Senior Frontend Engineer (React/TypeScript)

About CONXAI

CONXAI has built an agentic AI platformfor the Architecture, Engineering and Construction (AEC) and physical industries, focused on knowledge-automation. We automate high-stakes, knowledge-intensive workflows traditionally trapped in siloed data, fragmented tools and tacit (undocumented) human expertise.

Our multi-agent systemsperform complex reasoning in the physical world; and transform bespoke, service-heavy processes into scalable Service-as-a-Softwareautomation.

CONXAI is trusted by some of the leading AEC companies in Europe, US, LATAM and Japan.

Your Role

As a Senior Frontend Engineer, you will play a key role in shaping and evolving a modern, scalable frontend architecture within a complex B2B AI platform.

You won’t just implement features - you’ll design systems. You’ll think in terms of structure, boundaries, and long-term sustainability. Your focus will be on building robust, maintainable solutions that can grow with the product and the organization.

This role is ideal for someone who:

• Takes ownership of architectural decisions
• Values clean abstractions and clear domain boundaries
• Thinks beyond short-term delivery toward long-term scalability
• Enjoys collaborating across teams to align technical direction
• Sees frontend engineering as system design, not just UI implementation

You will influence how the frontend evolves, contribute to technical standards, and help ensure the platform remains scalable, testable, and maintainable as it grows.

What You’ll Do

Architect & Build at Scale

• Develop complex B2B features using React 18 + TypeScript
• Work within a structured Feature-Sliced Design (FSD)architecture
• Design clean domain boundaries and public APIs between layers
• Build reusable features, widgets, and domain entities
• Maintain architectural integrity using dependency rules and validation tools

Deliver High-Quality Code

• Write type-safe, production-grade TypeScript
• Implement unit & integration tests (Jest, React Testing Library)
• Optimize performance, bundle size, and rendering efficiency
• Implement robust error handling and monitoring

Build Advanced Product Capabilities

• Implement efficient server-state management with TanStack Query
• Work on complex UI patterns
• Collaborate on AI feature integration (LLM workflows, structured outputs)

Collaborate & Lead

• Work closely with backend engineers on RESTful APIs
• Contribute to architectural decisions and technical planning
• Conduct thoughtful code reviews
• Mentor mid/junior engineers on architecture and best practices

Our Tech Stack

• React 18 + TypeScript 5.5+
• Feature-Sliced Design (layered architecture)
• TanStack Query + Zustand
• Material-UI (MUI v5) + Emotion
• SCSS Modules
• Webpack 5
• AWS Amplify & Cognito
• Jest + React Testing Library + MSW
• CI/CD pipelines with automated testing

What We’re Looking For

Required

• 5+ years of professional frontend experience
• Advanced React & TypeScript expertise
• Strong architectural thinking (FSD, Clean Architecture, or similar)
• Experience with modern state management
• Strong testing mindset (unit & integration)
• Experience integrating REST APIs
• Strong written and verbal English communication skills
• High standards for code quality and maintainability

Highly Valued

• Experience building complex B2B SaaS products
• Knowledge of scalable frontend architecture patterns
• Experience with performance optimization
• Experience with AWS (Cognito / Amplify / S3 / CloudFront)

Nice to Have

• Experience in AEC, construction, or document-heavy domains
• Exposure to AI/ML integrations in frontend applications
• PDF rendering or document processing experience

Why CONXAI

• Edge of Innovation:Be at the absolute forefront of AI in the construction tech space
• High Autonomy:Own the product strategy and shape a product that directly impacts the industry
• Top-Tier Peer Group:Work with a global team of ML engineers, software engineers and industry practitioners
• Equity & Scale:Competitive compensation with significant equity upside

**Applications for "Remote work" will not be accepted**