Senior Scala Engineer

mthree; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

mthree is scaling its strategic Post Trade Data Platform across Global Markets, with a focus on data accessibility, usability, resilience and quality. You will join a cross-continental Engineering and Architecture team (London, New York, India) central to a major transformation program enabling operational intelligence, analytics and AI-driven use cases.

As a permanent, salaried consultant deployed to a leading investment bank, you will lead architectural direction, mentor engineers and drive

Qualifications

• Expertise in JVM languages with performance optimisation.
• Experience with Oracle Exadata, MongoDB, Elasticsearch or similar.
• Cloud and DevOps: Linux/Unix, OpenShift/Kubernetes, Ansible.
• Reactive, event-sourced systems with Spark/Flink.
• APIs and data formats: REST, Protobuf, Avro, Parquet.
• Familiarity with Iceberg/Databricks/Hadoop.
• TDD/ATDD and CI/CD (Jenkins, Gradle).

Responsibilities

• Build the Strategic Platform with scalable and resilient solutions.
• Own Architecture & Strategy to support future needs.
• Lead Through Craft via architecture, design, and code reviews.
• Mentor engineers and drive continuous improvement of platform capabilities.

Skills

JVM languages

Performance tuning

Reactive systems

Engineering leadership

Agile/Scrum

Tools

Oracle Exadata

MongoDB

Elasticsearch

OpenShift/Kubernetes

Ansible

Apache Spark

Apache Flink

Protobuf/Avro/Parquet

Iceberg/Databricks/Hadoop

Jenkins/Gradle CI/CD

Job description

A tier-one global investment bank is scaling its strategic Post Trade Data Platform across Global Markets, with upcoming initiatives set to grow the platform to 10x current ingestion volumes while raising the bar on data accessibility, usability, resilience and quality.

You will join a horizontal Engineering and Architecture team spanning London, New York and India, sitting at the centre of a major transformation programme that underpins operational intelligence, advanced analytics and next-generation AI-driven use cases.

Key Responsibilities

• Build the Strategic Platform: Engineer innovative, scalable and resilient solutions that advance the core data platform.
• Own Architecture & Strategy: Define and drive the technical direction needed to support the future needs of Operations and the business.
• Lead Through Craft: Provide technical leadership via architecture, design, and code/PR reviews, championing high standards of code quality and engineering excellence.
• Mentor & Improve: Mentor engineers and drive continuous improvement in platform capabilities, development practices, and operational effectiveness.

Required Skills

• Core Technical Stack: Deep expertise in Scala, Java, or another JVM language, including performance optimisation and tuning.
• Data Platforms: Strong experience with database technologies including Oracle Exadata at scale, MongoDB, Elasticsearch, or similar.
• Cloud & DevOps: Solid knowledge of Linux/Unix, OpenShift/Kubernetes, and Ansible.
• Distributed Systems: Experience building and supporting reactive, event-sourced systems, with hands-on Apache Spark and Apache Flink.
• APIs & Data Formats: Strong understanding of Apache HTTP, Envoy, and REST API design, plus experience with Protobuf, Avro, and Parquet.
• Knowledge of Iceberg, Databricks, and Hadoop ecosystems.
• TDD, ATDD, and Clean Coding practices within a CI/CD environment (e.g. Jenkins, Gradle).
• Experience with Scrum/Agile methods and modern software design patterns.

The mthree Model

Operating from Bromley, you will join mthree as a permanent, salaried consultant deployed exclusively to this leading investment bank.

• You’ll receive a competitive salary and benefits package, dedicated professional support, and a transparent, contractually defined pathway to transition directly into the client’s permanent headcount.