Hire the Best Core Java Developers

I specialize in development in Java, Dart (Flutter) and other C-like languages, bringing over a year of hands-on experience in software engineering. My background includes successfully debugging and building modules for business management applications. I have a strong foundation in object-oriented programming, software architecture, and various industry-standard technologies. Notable projects include the independent development of a C++ 2D game engine and a Raspberry Pi-based language model voice assistant. I excel at crafting practical solutions that enhance user experience and thrive on tackling complex challenges. If you're looking for a developer who can deliver innovative and efficient applications, let’s connect. I am eager to contribute to your project and help you achieve your goals.

Hello! I'm Swastik Srivastava, a Full Stack Developer and Big Data Consultant with over 5 years of experience delivering scalable, high-performance solutions for startups, enterprises, and global clients. I specialize in building robust systems across the Java ecosystem, Big Data architectures, and data-driven marketing platforms. My work spans across multiple domains including Scala + Spark development, data analytics, digital marketing tech stacks, and end-to-end web applications. 🔧 Core Skills & Expertise: Backend: Java (Spring Boot), Scala, Kafka, REST APIs Big Data: Spark, Hadoop, Hive, Flink, Sqoop, Airflow Cloud: AWS (S3, Lambda, Glue), GCP, Azure (Data Factory, Synapse) Frontend: JavaScript, React, HTML/CSS Databases: MySQL, MongoDB, PostgreSQL DevOps: Docker, GitHub Actions, Jenkins, CI/CD Pipelines Digital Marketing Tech: Google Analytics, Meta Ads Reporting, Marketing Funnels, Email Automation Data Analytics: ETL Pipelines, Dashboards, SQL, Python (Pandas), Power BI ✅ Why Work With Me? Proven track record with top-tier clients (e.g., Morgan Stanley via EY) Ability to lead full-stack projects while coordinating with cross-functional teams Clear communicator who ensures on-time, high-quality delivery You work directly with me — I handle communication and project management, while my internal team supports execution for faster turnaround and flexibility 📈 Services Offered: ✅ Java + Spring Boot Microservices Development ✅ Big Data Pipeline Design with Spark, Scala, Kafka ✅ Digital Marketing Data Analysis & Automation ✅ Web Development & Full-Stack Application Builds ✅ Data Analytics Dashboards & Reporting When I'm not coding, I mentor junior developers and love solving challenging backend and data problems. I'm passionate about helping businesses unlock the full value of their data and digital infrastructure. 📩 Let’s connect! Whether you need a quick fix or a long-term technology partner, I’m always open to a conversation to understand how I can help.

🚀 Experienced Software Engineer | Java, Spring & Kotlin Specialist | Oracle-Certified | 10+ Years in Web & API Development Hi, I'm Daniel — a passionate software engineer with over a decade of hands-on experience in designing, developing, and delivering robust solutions using Java, Kotlin, Spring Boot, and RESTful APIs. I’m also Oracle-certified and have contributed to a wide range of successful projects across industries, from startups to large enterprises. 💻 Tech Stack Highlights Java, Kotlin, Spring Framework (Boot, MVC, Security) Angular & React for modern web interfaces AWS for cloud infrastructure JasperReports for reporting solutions PostgreSQL, MySQL, and other RDBMS AI Agents (Augment, Cortex) 🌐 My background includes full-stack development (Desktop and Web), integration with cloud services, and leading feature development in agile environments. Whether it's building scalable microservices, modern APIs, or intuitive UIs, I bring technical depth and adaptability to every project. ✅ Open to remote opportunities ✅ Fluent in English and Portuguese ✅ Strong communication and teamwork

Looking for an experienced Java Developer to join your team? 💪Strong Java Fundamentals. Extensive Experience. Code Quality 🧠Continuous Learning. Adaptability and Resilience 🥇Leadership and Mentorship. Team Player. Communication Skills I, Farhan, here to provide your team the support below 👇 ✅𝘿𝙀𝙎𝙄𝙂𝙉 𝘼𝙉𝘿 𝘼𝙍𝘾𝙃𝙃𝙄𝙏𝙀𝘾𝙏𝙐𝙍𝙀 Let me collaborate with architects and other team members to define system requirements, design scalable and maintainable architectures, and choose appropriate technologies and frameworks. ✅𝘿𝙀𝙑𝙀𝙇𝙊𝙋𝙈𝙀𝙉𝙏 I can implement robust, high-quality, efficient, and maintainable code following best practices and coding standards. ✅𝘾𝙊𝘿𝙀 𝙍𝙀𝙑𝙄𝙀𝙒 𝘼𝙉𝘿 𝙌𝙐𝘼𝙇𝙄𝙏𝙔 𝘼𝙎𝙎𝙐𝙍𝘼𝙉𝘾𝙀 I can help identify and address issues such as code smells, performance bottlenecks, and security vulnerabilities. ✅𝙏𝙀𝘾𝙃𝙉𝙄𝘾𝘼𝙇 𝙇𝙀𝘼𝘿𝙀𝙍𝙎𝙃𝙄𝙋 I can mentor and coach junior developers, share their knowledge and expertise, and promote best practices and coding standards. ✅𝘿𝙊𝘾𝙐𝙈𝙀𝙉𝙏𝘼𝙏𝙄𝙊𝙉 𝘼𝙉𝘿 𝙆𝙉𝙊𝙒𝙇𝙀𝘿𝙂𝙀 𝙎𝙃𝘼𝙍𝙄𝙉𝙂 I can document technical designs, implementation details, and best practices to ensure knowledge transfer within their teams. If you're ready to collaborate with me and build awesome software, please send me an 𝙞𝙣𝙫𝙞𝙩𝙚 or 𝙤𝙛𝙛𝙚𝙧 on Upwork. We can chat or setup a Discovery Call 📞

Build Scalable Enterprise Systems with a CTO Mindset | Java Spring Boot & Full-Stack Expert High-quality code is not an expense—it’s an investment. I don’t just write endpoints; I architect systems that scale with your business. With a deep focus on the Java ecosystem and modern web technologies, I help startups and established companies turn complex requirements into robust, production-ready solutions. Whether you are building an MVP or scaling a microservices-based platform, I ensure your backend is secure, fast, and maintainable. What I Bring to Your Project: ✅ Strategic Architecture: Designing scalable systems using Spring Boot, focusing on Clean Architecture and SOLID principles. ✅ Security First: Implementing industry-standard security with Spring Security and JWT to protect your data. ✅ Performance & Optimization: Leveraging PostgreSQL, Redis, and optimized query logic for high-load applications. ✅ Seamless Integration: Connecting your system with third-party APIs, payment gateways (like PayZo), and automated services. ✅ Mentorship & Leadership: As a CTO at heart, I ensure the development process follows best practices, making the code easy to handover or scale. Core Tech Stack: ● Backend: Java, Spring Boot (Web, Security, Data JPA, Cloud), NestJS, Rust. ● Frontend: React.js, TypeScript, Tailwind CSS. ● Mobile & Desktop: Tauri. ● Infrastructure: Docker, PostgreSQL, Redis, RESTful API Design. Recent Success: Successfully delivered a high-performance Bookstore Management system with complete API documentation (Swagger/Postman) and 100% client satisfaction on Upwork. If you’re looking for a developer who understands business goals as well as they understand code — let's have a chat and build something great together.

Full-Stack Developer | Tech Enthusiast | Tech Innovator | Contractor Java • React • React Native • Flutter • Next.js • Laravel • jQuery • MySQL • MVP Builder Hi, I’m a Java Developer with extensive experience in software development, specializing in backend, and full-stack solutions. I build high-performance, scalable applications using Java, Spring Boot, and modern web technologies. My expertise covers RESTful API design, microservices architecture, and cloud-based solutions with Amazon Web Services (AWS) and Docker. ✔ Core Skills & Technologies: I leverage a versatile tech stack to build scalable, secure, and high-performance applications, ensuring reliability and efficiency. 🟢 Programming Languages: Java, JavaScript, TypeScript, PHP – Used to develop enterprise applications, handling thousands of daily users. 🟢 Frameworks & Libraries: Java Spring Boot, Spring Framework, Hibernate, React, Next.js, jQuery – Optimized system performance, improving response times by 25%. 🟢 Database Management: MySQL, SQL, MongoDB – Designed and maintained databases processing over 10K+ transactions monthly. 🟢 Web & Application Development: Web Development, Java Development, Desktop Applications, Standalone Applications, enhancing client operations and user engagement. 🟢 DevOps & Deployment: Docker, Apache Tomcat, Git – Streamlined CI/CD pipelines, reducing deployment time by 30%. 🟢 Software Engineering: Software Architecture & Design, Software Development, Software Debugging – As a Java Developer I developed scalable solutions supporting 50K+ active users. 🟢 UI/UX: HTML CSS JavaScript, HTML5, CSS3 – Created responsive interfaces that increased user engagement by 20%. 🟢 Testing & Quality Assurance: JUnit, Software Testing – Reduced production issues by 40% through automated and manual testing. 🔧 My Toolkit Frontend: React, Next.js (App + Pages Router), TailwindCSS, shadcn/ui, JSP Backend: Java, PHP, PostgreSQL, MongoDB, MySQL DevOps: Vercel, AWS (Lambda, S3, EC2), Azure, Docker, GitHub Actions ✅ Why Clients Work With Me 🟢 Problem-Solving Mindset: Writing clean, maintainable, and well-documented code for scalability 🟢 Client-Centric Approach: Aligning technology solutions with business goals 🟢 Agile Software Development: Iterative development, CI/CD pipelines, continuous integration 🟢 Performance & Security Focused: Optimized queries, security best practices If you're looking for an experienced Java Developer, Senior Java Developer, Full Stack Developer, Java Spring developer, Javascript Developer, PHP Developer, Java developer India to build scalable, high-performance applications, let’s connect!🚀 Last updated: 23.12.2025