Hire the best JavaScript Developers in Leiden, NL

Check out JavaScript Developers in Leiden, NL with the skills you need for your next job.
Clients rate JavaScript developers
Rating is 4.8 out of 5.
4.8/5
based on 246 client reviews
  • $80 hourly
    Extensive experience in business planning, problem-solving and formulating novel solutions to business problems. Leverages technical knowledge to efficiently deliver successful outcomes. Particular affinity with the highly-competitive aviation industry.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Network Analysis
    Presentations
    Network Planning
    Data Analysis
    Market Analysis
    Data Modeling
    Aviation
    Microsoft Excel
    Google Apps Script
    Revenue Management
    HTML
    Business Analysis
  • $72 hourly
    I am a highly motivated freelancer with a strong affinity for development and a passion for problem-solving. My analytical skills and eagerness to learn allow me to quickly adapt to new situations, making me a valuable asset to any project. I have extensive experience in web development, with a variety of projects under my belt. I have developed a CRM using Laravel as the backend and have created multiple WordPress websites for clients. Currently, I am studying computer forensics and have successfully completed complex projects related to OSINT and computer forensics. I am dedicated to delivering high-quality work and exceeding client expectations. Let's work together to bring your project to the next level.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    SCSS
    Front-End Development
    Git
    HTML5
    CSS 3
    PHP
    Laravel
    UI/UX Prototyping
    Digital Forensics
    API
    Linux
    Machine Learning
    Python
    Computer Vision
  • $130 hourly
    Use the right processes and technologies to build your software applications efficiently. As CTO and technology consultant, I help my clients select the most suitable processes, technologies and platforms for their software projects. I guide your team to work in this environment to build your product and ensure the highest possible quality throughout the product lifecycle. In my role as product manager, I ensure your projects make progress efficiently by: - Gather and specify requirements for your business case - Create a product roadmap, including timeline and budget - Recommend the technologies and frameworks most suitable for your project - Evaluate contractor or team member candidates and make hiring recommendations - Establish a suitable workflow for your project to ensure progress is on track - Maintain the product backlog throughout development as requirements or priorities may change - Communicate your needs to the technical team via clear, actionable technical specifications - Help the technical team find solutions for challenging technical problems - Create a testing strategy (manual and automated) to ensure high quality deliverables I have 15 years of work experience as CTO and team lead for full-stack web applications, from the server to the browser or mobile frontend. I have led and coached teams in diverse countries including the US, Germany, Austria, Bulgaria, China, Singapore, the Philippines, India, and Pakistan. In addition to my practical experience, I have a strong theoretical background as Certified Scrum Product Owner, Certified Tester and Master's degree in Computer Science. As a consultant, I have worked as an agile product manager on-site with clients in Singapore as well as remotely with clients in the US and Europe. My client and I have won the Austrian Constantinus IT award for quality and innovation in one of our projects.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Product Management
    Scrum
    Java
    J2EE
    Project Management
    Agile Software Development
    Software Testing
    Test-Driven Development
    Automated Testing
  • $72 hourly
    As a highly skilled software engineer based in the vibrant city of Leiden, just a short distance from Amsterdam, I am dedicated to solving complex computer science problems and developing innovative software solutions. With a strong background in a variety of programming languages, including C, C++, Python, and JavaScript/TypeScript (Node.js), I have the technical expertise to tackle a wide range of software development projects. This includes creating new software from scratch, extending or modifying existing software, and developing small scripts to execute specific programs. In addition to my programming skills, I have a keen understanding of algorithms and their time complexities. I am skilled at designing and modifying algorithms to meet the specific needs of a project. Working with databases is also a strength of mine, including designing relational databases and building queries using SQL and R, as well as extracting data from various sources such as databases, APIs, and websites. Implementing continuous integration and continuous delivery (CI/CD) processes can greatly improve the efficiency and reliability of a software project, and I have experience doing so. I am also proficient at designing and developing APIs using tools like OpenAPI/Swagger and have experience connecting to or implementing existing APIs in various projects. I have a strong background in containerization technologies like Docker, including creating and pushing Docker images and setting up Docker Compose configurations. In addition to my back-end development skills, I am also experienced in web development using Node.js. Proficiency in LaTeX is another one of my skills, and I am happy to assist with formatting and creating professional documents or notation. I am also available for consultation on any of the subjects mentioned above and am eager to collaborate with you on your project to bring your software ideas to life.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Database
    Python
    PHP
    Node.js
    API
    C
    Software Architecture & Design
    TypeScript
    Statistics
    CI/CD
    Web Development
    Relational Database
    Git
    SQL
    C++
    Data Science
  • $30 hourly
    After having worked in software development since 2020, I am now restarting my studeies and am a masters student in mathematics at Leiden University.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Web Development
    GraphQL
    SQL
    React Native
    React
    Problem Solving
    Mathematics Tutoring
    Mathematics
    TypeScript
    Software Development
    C++
    .NET Framework
    C#
    Python
  • $20 hourly
    I'm a software development professional with 7+ years of experience in developing and designing web applications using HTML, CSS, JavaScript, Angular, Node.js, React, and Vue.js. Adept at developing and deploying complex backend systems, web services, and databases. Have a good experience in team and remote work.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Vue.js
    Angular
    CSS
    HTML
    MySQL
    Django
    PHP
    Python
    ExpressJS
    MongoDB
    Node.js
    React
  • $25 hourly
    🤣I take great satisfaction in delivering exceptional results to my Upwork clients and seeing the joy on their faces as their project is completed. 🤣 💪As a skilled and experienced frontend Engineer, UI/UX designer, web developer, and computer programmer with over a decade of experience, I take great pride in delivering exceptional results to my clients. 💪 My advanced skills in both frontend and backend technologies, combined with my keen eye for current design trends, ensures that each project is unique and of the highest quality. But what truly sets me apart is my unwavering commitment to client satisfaction. I strive to not only meet but exceed expectations and nothing brings me greater joy than seeing the smile on my client's face upon project completion. 🔥🔥🔥🔥🔥Let's work together to bring your vision to life. 🔥🔥🔥🔥🔥 My areas of expertise ▬▬▬▬▬▬▬▬▬▬▬ ✔️ HTML5, CSS3, JavaScript, jQuery, SCSS & LESS. ✔️ React.js, Vue.js, Node.js, Express.js, Typescript, D3.js, Webflow, Bubble.io ✔️ Bootstrap, Zurb Foundation, Semantic UI. ✔️ Webpack, Gulp, Firebase, Git & SVN. ✔️ PHP, MySQL, MariaDB, MongoDB, & PostgreSQL ✔️ Magento, Shopify, Wordpress, wooCommerce, Laravel ✔️ Photoshop, Illustrator, Adobe XD, Sketch, inVision, Figma & Zeplin. Why Choose Me for Your Next Project? ▬▬▬▬▬▬▬▬▬▬▬ As a highly educated professional with a Bachelor's and Master's degree in Computer Science, I possess a deep understanding of both coding and design. I am confident that I can bring your ideas to life with my expertise and passion for new challenges. I pride myself on my ability to deliver high-quality, efficient solutions to my clients. My strong attention to detail, excellent communication skills, and dedication to meeting your needs ensure that your project will be completed to your exact specifications. Don't hesitate to reach out to me to discuss your project in more detail. Together, we can create something truly special. I am confident in my ability to positively contribute to your project and exceed your expectations.
    vsuc_fltilesrefresh_TrophyIcon JavaScript
    Figma
    Tailwind CSS
    WordPress
    Bootstrap
    HTML5
    Webflow
    jQuery
    Vue.js
    React
    Template Design
    Web Design
    Bubble.io
    Front-End Development
    CSS
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