DANIEL

MERN Stack Developer | Full-Stack JavaScript Web Application Development

Devox Software • Freiberufler

Apr 2023 - Dec 2025 • 2 yrs 8 mos

s a passionate and results-driven MERN Stack Developer, I specialized in building high-performance, scalable, and responsive web applications using MongoDB, Express.js, React.js, and Node.js. I worked closely with clients to transform ideas into fully functional digital products that delivered real business value. I developed modern full-stack applications with clean code architecture, seamless API integrations, optimized database structures, and responsive user interfaces. I focused on creating fast, secure, SEO-friendly, and mobile-responsive websites that improved user experience and boosted engagement. What I Did: I built custom full-stack web applications using the MERN Stack I developed responsive React.js frontends with modern UI/UX design I created secure RESTful APIs using Node.js and Express.js I designed and managed MongoDB databases for scalable applications I integrated third-party APIs, payment gateways, authentication systems, and cloud services I optimized website speed, performance, and SEO for better rankings I fixed bugs, improved application performance, and maintained existing codebases I collaborated with clients to understand project goals and deliver tailored solutions I deployed applications on cloud platforms and ensured smooth production performance Skills & Technologies: MERN Stack, MongoDB, Express.js, React.js, Node.js, JavaScript, TypeScript, Next.js, Redux, REST API Development, Firebase, Tailwind CSS, Bootstrap, HTML5, CSS3, Responsive Web Design, Web Application Development, Frontend Development, Backend Development, Full-Stack Development, API Integration, Authentication, JWT, Git, GitHub, Cloud Deployment, SEO Optimization, Website Performance Optimization. Why Clients Loved Working With Me: I combined strong technical expertise with clear communication, attention to detail, and a commitment to delivering quality work on time. I always focused on building reliable, friendly, and scalable solutions that helped business grow.

Full Stack Developer | Software Engineer | React.js, Angular, Node.js & Java Developer

Software Keys Hub • Freiberufler

Feb 2021 - May 2023 • 2 yrs 3 mos

I worked as a Full Stack Developer / Software Engineer, specializing in Full Stack Web Development, Custom Web Application Development, and Mobile Application Development for startups, businesses, and enterprise clients. I designed, developed, tested, and deployed scalable web applications and cross-platform mobile applications using modern technologies including React.js, Angular, Node.js, Express.js, Java, JavaScript, and TypeScript. I built high-performance and responsive frontend systems as a Frontend Developer using React Developer and Angular Developer best practices, creating modern UI/UX interfaces with HTML5, CSS3, and responsive web design techniques. I focused on delivering fast-loading, SEO-optimized, user-friendly applications with clean and reusable code. As a Backend Developer, I developed secure and scalable backend architectures using Node.js Development, Java Development, and REST API Development. I built custom APIs, authentication systems, payment gateway integrations, and business logic solutions while managing databases such as MongoDB, MySQL, and PostgreSQL for optimized application performance and data management. I also worked on complete MERN Stack Development projects, cloud deployment, software architecture, and application maintenance. I collaborated with designers, developers, and product teams using Agile Development, GitHub workflows, and software engineering best practices to deliver high-quality SaaS applications, enterprise software solutions, and scalable digital products. Responsibilities & Expertise: I designed and developed scalable Full Stack Web Applications and Mobile Applications. I built responsive and SEO-friendly frontend interfaces using React.js, Angular, JavaScript, TypeScript, HTML5, and CSS3. I developed secure backend systems using Node.js, Express.js, and Java. I created and integrated REST APIs, third-party APIs, and payment gateway systems. I optimized website speed, application scalability.