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

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

• Hybrid-by-design work mode and the opportunity to work remotely within Poland.
• Opportunity 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.
• Certifications in 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 with entertainment and relaxation zones, table tennis, football, free snacks, coffee, and more.
• Corporate, social, and well-being events.

Benefits listed above are available to employees only.

Contractor cooperation is available; terms of B2B cooperation agreements are agreed individually.

Only selected candidates will be contacted.