Senior Full-stack Developer

your Jared; Poznań; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Hybrid/remote work Poland

Work abroad up to 60 days annually

Relocation opportunities

Stock Purchase Plan with 15% discount

Health insurance

Multisport

Vouchers

Job summary

your Jared is seeking a Senior Full-stack Developer to build a new product using Python and FastAPI for the backend, React/TypeScript for the frontend, with PostgreSQL and OpenSearch for data management in a multi-cloud environment leveraging Databricks.

The role focuses on API design, high-load query optimization, and hands-on ownership of features in a fast-moving startup, with hybrid/remote work across Poland and collaboration with a small team.

Qualifications

• 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, 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 progress independently in a fast-moving startup.

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.

Skills

Python

FastAPI

SQL

React

TypeScript

GenAI tools

Tools

PostgreSQL

OpenSearch

Databricks

Claude Code

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

• 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, shopping vouchers Referral bonuses up to $2,000
• Offices with entertainment and relaxation zones, table tennis and football, free snacks, coffee, and more Corporate, social, and well-being events
• Benefits listed above are available to employees only. Contractor arrangements are also available; terms of B2B cooperation agreements are agreed individually.

Only selected candidates will be contacted.