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

About the Position

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. Apply today.

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 Anthropic Claude
• 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

We gather like-minded people: 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.

We provide growth opportunities: Career development programs, thought leadership, mentoring, soft skills, and well-being programs. Certification (Anthropic, Gemini, GCP, Azure, AWS). English classes.

We cover it all: 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. We are open for working with Contractors. Terms of B2B cooperation agreements are agreed individually. We will reach out to selected candidates exclusively.