Full Stack Engineer

Uniting Holding; Dublin; On-site; EUR 60,000 - 85,000; Full time

Benefits offered by this job

25 days paid annual leave

Free inference tokens

Job summary

Uniting Holding is seeking a Full-Stack Engineer to join our innovative team in Dublin. This role involves taking ownership of features from our customer-facing dashboard to backend API services. You will primarily work in TypeScript, utilizing React and Node.js to create responsive, user-friendly applications.

We offer a highly competitive remuneration package, 25 days paid annual leave, and a hybrid working environment from our Dublin office. Be part of a team where your contributions will directly impact the platform that serves our customers.

Qualifications

• 5+ years of professional experience building full-stack web applications.
• Practical experience with authentication systems and web security practices.
• Experience with cryptocurrency payment protocols is desirable.

Responsibilities

• Design and ship features spanning frontend and API layers.
• Build responsive, accessible interfaces using React and Next.js.
• Develop and maintain RESTful API services in Node.js/Express.
• Write and maintain automated tests across the stack.
• Own and evolve authentication and authorisation systems.
• Build and maintain third-party integrations including payment processing.

Skills

Advanced proficiency in TypeScript

Strong frontend skills with React and Next.js

Solid backend experience with Node.js and Express

Experience with PostgreSQL and Redis

Familiarity with payment platform integration

Experience with Docker

Comfortable using AI-assisted development tools

Education

BSc/MSc in Computer Science, Software Engineering or related discipline

Job description

Tensorix is a sovereign AI infrastructure platform headquartered in Dublin. We deploy and host open-source large language models on EU-sovereign infrastructure across Europe, providing private, zero-retention inference for regulated industries including finance, healthcare and government. Our platform offers drop-in OpenAI-compatible APIs, enabling developers and enterprises alike to adopt AI without compromising on data privacy, compliance or performance.

We are looking for Full-Stack Engineers to join our growing engineering team. Reporting to the CTO, you will take ownership of features across the entire product surface, from our customer-facing dashboard and billing systems through to our backend API services and infrastructure tooling. This is a hands‑on, high‑impact role in a fast‑moving scaleup where your work will directly shape the platform our customers rely on.

You will work across multiple projects, primarily in TypeScript, spanning a React/Next.js frontend and a Node.js/Express API layer backed by PostgreSQL and Redis/Valkey. Frontend development is a key part of this role, and you will be responsible for building the interfaces our customers and their agents interact with daily. We are an AI‑native team and tools such as Claude Code and Codex are part of our standard workflow, not an experiment. We value engineers who can deliver polished, accessible user experiences while also contributing to robust backend services.

Responsibilities

Feature Delivery – Design, build and ship end‑to‑end features spanning the frontend dashboard, REST API and database layers, taking work from specification through to production deployment.

Frontend Development – Build responsive, accessible and performant interfaces using React and Next.js with server‑side rendering, middleware and modern routing patterns. Implement design systems using headless component primitives and utility‐first CSS.

Backend & API Development – Develop and maintain RESTful API services in Node.js/Express with full TypeScript type safety. Design relational database schemas and write performant SQL. Implement caching, rate limiting and background job processing.

Testing & Reliability – Write and maintain automated tests across the stack, including unit, integration and end‑to‑end tests. Champion testing best practices and help build a culture of confidence in deployments.

Authentication & Security – Own and evolve our authentication and authorisation systems, including JWT‑based auth flows, role‑based access control and security hardening throughout the platform.

Payments & Integrations – Build and maintain third‑party integrations including payment processing, cryptocurrency payment flows, transactional email, bot protection and customer messaging.

Infrastructure & DevOps – Manage containerised development and deployment workflows using Docker within a cloud‑native environment. Maintain CI/CD pipelines and contribute to platform reliability.

Code Quality & Collaboration – Participate in code reviews, contribute to architectural decisions and help establish best practices. Share knowledge and support your teammates across the engineering team.

Skills & Experience

5+ years of professional experience building full‑stack web applications

Advanced proficiency in TypeScript across frontend and backend codebases

Strong frontend skills with React and Next.js (SSR, App Router, middleware), headless component libraries (e.g. Radix UI, shadcn/ui) and utility‑first CSS frameworks

Solid backend experience with Node.js, Express, PostgreSQL (schema design, raw SQL) and Redis/Valkey

Practical experience with authentication systems, role‑based access control and web security practices

Familiarity with payment platform integration (e.g. Stripe). Experience with cryptocurrency payment protocols is desirable

Experience with Docker and containerised deployment workflows

Comfortable using AI‑assisted development tools (e.g. Claude Code, Codex) as part of your daily workflow

A clear and concise communicator who thrives in ambiguity and can articulate technical decisions to both technical and non‑technical audiences

Nice to Have

Experience working with large language models, including areas such as prompt engineering, context engineering, fine‑tuning, RAG, evaluation and model deployment

Experience with AWS and related services (e.g. EC2, ECS, S3, Lambda, CloudFront)

Exposure to Python and Golang

Education & Qualifications

BSc/MSc in Computer Science, Software Engineering or a related technical discipline OR equivalent practical experience

Remuneration

Highly competitive package, dependent on experience

25 days paid annual leave

Hybrid working from our centrally located Dublin office

Free inference tokens!