constant direction in a transparent, fast-moving startup environment.
• English proficiency at B2 (Upper-Intermediate) level or higher.

Nice to have

• Experience across TypeScript, React, Next.js, Storybook, Playwright, Radix UI, and Zustand.
• Working knowledge of PostgreSQL and OpenSearch.
• Exposure to cloud platforms, Infrastructure as Code, and supporting tools.
• Experience handling data via PySpark and SparkSQL.
• Client-facing experience.

We offer

• Hybrid-by-design work 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 opportunities: Anthropic, Gemini, GCP, Azure, and AWS.
• English classes.
• Stable pay.
• Participation in the Employee Stock Purchase Plan with a 15% discount.
• Benefits package, including health insurance, Multisport, and 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.
• Contractor engagements are available; terms of B2B cooperation agreements are agreed individually.
• Only selected candidates will be contacted.