Senior Kotlin Developer

FE fundinfo; United Kingdom; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A leading financial data provider is seeking a Senior Kotlin Developer to take ownership of core backend systems. You will drive stability and performance across a global technology platform, leveraging your experience in Java or Kotlin, and contribute to system architecture. The role supports hybrid working and encourages technical influence in a collaborative environment where depth of learning is valued. Fluency in German is essential for stakeholder collaboration.

Qualifications

• Several years of experience as a senior backend engineer.
• Strong hands-on experience with Java or Kotlin, preferably with Spring Boot.
• Deep expertise in MongoDB or NoSQL technologies.

Responsibilities

• Own and stabilise core backend microservices.
• Optimise performance of existing services.
• Contribute to system architecture and technical decisions.
• Participate in 2nd and 3rd level support.
• Ensure high-quality delivery across backend services.
• Support ongoing operation of production systems.

Skills

Senior backend engineering experience

Java or Kotlin

Spring Boot

MongoDB or NoSQL

Algorithmic thinking

Ownership mindset

Fluency in German

Job description

Take ownership of critical backend systems and play a stabilising, high-impact role in shaping scalable, production-grade technology used across a global investment platform.

This is a senior-level opportunity where your technical judgement, ownership mindset, and backend expertise will directly influence system stability, performance, and architectural direction. You will work on meaningful, long-lived services rather than greenfield experiments, collaborating with experienced engineers in an environment that values pragmatic decision-making, calm execution under pressure, and sustainable solutions over over-engineering. The role offers room to deepen your technical breadth, contribute to architectural discussions, and act as a trusted technical anchor within the team.

Your key responsibilities as a Senior Kotlin Developer will include:

• Owning, developing, and stabilising core backend microservices to ensure reliability and scalability in production environments.
• Optimising performance of existing services and processes, with a strong focus on efficiency and long-term maintainability.
• Contributing to system architecture, technical decision-making, and thorough pull request reviews to uphold engineering standards.
• Participating in 2nd and 3rd level support, including root cause analysis and operational problem-solving.
• Working closely with other engineers to ensure high-quality delivery across backend services and, where required, occasional frontend tasks.
• Supporting the ongoing operation of production systems through monitoring, analysis, and continuous improvement.

You will need the following experience and skills to join us as a Senior Kotlin Developer:

• You bring several years of experience as a senior backend engineer, with confidence operating and improving production systems.
• You have strong hands-on experience with Java or Kotlin, ideally using Spring Boot in a microservices environment.
• You demonstrate deep expertise in MongoDB or NoSQL technologies, including aggregations and performance-focused data modelling.
• You apply strong algorithmic thinking with a clear focus on scalability, performance optimisation, and sustainable solutions.
• You are comfortable taking ownership, performing root cause analysis, and contributing calmly and effectively during production incidents.
• You possess full professional fluency in German, enabling you to collaborate with stakeholders, contribute to technical discussions, and support cross-functional teams confidently.

FE fundinfo is a leading financial data provider, connecting the investment industry across the UK, Europe, and Asia-Pacific through an integrated platform. Our skilled team empowers clients with data-driven insights, making the industry Navigate Complexity with Confidence!

You will join a collaborative, experienced engineering team that values ownership, clear communication, and pragmatic problem-solving. The environment supports flexible and hybrid working, encourages knowledge sharing, and provides opportunities to influence technical direction without unnecessary hierarchy. Learning is embedded into everyday work, with space to grow both technically and professionally while contributing to systems that matter.

Apply now, and we'll aim to get back to you with feedback within 5 working days.