Senior Low-Latency Java Engineer

Morgan McKinley; Greater London; Hybrid; GBP 110,000 - 140,000; Full time

Benefits offered by this job

High-base compensation

No variable bonus

Job summary

Morgan McKinley is seeking a top-tier Low-Latency Java Engineer for a multi-year engagement to build ultra-fast, event-sourced microservices for FX or Cash Equities domains.

You will optimize performance across OS, JVM, and application layers, collaborating with front-office teams to deliver scalable, deterministic systems in a hybrid London environment.

Qualifications

• Deep mastery of modern Java, the JVM, and Linux.
• Track record of targeted performance tuning and memory management.
• History of long tenures showing mission commitment.
• Passionate technologists with strong academic records and quality engineering focus.

Responsibilities

• Engineer extreme-performance Java frameworks based on event-sourcing architectures.
• Perform JVM tuning, profiling at OS/JVM/app levels.
• Collaborate with quantitative/front-office stakeholders to communicate architecture clearly.
• Produce UML diagrams and clear system documentation.

Skills

Deep Java Mastery

Mechanical Sympathy

Proven Commitment

X-Factor

Job description

Location: London (Hybrid: Approx. 3 days per week onsite with the client)

About Us

We are an elite technology consultancy called in by tier-1 financial institutions when engineering precision is absolutely non-negotiable. We are often engaged when other vendors fail, maintaining an exceptionally high bar for technical skill, EQ, productivity, and conscientiousness. We operate on a transparent, high-base compensation model with no variable bonus, designed to attract and retain the market's top engineering talent.

The Role

We are seeking a top-tier Low-Latency Java Engineer to join a multi-year, mission-critical engagement building next-generation electronic trading platforms. Operating across either Foreign Exchange (FX) or Cash Equities domains, you will architect and build ultra-fast, commercial-grade, event-sourced microservices from the ground up. You will tackle massive scale and deterministic latency, ensuring systems operate flawlessly under severe market volatility.

Core Responsibilities

• Engineer extreme-performance, mission-critical Java frameworks based on event-sourcing architectures.
• Conduct relentless performance assessments, JVM tuning, and system profiling at the OS, JVM, and application layers.
• Collaborate directly with quantitative and front-office stakeholders, utilizing high EQ to communicate complex architectural decisions clearly.
• Produce clear diagrammatic documentation and model key system aspects using UML sequence diagrams.

What We Are Looking For

• Deep Java Mastery: Complete knowledge of modern Java, the JVM, and the Linux Operating system.
• Mechanical Sympathy: A proven track record of targeted performance tuning, memory management, avoiding GC pauses, and writing zero-allocation code.
• Proven Commitment: A history of solid tenures (mostly 3+ years), demonstrating you are someone who invests in the mission and makes good long-term decisions.
• The "X-Factor": We look for passionate technologists with prestigious previous employers, high-achieving academic records, and a dedication to quality engineering (TDD, CI/CD, observability).