Senior Full-stack Developer (Python/FastAPI, React/TypeScript)

Responsibilities

• Build and support web applications using Python/FastAPI and SQL.
• Design APIs and integrations that can handle high-load database operations.
• Tune and optimize query performance across production environments.
• Implement front-end features with TypeScript and React.
• Leverage GenAI engineering tools to enhance development workflows.
• Coordinate with the team while independently delivering assigned work.
• Communicate early and often with teammates and stakeholders.
• Own product features and contribute beyond simply completing tickets.
• Operate 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 SQL.
• Strong expertise in web application engineering, API design, and third-party integrations.
• Hands-on experience operating high-load databases and tuning query performance.
• Working knowledge of TypeScript and React with readiness to contribute across front end and back end.
• Practical experience with GenAI engineering tools, ideally Claude Code.
• Excellent communication skills and a proactive mindset, able to collaborate and self-direct.
• Demonstrated ability to execute amid ambiguity without constant guidance in a transparent, fast-moving startup environment.
• English proficiency at B2 (Upper-Intermediate) level or higher.

Nice to have

• Strong exposure to TypeScript, React, Next.js, Storybook, Playwright, Radix UI, and Zustand.
• Experience working with PostgreSQL and OpenSearch.
• Familiarity with cloud platforms, Infrastructure as Code, and related tooling.
• Data engineering background, including 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 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.