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I'm an experienced Java developer, in the business for 15 years now. I worked for Start-ups, mid size companies and enterprises over the areas of telecommunication 📱, FinTech 📈, retail, eMobility, logistics🚚, renewable energies and defense. 🔧Often I also do the DevOps task: "You build it, you run it" 🐧Linux is my preferred OS for 25 years now, using it as desktop, on servers or for embedded devices. My main/favorite topics are: ⭐ Test driven development ⭐ Code quality ⭐ Dependency upgrades ⭐ Java version upgrades ⭐ Dependency security audits ⭐ Clean Code ⭐ Code Reviews ⭐ Build automation ⭐ System tests Key Technologies: ✅ Java 8-21 ✅ Spring Boot 2+3 ✅ JPA ✅ PostgreSQL ✅ MongoDB ✅ Kafka ✅ RabbitMQ ✅ Karaf OSGi ✅ Maven/Gradle ✅ Junit 5 ✅ Mockito ✅ AssertJ ✅ Jenkins ✅ GitHub Actions ✅ GitLab CI ✅ SonarQube ✅ Docker ✅ Kubernetes ✅ Cloud

Hi I'm Sebastian, an Excel/Access VBA Developer with over 7 years of experience and former Dispatcher with a robust background in IT and logistics. I deliver custom solutions for various Excel / Access scenarios to enhance your business to the next level. My core strengths: • Interactive User Forms for Automation and Data Entry • Automation of Manual Tasks and Processes • Customized Automated Dashboard • Creating / Correcting Simple / Complex Formulas • Enhancing / Arranging Data with Filters and Conditional Formatting • Removing Duplicates • Visual upgrades like Charts, Graphs, Pivots, Dropdowns etc. • Power Queries • PDF to MS Excel and Vice-Versa I am just getting started on Upwork so I will do the first few projects for much less. Message me for a free consulting

𝐖𝐡𝐲 𝐋𝐞𝐚𝐝𝐢𝐧𝐠 𝐂𝐨𝐦𝐩𝐚𝐧𝐢𝐞𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞 𝐟𝐨𝐫 𝐓𝐡𝐞𝐢𝐫 𝟏 𝟎𝟎𝟎,𝟎𝟎𝟎 $ 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 With 12+ years mastering backend systems, cloud architecture, and API integrations, I've helped companies like Macy's, Canadian Tire, and HPE transform their technical vision into reality. Now it's your turn. Let’s kick things off with something valuable: 💥𝐅𝐑𝐄𝐄 𝐏𝐫𝐨𝐭𝐨𝐭𝐲𝐩𝐢𝐧𝐠 𝐏𝐚𝐜𝐤𝐚𝐠𝐞💥. I’ll create your first prototype 𝐚𝐭 𝐧𝐨 𝐜𝐨𝐬𝐭 to get your idea moving. Just text me! ⚙️ 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐈 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐝𝐚𝐢𝐥𝐲: - 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬: TypeScript, JavaScript, Node.js, Java, React, NextJS, NestJS, Spring Boot, Angular.js, Vue.js - 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch - 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: AWS (EKS, S3, RDS, Lambda, SQS), Docker, Kubernetes, Terraform, GitLab CI/CD, Linux - 𝐀𝐏𝐈 & 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: REST, SOAP, GraphQL, OpenAPI/Swagger, Stripe, Airwallex, Routfusion, Fortress, Express, Firebase, Webhooks, JSON - 𝐒𝐭𝐲𝐥𝐞 & 𝐃𝐞𝐬𝐢𝐠𝐧: HTML5, CSS3, Bootstrap, SASS, LESS, NPM, Gulp, AJAX, Webpack - 𝐓𝐞𝐬𝐭𝐢𝐧𝐠 & 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐏𝐫𝐚𝐜𝐭𝐢𝐜𝐞𝐬: Unit Testing (Jest, JUnit), Agile/Scrum, Git, GitFlow, Responsive Design, Mobile-First 📣 What Clients Say About Me and my team: ⭐⭐⭐⭐⭐ "Sednor Holdings Limited delivered high-quality development work on our AWS-hosted web application. Their technical expertise in both Java and React scaled the project from scratch. We’ve invested over $500,000, and I’d gladly work with them again." – 𝐂𝐡𝐞𝐭𝐭 𝐑𝐮𝐛𝐞𝐧𝐬𝐭𝐞𝐢𝐧, VP Principal Architect at Hewlett Packard Don't wait - your success story starts now. Click here and let's get started.🚀

As an Expert Engineer with over 8 years of experience, I specialize in Java and Kotlin development within the Spring and Spring Boot frameworks. Here's a breakdown of my skills: * Java + Kotlin software development: 4+ years * Spring framework: 5+ years * Cloud solution architecture with Spring: 2.5+ years * Diverse database expertise: SQL (e.g., PostgreSQL) and NoSQL (e.g., MongoDB, Elasticsearch, Dgraph) * Proficiency in messaging systems: Kafka, RabbitMQ * Strong integration skills with tools like Prometheus, Grafana, Jenkins, and Docker * Non-production development experience in C/C++: 4+ years, C# development: 1+ year * Fast learner with a passion for exploring innovative technologies * Architectural design tailored to project requirements * Analytical skills for solution evaluation and enhancement. With a proven track record of delivering high-quality software solutions, I thrive in dynamic environments where innovation and continuous improvement are encouraged.

I’m a Computer Science Engineer based in Germany. If your project involves massive data streams, messy SSO integrations, or high-throughput Java systems, I’m the person you hire to get it done without the excuses. I don't just "write code"—I handle the infrastructure and architecture that most developers try to avoid. I've spent the last few years building systems that actually scale, from real-time data pipelines to enterprise-grade security layers. Whether it’s architecting a Kafka cluster or setting up a complex SAML flow for an entire organization, I take full ownership of the project so you can stop worrying about it. Big Data & Streaming: I build and optimize data pipelines using Kafka, Spark, Hadoop, and Cassandra. If you have data bottlenecks, I’ll find them and kill them. Security & IAM: I specialize in SSO solutions (SAML, Shibboleth, SimpleSAMLphp). I can set up a secure, seamless auth flow for your whole company using Groovy for custom logic. Observability: Full-scale ELK Stack implementation. I make sure you can actually see what's happening inside your systems. Core Engineering: Deep experience in Java (Spring, JavaFX, Swing) and NoSQL (MongoDB). I build software that stays up when the traffic hits. The Full-Stack Backup I can build clean, functional web apps using PHP (Laravel), Angular, and Tailwind. I’m based in Germany, work on European time, and I don't miss deadlines. I'm looking forward to hearing from you and working with you. Cheers

I am a Senior Software Engineer with 10+ years of experience. I have solutions for different applications and the best tools ever to execute any given task. I believe in myself and have a positive attitude. I am a very quick learner who has a good understanding of fundamentals / foundation concepts.Able to pick up newer frameworks / technologies by incremental learning.I have skills in building Java-based web-applications using but not limited to the following technologies: - AWS - SAP Hybris - Core Java - JavaEE (Servlet, JSP, JSTL, JDBC, JPA) - Spring Framework (Spring MVC, Spring Security, Boot) - Hibernate - JavaScript (Ajax, jQuery, AngularJS) - REST, SOAP - JUnit, Integration tests - Maven, Ant - Git, SVN, CVS - Android APP Development - Google API - Flutter I also have had a good fortune to work on Android APP Development and Google api in which I have a great desire to extend my skills and knowledge to any project that is related to the same. In addition, Leadership: At most two years of development team (from 3 to 6 person) leadership and technical account management. Problem-solving: Ability to recognize and define problems, invents and implements solutions, track and evaluates results. Creative thinking: New approaches to problem-solving, organizational design, and product development all spring from the individual capacity for creative thinking.