Senior Full Stack Engineer at Complexio

Warsaw, Masovian Voivodeship, Poland -

Full Time

Start Date

Immediate

Expiry Date

02 Mar, 26

Salary

0.0

Posted On

02 Dec, 25

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

React, TypeScript, JavaScript, Vite, ESLint, REST APIs, Python, FastAPI, Vitest, Jest, React Testing Library, UX, Electron, Node.js, Event-driven Systems

Industry

Software Development

Description

At Complexio, we’re building the intelligence layer for enterprise AI—automatically creating a connected understanding of an organisation’s people, processes and systems, and turning that into real-time automation and insight. Our platform ingests structured and unstructured data, constructs a living Event Knowledge Graph, and orchestrates multiple AI models to uncover hidden workflow opportunities and drive autonomous action. As a Senior Frontend Full Stack Engineer, you will join us at an exciting inflection point: you’ll help shape the way thousands of enterprise-users engage with our platform. You’ll work with a team of software engineers, data scientists, product experts and business analysts to craft next-generation web applications and user experiences that bring our powerful automation engine to life. Your role will be foundational in translating data-rich insights into intuitive, performant, and scalable interfaces - bridging the gap between advanced AI infrastructure and real-world business impact. If you are passionate about working at the intersection of rich front-end engineering, full-stack product delivery and enterprise AI innovation, and you thrive in a fast-moving, deeply technical team, then we’d love to hear from you. Must-Haves React + TypeScript (advanced) Strong JavaScript fundamentals (async, modules, performance) Experience with Vite, ESLint, modern tooling Building scalable UI with components, hooks, and context Integrating with REST APIs, async flows, error handling Writing maintainable code + strong code review skills Familiar with LLM-based features (streaming, prompts, AI-driven UI) Testing with Vitest/Jest + React Testing Library Good UX instincts & ability to work independently Must-Haves if we consider full-stack, nice to have for frontend Python backend familiarity (FastAPI/async I/O, API contracts) Nice-to-Haves Experience with Electron apps (main/renderer, preload, IPC) React Query / Zustand or other state libraries Advanced TypeScript patterns (generics, mapped types) Performance debugging (React Profiler, bundle optimization) Knowledge of Radix/shadcn/ui or similar component libraries Node.js fundamentals Event- driven systems familiarity Join a pioneering joint venture at the intersection of AI and industry transformation. Work with a diverse and collaborative team of experts from various disciplines. Opportunity for professional growth and continuous learning in a dynamic field.

Responsibilities

As a Senior Full Stack Engineer, you will help shape the way enterprise users engage with our platform by crafting next-generation web applications. Your role will be foundational in translating data-rich insights into intuitive and scalable interfaces.