Software Engineer (FinTech)

G MASS
London

G MASS is supporting a global FinTech organisation with the expansion of a core engineering team building enterprise-scale, AI-enabled data products. This role sits within a highly collaborative, Agile engineering environment focused on delivering scalable, cloud-native platforms used across the business.

You’ll work as part of a senior engineering group responsible for designing, building and maintaining high-performance software components within a distributed data ecosystem. The focus is on clean architecture, modern Java development and strong engineering practices.

Key responsibilities

  • Design, develop and maintain scalable software and data-modelling components within a distributed platform
  • Translate business and technical requirements into robust, well-designed solutions
  • Apply best-practice software engineering standards including code reviews, TDD and CI/CD
  • Troubleshoot and resolve complex software defects and performance issues
  • Actively participate in Agile ceremonies including sprint planning, stand-ups, demos and retrospectives
  • Mentor junior engineers through code reviews, pairing and knowledge sharing
  • Contribute to architectural decisions to ensure scalability, reliability and security
  • Produce and maintain clear technical documentation covering designs and workflows
  • Engage with stakeholders to communicate progress, risks and solutions
  • Continuously evaluate new tools, frameworks and approaches to improve engineering quality

Requirements

  • Strong commercial experience in software engineering, with deep expertise in Java (modern versions preferred)
  • Experience building distributed, enterprise-grade systems
  • Proficiency in SQL and experience working with relational and big-data technologies
  • Hands-on experience with commonly used databases such as PostgreSQL, HBase or Trino
  • Knowledge of gRPC patterns (unary, streaming and REST mapping)
  • Solid understanding of OOP design patterns, TDD and enterprise system design
  • Comfortable working in Linux environments using command-line tools
  • Experience with version control and collaborative development workflows

Nice to have

  • Experience with modern Java UI frameworks
  • Exposure to Apache Spark, Kafka or Avro
  • Cloud experience across AWS, Azure, GCP or Oracle Cloud
  • Knowledge of Kubernetes and containerised environments
  • Familiarity with DevOps practices and automation
  • Experience with additional languages or runtimes (e.g. C#, .NET, Python, JavaScript, GraalVM)

Benefits

Initial 6-month contract, with strong possibility of extension and/or permanency.

Salary to be discussed.

Posted 2026-02-03

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