Senior Full-stack Developer

your Jared; Łódź; Hybrid; PLN 180,000 - 300,000; Full time

Benefits offered by this job

Health insurance

Multisport card

Shopping vouchers

Employee stock purchase plan

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 spans cloud-native architecture in a fast-paced startup environment.

Responsibilities include API design, performance optimization, and collaborating with the team to own features end-to-end. Experience with GenAI tools and strong communication are required.

Qualifications

• 5+ years of hands-on production experience with Python, FastAPI, and SQL.
• Strong expertise in web application development, API design, and integrations.
• Experience managing high-load databases and optimizing query performance.
• Some front-end experience with TypeScript and React, plus openness to full-stack work.
• Experience using GenAI engineering tools; Claude Code preferred.

Responsibilities

• Build and maintain web applications with Python/FastAPI and SQL.
• Design APIs and integrations for high-load database operations.
• Improve query performance across production systems.
• Support front-end development with TypeScript and React.
• Use GenAI tools to boost development workflows.
• Collaborate with the team and take ownership of features.

Skills

Python

FastAPI

SQL

API design

TypeScript

React

GenAI tooling

OpenSearch

Databricks

PostgreSQL

Cloud platforms

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, and AWS English classes

Stable pay

Participation in the Employee Stock Purchase Plan with a 15% discount

Benefits package including health insurance, multisport, and 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

Please note Listed benefits are available to employees only. Contractor collaboration is available; B2B agreement terms are agreed individually. Only selected candidates will be contacted.