CareerPlanSign in

Mid/Senior Frontend Developer

Krakow, Poland💼 Full-time🗓 2026-06-11 → 2026-09-27

Core

Architect and deliver complex, scalable frontend systems for a digital intelligence platform serving 2,500+ enterprises in tech, retail, gaming, and finance.

Role type

Senior Frontend Engineer (React/TypeScript)

Builds

Scalable frontend applications and data-heavy interfaces for global clients

Domain

Digital Intelligence / Mobile Analytics / SaaS

Deliverable

production ML models | product features

Required skills

Modern JavaScript, TypeScript, React, State Management (TanStack Query, Zustand, Redux, MobX), Web Performance Optimization, Unit/Integration Testing (Jest, Playwright), System Architecture, Technical Mentorship

Preferred skills

Data Visualization (Highcharts), Ruby on Rails, Angular, Clickhouse, Mongo, Postgres, AI-driven coding tools

Technologies

React, TypeScript, TanStack Query, React Router, Zustand, Jest, Playwright, Highcharts, Ruby on Rails, Angular, Clickhouse, Mongo, Postgres

Responsibilities

Architect complex frontend systems, partner with Product Managers on requirements, lead technical decision-making for medium-to-large features, mentor junior engineers, identify and fix technical debt, advocate for web performance best practices, collaborate with Data Science and Backend teams

Seniority

Senior, hands-on IC with mentorship responsibilities

Sourced via ashby · Listed on CareerPlan, which tracks 813,000+ jobs from 20+ sources.