Senior Full-stack Developer (Databricks, Python/FastAPI)

Responsibilities

• Deliver and maintain web applications built with Python/FastAPI and SQL.
• Plan and design APIs and integrations that support high-load database operations.
• Optimize query performance across live production systems.
• Contribute UI functionality using TypeScript and React.
• Use GenAI engineering tools to improve development workflows and throughput.
• Collaborate closely with the team while executing autonomously on assigned tasks.
• Communicate proactively with team members and stakeholders.
• Take full ownership of product features and contribute beyond ticket completion.
• Handle ambiguity and consistently deliver in a fast-paced startup environment.

Requirements

• 5+ years of real-world production experience with Python, FastAPI, and SQL.
• Solid background in web application delivery, API design, and system integrations.
• Proficiency with high-load databases and query performance optimization techniques.
• Ability to contribute on the front end using TypeScript and React while staying effective full-stack.
• Experience using GenAI engineering tools, ideally Claude Code.
• Strong interpersonal communication and proactive collaboration skills, with ability to work independently.
• Capability to succeed amid ambiguity and deliver without constant direction in a transparent, fast-moving startup environment.
• English proficiency at B2 (Upper-Intermediate) level or higher.

Nice to have

• Hands-on skills with TypeScript, React, Next.js, Storybook, Playwright, Radix UI, and Zustand.
• Experience with PostgreSQL and OpenSearch in production contexts.
• Familiarity with cloud platforms, Infrastructure as Code, and adjacent tooling.
• Data engineering exposure, 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, AWS.
• English classes.
• Stable pay.
• Participation in the Employee Stock Purchase Plan with a 15% discount.
• Benefits package: 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 arrangements are available; terms of B2B cooperation agreements are agreed individually.
• Only selected candidates will be contacted.