Sans Souci
Senior Full Stack Engineer
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Sans Souci
Sans Souci is a fast-growing digital innovation firm based in Belfast. We are looking for a Senior Full Stack Engineer to join our growing technology team and take on real ownership across our client and product work.
We build increasingly sophisticated digital products, data platforms, AI-enabled solutions, and cloud services for clients across the public and private sectors. We need you to do more than take tickets and write code. You’ll need to understand a problem, help shape the solution, make sound technical decisions, build it, test it, deploy it, and support other engineers to deliver well. This is a genuine next step for a Senior Developer ready to grow. There is a clear and fast route to Technical Lead for the right person once you've proven your impact.
Key Responsibilities
Software Delivery
- 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 released through environments
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AI-Enabled Engineering
- Build and support AI and agentic AI solutions, including LLM APIs and RAG architectures
- Work with tool/function calling, structured outputs, and vector databases
- Use modern AI-assisted development tools while maintaining engineering discipline, review, and testing
- Evaluate and test AI systems for reliability and accuracy
- Stay current with emerging AI engineering practices and bring them into delivery
Collaboration & Client Work
- Turn incomplete or evolving requirements into sensible technical solutions
- Explain technical decisions clearly to non-technical stakeholders
- Review other engineers' code and share knowledge generously
- Work directly with clients when required
- Support the wider team in raising engineering standards day to day
Essential Skills & Experience
- Python
- TypeScript / JavaScript
- React, Next.js, or similar modern frontend frameworks
- FastAPI, Node.js, or equivalent backend technologies
- REST APIs and API-first development
- SQL and modern data platforms
- Cloud & Engineering Practices
- Azure and/or AWS, including Azure Functions / Durable Functions and serverless architectures
- Containers and Docker
- Git and GitHub
- CI/CD and automated deployment; Infrastructure as Code
- Automated testing and application security / secure development practices
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You don’t need to tick every box — we are more interested in excellent engineering fundamentals, strong problem-solving ability, and the appetite to learn.
Desirable
- Experience with LLM APIs, RAG architectures, or AI agents
- Exposure to Azure AI / OpenAI / AWS AI services
- Experience with evaluation and testing of AI systems
- Comfort reviewing others' code or supporting less experienced engineers
- Interest in eventually moving into a broader technical leadership role
Why Join Us
- Work with modern cloud and AI technologies
- Influence technical decisions and engineering practices as you grow
- Experiment with emerging technologies
- Work directly with experienced engineers, colleagues, and client teams
- See the software you build solve real-world problems
- Progress quickly to Technical Lead as you prove your impact
Salary: £55,000 annually.
If you’re a strong software engineer who wants more ownership, more variety, and room to grow quickly, we’d like to hear from you.
Please send your CV, LinkedIn profile, or GitHub profile along with a short introduction telling us about the type of systems you’ve been building.
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