We are seeking a highly skilled Principal Backend Engineer to join our client’s growing team in London. This is a pivotal, hands‑on role at the heart of the engineering organization — shaping architecture, driving technical strategy, and mentoring a talented team of developers. You will ensure the platform meets ambitious goals for scale, performance, and security, while upholding the highest standards of engineering excellence. You won’t just write code — you’ll influence the technical vision, guide major architectural decisions, and help build the foundation for the company’s next phase of growth.
Details
Location: London, UK (Hybrid – 2–3 days per week in the office)
Employment Type: Full‑Time, Permanent
Start Date: ASAP
Language Requirements: Fluent English
Key Responsibilities
Architect & Design: Lead the design and architecture of distributed, cloud‑native systems that are scalable, resilient, and maintainable.
Technical Strategy: Partner with engineering leadership to define and implement the long‑term technical roadmap.
Problem Solving: Address complex challenges in performance, scalability, operations, and data processing for high‑throughput systems.
Mentorship: Guide and support engineers through code reviews, design sessions, and technical coaching.
Best Practices: Promote engineering excellence through high standards in coding, testing, security, and cloud architecture.
Hands‑On Development: Actively contribute production‑quality code for critical components and infrastructure projects.
Requirements
10+ years of experience in software engineering, building and delivering large‑scale distributed systems in a high‑growth environment.
Advanced proficiency in Java and modern frameworks such as Spring Boot.
Strong experience with relational databases (PostgreSQL, MSSQL), including data modeling and query optimization.
Hands‑on experience with Apache Kafka and event‑driven architectures.
Deep understanding of cloud platforms, ideally AWS (ECS/Fargate, S3, RDS).
Strategic and analytical mindset, capable of translating business needs into technical execution.
Excellent communication and leadership skills with experience mentoring engineering teams.
Nice to Have
Experience in the Fintech or financial services sector.
Proven ability to resolve complex scalability and performance challenges in fast‑growing environments.
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