Backend Software Engineer Java - FinTech

Client Server Ltd.; Newcastle upon Tyne; On-site; GBP 90,000 - 120,000; Full time

Benefits offered by this job

25 days holiday

Social team events

Salary to £120k

Job summary

Client Server Ltd. in Newcastle upon Tyne is seeking a Backend Software Engineer (Java) to modernise a complex trading system. You will join onsite, leading backend Java development for real-time, secure trading platforms.

The role requires strong multithreaded Java skills, knowledge of financial markets, and experience with high-performance systems. Familiarity with Claude AI is a plus, and a 2:1 degree in Computer Science or equivalent is expected.

Qualifications

• Strong backend, multithreaded Java development experience.
• Knowledge of financial markets and trading systems.
• Understanding of real-time system development and latency.
• Comfortable using AI tools such as Claude.
• Collaborative and client-facing communication skills.
• Curious with strong problem-solving abilities.
• C++ understanding is a bonus.

Responsibilities

• Transform a legacy C++ trading system into a modern Java-based application.
• Collaborate with Front Office trading teams and engineers to deliver real-time trading systems.
• Contribute to robust, secure backend systems using Java and Claude.
• Work onsite at the Newcastle office on a full-time basis.

Skills

Backend Java

Multithreaded Java

Trading systems

Real-time latency

Client-facing skills

Critical thinking

C++ knowledge

Claude AI familiarity

Education

BSc in Computer Science (2:1) or equivalent

Tools

Claude AI

Job description

Newcastle upon Tyne, Tyne and Wear | £90k - £120k per year

Backend Software Engineer / Developer (Java) Newcastle onsite to £120k

Do you have expertise with backend Java development within finance / trading environments?

You could be progressing your career in a senior, hands-on Java Developer role at a scaling FinTech.

As a Backend Software Engineer you'll play a key role in a new client engagement to transform a highly complex C++ legacy trading system into a modern Java based application. You'll collaborate with Front Office trading teams as well as other highly skilled software engineers and product teams to deliver robust, secure, real-time trading systems using Java and Claude.

Location:

You'll join the team in Central Newcastle offices on a fulltime basis (Monday to Friday).

About you:

• You have strong backend, multithreaded Java development experience


• You have a strong knowledge of financial markets and have previous experience of working on trading systems


• You have a good understanding of real-time system development and latency


• You're comfortable using AI tools such as Claude


• You're collaborative and pragmatic with client facing communication skills


• You're naturally curious and have advanced critical thinking and problem solving skills


• An understanding of C++ would be of benefit but it's not essential


• You have achieved a minimum 2.1 BSc in Computer Science or similar technical discipline from a top tier / Russel Group university, backed by A's at A-level

What's in it for you?

Alongside a highly competitive package, you'll gain the opportunity to work on technically demanding systems, collaborate with exceptional engineers, and play a meaningful role in the growth of a business that is still small enough for your contributions to have a visible impact.

• Salary to £120k + Bonus


• 25 days holiday


• Social team atmosphere with a range of events