Arbetsbeskrivning

Job Title: Principal Java Developer (with Python experience)

Location: London, United Kingdom

Job Type: Permanent

Job Description:

We’re looking for a Principal Java Developer with solid Python experience to lead the re-architecture of our core platform. You’ll play a strategic and hands-on role, helping modernise legacy systems into a scalable, cloud-native infrastructure. This is a senior-level position involving close collaboration with the IT Director and senior stakeholders.

Key Responsibilities:

• Lead the architectural redesign of our Java-based application and database infrastructure
• Work with the IT Director and stakeholders to define a scalable, future-ready platform
• Design and build microservices using Java, Spring Boot, Spring Data, and JPA
• Integrate asynchronous workflows using AWS SQS or similar message brokers
• Own and manage containerised deployment pipelines using Docker and CI/CD principles
• Build and maintain data pipelines with Apache Airflow; transform data using Python and Pandas
• Mentor and guide engineers, promoting high standards in code quality, testing, and design
• Drive system performance, scalability, and engineering best practices
• Participate in architecture reviews, planning sessions, and cross-functional collaboration

Essential Skills & Experience:

Backend & Microservices

• Expert-level Java skills with strong experience in microservices architecture
• Proficient in Spring Boot, Spring Data, JPA, and Hibernate
• Experience with message brokers like AWS SQS, SNS, or Kafka
• Strong understanding of REST APIs, event-driven systems, and distributed systems

Containerisation & DevOps

• Advanced experience with Docker in production
• Familiarity with Kubernetes (a plus)
• Understanding of CI/CD pipelines and infrastructure as code

Data Engineering & Scripting

• Proficient in Python, especially for scripting and data transformation
• Strong experience with Pandas and Apache Airflow

Architecture & Communication

• Proven track record in leading system architecture overhauls in enterprise environments
• Excellent communication skills, able to present complex ideas clearly
• Comfortable working with CTOs, architects, and senior leadership

Preferred Qualifications:

• Experience with cloud platforms, especially AWS
• Background in legacy system migration or monolith-to-microservices transitions
• Industry experience in FinTech, InsurTech, or other regulated sectors (optional)