Senior Full-stack Developer

your Jared; Katowice; Hybrid; PLN 240,000 - 420,000; Full time

Benefits offered by this job

Hybrid work Poland

Stock Purchase Plan

Health insurance

Relocation opportunities

English classes

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, and PostgreSQL/OpenSearch for data management.

The role involves owning features, designing APIs, and delivering high‑quality code in a fast-growing startup. Hybrid work within Poland and potential international opportunities are offered.

Qualifications

• 5+ years of hands-on production experience with Python, FastAPI, and SQL.
• Strong expertise in web application development, API design, and integrations.
• Experience optimizing high-load databases and query performance.
• English fluency at B2 level or above.

Responsibilities

• Build and maintain web apps with Python/FastAPI and SQL.
• Design scalable APIs and integrations for high-load databases.
• Improve query performance across production systems.
• Support frontend with TypeScript and React.
• Collaborate with team and own features end-to-end.
• Navigate ambiguity in a fast-paced startup.

Skills

Python

FastAPI

SQL

Web development

TypeScript

React

GenAI tools

Communication

Tools

PostgreSQL

OpenSearch

Databricks

Cloud platforms

IaC tooling

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 Additional information Benefits listed above are available to employees only. Contractors are welcome; terms of B2B cooperation agreements are agreed individually. Only selected candidates will be contacted.