Principal Java Software Engineer

JR United Kingdom; Stevenage; Hybrid; GBP 60,000 - 90,000; Full time

Job summary

A leading FinTech company is seeking a Principal Java Software Engineer in Stevenage to work on high-throughput, real-time payment systems. Candidates should have extensive Java experience and a knack for designing scalable applications. This role offers a hybrid working model and a chance to contribute to impactful projects with major banks.

Benefits

20% performance bonus

Hybrid working model

Collaboration with global banks

Qualifications

• Experience with Java 11+ (preferably Java 17) is a must.
• Familiarity with reactive and event-driven programming is preferred.
• Experience in banking or payments is a plus.

Responsibilities

• Design and build scalable, high-availability systems.
• Write clean, testable code with TDD and BDD.
• Contribute to architectural decisions within Agile teams.

Skills

Java 17+

Spring WebFlux

AKKA

Kafka

TDD

BDD

Reactive Programming

Real-Time Systems

Job description

Social network you want to login/join with:

Principal Java Software Engineer, Stevenage

Client:

Fynity

Location:

Stevenage, UK (Hybrid – 1–2 days/week onsite)

Job Category:

Other

EU work permit required:

Yes

Job Views:

4

Posted:

26.06.2025

Expiry Date:

10.08.2025

Job Description:

Principal Java Software Engineer

Join a FinTech powering the future of payments. We are hiring an experienced Senior/Principal Java Software Engineer to work in a fast-paced, agile environment, focusing on high-throughput, real-time systems that support instant payments for major financial institutions.

Responsibilities include designing and building scalable, high-availability systems using modern Java technologies such as Java 17+, Spring WebFlux, AKKA, Kafka, and more. You will write clean, testable code with TDD and BDD, contribute to architectural decisions, and collaborate within Agile teams.

We seek engineers pragmatic about performance and experienced with Java 11+ (preferably Java 17), reactive programming, event-driven architecture, real-time messaging systems, and CI/CD practices. Experience in banking or payments is a plus but not required.

Benefits include a 20% performance bonus, collaboration with global banks, hybrid working model, and involvement in impactful systems. If you are motivated and ready to make a difference, apply now and shape the future of payments with us.