Senior Full-stack Developer

EPAM Systems; Warszawa; Hybrid; PLN 190,000 - 270,000; Full time

Job description

We're seeking a Senior Full-stack Developer to help build a new product using Python and FastAPI for the backend, React/TypeScript for the frontend, and PostgreSQL and OpenSearch for database management.

The product runs in a multi-cloud environment and relies heavily on Databricks.

Responsibilities

• Build and maintain web applications with Python/FastAPI and SQL
• Design APIs and integrations that handle high-load database operations
• Improve query performance across production systems
• Support front-end development efforts using TypeScript and React
• Use GenAI engineering tools to enhance development workflows
• Work both collaboratively with the team and independently on assigned tasks
• Maintain proactive communication with team members and stakeholders
• Own product features and contribute meaningfully beyond simply completing tickets
• Handle ambiguity and deliver results within a fast-paced startup setting

Requirements

• 5+ years of hands-on production experience with Python, FastAPI, and SQL
• Strong expertise in web application development, API design, and integrations
• Skilled in managing high-load databases and optimizing query performance
• Some front-end experience with TypeScript and React, along with openness to full-stack work
• Practical experience using GenAI engineering tools, Claude Code preferred
• Excellent communication skills and a proactive mindset, comfortable working solo or as part of a team
• Ability to navigate ambiguity and make progress independently in a transparent, fast-moving startup setting
• English fluency at B2 level or above

Nice to have

• Strong background in TypeScript, React, Next.js, Storybook, Playwright, Radix UI, and Zustand
• Hands-on experience with PostgreSQL and OpenSearch
• Knowledge of cloud platforms, Infrastructure as Code, and related tooling
• Experience in data engineering, particularly working with PySpark and Spark SQL
• Prior experience working directly with clients

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

Company Background

We will reach out to selected candidates exclusively EPAM is global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, we empower our clients to become AI‑Native enterprises, driving measurable value from innovation and digital investments.