At a Glance
- Tasks: Join a high-performance team to develop low-latency Java systems for global trading.
- Company: Leading financial institution focused on innovative technology solutions.
- Benefits: Hybrid work model, competitive salary, and opportunities for professional growth.
- Other info: Dynamic environment with a focus on clean design and measurable performance.
- Why this job: Make a real impact in finance with cutting-edge technology and expert collaboration.
- Qualifications: Strong Java skills and experience in low-latency systems required.
The predicted salary is between 43200 - 72000 € per year.
We're looking for Senior and Principal Java Developers with a strong background in low-latency systems to join us on a high-performance trading and real-time data project, for a major financial institution. You'll work on mission-critical applications where performance, scalability, and reliability truly matter — the kind of systems that power global trading platforms and require a deep understanding of how the JVM and Linux really work. This is an opportunity to bring world-class engineering principles to projects at the very heart of modern finance.
Your work will focus on writing and tuning high-performance Java frameworks, improving throughput and latency, and applying event-driven, microservice-based architectures. You'll collaborate closely with other talented engineers, helping to shape elegant solutions to complex, performance-sensitive problems.
You'll be joining an environment where good software engineering truly matters — where clean design, measurable performance, and deep system understanding are valued. This is an opportunity to work alongside recognised low-latency specialists, elevate your expertise, and contribute to systems that demand precision and technical excellence.
We're looking for developers who are technically exceptional, but also pragmatic — engineers who love to understand how things work under the hood, measure performance precisely, and continuously refine their craft.
Core skills- Strong Java skills with deep knowledge of the JVM
- Proven experience building or optimising low-latency systems
- Familiarity with performance tuning and profiling tools (e.g. JMH, async-profiler, Flight Recorder)
- Solid understanding of multithreading, concurrency, and memory management
- Experience with microservice architectures and event-driven systems
- Strong Linux fundamentals and comfort with performance diagnostics
- Clear communication skills and ability to articulate design and performance decisions
- Experience with high-performance messaging (Chronicle Queue/Wire, Aeron, ZeroMQ, Kafka tuning)
- Familiarity with off-heap or direct memory structures (Chronicle Map, VarHandles, DirectByteBuffers)
- Networking/I/O frameworks such as Netty or custom FIX engines
- Exposure to OpenHFT, LMAX Disruptor, or similar performance-focused frameworks
- Prior experience in trading, financial markets, or real-time data systems
- Ability to produce clear, lightweight documentation or UML diagrams when needed
These roles are hybrid - a mix of working from home and on-site collaboration in London, Canary Wharf.
We can only consider candidates who have the right to work in the UK and do not require visa sponsorship. Applicants must be UK-based and within a commutable distance to London.
Email careers@juxt.pro with your CV and a brief introduction. Even if you're not sure you tick every box, we'd still love to hear from you - we're always keen to meet passionate, technically curious developers and can keep you in mind for future projects if this one isn't the right fit.
Senior/Principal Java Engineer - Low Latency in London employer: Juxt Ltd.
Join a leading financial institution as a Senior/Principal Java Engineer, where you'll be part of a dynamic team dedicated to building high-performance trading systems. Our collaborative work culture values clean design and technical excellence, offering you the chance to elevate your skills alongside industry specialists in a hybrid work environment based in London. With a focus on employee growth and continuous learning, we provide a rewarding atmosphere for those passionate about low-latency systems and real-time data.
StudySmarter Expert Advice🤫
We think this is how you could land Senior/Principal Java Engineer - Low Latency in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the finance and tech sectors. Attend meetups or webinars related to low-latency systems and Java development. You never know who might have a lead on that perfect role!
✨Tip Number 2
Show off your skills! Create a GitHub repository showcasing your projects, especially those involving performance tuning or microservices. This gives potential employers a taste of what you can do and how you think.
✨Tip Number 3
Prepare for technical interviews by brushing up on your JVM knowledge and performance profiling tools. Practice coding challenges that focus on multithreading and concurrency. We want you to shine when it comes to demonstrating your expertise!
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we love hearing from passionate developers who are eager to tackle complex problems in low-latency systems.
We think you need these skills to ace Senior/Principal Java Engineer - Low Latency in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV highlights your strong Java skills and experience with low-latency systems. We want to see how your background aligns with the core skills mentioned in the job description, so don’t hold back on showcasing your relevant projects!
Craft a Compelling Cover Letter:Your cover letter is your chance to shine! Use it to explain why you’re passionate about working on high-performance trading systems and how your expertise can contribute to our mission. Keep it concise but impactful – we love a good story!
Showcase Your Technical Skills:When applying, make sure to mention any specific tools or frameworks you’ve worked with, like JMH or Kafka tuning. We’re looking for developers who understand the nitty-gritty of performance tuning, so let us know how you’ve tackled these challenges in the past.
Apply Through Our Website:We encourage you to apply directly through our website for a smoother process. It helps us keep track of applications better and ensures you don’t miss out on any important updates. Plus, we love seeing candidates who take that extra step!
How to prepare for a job interview at Juxt Ltd.
✨Know Your Java Inside Out
Make sure you brush up on your Java skills, especially around the JVM. Be prepared to discuss how you've optimised low-latency systems in the past and be ready to dive deep into performance tuning and profiling tools like JMH or async-profiler.
✨Showcase Your Problem-Solving Skills
Be ready to tackle complex, performance-sensitive problems during the interview. Think of examples from your previous work where you’ve had to design elegant solutions under pressure, and don’t shy away from discussing the trade-offs you made.
✨Demonstrate Your Understanding of System Architecture
Familiarise yourself with microservice architectures and event-driven systems. Be prepared to explain how these concepts apply to low-latency environments and share any relevant experiences you have with frameworks like Netty or messaging systems.
✨Communicate Clearly and Confidently
Good communication is key! Practice articulating your design and performance decisions clearly. You might even want to prepare some lightweight documentation or UML diagrams to illustrate your points during the interview.
