24 of 24 Principal Java Engineer Jobs in the UK

Join to apply for the Principal Java Engineer role at Oodle Car Finance 2 days ago Be among the first 25 applicants Join to apply for the Principal Java Engineer role at Oodle Car Finance 25 days holiday (rising to 28 after 3 years … their journey with us. Our Talent Development team is here to support your growth, providing opportunities for learning, development, and career progression. The Role Principal Java Engineer at Oodle Car Finance. As a Principal Java Engineer, you will be a technical leader and subject … matter expert in Java-based software development. You will architect, design, and implement scalable, high-performance systems while mentoring engineering teams and driving best practices. This role requires a deep understanding of Java, modern software architecture, and a passion for innovation and quality. What you'll be getting More ❯

Principal Java Software Engineer London (Hybrid – 1–2 days/week onsite) 🚀 Join a FinTech Powering the Future of Payments Are you an experienced Senior/Principal Java Software Engineer who thrives in a fast-paced, agile environment? Passionate about high-throughput, real-time … transactions across the globe. 🔍 What You’ll Be Doing You’ll join a high-performing engineering team building asynchronous, event-driven systems using modern Java technologies. Design and build scalable, high-availability systems processing millions of real-time transactions Work with Java 17+, Spring WebFlux, AKKA, Kafka, and … Bring We’re looking for Engineers who are pragmatic, performance-focused, and thrive on solving complex distributed systems problems. Strong hands-on experience with Java 11+ (ideally Java 17) Solid knowledge of Reactive Programming (e.g., Spring WebFlux, AKKA) Experience with event-driven architecture, real-time messaging systems (Kafka More ❯

Social network you want to login/join with: Principal Engineer (Java/Kotlin), London Client: Xcede Location: London, United Kingdom Job Category: Other - EU work permit required: Yes Job Views: 1 Posted: 04.06.2025 Expiry Date: 19.07.2025 Job Description: Role: Principal Engineer Stack: Java … is partnering with a FinTech scale-up building a new SaaS platform integrating directly with major banking institutions. What will you do as a Principal Engineer? Lead architectural discussions and act as the technical authority within the engineering team Collaborate with Product Managers and Engineers to optimize solutions … Kotlin, Typescript, AWS) Experience building and designing large-scale engineering platforms Comfortable working with both technical and non-technical stakeholders 3+ years as a Principal/Staff Engineer or Architect Experience working with clients in a commercial environment (consultancy, SaaS, etc.) Preference for experience within SaaS or FinTech More ❯

Social network you want to login/join with: Principal Engineer (Java/Kotlin), Slough Client: Xcede Location: Slough, United Kingdom Job Category: Other EU work permit required: Yes Job Views: 1 Posted: 04.06.2025 Expiry Date: 19.07.2025 Job Description: Role: Principal Engineer Stack: Java … is partnering with a FinTech scale-up building a new SaaS platform integrating directly with major banking institutions. What will you do as a Principal Engineer? Lead architectural discussions and act as the technical authority within the engineering team. Collaborate with Product Managers and Engineers to optimize solutions. … Typescript, AWS). Experience building and designing large-scale engineering platforms. Comfortable working with both technical and non-technical stakeholders. 3+ years as a Principal/Staff Engineer or Architect. Experience dealing with clients in a commercial environment (consultancy, SaaS, etc.). Preference for experience within SaaS or More ❯

Social network you want to login/join with: Principal Engineer (Java/Kotlin), London (City of London) Client: Xcede Location: London (City of London), United Kingdom Job Category: Other - EU work permit required: Yes Job Views: 2 Posted: 16.06.2025 Expiry Date: 31.07.2025 Job Description: Role: Principal Engineer Stack: Java, Kotlin, AWS Location: London, Hybrid (2-4x Month) Xcede is partnering with a FinTech scale-up building a new SaaS platform integrating with major banking institutions. What will you do as a Principal Engineer? Lead architectural discussions and act as the … Typescript, and AWS Experience building and designing large-scale engineering platforms Comfortable working with both technical and non-technical stakeholders 3+ years as a Principal/Staff Engineer or Architect Experience working with clients in a commercial environment (consultancy, SaaS, etc.) Preference for experience in SaaS or FinTech More ❯

Join us as a Principal Engineer, Java, Microservices & API This is a challenging role that will see you design and engineer software with the customer or user experience as the primary objective We'll look to you to actively contribute to our architecture, design and engineering … stakeholder exposure as you build and leverage relationships, as well as the opportunity to hone your technical talents What you'll do As a Principal Engineer, Java, Microservices & API, you'll be creating great customer outcomes via engineering and innovative solutions to existing and new challenges, and … to-end automation, simplification, resilience, security, performance, scalability and reusability Working within a platform or feature team along with software engineers to design and engineer complex software, scripts and tools to enable the delivery of bank platforms, applications and services, acting as a point of contact for solution design More ❯

Social network you want to login/join with: Principal Software Engineer (Java), lisburn col-narrow-left Client: MCS Group | Your Specialist Recruitment Consultancy Location: lisburn, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 5 Posted: 07.06.2025 Expiry Date: 22.07.2025 … used product utilised across multiple industry sectors. With significant investment secured and major scaling plans already underway for 2025, they're looking for a Principal Java Developer to play a pivotal role in the evolution of their core software platform. As their Principal Java Engineer … tracked career progression in a well-funded business which is scaling What You'll Be Doing: Architect and build complex, scalable applications using modern Java and AWS services Set and uphold engineering standards across the team Collaborate closely with product and hardware teams to deliver secure, high-performance systems More ❯

Social network you want to login/join with: Principal Software Engineer (Java), newtownabbey col-narrow-left Client: MCS Group | Your Specialist Recruitment Consultancy Location: newtownabbey, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted: 31.05.2025 Expiry Date: 15.07.2025 … used product utilised across multiple industry sectors. With significant investment secured and major scaling plans already underway for 2025, they're looking for a Principal Java Developer to play a pivotal role in the evolution of their core software platform. As their Principal Java Engineer … tracked career progression in a well-funded business which is scaling What You'll Be Doing: Architect and build complex, scalable applications using modern Java and AWS services Set and uphold engineering standards across the team Collaborate closely with product and hardware teams to deliver secure, high-performance systems More ❯

to make a real impact, grow with a supportive team, and help shape the future of data solutions in trusted sectors. The Role The Principal Java Engineer has a critical role within the Engineering function, tasked with setting technical standards and influencing the architectural decisions that shape … seasoned expert who not only technically leads projects within their domain of expertise but also supports business development efforts through pre-sales engagements. The Principal Engineer will guide the technology strategy, collaborate with cross-functional teams and ensure the delivery of scalable, efficient and innovative software products. This … position is designed for an influential engineer with an extensive technical background and a strategic mindset. As a Principal Engineer, you will lead by example, champion best practices and influence the strategic direction of the overall Engineering team. Technically you will need strong Java and Angular More ❯

Elevate your career by joining MHR, the pioneering SaaS company leading the charge in the UK. We're on the lookout for a visionary Principal Java Engineer to join the PeopleFirst engineering team at MHR. Your Team You’ll be part of our dynamic People First engineering … the most cutting-edge technologies, collaborate with experts, and contribute to the rapid growth of our People First SaaS system. Your Impact As a Principal Java Engineer at MHR, you're not just writing code – you're architecting the future of software solutions. You'll drive excellence … in every aspect, from design through to maintaining a high-quality code base. Collaborate with like-minded Java Developers, shaping innovative solutions, and coaching and mentoring the team to tackle complex business challenges head-on. In more detail: Collaborate seamlessly with delivery, platform, and architecture teams to align the More ❯

Principal Backend Engineer - Java at Capco Location: London (Hybrid) | Type: Permanent The Role Capco is growing our Engineering team – and we’re looking for experienced Principal Backend Engineers with strong Java skills and a passion for delivering innovative solutions in financial services. If you enjoy … solving complex problems, working with cloud-native technologies, and collaborating in agile teams, we’d love to hear from you. As a Principal Backend Engineer at Capco, you’ll contribute to high-impact, client-facing projects that shape the future of financial services. You’ll work alongside talented … will also get the chance to work across different domains within FS & Energy. What You’ll Do - Build and deliver scalable backend services using Java (11, 17+) - Design and implement APIs and microservices for enterprise systems - Work across cloud platforms, particularly AWS, using best practice deployment techniques - Contribute to More ❯

Principal Software Engineer Location: Kent – 2 days onsite A Fintech going through a huge transformation is looking for Principal Engineers to join the team and play a key role in shaping their future technology and engineering practices. As a Principal Engineer, you will apply your … looking for: You have a demonstrated history working in the financial services, specifically in the banking domain. Strong experience working with technologies such as Java and React. Strong understanding of cloud technologies such as Azure (but experience in AWS and GCP will be considered). Benefits: Annual bonus of … including bank holidays). Flexible working arrangements. Alongside other benefits including generous pension contributions, private healthcare, and more. If you are a highly skilled Principal Engineer looking for an exciting opportunity to work on innovative financial solutions, we’d love to hear from you! Apply now! Seniority level More ❯

Role: Principal Engineer 🥞 Stack: Java, Kotlin, AWS 📍 Location: London, Hybrid (2-4x Month) 💰 Salary: Up to £120k-£140k Xcede are partnering with a FinTech Scale up who are building out a brand new SaaS platform integrating directly with major banking intuitions. 🚀 What will you do as … a Principal Engineer? You will be leading architectural discussions and acting as the technical authority within the engineering function Collaborate with Product Managers and Engineers to optimise solutions Engage with clients to both gather requirements and understand problems that need to be solved Setting best practices and elevating … Typescript and AWS) Background building and designing large scale engineering platforms Comfortable working with both technical and non-technical stakeholders 3+ years as a Principal/Staff Engineer or Architect Dealt with clients in a commercial environment (consultancy, saas etc...) Preference for having worked within SaaS or FinTech More ❯

Role: Principal Engineer 🥞 Stack: Java, Kotlin, AWS 📍 Location: London, Hybrid (2-4x Month) 💰 Salary: Up to £120k-£140k Xcede are partnering with a FinTech Scale up who are building out a brand new SaaS platform integrating directly with major banking intuitions. 🚀 What will you do as … a Principal Engineer? You will be leading architectural discussions and acting as the technical authority within the engineering function Collaborate with Product Managers and Engineers to optimise solutions Engage with clients to both gather requirements and understand problems that need to be solved Setting best practices and elevating … Typescript and AWS) Background building and designing large scale engineering platforms Comfortable working with both technical and non-technical stakeholders 3+ years as a Principal/Staff Engineer or Architect Dealt with clients in a commercial environment (consultancy, saas etc...) Preference for having worked within SaaS or FinTech More ❯

used product utilised across multiple industry sectors. With significant investment secured and major scaling plans already underway for 2025, they're looking for a Principal Java Developer to play a pivotal role in the evolution of their core software platform. As their Principal Java Engineer … tracked career progression in a well-funded business which is scaling What You'll Be Doing: Architect and build complex, scalable applications using modern Java and AWS services Set and uphold engineering standards across the team Collaborate closely with product and hardware teams to deliver secure, high-performance systems … continuous learning Stay at the cutting edge-bring new ideas, tools, and methods into the team What We're Looking For: Deep experience with Java (latest versions), Spring Boot, and microservices Strong hands-on knowledge of event driven systems Experience of working in scaling tech companies and/or More ❯

Principal Vulnerability Engineer – Java Security Platform We are seeking a Principal Vulnerability Engineer to join our security vulnerability team for the Java platform. This team handles both offensive (red team) and defensive (blue team) security duties. Responsibilities include proactive research, security tooling, assessments, and … security code reviews. The ideal candidate must have at least 10+ years of hands-on experience in platform security, with deep knowledge of the Java security model. Proven experience in security incident resolution, proactive research using industry-standard tools, and familiarity with Java security issues (including CVEs) are … required. Proficiency in Java, expert-level C/C++ skills, and systems-level programming are essential. The candidate should be a self-starter with strong communication skills and the ability to work independently and remotely. Responsibilities: Proactive research on new vulnerability signatures for the Java platform. Create and More ❯

Principal Software Engineer – Shape the Future of Payments We're hiring on behalf of an innovative payments technology company building the next generation of merchant-first systems. If you're a backend-focused engineer who values autonomy, clarity of purpose, and building products that matter, read on. … Own projects end-to-end — from concept to deployment What You Bring 8–10 years of software engineering experience Strong hands-on experience with Java and backend system design Familiarity with systems integration, messaging middleware, and distributed architecture A pragmatic mindset — you balance clean design with delivering value fast More ❯

We are looking for a Principal Vulnerability Engineer who will be part of the security vulnerability team for the Java platform. This team conducts both the red team (offensive) and blue team (defensive) duties. Responsibilities will include proactive research, security tooling, assessments, and assisting development teams with … security code review. Qualified candidate must have at least 10+ years of hands-on experience in platform security, deep knowledge of Java security model is a must. Minimum 10+ years of hands-on experience with security protocols and best practices are required. Ideal candidate is expected to work independently … Proven past experience in successful security incident resolution and proactive research utilizing industry standard tools is a must-have. Past research and CVEs on Java security issues are a plus. Must have proficiency in Java, and expert level C/C++ skills, and systems level programming. Great personal More ❯

Job Description Java/Kotlin Engineer - Contract Outside IR35 London 2 days per week in London but flexible We're seeking an experienced Java/Kotlin engineer on a contract basis (outside IR35) who is eager to solve complex technical problems, with expertise in developing data … Cassandra). Address challenging engineering problems at scale, ensuring reliability and performance under heavy load. What you'll need: Strong experience in Kotlin or Java (Kotlin preferred). Background in data architectures and large-scale systems. Experience with relational databases (Oracle is a plus, but not essential). Knowledge More ❯

Save job This is a hands-on Principal Software Engineer role within a team working on secure, scalable, and high-performance systems that support critical financial operations.We are looking for a highly skilled individual with computer science expertise, problem-solving skills , and a passion for innovation. This role More ❯

ESPN digital and streaming products and platforms. This includes product engineering, media engineering, quality assurance, engineering behind personalization, commerce, lifecycle, and identity. As a Principal Software Engineer, you will be part of a diverse and talented organization focused on building and maintaining complex sports platform services and applications … industry experience. Mastery of backend platform development technologies and principles. Mastery of software architectural patterns. Extensive experience with Cloud-based architecture. Extensive experience with Java, Kotlin, Rust, Go or other system level languages. Experience with task Automation (GitLab Pipelines, GitHub Actions, TeamCity). Experience with multiple database technologies such More ❯

We are looking for a server-side Java developer to grow the platform even further. You are the kind of person who: Loves writing code and building great applications. Wants to work with a team that treats each other with respect and challenges you to be better. What you … equivalent experience. 8+ years of development experience. Experience working in an Agile environment. Familiarity with SQL and NoSQL databases. Qualifications Does this describe you? Java REST Spring The Ideal Candidate Must have good communication skills. Must have experience working on web applications supporting 1M+ end users or large data … optimization. Understanding how to secure data in a REST architecture. Knowledge of scaling web applications, including load balancing, caching, indexing, normalization, etc. Proficiency in Java/Spring web application development. Experience with Test Driven Development and Agile methodologies; Behavior Driven Development is a plus. Knowledge of Hadoop, Big Data More ❯

Social network you want to login/join with: 2 days per week in London preferred but flexible We're seeking an experienced Java/Kotlin engineer on a contract basis (outside IR35) who is eager to solve complex technical problems, with expertise in building data-intensive, high … e.g., Couchbase, Cassandra). Address challenging engineering problems at scale, ensuring system reliability and performance under heavy load. Requirements: Strong experience in Kotlin or Java (Kotlin preferred). Background in data architectures and large-scale systems. Experience with relational databases (Oracle is a plus, but not essential). Knowledge More ❯

Social network you want to login/join with: 2 days per week in London preferred but flexible We're after an experienced Java/Kotlin engineer on a contract basis (outside IR35) who wants to solve hard technical problems, with experience in building data-intensive, high-throughput … e.g., Couchbase, Cassandra). Solve challenging engineering problems at scale, ensuring reliability and performance under heavy load. What you'll need: Strong Kotlin or Java experience (Kotlin preferred). Background in data architectures and large-scale systems. Experience with relational databases (Oracle a plus, but not essential). Knowledge More ❯