# Senior Full Stack Engineer

> Complexio · Warsaw, Poland (Hybrid) · — · Posted 2025-12-02

**Workplace:** hybrid

**Department:** Poland

## 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.

## Requirements

**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

## Benefits

-   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.

## Apply

[Apply at Complexio](https://apply.workable.com/complexio/j/C13CE1BAE8/apply)

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