Hire the best Java Developers in Koeln, DE

Check out Java Developers in Koeln, DE with the skills you need for your next job.
Clients rate Java developers
Rating is 4.8 out of 5.
4.8/5
based on 163 client reviews
  • $50 hourly
    I’m a versatile Software Engineer with expertise in backend and frontend development, API design, cloud technologies, and cross-platform applications. I develop scalable, high-performance solutions that power modern businesses. 🔹 Backend & API Development: Java (Spring Boot), C# (.NET), Node.js, Python 🔹 Cloud & DevOps: AWS (Lambda, EC2, RDS, DynamoDB), CI/CD, Docker, Kubernetes 🔹 Database & Data Processing: PostgreSQL, MySQL, MongoDB, Redis, Oracle PL/SQL 🔹 Cross-Platform & Mobile Apps: Flutter, Firebase, Native integrations, Swift 🔹 Software Architecture & Optimization: Scalable, secure, and maintainable solutions Why work with me? ✅ End-to-End Development: From architecture to deployment, I cover the entire lifecycle. ✅ Scalable & Secure Solutions: Optimized for performance, reliability, and maintainability. ✅ Problem-Solver: I don’t just write code—I create efficient solutions tailored to business needs. Let’s bring your project to the next level! 🚀 Feel free to reach out to discuss your requirements.
    vsuc_fltilesrefresh_TrophyIcon Java
    Dart
    Full-Stack Development
    API Development
    Spring Boot
    REST API
    Mobile App Development
    FlutterFlow
    Flutter Stack
    Visual Basic for Applications
    Flutter
    AWS Development
    SQL
    Python
  • $35 hourly
    A java developer with 10 years of experience. worked with java, angular, hibernate and elastic search integration
    vsuc_fltilesrefresh_TrophyIcon Java
    Microsoft SQL Server
    Hibernate
    Elasticsearch
    Angular
  • $40 hourly
    I’m a passionate and detail-oriented DevOps Engineer with 6+ years of experience working in leading IT companies. Specializing in Kubernetes, I’ve successfully implemented and managed Kubernetes environments across a variety of setups, including on-premises, private cloud (OpenStack-based), and VMware platforms. With a Master’s degree in Electrical Engineering and Computing, I bring a strong technical foundation, combined with a collaborative approach gained from working in diverse, multicultural teams across two countries. I’m well-versed in delivering tailored technical solutions, leading workshops, and working closely with clients to meet their unique needs. Let’s work together to bring your projects to life with seamless DevOps solutions!
    vsuc_fltilesrefresh_TrophyIcon Java
    Computing & Networking
    OpenStack
    VMWare
    Python
    YAML
    Bash Programming
    Grafana
    Prometheus
    CI/CD
    Docker
    Linux System Administration
    Kubernetes
    Communication Skills
    Problem Solving
  • $70 hourly
    I am a passionate software developer with multiple years of professional experience and an insatiable curiosity for technology and design. My enthusiasm for programming started early and developed into an expertise in Java and the Spring Framework. With the drive to constantly learn new things, I have acquired a broad knowledge of various technologies. My work is characterized by attention to detail and high quality standards. I firmly believe that excellent design and clean code architecture are the basis for successful software projects. Thanks to my experience in software design, methodology and CI/CD tools, I am able to design seamless and efficient development and deployment processes. I bring not only my technical knowledge to projects, but also my creative energy and ability to solve complex problems. I am always looking for new challenges to further develop my skills and create innovative solutions that offer real added value.
    vsuc_fltilesrefresh_TrophyIcon Java
    Software Architecture
    Spring Boot
    Web Development
    Script
    Web Application
  • $20 hourly
    Hi my name is Leon! I'm a developer that is specializing in c/cpp right now aswell as embedded systems (stm32)
    vsuc_fltilesrefresh_TrophyIcon Java
    Spring Boot
    Front-End Development
    Back-End Development
    Natural Language Processing
    TensorFlow
    Python
    Raspberry Pi
    Windows App Development
    C
    C++
    Git
    Linux
    macOS
    Linux System Administration
  • $42 hourly
    Experienced IT professional specializing in full-stack development and system administration. Skilled in backend and frontend development, database management, and automation. Strong background in media informatics and problem-solving, with a focus on delivering efficient, practical solutions.
    vsuc_fltilesrefresh_TrophyIcon Java
    Scripts & Utilities
    Web Development
    Web Application
    Software Development
    Python
    SQL
    Vue.js
    PHP
    JavaScript
  • $5 hourly
    Hi, I'm Nikita. I'm living in Germany and working as frontend developer. My skills: JavaScript React TypeScript HTML5 CSS ·
    vsuc_fltilesrefresh_TrophyIcon Java
    Neos Flow
    ExpressJS
    Node.js
    PHP
    MongoDB
    MariaDB
    Angular
    CSS 3
    HTML5
    TypeScript
    React
    JavaScript
  • $22 hourly
    A specialized full stack developer adept in working with both frontend and backend development and with capacities to deal with multiple programming languages. Graduated from the National Technological University, the USA, not only I am equipped with a promising skill-set but also have over a decade of experience in building professional solutions, experience in structuring, developing and implementing interactive web products. Throughout my working carreer and a long-standing background I have gained an immense experience of working with HTML5 by using markup, with CSS3, CSS and C++. I have in-depth knowledge of Java, JavaScript frameworks, as well as PHP, Python and Perl, WIX, Wordpress, Shopify, let alone the fact that I have a huge experience in working with both Ruby and Database storage (SQL, MySQL, MongoDB). As a full steck developer I am also skilled in working with MEAN such as: MongoDB(for the Database),Express.js(for the Web framework), AngularJS(for the frontend framework), NodeJs(for the server platform). I also have a creative vision and design skills: UI/UX, Illustration, Adobe Photoshop, Figma, InVision Studio, Sketch and SVG Animation. So, I will accept useful and diverting cooperations and do my best.
    vsuc_fltilesrefresh_TrophyIcon Java
    Node.js
    React
    Python
    Angular
    Next.js
    JavaScript
    PHP
    HTML
  • $12 hourly
    Hi, I’m Giovanni, a dedicated professional passionate about customer service and office efficiency. With solid experience in customer support, effective communication, and problem-solving, I excel at understanding people's needs and providing solutions with empathy and precision. I have advanced skills in the Office suite (Word, Excel, PowerPoint, etc.) and knowledge of agile methodologies like Scrum. Additionally, my background in programming (HTML, CSS, JavaScript, SQL, Node.js, and Vue) allows me to understand technical processes and optimize digital workflows. I speak four languages: Spanish (native), English (C1), Portuguese (B2), and German (A1, continuously improving), which enables me to interact with clients from various parts of the world. Currently, I live in Germany, where I’ve learned to adapt to new environments and cultures, strengthening my communication skills and ability to integrate into international teams. If you’re looking for a proactive, solution-oriented professional with an open mindset, I’d love to work with you. Let’s connect! 🚀
    vsuc_fltilesrefresh_TrophyIcon Java
    JavaScript
    SQL
    Vue.js
    CSS
    HTML
    Node.js
  • $10 hourly
    I'm a teacher for german, history, geography and computer science since 2020. For a career change, I want to get into software developing. - Java entry level - communication is the key
    vsuc_fltilesrefresh_TrophyIcon Java
    Proofreading
    Geography
    History
    Language Studies
  • $30 hourly
    Hello! I'm a versatile software engineer and web developer with a proven track record of delivering high-quality solutions across diverse industries. My expertise spans web development, software engineering, and Linux systems administration. Here's what I bring to the table: Web Design & Development I specialize in designing and developing user-friendly, responsive websites tailored to your specific needs. Software Engineering Expertise Currently working at Deutsche Luft und Raumfahrt, I manage GitLab, pipelines, and package creation, ensuring smooth software development workflows. I am also proficient in Git, GitHub, and CI/CD processes, enabling efficient version control and automated deployment pipelines. Additionally, I have experience setting up and maintaining test environments, including utilizing frameworks like unittest to ensure code quality and reliability. Scientific Computing With a degree in physics, I specialize in implementing well-known algorithms for specific problems and applying them efficiently where needed. I can assist with smaller tasks from academic courses or develop simulations that are carefully designed to stay within the performance limits of a standard personal computer, as I do not have access to supercomputers.. Application Development I build robust applications using Python, Java, and Swift (Xcode). From desktop to mobile, I can create reliable and scalable solutions for all operating systems. When needed, I also write Linux kernel modules in a limited scope to optimize processes and enhance efficiency based on the specific requirements of a given situation. Linux Administration With years of experience managing Linux systems, I handle everything from system configuration to server optimization, with a primary focus on Debian-based distributions. If you're looking for a detail-oriented and reliable professional to bring your project to life, let's connect! I'm excited to help you achieve your goals, and I always look forward to learning about new use cases and challenges brought to me by my clients.
    vsuc_fltilesrefresh_TrophyIcon Java
    Julia
    Computational Fluid Dynamics
    Physical Science
    Docker
    C
    Embedded Linux
    Bash Programming
    Linux
    GitHub
    GitLab
    Python
    DevOps
  • $11 hourly
    I'm a Junior Developer collecting experience. This is my main aim. Small projects to create a resume are desired.
    vsuc_fltilesrefresh_TrophyIcon Java
    MySQL
    CSS
    HTML
  • 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 Koeln, on Upwork?

You can hire a Java Developer near Koeln, 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 Koeln, 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 Koeln, 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.