Senior Software Engineer – Java Inside IR35

Location: London (3 days onsite / 2 days remote)

Contract: 6–12 month rolling contract

Start: Immediate / ASAP

Overview

We are seeking five Senior Java Engineers to join a high-performing engineering team within a leading financial services organisation. You will be working on large-scale, distributed systems supporting critical trading and financial platforms.

This is a hands‑on engineering role requiring strong backend development experience in modern Java ecosystems, with a focus on scalable, event‑driven architectures.

Key Responsibilities

• Design, build, and maintain scalable backend services using Java (11+)
• Develop microservices using Spring Boot
• Build and maintain event‑driven systems using Apache Kafka
• Deploy and operate services on AWS cloud infrastructure
• Collaborate with architects, product owners, and other engineers in an Agile environment
• Ensure high standards of code quality, testing, and system reliability
• Support production systems and participate in on‑call rotations where required

Key Skills & Experience

• Strong commercial experience as a Senior Java Engineer
• Extensive experience with Java (11 or higher) and Spring Boot
• Strong hands‑on experience with Apache Kafka (stream processing, event‑driven architecture)
• Proven experience working on AWS (e.g., EC2, ECS, S3, Lambda, RDS, CloudWatch)
• Background in financial services (essential) – banking, trading, investment, or fintech environments
• Experience with microservices architecture and distributed systems
• Strong understanding of RESTful APIs and messaging systems
• Experience with CI/CD pipelines and DevOps practices
• Comfortable working in an Inside IR35 contract environment

Nice to Have

• Experience with Kubernetes / Docker
• Exposure to real‑time trading systems or low‑latency platforms
• Knowledge of Terraform or Infrastructure as Code
• Experience with observability tools (Prometheus, Grafana, ELK stack)

Additional Information

• Hybrid working model: 3 days per week in London office
• 6–12 month initial contract with strong likelihood of extension
• Working within a fast‑paced, high‑availability financial environment

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