Principal Engineer - Full-Stack (Java & React)
Up to £130,000 - London - 3 days per week onsite
Harvey Nash have partnered with a global consultancy that helps major organisations modernise their technology, build scalable digital products, and tackle complex engineering challenges. They partner with brands across finance, retail, tech scale‑ups and highly regulated environments delivering high‑impact solutions at speed.
They're now hiring multiple Principal Engineer's, people who can lead architecture and delivery, advise clients at a senior level, stay hands‑on with modern engineering, and shape the technical direction of major projects.
What You'll Be Doing
- Lead the design and implementation of full-stack applications using technologies like Java, Python and Typescript.
- Have experience or exposure to frameworks like Spring, Flask and React.
- Acting as a senior technical consultant, guiding clients through complex engineering decisions.
- Mentoring and uplifting engineering teams, driving best practice across delivery.
- Owning architectural decisions and contributing to long-term technical strategy.
- Ensuring engineering excellence via code reviews, design governance and DevOps/Agile practices.
- Managing delivery expectations, timelines and stakeholder relationships.
What They're Looking For
Essential:
- Strong background as a senior/principal full‑stack engineer (backend + frontend).
- Proficiency in Java, Python, JavaScript/TypeScript or similar.
- Understanding of AI‑powered development practices and how they improve the SDLC.
- Expertise in software design patterns, architecture and scalable system design.
- Experience leading engineering teams, coaching developers and influencing technical direction.
- Strong consulting mindset - able to translate complex problems into clear solutions.
- Proven experience in Agile environments and modern DevOps workflows.
Desirable:
- Cloud experience (AWS, Azure or GCP) - including serverless.
- Knowledge of Docker, Kubernetes or other container technology.
What Makes This Opportunity Stand Out
This consultancy offers one of the strongest people-focused benefits packages in the market. Highlights include:
⭐ Work-Life Balance & Time Off
⭐ Growth & Development
⭐ Health & Wellbeing
⭐ Financial Benefits
- Discretionary bonus scheme
