Java Software Engineer Core Java Jobs in UK

Professional job seekers finding United Kingdom jobs through Expertini
750,000+ professionals on Expertini 750,000+ Candidates
Join our global community
Expertini Penguin Mascot Resume Score™
Resume Score™ Instantly
Upload Your CV
Quick 30-second process

Apply Today & Jumpstart Your Career on Expertini, Trusted Since 2008.

Reset

Create Job Alert

 
   
Reset

Senior Application Builder, Ring Application Services

The Ring team is looking for a passionate and talented Senior Application Builder who has experience building world-class Android mobile apps and the ability to design, build, and maintain scalable cloud-based backend systems. You will be responsible for developing mobile applications and cloud services that int ...

Senior Application Builder, Ring Application Services

The Ring team is looking for a passionate and talented Senior Application Builder who has experience building world-class Android mobile apps and the ability to design, build, and maintain scalable cloud-based backend systems. You will be responsible for developing mobile applications and cloud services that int ...

Senior Software Engineer

Python Engineer (Core Trading Platform | Front Office) £80,000-£120,000 base salary plus strong package London - Hybrid We’re hiring Python Engineers to join a front office-facing platform build within a tier-one financial services organisation - this is a green ...

Principal Platform Engineer: AI, Reliability & Leadership (Hybrid/Remote)

LexisNexis Risk Solutions is looking for a Principal Engineer to guide technical direction across teams, focusing on system modernization and AI applications. This full-time role involves collaborating with various teams to enhance reliability and scalability of platforms. Candidates should have extensive backen ...

Senior Fullstack Engineer — Global Commerce Platform (Remote)

A leading audio streaming service is looking for a Senior Fullstack Engineer to enhance its payment infrastructure. The role involves architecting and implementing backend services using Java and Python to ensure payment processing across their platform. The ideal candidate is experienced in modern JavaScript, c ...

Backend Engineer, Core Infrastructure: Scale & Reliability

A leading tech company in Greater London is looking for a Backend Engineer to build and maintain the platform foundations for their services used by over 600M users globally. You will be responsible for ensuring reliability, scalability, and providing developer tooling so that engineering teams can deliver featu ...

Impactful Full Stack Engineer for Trading Platform

A growing investment bank in Greater London is looking for a Full-Stack Engineer to develop trading system components and maintain production systems. Ideal candidates should possess a Bachelor's degree in a relevant field and have practical experience in Java, Kotlin, or Python. This role offers the chance to m ...

Senior Backend Engineer: Cloud Native Microservices & AI

A leading cloud-native video platform is seeking a Senior Backend Engineer to design and build scalable APIs and microservices. This role emphasizes reliability and performance, requiring expertise in Java and AWS, along with a proactive approach to learning. The successful candidate will cultivate a culture of ...

Senior ML Engineer, Personalization Work from Anywhere

A leading technology company in Greater London is looking for a Machine Learning Engineer specializing in Personalization. You will build and scale systems that power recommendations for millions of users. The role requires mid to senior level experience in production ML systems and strong skills in Python, Java ...

Android Security Engineer – Secure Mobile SDKs

A global IT services company is looking for an experienced Android Engineer to join their team in Bristol, UK. This role involves developing high-quality Android components and mobile security features while ensuring adherence to best practices. Candidates should have exceptional knowledge of Kotlin/Java and exp ...

Senior QA Automation Engineer — Lead Testing Strategy

A technology firm in Greater London seeks a Senior QA Automation Engineer to lead quality initiatives and improve automation frameworks. This role includes mentoring engineers and establishing testing standards within Agile teams. The ideal candidate will have significant experience in QA, expertise in test auto ...

Senior Lead Engineer, Post Trade Blockchain & Cloud

A global financial markets provider seeks a Senior Lead Engineer to play a critical role in developing cloud-based market infrastructure. This position emphasizes engineering excellence and requires strong skills in advanced Java, microservices, and agile methodologies. Candidates should be familiar with cloud p ...

Principal Platform Engineer Cloud & Automation

A leading digital retailer is seeking a Principal Platform Engineer to design and maintain cloud infrastructures. This role requires strong troubleshooting skills and expertise in various programming languages, including Java and scripting. You will work closely with engineering teams to enhance platform reliabi ...

Cloud SRE Global Observability Lead (Remote UK)

A leading technology company is seeking a Staff Site Reliability Engineer - Cloud to architect the Observability Centre of Excellence, ensuring reliability and uptime of global platforms. This role involves implementing OpenTelemetry, developing automation scripts, and optimizing platform performance while colla ...

Senior Engineer, Platform & DevOps (Hybrid)

A leading global financial services company in Belfast is seeking a Senior Engineer to lead application systems analysis and programming. Responsibilities include integrating functions, ensuring compliance, and mentoring mid-level developers. Required skills include expertise in multiple programming languages su ...

Principal Platform Engineer: AI, Reliability & Leadership (Hybrid/Remote)

LexisNexis Risk Solutions is looking for a Principal Engineer to guide technical direction across teams, focusing on system modernization and AI applications. This full-time role involves collaborating with various teams to enhance reliability and scalability of platforms. Candidates should have extensive backen ...

Senior Android Platform Engineer – Full Stack Debug

A leading technology company in Greater London is seeking an experienced Android Platform Engineer to tackle complex technical problems across the system stack. The role involves deep technical triage, proactive improvements, and collaboration with engineering teams. Ideal candidates have 5-8 years of hands-on A ...

Backend Engineer – Developer Enablement & Platforms

Citi is seeking a talented server side engineer to join their Chief Technology Office in Belfast, UK. This role focuses on delivering high-quality code for internal tools that drive productivity across the organization. The ideal candidate will have strong skills in Kotlin or Java and experience with RESTful API ...

Senior Site Reliability Engineer: Cloud & Distributed Systems

A technology firm is seeking a Principle Site Reliability Engineer to build and maintain large-scale distributed systems. Candidates should have strong proficiency in programming languages like Golang, Java, or Python, and extensive experience with cloud infrastructure such as AWS, Azure, or GCP. The role is con ...

SRE: Application Reliability & Incident Response (Hybrid)

A technology company is seeking a Site Reliability Engineer to join their SRE team. The ideal candidate should have experience with application debugging in Java, Golang, or Python, solid PostgreSQL skills, and familiarity with Kubernetes. Job responsibilities include investigating incidents, application debuggi ...

Senior Platform Engineer – DevOps & Engineering Excellence

A global financial institution in Belfast is looking for a Senior Engineer to lead and implement application systems reforms. The role demands extensive experience with multiple programming languages such as Java, Go, and Python, as well as a strong understanding of both SQL and NoSQL databases. The successful c ...

Senior Automation Test Engineer: CI/CD & API/UI Automation

IBM is seeking a Senior Automation Test Engineer to join their team in Winchester. In this role, you'll design and develop efficient automated testing solutions for public sector and defence clients, using modern automation tools like Java and Selenium. You'll collaborate with DevOps teams, enhance product quali ...

Senior Automation Test Engineer: CI/CD & API/UI Automation

IBM is seeking a Senior Automation Test Engineer in East Midlands, UK. You will support public sector and defence clients by delivering reliable automated testing solutions. The role involves designing and developing automated test scripts while collaborating with developers and DevOps teams to enhance product q ...

Release Automation Engineer – CI/CD Leader

Allwyn UK in Watford seeks a Release Engineer to manage code releases across test environments, implementing automated processes, and ensuring environment stability. Ideal candidates will have hands-on experience with release management, knowledge of web technologies like Java and SQL, and familiarity with agile ...

AI Driven Integration Engineer (Remote)

Fiskl.AI is seeking a skilled engineer to build financial integrations and automate accounting systems. In this role, you will develop payment and banking integrations while employing AI tools to enhance productivity. Ideal candidates will have over 3 years of experience in backend development, specifically usin ...

Remote Test Engineer: Automation & API

Zaizi is seeking a Test Engineer passionate about technology for a remote role. You will collaborate closely with clients and cross-functional teams to design and build automation frameworks. Key requirements include strong knowledge of Selenium, programming skills in Java, JavaScript, or Python, and excellent c ...

Senior Platform Solutions Engineer (API & Partners)

Wise Australia Investments is seeking a Senior Solutions Engineer to join the Wise Platform team in London. This pivotal role involves providing technical consulting to banks and tech companies, enhancing product offerings, and collaborating across teams to integrate Wise products. Candidates should have strong ...

Backend Engineer, Data Platform — Hybrid (London)

A leading streaming service is looking for a Data Engineer based in London to enhance their data processing capabilities. The role involves collaborating on scalable infrastructure and designing tools to improve efficiency. Candidates should have experience in backend systems using Java and familiarity with dist ...

Backend & API Engineer, Payouts Platform

A leading technology recruiting firm is seeking a Backend/API Engineer to join the Payouts team, focusing on building systems that facilitate money transfers. The role involves designing reliable payout APIs and improving the speed and accuracy of fund transfers, addressing complex challenges at the intersection ...

Application Security Engineer: Threat Modeling & Secure Architecture

A leading global e-commerce company is seeking an experienced Application Security Engineer in Greater London. You’ll conduct application security reviews, design secure architecture, and ensure security across various services. A Bachelor's degree in Computer Science and programming experience in Java, C++, or ...

Lead QA Engineer — Automation & Security Leader

A leading health technology company is seeking a Lead QA Engineer to lead the design and evolution of test frameworks, focusing on automation, performance, and security testing. This role includes mentoring QA engineers and ensuring best practices across teams. Strong hands-on experience in Java programming and ...

Staff ML Engineer Recommender Systems (Remote, London)

A leading social media platform in the UK is seeking a Staff Engineer to enhance its personalization models for 300 million users. The ideal candidate will have over 8 years of experience, strong coding skills in Go or Java, and expertise in machine learning and systems design. This remote role offers the opport ...

Full Stack Engineer — Build Trading Systems, Early Impact

A growing financial technology firm in the United Kingdom is looking for a Full-Stack Engineer to develop key components of their trading system. Ideal candidates will have a background in Computer Science or similar fields and proven coding experience in Java, Kotlin, or Python. This role offers the chance to m ...

Backend Engineer (Remote, UK) – Kotlin, Postgres, Rails

A leading knowledge services firm is seeking a Mid-level Backend Engineer to join their London team. In this remote role, you will design and deploy solutions using Java or Kotlin, and contribute to building scalable technology for a world-leading research platform. The ideal candidate has over 3 years of experi ...

Fintech Project Engineer Secure Transactions

A leading fintech company in London is seeking a qualified Project Engineer to join their IT department. You will develop efficient methods for users to complete financial transactions, addressing potential fraud and enhancing user experience. The ideal candidate has strong programming skills in Java or Python, ...

Principal Engineer – Personalisation & ML Systems

A leading UK retailer is seeking a Principal Engineer to shape their technical direction and lead engineering excellence. The role involves driving strategy, designing scalable systems for personalisation, and mentoring engineers. Ideal candidates will have strong experience in Java or Python, machine learning, ...

Backend Engineer HFT & Crypto Systems (London On Site)

A high-growth blockchain infrastructure company based in Greater London seeks a talented Backend Engineer to develop backend systems for trading and digital asset platforms. The role requires over 5 years of expertise in backend engineering, particularly in high-frequency trading, alongside proficiency in C++, R ...

Senior Backend Engineer Scalable Messaging Platform

hackajob is seeking a Backend Engineer to join their Account Communications team in Greater London. The role involves enhancing customer communications through diverse channels while ensuring system reliability and scalability. Candidates should be proficient in backend programming languages like Java, Kotlin, P ...

Senior Data Backend Engineer, Search Quality

Yelp is seeking a data-oriented backend engineer based in Edinburgh, Scotland, to build and improve backend systems for their Search platforms. You will work with various teams to support prototyping and testing for a smarter search experience. The role requires fluency in Python or Java, experience with SQL/NoS ...

FX Latency Engineer & Tech Lead – Hands on, Hybrid

Citi is seeking a hands-on Java engineer for a full-time role in London. The position involves managing a talented team, implementing solutions in FX Technology, and enhancing system architecture. Candidates should have strong experience in ultra-low-latency development and a proven track record in building syst ...

Automation Quality Engineer CI/CD Test Expert

IBM is seeking a Quality Engineer in Leicester to develop automated tests for applications. You'll work with tools like Selenium and programming languages such as Java and Python. The position involves integrating automated tests within CI/CD pipelines and collaborating with development teams to enhance product ...

Senior Automation Test Engineer – Remote/Hybrid

A leading technical consultancy in the Greater Bristol Area is seeking an experienced Senior Automation Test Engineer. The role involves implementing continuous automated testing within CI/CD pipelines, designing test frameworks, and conducting various testing types including automation, security, and performanc ...

Automation QA Engineer: Cloud & API Testing, Growth Path

Maxwell Bond is seeking an Automation Test Engineer in Leeds. The role involves manual and automation testing using Java, Selenium, and other tools, contributing to the enterprise cloud-native platform. You'll work in a supportive environment with opportunities for quick progression into senior roles. The positi ...

Sports Tech AI Engineer Remote, Learning Fund

Flutter UK & Ireland is seeking a passionate AI Engineer to join our dynamic team in West Yorkshire. You will design, develop, test, and launch innovative solutions, mentor peers, and improve current practices. The ideal candidate has experience with LLM-based applications, programming languages like Python, C#, ...

Senior Backend Engineer, Messaging & Notifications (AI‑First)

Miro is looking for a Senior Backend Engineer to join the Messaging team in Greater London. The ideal candidate will design and implement scalable backend services for notifications and must have over 6 years of backend experience, particularly with Java 17 and distributed systems. Miro offers a global benefits ...

Senior Data Backend Engineer, Search Quality

Yelp is seeking a data-oriented backend engineer in Manchester, UK, to enhance our Search systems. You will collaborate with multiple engineering teams, focusing on building and supporting scalable backend platforms. Qualified candidates should have experience in object-oriented programming languages such as Pyt ...

Senior Full Stack Engineer — TypeScript, AWS & Svelte

Java Script Works is seeking a Senior Full Stack Engineer to join their team in London. The role requires knowledge of Typescript, Svelte, and AWS Serverless, with confidence in learning new technologies being essential. The company offers a competitive salary and bonus as part of its commitment to valuing exper ...

Senior Python Engineer – FinTech, Django & PostgreSQL

Java Script Works is seeking an experienced Python Engineer to join a scaling FinTech company based in Greater London. In this role, you will develop cutting-edge technology that empowers businesses and supports their growth. Preferred qualifications include experience with Django, PostgreSQL, and Front-End deve ...

Principal Front End Engineer: React & TS

Java Script Works is seeking a Principal Front-End Engineer based in Newcastle upon Tyne. This role focuses on leading the development of high-quality UI components using React and TypeScript, while collaborating with designers and backend engineers. Your technical expertise will be crucial in shaping ...

AI Integration Engineer: Multi Agent & Responsible AI

Java Script Works is looking for an AI Integration Engineer based in London, England. The successful candidate will develop capabilities that integrate AI technologies with front-end tools like React and Next.js, focusing on effective autonomous reasoning workflows and responsible AI principles. This i ...

🚀 Boost Your Hiring Chances with Our AI-Powered Tool-Kit

Stand out from thousands of applicants. Use our proven career tools to optimize your applications and land your dream job faster.

To-Do Planner

Organize your job search and personal tasks. All data is confidential.

Open Planner

Wellbeing Center

Access your confidential wellness report and resources to manage job search stress.

Check Wellbeing

Skill Coach

Plan your skill development with O*NET support to stay competitive in your field.

Start Coaching

Outfit Helper

Get AI-powered suggestions on what to wear for your next interview.

Find Outfit

Income Tax Calculator

Plan your finances with our calculator, updated for 2025 tax regulations.

Calculate Tax

Salary Benchmark

Get accurate, AI-supported salary trends to know your worth and negotiate better.

Check Salaries

Interview Practice

Practice for any interview with AI-enabled Q&A sessions. All data is private.

Start Practicing

Interview Predictor

Use our AI-supported tool to predict potential interview questions based on your resume.

Predict Questions

Interview Practice Timer

Use our mock interview trainer to perfect your answers under timed conditions.

Start Timer

Behavioral Mastery

Ace tricky behavioral interviews with our AI-powered practice module.

Master Answers

Question Journal

Confidentially record interview questions you were asked for future reference.

Open Journal

Interview Ace

A comprehensive tool to help you master every aspect of your interviews.

Become an Ace

Q&A Logs

Confidentially track your answers to common questions and refine them over time.

View Logs

Application Planner

Schedule and organize your job applications in one confidential planner.

Open Planner

Cover Letter Tool

Create perfect, tailored cover letters for each application with AI support.

Generate Letter

Resume Score

Get instant feedback on your resume with our NLP-supported analysis tool.

Check My Score

ATS Score

Check your resume's compatibility with Applicant Tracking Systems (ATS).

Check ATS Score

Application Analyzer

Use AI to analyze job descriptions and optimize your application materials.

Analyze Application

Career Visualizer

Confidentially plan and visualize your long-term career path and goals.

Visualize My Career

Offer Genius

Get intelligent insights and strategies to confidently negotiate job offers.

Negotiate Offers

JobFlow

Track your entire job search progress from application to offer with this intelligent tool.

Track My Flow

JobSense

Our intelligent matching engine that provides smart job recommendations.

Get Smart Matches

Networking Toolkit

Tools to build and manage your professional connections. All data is confidential.

Build Network

Professional CV

A classic, O*NET supported template for corporate and professional roles.

Use This Template

Executive CV

A premium, O*NET supported template designed for senior and C-level positions.

Use This Template

Modern CV

A fresh, stylish, O*NET supported template perfect for tech and modern industries.

Use This Template

Creative CV

A visually distinct, O*NET supported template for design and artistic roles.

Use This Template

Minimalist CV

A clean, simple, O*NET supported template that focuses purely on content.

Use This Template

Europass CV

The standard European Union recommended format for wide compatibility.

Use This Template

Student CV

An institution-recommended template perfect for internships and first jobs.

Use This Template

Graduate CV

An institution-recommended template for recent graduates entering the workforce.

Use This Template

Academic CV

The researcher-recommended format for roles in academia and research.

Use This Template

Developer/IT CV

A tech-savvy recommended template to highlight your technical skills.

Use This Template

Skilled Worker CV

A trades-recommended template to showcase hands-on skills and experience.

Use This Template

Monochrome CV

A sleek, black-and-white, O*NET supported template for a professional look.

Use This Template

Art CV

An artist-recommended template that allows your creativity to shine.

Use This Template

Harvard CV

A researcher-recommended template based on the classic Harvard format.

Use This Template

Volunteer Research

Help us improve our platform by joining our community research program.

Join Research

Review Us

Share your experience with our tools to help other job seekers.

Share Experience

Register

Create your free account to save jobs, build your profile, and track applications.

Create Account

Login

Access your dashboard, manage applications, and continue your job search.

Access Your Account

Profile Builder

Create a comprehensive professional profile that attracts recruiters and showcases your skills.

Build Your Profile

View Profile

See your public profile exactly as employers will see it. Make sure it's perfect.

Preview Profile

Bookmarked Jobs

Keep track of all your saved job opportunities in one organized place.

View Saved Jobs

Your Reviews

View and manage all the company reviews you've submitted.

See Your Reviews

Following

Manage the list of companies you follow to stay updated on their new openings.

Manage Following

Find Companies

Discover and research top employers in your country and industry.

Discover Employers

Standalone CV Builder

Use our O*NET supported CV builder to create a professional resume from scratch.

Build Your CV

PDF to DOC (Beta)

Convert your PDF resumes or documents into editable Word (DOC) format.

Convert PDF

DOC to PDF (Beta)

Create universally compatible PDF documents from your Word (DOC) files.

Create PDF

General FAQ

Find answers to common questions about our job site and platform.

Read FAQ

Job Seekers FAQ

Get help and find answers to questions specifically for job seekers.

Get Help

Job Matching

Learn about the technology and algorithms behind how we match you to jobs.

Learn How

Personalized Matching

Discover how we use your profile and activity to provide customized job suggestions.

Learn More

Quick Apply

Understand our fast application process and how to make the most of it.

Learn More

Alert Frequency

Learn how to manage your job alert settings so you get the updates you want.

Manage Settings

Job Alerts Guide

A complete guide to understanding how job alerts work and how to use them effectively.

Read Guide

Resume Matching

Learn how our system matches your resume to job requirements.

Learn More

Ethical Branding

Read our guide to building a professional and ethical personal brand.

Read Guide

Candidate Visibility

Learn how to increase your visibility to recruiters on our platform.

Increase Visibility

Verified Badge

Find out how you can get a verified badge to build trust with employers.

Get Verified

AI ATS Technology

Learn about the advanced AI and ATS technology that powers our platform.

Learn More

ATS Ranking

Understand how Applicant Tracking Systems rank you as an applicant.

Learn More

Semantic Matching

Learn how our AI-powered semantic matching goes beyond keywords.

Learn More

    Java Software Engineer Core Java Jobs in United Kingdom Job Search Guide, Trends and Insights