Senior Full-Stack Engineer: AI, Cloud & Lead Path

Sans Souci; Belfast City District; On-site; GBP 47,000 - 63,000; Full time

Job summary

Sans Souci in Belfast is seeking a Senior Full Stack Engineer to own delivery across client and product work, shaping solutions from conception through deployment.

You’ll work with React, Next.js and modern backend stacks (FastAPI/Node.js), on cloud-native Azure/AWS architectures, including AI-enabled projects. You’ll drive technical decisions, test, deploy and mentor peers, with a clear route to Technical Lead.

Qualifications

• Proficiency with React/Next.js for frontend and FastAPI/Node.js for backend.
• REST API design and API-first development.
• SQL and modern data platforms.
• Cloud platforms (Azure and/or AWS) with serverless architectures.
• Containers and Docker; CI/CD and Infrastructure as Code.
• GitHub and modern development tooling.
• Automated testing and secure development practices.
• DESIRABLE: Experience with LLM APIs or AI agents; Azure AI/OpenAI/AWS AI services.

Responsibilities

• Design, build, and deploy full-stack web applications and APIs
• Work across cloud-native architectures on Azure and/or AWS, including serverless and container-based services
• Contribute to data platforms, workflow orchestration and business process automation
• Apply automated testing, CI/CD and secure development practices throughout delivery
• Support infrastructure-as-code and deployment pipelines across client and internal projects
• Work with the Test Functions to get products release through environments

Skills

Engineering fundamentals

Problem solving

Willingness to learn

Tools

React

Next.js

FastAPI

Node.js

Azure Functions

Docker

GitHub

Serverless

CI/CD

Job description

Sans Souci in Belfast is seeking a Senior Full Stack Engineer to own delivery across client and product work, shaping solutions from conception through deployment.

You’ll work with React, Next.js and modern backend stacks (FastAPI/Node.js), on cloud-native Azure/AWS architectures, including AI-enabled projects. You’ll drive technical decisions, test, deploy and mentor peers, with a clear route to Technical Lead.