Upwork home
Sign up
Secondary

Hire the best Java Developers in London, ENG

Check out Java Developers in London, ENG with the skills you need for your next job.
Hire freelancers
  • $45 hourly
    • 4.9/5
    • (18 jobs)
    Hi, I’m Roman — a highly experienced mobile developer with 8+ years of proven success building mobile applications that skyrocket to the top of the App Store and Google Play. I’m passionate about crafting clean, scalable architecture and, above all, fostering transparent and effective communication throughout every stage of development. Whether it’s taking the lead on React Native development, conducting code reviews, collaborating with clients, or interviewing candidates — I bring both technical skill and strategic insight to the table. 🔧 My Tech Stack: 🎯 TypeScript, JavaScript 🎯 React Native, React.js, Next.js 🎯 Node.js 🎯 Kotlin / Java (Android Studio) 🎯 Swift / Objective-C (Xcode) 🎯 Firebase, Firestore 🎯 MongoDB, SQL 🤝 Why Partner With Beyond Codeline: ✅ 30+ successful Upwork projects — all with 5-star reviews ✅ 97% of our clients receive fully cash-free, production-ready apps ✅ Work with a hand-picked team of senior developers, designers & project managers ✅ Clear, direct communication — always available on Slack ✅ Agile & Scrum methodology tailored to your project’s unique needs ✅ Remote-friendly process optimized for any time zone ✅ Honest feedback, complete transparency, and no over-promising Have an idea you’re ready to bring to life? Let’s build something amazing together — just send me a message 🙌🏻
    Featured Skill Java
    MySQL
    HTML
    React Native
    jQuery
    React
    SQL
    CSS
    JavaScript
    C++
  • $75 hourly
    • 5.0/5
    • (37 jobs)
    🎖️ 𝗘𝘅𝗽𝗲𝗿𝘁-𝗩𝗲𝘁𝘁𝗲𝗱 Lead Software Engineer (Top 1%) ✅ 𝟭𝟬+ 𝘆𝗲𝗮𝗿𝘀 𝗲𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲-𝗴𝗿𝗮𝗱𝗲 𝘀𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 experience, working with industry-leading organizations. 📐 𝗣𝗿𝗼𝗳𝗲𝘀𝘀𝗶𝗼𝗻𝗮𝗹. Lead Software Engineer and Full Stack Engineer, specializing in AI, Cloud Infrastructure, and DevOps, helping companies achieve scalable and cost-efficient solutions. 🤝🏼 𝗧𝗿𝘂𝘀𝘁𝗲𝗱. 700 hours contributed on Upwork, consistently delivering high-impact, innovative projects for clients worldwide. 🏅 𝗦𝘂𝗰𝗰𝗲𝘀𝘀. Directed and managed teams of 15-30 software engineers, ensuring efficient project delivery and high-quality outcomes. ⛱️ 𝗣𝗲𝗮𝗰𝗲 𝗼𝗳 𝗠𝗶𝗻𝗱. Successfully developed solutions for Fortune 500 clients in industries such as finance, healthcare, retail, and technology. 🧠 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲. Specialization in cloud architecture, AI/ML integration, full-stack development (React, Node.js, Python), and DevOps (Docker, Kubernetes). 🔧 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲. Delivered solutions using technologies such as AWS, Azure, GCP, ASP.NET, and more. Experience working with C#, Java (including Java 17), Python, and JavaScript, specializing in cloud and microservices architectures using AWS, Azure, and Spring. Proficient in full-stack development with React, Next.js, and Redux for front-end, and strong expertise in back-end with C#, .NET, and Java Spring Boot. Skilled in DevOps practices, using tools like Jenkins, Bitbucket pipelines, and Docker for CI/CD automation. Extensive work with APIs, payment processor integration, and database systems such as MongoDB, SQL Server, and MySQL. Bringing extensive experience in Odoo, including customizing modules, integrating third-party applications, and optimizing business processes through tailored ERP solutions. Skilled in automating workflows and extending Odoo's capabilities using Python, leveraging its framework to create scalable and efficient business solutions. My deep understanding of cloud and microservices architectures, especially within AWS and Azure environments, enables seamless integration of Odoo with cloud-based services. Producing MVP products with quick turnarounds, leveraging No-Code tools for fast prototyping, workflow automation, and scaling digital solutions without heavy reliance on custom code. Proficient in platforms like Bubble, Webflow, Airtable, and Zapier, enabling the creation of web applications, seamless API integrations, and business process automation. Expertise in building data-driven applications, managing backend workflows, and crafting customer-facing interfaces to reduce time to market. This approach allows for fast iterations, immediate feedback, and a streamlined path from concept to MVP, essential for startups. I specialize in designing and deploying cloud-based architectures with an emphasis on scalability, performance, and seamless integrations. With a strong ability to act as a liaison between technical teams and business stakeholders, I ensure clear communication and alignment on project goals. My expertise includes building complex integrations across diverse systems, including APIs, cloud platforms, and third-party services. I’m dedicated to promoting coding best practices, mentoring teams, and driving improvements in DevOps processes to ensure efficient, reliable deployments. I lead a highly skilled in-house team specializing in cloud-based architectures, AI-driven solutions, and DevOps optimization. Together, we deliver scalable, high-performance systems tailored to meet client needs. With a proven track record in enterprise-level digital transformations, we focus on seamless integration of complex systems and APIs across cloud platforms like AWS and Azure. Our team is dedicated to code excellence, continuously improving development processes and mentoring junior developers, ensuring reliable and efficient project delivery from start to finish. 𝐂𝐨𝐦𝐩𝐥𝐞𝐭𝐞 𝐥𝐢𝐬𝐭 𝐨𝐟 𝐬𝐤𝐢𝐥𝐥𝐬: Odoo, C#, Java, Python, JavaScript, TypeScript, T-SQL, C, C++, Objective-C, HTML5, CSS3, XML, and jQuery. My expertise extends to frameworks like ASP.NET, React, Node.js, AngularJS, Django, Spring Boot, and .NET. (AWS, Azure, GCP), DevOps tools (Kubernetes, Docker, Jenkins, Terraform, Azure DevOps), and mobile development (iOS, Android SDK). No Code, Bubble, Airtable, Webflow, Zapier, CMS systems, Sitecore, SharePoint, and Salesforce, SQL Server, MySQL, and MongoDB, and advanced skills in API integration, payment processing, microservices architecture, full-stack development, GDPR compliance, and SOC2 security.
    Featured Skill Java
    AWS CloudFormation
    CI/CD Platform
    Spring Boot
    RESTful API
    React
    .NET Core
    SQL
    .NET Framework
    Spring Framework
    Blockchain
    API
    Next.js
    Docker
    Python
    Node.js
    Amazon ECS
  • $50 hourly
    • 5.0/5
    • (3 jobs)
    Hello! I'm a seasoned professional with over a decade of experience in the realms of engineering education, software development, and data engineering. My journey began with a 10-year tenure running a tutoring business in engineering disciplines, including Mechanical, Aerospace, and Electrical, where I honed my skills in effective communication and received awards for my business acumen. I hold a BEng in Mechanical Engineering and an MSc in Mathematics, specializing in financial mathematics. This academic background paved the way for my coding expertise, leading to a lecturer position at a university. There, I taught a variety of subjects, including mathematics, data science, data visualization, and programming for aerospace engineers. Transitioning to the industry, I served as an Investment Engineer, where I developed backend code for complex financial systems in Python, catering to significant financial institutions like pension funds and asset managers. My role evolved into full-stack development, encompassing Java, JavaScript, TypeScript, financial calculations, and client-facing front-end visualizations. In the realm of data engineering, I am experienced in managing financial data, utilizing tools like Airflow, Lipper, Morningstar, Snowflake, and Databricks. My interest in advanced technology led me to part-time research in Explainable AI, where I developed internal systems and tools leveraging AI for organizational benefit. I'm here to offer my expertise in web development, AI integration, and data engineering. Whether you're looking for a comprehensive web app, AI-enhanced business solutions, or efficient data automation, I bring a wealth of knowledge and experience to ensure your project's success.
    Featured Skill Java
    Data Engineering
    Apache Airflow
    React
    Quantitative Analysis
    AI Builder
    TypeScript
    Python Script
    JavaScript
    Data Science
    Data Analysis
    Python
  • $70 hourly
    • 5.0/5
    • (29 jobs)
    🇺🇦 🌍 Ukrainian based in London ✅ 12+ years of experience in different technologies. 🚀 Application from idea to release ⌨️ Post-release maintenance and support 📱 30+ successfully developed applications ✅ Upwork Verified Top Rated Plus Developer ⭐⭐⭐⭐⭐ rating Welcome to my profile! With over a decade of dedicated development experience, I specialize in creating cutting-edge applications that deliver user-friendly, engaging, and performant experiences. My proficiency in product development enables me to bring any app idea from concept to launch seamlessly. My approach is collaborative and transparent, ensuring that communication is clear and expectations are aligned from the outset. I pride myself on my ability to solve complex problems and adapt to new challenges, which is reflected in the diverse range of projects in my portfolio. Clients appreciate my commitment to quality and attention to detail, whether I'm working on innovative startups or established enterprises. My goal is to not only meet but exceed your mobile app development needs, providing post-release support to ensure your application evolves with your business. I am Upwork Verified and have a track record of success, with consistent five-star feedback. If you're looking for a reliable, skilled, and proactive mobile developer, let's connect and bring your vision to life.
    Featured Skill Java
    Project Management
    FinTech
    Dart
    User Authentication
    Smartphone
    Chat & Messaging Software
    JavaScript
    Swift
    Flutter
    TypeScript
    Android
    iOS
    Kotlin
    Native App Development
  • $20 hourly
    • 4.7/5
    • (54 jobs)
    🏆 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗖𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝗼𝗿 I bring over 8+ 𝘆𝗲𝗮𝗿𝘀 of experience in Development Technology, with expertise across various domains. 💼 𝗖𝗼𝗿𝗲 𝗦𝗸𝗶𝗹𝗹𝘀 & 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: 🔹 Backend Interaction: REST API, JSON, XML 🔹 Social Media Integration: Facebook, Twitter, Instagram, Google, Apple 🔹 Real-time Communication: XMPP, Socket, Firebase, Twilio, Agora 🔹 Payment Integration: PayPal, Stripe, Square 🔹 Geolocation & Mapping: Google Maps, Apple Maps, GPS, Location Tracking 🔹 Live Streaming: Audio/Video Streaming 🔹 Push Notifications & Analytics: Firebase, FCM, Firestore, Firebase Analytics 🔹 AI & Chatbots: ChatGPT, OpenAI, AI Integration 🔹 Version Control: GitHub, GitLab, Bitbucket 🔹 MERN Stack: MongoDB, Express.js, React, Node.js 🔹 Java Full Stack: Spring Boot, Hibernate, JPA 🔹 DevOps & Containerization: Docker, Kubernetes 🔹 Microservices Architecture: Scalable, maintainable solutions 🔹 API Development: Seamless API integration 📌 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: Over the past decade, I’ve developed a diverse range of apps across multiple industries, including: 🛎️ Fintech: Payment apps, budgeting tools 🛎️ Healthcare: Telemedicine, health records apps (HIPAA-compliant) 🛎️ E-commerce: Shopping apps, delivery tracking 🛎️ Real Estate: Property listing apps, mortgage calculators 🛎️ Education: E-learning platforms, quiz & assessment apps 🛎️ Travel & Tourism: Travel booking apps, tour guide apps 🛎️ Food & Restaurant: Food delivery, table reservation apps 🛎️ Entertainment: Streaming apps, event ticketing 🛎️ Automotive: Car rental, vehicle tracking apps 🛎️ Fitness & Wellness: Workout tracking, nutrition apps 🛎️ Social Networking: Social media, dating apps 🛎️ IoT & Bluetooth: IoT control apps, smart device control 🛎️ Blockchain & Cryptocurrency: Wallet apps, blockchain solutions 🌟 𝗪𝗵𝘆 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲? 🔹 Uncompromising Quality: High-performance apps tailored to your needs, built with precision and attention to detail. 🔹 Timely Delivery: I pride myself on delivering projects on time, every time. 🔹 Full-stack Expertise: From Android and iOS to backend systems and databases, I have the skills to handle your entire project. 🔹 Cutting-edge Technologies: Always up-to-date with the latest AI, IoT, and AR trends. 🔹 Cost-effective Solutions: I offer top-quality results without breaking your budget. 🔹 Long-term Partnerships: I focus on building lasting client relationships through trust and high-quality work. 🔹 Love to accept challenging work. 🔹 Availability of presence for work. 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗜 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵: 🔸 Mobile Development: Kotlin, Java (Android), Swift, Objective-C, SwiftUI (iOS) 🔸 Cross-Platform: Flutter (Dart), React Native 🔸 Backend & Web Development: Node.js, PHP, Python, Laravel, Express.js, Django 🔸 Frontend Development: React.js, HTML5, CSS3, JavaScript, Bootstrap, jQuery 🔸 Databases: SQLite, MySQL, MongoDB, PostgreSQL 🔸 DevOps: Docker, Kubernetes, GitLab CI/CD 🔸 Latest Trends: AI, IoT, Blockchain 💬 𝗙𝗥𝗘𝗘 𝗖𝗢𝗡𝗦𝗨𝗟𝗧𝗔𝗧𝗜𝗢𝗡: I offer a free consultation to explore how we can collaborate and achieve your project goals. Let's schedule a quick introductory call to discuss your needs and how I can assist you. Even if we don't end up working together, you'll walk away with valuable tips and insights that could benefit your project. Simply click the '𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯' button, and let's start a conversation to see what we can create together! 🙌 𝗧𝗵𝗲 𝗸𝗲𝘆𝘄𝗼𝗿𝗱𝘀 𝘁𝗼 𝗳𝗶𝗻𝗱 𝗺𝗲: Mobile App Developer, Mobile App Development, Android App Development, iOS App Development, Native App Development, Android Developer, iOS Developer, Cross-Platform Development, Custom App Solutions, Backend Development, Full Stack Developer, API Integration, Mobile UI/UX Design, Kotlin Developer, Swift Developer, Java Developer, SwiftUI Developer, Flutter Developer, Dart Developer, React Native Developer, Node.js Developer, PHP Developer, Python Developer, Laravel Developer, Express.js Developer, Django Developer, React.js Developer, HTML5 Developer, JavaScript Developer, jQuery Developer, Bootstrap Developer, Firebase Developer, AWS Developer, Google Cloud Developer, Docker Developer, Kubernetes Developer, DevOps Developer, Mobile App Design, expert-level iOS app development. Regards, Ravi Jasoliya
    Featured Skill Java
    Docker
    Hibernate
    Spring Boot
    Web Design
    Mobile UI Design
    iOS Development
    Mobile App Development
    React
    Dart
    React Native
    Android
    Flutter
    Swift
    Hybrid App Development
  • $60 hourly
    • 5.0/5
    • (26 jobs)
    I'm employed as a professional Software Developer and simply love coding. I have extensive experience and tackle complex problems on a daily basis, therefore I'm ready to take on any issue you need to solve. Being from the UK and am a native speaker, having graduated from University with a degree in Computer Science, I have expert knowledge of the field. I'll be excited to provide you with an immaculate service. Enjoy affordable, professional quality.
    Featured Skill Java
    NetSuite Development
    SuiteScript
    Android App Development
    Angular 6
    Android
    Firebase
    SQL
    JavaScript
    TypeScript
  • $63 hourly
    • 5.0/5
    • (14 jobs)
    Android software engineer, looking for contract work. Flexible in terms of the amount of hours, happy with 8 hours a day but open to part-time engagements too. I am great at communication, distance/time-zone is not an issue. Currently nomading around EU. I can guarantee overlap: minimum 4 hours in your usual work-day (for example). I'm a highly focused software developer with 13 years of experience in the tech industry, 4 in fast-paced start-ups (Facebook, Hailo, Deliveroo). A bit about my motivations: I'm passionate about creating tools. Tools that are simple, easy to use and fit into the users general experience of Android apps. What I bring to the table is caring about your product and your domain. I'm very curious about how the app is actually going to be used in real life. This allows me to give you suggestions regarding what's technically possible and allow you to make informed cost/benefit trade-offs. I also write clean, well architected code that doesn't make the next developer curse my name. Skills: Android, Android Studio, Kotlin, Java, REST, RxJava/RxKotlin/RxAndroid, dependency injection (Dagger 2), CLEAN architecture, MVP, MVVM, Material design, database (Room, SQLite), analytics, Firebase, social authentication, push notifications, release on Play Store, continuous integration (Bitrise, Jenkins), testing (JUnit, Mockito)...
    Featured Skill Java
    User Authentication
    Smartphone
    Kotlin
    Android
    Continuous Integration
    Unit Testing
    Automated Testing
    Dagger 2
    Material Design
    Firebase
    Google Play
  • $35 hourly
    • 4.5/5
    • (18 jobs)
    As a product manager as well as having the technical knowledge, I will be able to help in the development of your project. In the last number of years, I have been working on product development including SaaS products and looking at product market fit. Some of the key skills I have is as follows: 1. Web application development with Laravel 5, CodeIgniter 3, Yii2, Symphony2, CakePHP and Node.js. 2. Bootstrap 4 / material design, HTML5, CSS3, XML, JavaScript and JQuery to design pixel perfect templates. 3. Angular JS, React JS and Vue JS. 4. WordPress theme and plugin development. 5. Databases – MySQL, SQL, Graph database, PL/SQL, PostgreSQL, MS SQL, Firebase, Oracle and MongoDB. 6. Social Media and Online Payments Integration on Web and Mobile Platforms. 7 Server setup and improve any business site with open source platforms like Magento, Drupal. Achieved stable understandings on various web frameworks and tools. 8. Languages: C, C++, Java, PHP, Python, JavaScript, typescript, ASP.Net. I can use open source CMS but we prefer to build your own, so that you expand and upgrade its functions. I also offer to manage the website/application on a cloud environment, ensure timely backup is made, provide on-going support on the development with an annual small license fee and also host/manage your hosting. Our main goal is to meet your expectation and retain your services for the future. Being honest and trustworthy is an essential part of our business ethos.
    Featured Skill Java
    Laravel
    Symfony
    CodeIgniter
    React
    Ecommerce Website Development
    UX & UI
    Responsive Design
    Search Engine Optimization
  • $75 hourly
    • 5.0/5
    • (31 jobs)
    PROFILE • Software Development professional with more than 20 years experience in full cycle development and a proven track record of meeting clients' expectations and producing user-friendly applications. • Senior Full Stack Developer / Consultant with strong server-side and front-end experience. • Deep experience in highly concurrent scalable web applications and enterprise platforms. • End-to-end architecture and implementation of client-server systems. • Technical troubleshooter of enterprise software projects • Immense expertise in software project along with hands-on software architecture design and development experience. • Accomplished manager, team builder, software development life cycle management expert connoisseur ARCHITECTURE, METHODOLOGIES AND TECHNIQUES • Microservices Architecture • Test Driven Development (TDD) • Object Oriented Programming & Fundamental OOP Design Patterns • MVC Architectural Pattern • Inversion of Control and Dependency Injection • Anti-Patterns of Software Engineering to Avoid • Agile (Scrum, Kanban), Sequential (Waterfall) Development Practices • DevOps Culture - Continuous Integration and Continuous Delivery (CI/CD)
    Featured Skill Java
    P5.JS
    Software Design
    Three.js
    Software
    Database
    Kotlin
    JavaScript
    Python
    C#
    TypeScript
    Software Architecture & Design
    Microservice
    React
    NFT Collection Generation
    Jakarta EE
  • $50 hourly
    • 5.0/5
    • (9 jobs)
    Hey, I’m Dan – a battle-tested recruiter with nearly a decade of experience helping some of the world’s most ambitious companies scale their technical teams. I’ve partnered with global giants like Amazon and Dassault Systèmes, as well as fast-moving Web3 and FinTech startups – delivering top-tier talent in record time. I currently operate a high-performance technical recruitment agency and also work independently with select clients – giving me unmatched agility, resources, and insight to solve your technical hiring challenges at speed. I have extensive experience in high level technical global hiring including Crypto/Blockchain, Software Developers, Business Intelligence Engineers, Data Engineers, Product Managers, Software Testers (Both Manual & Automation) & technical leadership positions (CTO, Head of Development/technology, technical leads). I specialise in conducting high level sourcing, leveraging conventional and non-conventional channels to maximise the pipeline and position the role to candidates in order to attract them. Part of my role is to Collaborate with business leaders to build and deliver GTM recruitment strategies and help contribute to maximising growth. For many of my freelance clients I perform candidate interviews based on behavioural and technical competences to help streamline your recruitment process.
    Featured Skill Java
    Cryptocurrency
    Node.js
    Resume Writing
    Visualization
    iOS
    React
    Lead Generation
    Sales
    Python
    PHP
    Blockchain
    Recruiting
    HR & Business Services
  • $40 hourly
    • 5.0/5
    • (1 job)
    I have 7+ years of experience developing Android App. I am very experience using software architecture and tools, including MVVM, MVP, Android JetPack, Dagger, RxJava, Junit and Git I have 3 years of experience using Kotlin and 15 years using Java. Java Certifications: Java Programmer(OCJP), Java Software Developer (OCJD), Java Web Developer(OCWCD)
    Featured Skill Java
    RxJava
    Model View Presenter
    Android Room Persistence
    Dagger 2
    Model View ViewModel
    Android App Development
    JUnit
    Kotlin
    SQLite
  • $50 hourly
    • 5.0/5
    • (1 job)
    Hello! I'm a highly experienced software developer with over 15 years of expertise in building scalable, efficient, and user-centric applications. My skill set spans a wide range of technologies, including Java, JavaScript, React, React Native, Next.js, and AWS, enabling me to deliver end-to-end solutions for complex projects. I thrive on helping businesses achieve their goals by developing reliable software systems that are tailored to their specific needs. Whether it's architecting cloud-based infrastructures, creating dynamic front-end applications, or enhancing existing systems, I bring a professional and detail-oriented approach to every project. Here’s what I bring to the table: Backend Mastery: Proficient in Java, Spring Boot, RESTful APIs, and microservices architecture. Frontend Expertise: Crafting interactive user interfaces with React, Redux, Next.js, and modern JavaScript (ES6+). Mobile Development: Building robust, cross-platform mobile apps with React Native. Cloud Solutions: Developing secure and scalable cloud applications with AWS (EC2, S3, Lambda, CloudFormation). Collaborative Problem-Solving: Adept at working in cross-functional teams and understanding client needs. Let’s collaborate to turn your ideas into robust and impactful software solutions. I’m eager to discuss how I can contribute to your project—feel free to reach out anytime!
    Featured Skill Java
    Spring Boot
    Microservice
    Web Development
    Apache Kafka
    React Native
    Next.js
    React
    JavaScript
  • $120 hourly
    • 5.0/5
    • (14 jobs)
    🚀 15+ Years Experience | 10x Engineer | Trusted by Fortune 500 Companies | Expert in Microservices & API Integration Projects 🏆 Delivered 20+ enterprise Java and SDLC projects with a typical 20% to 50% improvement in DORA metrics (deployment frequency, lead time, MTTR, change failure rate) ⭐️ I am a highly skilled Java Developer and DevOps Engineer with 15+ years experience in Back-End Development, specializing in Microservice Architectures and bespoke API Integration. I build robust, scalable solutions and lead complex projects with a focus on clean code and solution quality. 🛠️ What I Offer 💼 Value Delivery - I blend technical expertise with business insights to deliver real value fast. 🔄 Spring Boot Microservices - Crafting modular services that scale effortlessly. 🏗️ Monolith-to-Microservices - From legacy application to cloud-ready architecture, with up to 85% improved resource utilization and 60% faster feature time-to-market. 🔧 Enterprise Modernization - Revitalizing outdated systems with cutting-edge technology. 🚀 Startup MVP Development - From idea to viable products in fast-paced environments. ⚡ Core Expertise ✅ TDD/BDD/ATDD - Test-Driven Development is at the core of how I work with clients. ☁️ Microservices & Cloud - Resilient systems using Docker, Kubernetes, AWS, GCP & Azure. 🔄 CI/CD Pipelines - Reliable deployments using e.g. Jenkins, GitLab CI and GitHub Actions. 🔌 REST API Development & Integration - Building secure, high-performance web services. 🔗 Third-Party API Integration - Payment gateways, social media, maps, AI agents and more. 📊 Agile Development - Transparent, adaptive planning and iterative requirement discovery. ⚙️ Software Automation Solutions - Specialist tools and techniques to streamline the SDLC. 🤝 Why Work With Me? I consistently deliver projects on time and within scope, from lean startup apps to large enterprise systems. My collaborative approach ensures solutions align with your business goals and user needs. Having worked as a hands-on developer, software architect, team lead, and startup co-founder, I effectively bridge technical and business discussions while staying current with the latest technologies. 🌟 My Goal To build long-term partnerships by delivering quality results with professional service. If you need a dedicated Back-End Development partner to architect Microservices, integrate complex APIs, or streamline your DevOps pipeline, let's discuss how I can contribute to your project's success! 📈
    Featured Skill Java
    AI Consulting
    Automation
    Minimum Viable Product
    Back-End Development
    REST API
    API Framework
    Domain-Driven Design
    Clean Architecture
    Spring Boot
    API Integration
    DevOps
    Kubernetes
    API Development
    Agile Software Development
  • $75 hourly
    • 5.0/5
    • (5 jobs)
    Experienced SDET/Automation Tester with a high record of finding bugs using manual and automation techniques. I have created many Test Automation frameworks from scratch for both UI and Back End services which included component and E2E testing, and will tailor framework to the needs of the objective. I also have deeply delved into both test automation for both security and performance testing and have setup pipelines in the sectors of government intelligence agencies, banking and retail
    Featured Skill Java
    Quality Audit
    Security Testing
    Rest Assured
    Test Automation
    Spring Boot
    Test Development
    Test Automation Framework
    QA Engineering
    Selenium WebDriver
    RESTful API
    SQL
    Cucumber
    Performance Testing
    Functional Testing
  • $70 hourly
    • 4.9/5
    • (6 jobs)
    I'm a developer with extensive experience in big tech companies, including Google, Palantir and Amazon. I hold bachelor's and master's degrees in Computer Science from King's College London. I have a wide-ranging set of skills that allows me to work on various stacks and technologies. I have a solid academic background in computer science which built a strong foundation of theoretical knowledge that enables me to grasp different concepts quickly. My experience in big tech companies has shaped my work ethic to be flexible, quick & innovative, and I understand the client's demands and needs thoroughly. - I have 5 years of experience in designing and implementing cloud software systems with AWS and GCP - I have 4 years of experience in Software Development with Python, Golang, Java and JavaScript - I can fully manage and complete your project based on the requirements and needs that you state - I value strong communication and project management, meaning that I will give you accurate deadlines and readily communicate progress updates
    Featured Skill Java
    JavaScript
    Mobile App Development
    Python
    PHP
    Cloud Computing
    Automation
    Golang
  • $60 hourly
    • 5.0/5
    • (7 jobs)
    I'm a full-stack developer who have previous experience developing app, websites and working with complex data. Whether you're trying to solve a technical bug or launch an app for your consumers, I can help! - Experienced in Java, Python, MySQL, HTML and iOS - Full project management from start to finish - Clear and regular communication is important to me, so let's keep connected
    Featured Skill Java
    Product Management
    Search Engine Optimization
    Database
    iOS
    Django
    CSS
    Digital Marketing
    HTML
    Web Development
    MySQL
    Excel Formula
    Python Script
    Python
  • $75 hourly
    • 5.0/5
    • (1 job)
    Innovative Software Engineer Delivering Top-Notch Digital Solutions Welcome to my Upwork profile! I’m Jethro Au, a dedicated software engineer with a passion for creating seamless and high-performance digital experiences. Whether you need sophisticated front-end interfaces or robust back-end systems, I bring a comprehensive skill set to ensure your project’s success. What I Offer: Full-Stack Expertise: As a software engineer, I am proficient in both front-end and back-end development. I specialize in building dynamic user interfaces with React.js and TypeScript, while also delivering efficient server-side solutions using Node.js and various database technologies. High-Quality Designs: My ability to translate detailed Figma designs into responsive, visually engaging web applications ensures that your project not only meets functional requirements but also excels in user experience and aesthetic appeal. Attention to Detail: I am committed to precision and quality in every project. My work is characterized by meticulous attention to detail, ensuring that each aspect of your application is polished and performs flawlessly. Seamless Integration: From implementing RESTful APIs and GraphQL to integrating complex data models, I ensure smooth interaction between front-end and back-end components, resulting in a cohesive and efficient application. Creative and Effective Solutions: I approach every project with a creative mindset and a problem-solving attitude, aiming to provide solutions that not only meet your needs but also exceed your expectations. Why Work with Me? With a blend of technical expertise and creative problem-solving, I am dedicated to delivering exceptional software solutions that enhance your project and elevate your brand. My goal is to provide you with a product that stands out for its functionality, design, and performance. Ready to turn your vision into reality? Browse my portfolio and let’s discuss how I can help bring your project to life with precision and excellence.
    Featured Skill Java
    Front-End Development
    Back-End Development
    Software Development
    Full-Stack Development
    MongoDB
    Next.js
    CSS
    JavaScript
    React
    MySQL
    HTML
    PostgreSQL
  • $55 hourly
    • 5.0/5
    • (3 jobs)
    I’m a seasoned backend developer with over five years of hands-on experience in crafting robust, high-performance systems for industries ranging from AdTech and IoT to FinTech and Automotive. Whether you need a custom API, a seamless cloud migration, or a scalable backend architecture, I’m here to help! • Backend Development: Java, Spring Boot, Kafka, Kotlin, and Quarkus for building reliable, scalable solutions • Cloud Proficiency: Skilled in AWS architecture and Terraform for efficient cloud deployments and cost savings • Legacy System Migration: Expertise in upgrading legacy systems to modern platforms, reducing costs and boosting performance • Collaborative & Communicative: Worked across diverse teams, ensuring smooth project rollouts and seamless transitions I’m passionate about backend excellence and delivering solutions that truly make a difference. Let's keep in touch and discuss how I can support your project needs!
    Featured Skill Java
    GraphQL
    REST API
    Google Cloud Platform
    Docker
    Terraform
    Kubernetes
    MongoDB
    Amazon DynamoDB
    MySQL
    PostgreSQL
    Spring Cloud
    Spring Security
    Spring Boot
    Kotlin
  • $35 hourly
    • 5.0/5
    • (5 jobs)
    I’m a SaaS integrations expert with a strong background in data engineering, passionate about helping businesses streamline their workflows and improve organizational efficiency. Over the years, I’ve worked on key projects connecting platforms like ClickUp, FreshService, and many others—freeing teams from repetitive tasks so they can focus on what truly matters. With 5 years of programming experience and proficiency in multiple languages, I specialize in building robust, scalable, and efficient automation solutions. My problem-solving skills, combined with a deep love for mathematics, allow me to tackle complex integration challenges and optimize business processes. If you're looking for seamless SaaS integrations that enhance productivity and eliminate bottlenecks, let’s chat!
    Featured Skill Java
    pandas
    NumPy
    Beautiful Soup
    Data Analysis
    Keras
    TensorFlow
    Machine Learning
    Selenium
    Flask
    Python
  • $200 hourly
    • 5.0/5
    • (7 jobs)
    A highly experienced software architect and solution delivery consultant having extensive experience working with complex enterprise environments since 2000, his skills cover a wide range of the technology stack, with focus on Cloud, DevOps, Real-time streaming, Systems Management, and IT Service Management. David has considerable global experience delivering solutions to many top-tier enterprise customers and his outcome-focussed attitude has been instrumental in delivery of a wide range of complex projects.
    Featured Skill Java
    Spring Boot
    Angular
    Cloud Architecture
    Kubernetes
    Apache Flink
    Apache Kafka
    ServiceNow
    Maximo Asset Management
    IBM WebSphere
    Amazon Web Services
    DevOps Engineering
    DevOps
  • $40 hourly
    • 4.5/5
    • (20 jobs)
    I am a seasoned Cloud and DevOps Engineer with over 10 years of experience in architecting, deploying, and managing robust cloud infrastructure and development operations. My career includes substantial work with leading technology firms and diverse clients. My approach is centred around providing holistic solutions that encompass every layer of cloud and DevOps practices. What I bring to your project: • Deep expertise in cloud infrastructure and DevOps: I offer comprehensive knowledge and practical experience in building and optimising cloud-based solutions, ensuring they are scalable, secure, and efficient. • Exceptional communication and responsiveness: Throughout our collaboration, you can expect top-tier communication and a steadfast commitment to meeting your project's needs and timelines. • Dedication to excellence: My primary goal is always to exceed expectations and contribute significantly to the success of your project through meticulous and forward-thinking strategies. My core specialisations include: • Cloud Technologies: Proficient in AWS, Azure, and Google Cloud Platform, with a focus on leveraging their full potential to create agile and scalable environments. • DevOps Tools and Practices: Extensive experience with automation and orchestration tools like Ansible, Terraform, and Kubernetes. Skilled in CI/CD pipeline integration, infrastructure as code (IaC), and microservices architecture. • System Architecture and Design: Expertise in designing and implementing robust, high-availability systems tailored to specific business needs.
    Featured Skill Java
    Azure DevOps
    Apache Hadoop
    SQL
    Microsoft Message Queue Server
    RabbitMQ
    DevOps
    Linux
    Bash
    Python
    Ansible
    Jenkins
    Amazon Web Services
    Docker
    Kubernetes
  • $150 hourly
    • 5.0/5
    • (1 job)
    I'm an experienced Machine Learning Engineer and have worked as a Data Engineer and Data Scientist in corporate companies, most recently building a better MLOps workflow. * Experienced python developer, comfortable working with container services (Docker, k8s) * Used to working as a consultant/contractor from previous role * Looking forward to working with you
    Featured Skill Java
    Git
    Docker
    Kubeflow
    MLOps
    Apache Spark
    Machine Learning
    Scala
    C++
    TensorFlow
    Python
  • $89 hourly
    • 5.0/5
    • (1 job)
    Senior Software Engineer with Fortune 500 experience, specialising in back-end solutions and DevOps with a focus on Observability. Expert in: Java, Python, Go, Cloud management, SLI/SLO implementation, Monitoring infrastructure (logs, metrics, traces), Software architecture and design. Offering scalable solutions, robust observability setups, and expert consultation to elevate your project's performance and reliability.
    Featured Skill Java
    SQL
    React
    System Monitoring
    Python
    Grafana
    ELK Stack
    Prometheus
    Amazon Web Services
    Google Cloud Platform
    Problem Solving
    DevOps
  • $120 hourly
    • 5.0/5
    • (19 jobs)
    I have 10+ years of experience in building user-friendly and complex mobile applications. I have a solid knowledge of modern mobile app development using Kotlin, Jetpack Compose, Clean Architecture, high standards, and the latest trends in Android technology's stack. Digging into business problems is a crucial part of my approach. I believe in architecting solutions that not only meet immediate technical needs but also align with the business goals of the organization. Important highlights of my work: • Most Mobile apps in my portfolio are built from scratch by me where I was a leading engineer. • My response time is 1 hour maximum. I am always in touch. • I know how to achieve a 99.9% crash-free rate. • I was elevating the app rating from 2.8 to 4.6 stars out of 5 in Google Play. • I am not an agency, I am doing 100% work in person. • I provide efficient work and I am able to replace a small mobile team. • My hourly rate is negotiable. Feel free to suggest your rate. My technical skills: • Programming languages: Kotlin, Java, SQL. • Tools: Kotlin coroutines, RxJava, Retrofit, Apollo GraphQL, Dagger/Hilt, Room, Android architecture components. • Frameworks: Android, Jetpack Compose, Firebase, Facebook, AdMob, Google Maps, Segment, Iterable, Apollo GraphQL. • Architecture: Multi-modular, Clean, MVP, MVI, MVVM • Environments: Android Studio, JIRA, Confluence, Youtrack, Git, Jenkins. • Methodologies: Agile, Scrum, Kanban • CI: Bitrise, Jenkins • VCS: Github, Gitlab, Bitbucket • Image loading and caching: Picasso, Glide, Coil. • Unit tests: JUnit, Mockito, Robolectric. • Other: Team leadership, Code review, Scrum master, Consultant, Mentor. Let's collaborate to bring your mobile app ideas to life and make them stand out in the competitive app market.
    Featured Skill Java
    JetPack
    Flutter
    Android App Development
    Kotlin
    Android
    Native App Development
  • $100 hourly
    • 4.9/5
    • (35 jobs)
    I specialize in Data analysis, Artificial Intelligence projects, Web development, and creating processes pipelines. I have a computer engineering background and graduated with a PhD in Machine Learning, Neural networks. Summary - Data analysis, Machine learning and Artificial intelligent skills with specialization of neural networks (Python, NumPy, Keras, TensorFlow, R, Java, Deeplearning4j); - Strong back end development experience with wide skill set (Java (Spring, Hibernate, Jackson, Microservices, Spring Security)); - Front end development experience (Javascript (AngularJS, ReactJS, ExtJS), Bootstrap); - MySQL/ SQL/Mongo, MVC, Git / Subversion toolset, Maven, Gradle; - Project management and supervisory experience (Agile, Scrum, Kanban - Jira, redmine); - Academic background; - High self-organization and discipline. My strong points are Creativeness, Punctuality and Responsiveness. The sphere of my interests is Deep Learning, Convolutional Neural Network, Recurrent Neural Network projects.
    Featured Skill Java
    Project Management
    Deep Learning
    Artificial Neural Network
    Data Science
    Artificial Intelligence
    Apache Spark
    TensorFlow
    Spring Framework
    Python
  • $90 hourly
    • 5.0/5
    • (25 jobs)
    Hi all! 100% satisfied clients on Freelance platforms! I have been building softwares for various different clients/employers for more than 10 years. I have experience with a wide range of companies, going from early-age startups, to UK top retailers, consultancies, also international top tech companies such as Amazon. I love building robust, scalable and maintanable software solving a customer problem. My career led me to work in both permanent and contract positions. I am highly business focus in my work and understand the necessary tradeoffs between delivering fast and delivering well. As a full stack engineer, I can jump in immediately and be productive on the project from the first days. My main skills include: - Architecture Design - Smooth communication processes and high availability - Robust, modular and well documented code - Easy to read and maintainable code - I will not let you down Main Languages and skills: - Backend: Java, Spring, Kotlin, Node, Microservices, AWS - Frontend: Typescript, Angular, React, React Native, Electron - CI/CD: CircleCI, Gitlab, Jenkins - Cloud: AWS (S3, IAM, Lambda, ECS, DynamoDB, Aurora) Looking forward to hearing about your projects and working with you! Cheers, Paul
    Featured Skill Java
    AWS Fargate
    AWS CloudFront
    AWS Lambda
    Automated Deployment Pipeline
    Spring Security
    CircleCI
    Amazon DynamoDB
    React
    Spring Framework
    Kotlin
    JavaScript
    TypeScript
    React Native
  • $40 hourly
    • 4.8/5
    • (19 jobs)
    I'm Managing Director of Fullstack QA Services & expertise Test & QA processes from strategy to chapters & plans Cross platform, cross browser test automation, using latest frameworks Functional testing (manual & automated) Agile development process implementation API & SOA testing (manual & automated) Continuous integration Root cause analysis & fixing Test Driven Development Code coverage analysis Application performance management & code profiling Thanks for visiting my profile.
    Featured Skill Java
    Automated Testing
    JUnit
    Apache Groovy
    Spock
    MongoDB
    Testing
    WebdriverIO
    SQL Programming
    Test Management
  • Want to browse more freelancers?
    Sign up

How hiring on Upwork works

1. Post a job

Tell us what you need. Provide as many details as possible, but don’t worry about getting it perfect.

2. Talent comes to you

Get qualified proposals within 24 hours, and meet the candidates you’re excited about. Hire as soon as you’re ready.

3. Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

4. Payment simplified

Receive invoices and make payments through Upwork. Only pay for work you authorize.

Trusted by

How do I hire a Java Developer near London, ENG on Upwork?

You can hire a Java Developer near London, ENG on Upwork in four simple steps:

  • Create a job post tailored to your Java Developer project scope. We’ll walk you through the process step by step.
  • Browse top Java Developer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top Java Developer profiles and interview.
  • Hire the right Java Developer for your project from Upwork, the world’s largest work marketplace.

At Upwork, we believe talent staffing should be easy.

How much does it cost to hire a Java Developer?

Rates charged by Java Developers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.

Why hire a Java Developer near London, ENG on Upwork?

As the world’s work marketplace, we connect highly-skilled freelance Java Developers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream Java Developer team you need to succeed.

Can I hire a Java Developer near London, ENG within 24 hours on Upwork?

Depending on availability and the quality of your job post, it’s entirely possible to sign up for Upwork and receive Java Developer proposals within 24 hours of posting a job description.

Looking to hire for long-term or full-time assignments? See how Full-time hiring on Upwork simplifies the process.