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Complexio

Posted 6 months ago

Open

Senior Full Stack Engineer

WarsawOn-siteFull-time

AI Summary

Senior Frontend Full Stack Engineer who builds scalable web interfaces and collaborates with AI/backend teams to translate data-driven insights into intuitive user experiences.

About this role

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.

Skills

API ContractsAsync FlowsAsync IOBundle OptimizationElectronError HandlingESLintFastAPIGeneric TypeScript PatternsJavaScriptJestNode.jsPerformance ProfilingPythonRadixReactReact QueryReact Testing LibraryREST APIShadcn/uiTypeScriptViteVitestZustand

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