Greetings! I'm Gutu Daniel Geleta, a Full Stack Developer with deep expertise in Java-based backend systems and scalable web applications. With experience across fintech, edtech, and e-commerce, I bring a problem-solving mindset and real-world experience in delivering secure, high-performance, and microservice-oriented architectures. I currently serve as a Software Engineer at Dengene Technology Solution (USA-based), where I work with Java, Spring Boot, and Kafka to build robust microservices and event-driven systems in fast-paced environments. I’ve also contributed to platforms like AddisFinancial, automating complex processes and enhancing system performance. 🌟 Certifications & Training 🌟 Verified Certifications (Credly / Official Providers) 🏅 Prompt Design in Vertex AI – Skill Badge  • Provider: Google Cloud  • Issued: November 2025 🏅 Implement Load Balancing on Compute Engine – Skill Badge  • Provider: Google Cloud  • Issued: November 2025 🏅 Google IT Support Professional Certificate (v2)  • Provider: Coursera  • Issued: December 2023 🏅 Tools for Data Science  • Provider: IBM  • Issued: June 2022 Additional Certifications & Courses 🏅 Spring Boot – Amigoscode  • Issued: July 2022 🏅 Java Programming Masterclass for Software Developers – Udemy  • Issued: May 2021 🏅 Full Stack Software Engineering – ALX 🏅 Java – HackerRank 🏅 Spring Boot & Spring Security – Amigoscode 🏅 Frontend Development – Johns Hopkins University (Coursera) 🌟 My Specializations 🌟 ✅ Java (8, 17+), Spring Boot, Spring Security, Spring Data ✅ Microservices, Kafka, RESTful API Design ✅ Domain-Driven Design (DDD), Hexagonal Architecture, Clean Architecture ✅ React.js, Next.js, TypeScript, Tailwind CSS ✅ Databases: PostgreSQL, MySQL, MongoDB ✅ Authentication: JWT, OAuth2, Role-Based Access Control ✅ Testing: JUnit, Mockito, Integration Testing ✅ CI/CD & DevOps Basics: Git, GitHub, Docker ✅ Cloud Platforms: AWS, DigitalOcean ✅ Agile Development, Clean Code, Performance Optimization Notable Projects & Contributions 🔹 Addis Wealth Management System – Scalable fintech platform built with Java, Spring Boot, and React. 🔹 Automated Exam Repository System – AI-powered exam parser with PDF/DOCX ingestion and dynamic question rendering. 🔹 Exam Version Generator – A tool for creating multiple randomized versions of exams with a live preview. 🔹 E-Commerce Platform (SportGoods) – Full-stack app with secure login, cart, and payment integration. 🔹 Task Management System – Java + MySQL app with full CRUD, user roles, and CSRF protection. 🔹 Full Stack Mentorship – Ongoing freelance mentorship for junior developers in React, Node.js, and backend fundamentals. 🎓 Education • BSc in Computer Science – Mattu University (2024) • ALX Full Stack Software Engineering Graduate Whether you're looking to architect a robust backend, launch a reliable frontend, or integrate a secure API layer, I’d love to collaborate and build something impactful with you. Let’s connect and make your vision a reality. 📌 Portfolio: my-portifolio-gutu.netlify.app 📌 Linkedn: linkedin.com/in/gutu-daniel

Hi there! My name is Sally Peck. Tech Stack: - Delphi | VCL | FMX | FastReports | DevExpress (Reference: CodePartners Pty Ltd). - C# | WPF | WinForms - Java Spring - Add-in-Express Team member (Outlook, Word, and Excel Add-in development) - CI/Build environment - Coding support | InstallShield | WIX Please see my happy customers and high ratings below.

Over 15 years of experience as a software developer, with a strong background in Java and Angular. Proven track record of delivering high-quality web applications on time and within budget. Skilled in working collaboratively in fast-paced, team-oriented environments. Proficient in a variety of development tools, including, Visual Studio, IntelliJ, and Git. Utilize AI-assisted development tools such as OpenCode and ClaudeCode to expedite coding and enhance efficiency. Tech Stack: ✅ Java ✅ Springboot ✅ Angular ✅ React Native ✅ Postgres / Mysql ✅ Typescript ✅ Unit testing / TDD / Spock / JUnit / Jasmine ✅ HTML ✅ CSS ✅ Git ✅ Open Code, Claude Code I can: ✅ Create custom complex websites ✅ Make mobile apps ✅ Automate boring tasks ✅ Create scripts for everyday use ✅ Optimize slow queries

Most ERPNext projects go over budget and under-deliver — not because the software is wrong, but because the implementation ignored how the business actually operates. That's the problem I've spent 13 years fixing. I build ERPNext implementations and Spring Boot backend systems for startups, SMEs, and enterprises that need things done right the first time. I'm Frappe Certified on ERPNext V15, and I've completed 38+ projects on Upwork with a 100% Job Success Score across $90,000+ in work — which means clients come back, and they refer others. 𝐖𝐡𝐞𝐫𝐞 𝐈 𝐚𝐝𝐝 𝐭𝐡𝐞 𝐦𝐨𝐬𝐭 𝐯𝐚𝐥𝐮𝐞: On the ERPNext side: end-to-end implementations, custom DocTypes, workflow automations, approval hierarchies, print formats, custom scripts, and REST API integrations with third-party tools. I understand the Frappe framework deeply enough to build what the standard modules can't. On the backend side: Spring Boot REST APIs and microservices with proper security (Spring Security, JWT, RBAC), JPA/Hibernate, clean architecture, and production-ready deployments. I've also handled Liferay 6.2/7.x portal development and Java + React/Angular enterprise portals for clients who needed both ERP and a custom frontend layer. What separates working with me from working with a developer who just executes tickets: I ask the two questions most developers skip before starting — what does your current process actually look like, and what does failure cost you? That conversation shapes everything and usually saves weeks of rework. Currently available. I reply within a few hours.

Highly accomplished Software Architect and Machine Learning Engineer with a solid mathematical background and 20+ years of experience. I specialize in bridging the gap between complex algorithmic research and high-performance system execution. My unique expertise combines advanced AI/ML development with a deep background in compiler design, domain-specific languages (DSLs), and low-level code optimization. Whether you need to develop production-grade ML models, optimize heavy computing algorithms, or build specialized software tools and custom IDEs, I deliver mathematically sound and architecturally robust solutions. 🧠 Core Expertise Machine Learning & Research: Algorithm development, statistical data processing, predictive modeling, and AI logic orchestration. Strong scientific and analytical background with proven experience in research and academic article writing. Compilers & DSL Engineering: Expert in the theory of formal languages, syntax analysis, parsers, and custom compilers. Prototyping and implementing Domain-Specific Languages (DSLs) tailored for specific business or technical domains. High-Performance & Optimization: Optimization of complex calculations, data structures, and database architectures for high-throughput systems. Full-Cycle Infrastructure: Designing client-server systems for massive data storage, visualization of observation results, and custom developer tools (Eclipse RCP/Xtext/Plugin development). TECHNICAL SKILLS SUMMARY 🤖 Machine Learning & Mathematics Algorithms & Math: Advanced Mathematics, Algorithm Design & Optimization, Statistical Analysis, Data Visualization. AI Logic: Neural Network integration, Data Processing pipelines, Game AI & Logic engines. Research: Scientific research, Data insights, Technical writing, and Academic publication standards. 🛠️ Compiler & DSL Development Formal Languages: Syntax Analysis, Parser Generation, AST Manipulation. Tools & Frameworks: Xtext, Xtend, ANTLR. IDE Development: Eclipse RCP, SWT/JFace, Custom Plugin Development. ☕ Enterprise Java & Backend Infrastructure Core Java: Java SE (High Performance), Java Reflection, Sockets/Networking. Frameworks: Spring (Core, MVC, AOP), Hibernate, JDBC. Data Processing: SAX, DOM, XSLT, Jasper Reports. Databases: PostgreSQL, MySQL. 📱 Legacy & Specialized Experience Desktop/Web UI: Swing, GWT, GXT. Cross-Platform & Graphics: LibGDX (Game engines/logic). Legacy Stack (ActionScript/Flex): Flex 4.6, ActionScript 3.0, Adobe AIR, Flash Media Server, PureMVC (valuable for legacy system migration). ⚙️ Tools & Workflow IDEs: IntelliJ IDEA, Eclipse. Build & Version Control: Maven, GIT, SVN. Architecture: Gang of Four (GoF) Design Patterns, Clean Architecture.

I help startups, agencies, and businesses build secure, scalable, and high-performance web applications using modern technologies and AI-assisted development workflows. With strong experience in backend engineering, API development, cloud infrastructure, and frontend frameworks, I deliver clean, maintainable solutions that are fast, reliable, and production-ready. What I Can Help You With ✅ Custom Web Application Development ✅ REST API & GraphQL Development ✅ SaaS Platforms & Business Systems ✅ AI-Assisted Development & Automation ✅ Third-Party API Integrations ✅ Performance Optimization & Security Hardening ✅ Legacy System Upgrade & Modernization ✅ Cloud Deployment & DevOps Setup Backend & Web Technologies • Laravel, Django, Spring Boot, Yii2 • Express.js, NestJS • WordPress, Drupal, Magento • PHP, Python, Java, JavaScript, TypeScript • MySQL, PostgreSQL, MongoDB, Redis Frontend Development • React.js, Vue.js • Tailwind CSS, Bootstrap • Alpine.js, Livewire, HTMX Cloud & DevOps • AWS, GCP • Docker, Kubernetes • CI/CD Pipelines • Linux, Nginx, Apache API & Integrations • Stripe, PayPal • Twilio, Firebase • Slack, Zapier, Xero • REST APIs & GraphQL AI Development Workflow I actively use modern AI development tools to improve delivery speed, code quality, debugging, and architecture planning: • Cursor • Claude • ChatGPT • GitHub Copilot Why Clients Work With Me ✔ Clean, maintainable, scalable code ✔ Fast communication & reliable delivery ✔ Strong debugging and problem-solving skills ✔ Production-ready deployment experience ✔ Security-focused development approach ✔ Ability to work independently and take ownership Whether you need a custom platform, backend API, cloud deployment, or ongoing development support, I can help turn your ideas into reliable software solutions. Let’s build something great together.

Oracle Certified Professional (OCP) Senior Software Engineer specialising in AI native Java, Spring, Web, mobile apps, and SaaS products. I help startups and businesses build scalable backend systems, enterprise platforms, and white-label mobile apps, and automate their CI/CD pipelines for fast, reliable deployments. What I deliver: - Java & Spring Boot microservices - Hybrid & native mobile apps (Flutter / React Native) - SaaS and white-label multi-brand solutions - Hospital Management Systems (HMIS), EHR, HL7 integrations - High-volume transactional SMS & IVR systems - Learning Management Systems (LMS) - AI integrations & AI content generation - CI/CD automation (GitHub Actions, Fastlane, Codemagic) - App Store & Play Store deployment - Automated pipeline deployment Tech stack: Java, Spring Boot, Microservices, AWS, Docker, Flutter, React Native, CI/CD, GitHub Actions, Fastlane, Codemagic, HL7, EHR, OpenAI API, SMS/IVR systems Open for Technical partner From code to production — I build, automate, and scale.

Need help fixing a slow API, production issue, or building scalable microservices? I can step in quickly and deliver. I'm a Java Backend Architect with 12+ years of experience building enterprise-grade systems across Telecom, Insurance, and E-commerce — systems handling millions of transactions daily with zero tolerance for downtime. In one recent engagement, I reduced API response time by 60% on an insurance platform processing 2M+ daily transactions by re-architecting the service layer with Spring Boot and Kafka-based event streaming. 🔧 What I can do for you: Fix slow or broken APIs and production issues Build scalable microservices using Spring Boot Design clean and reliable REST APIs Implement secure authentication (OAuth2, JWT, Keycloak) Modernize legacy systems 💡 What makes me effective: Hands-on from day one — no ramp-up time needed Strong debugging skills — I identify root causes fast, not just symptoms Real production experience at scale across regulated industries Clean, maintainable, production-ready code every time 🚀 To reduce your risk: Start with a small task or bug fix — see how I work before committing I'll review your system and flag issues immediately I can share working demos of similar implementations 💻 Tech Stack: Java, Spring Boot, Hibernate, JPA Angular / React, TypeScript Kafka, MongoDB, Oracle Docker, Kubernetes, AWS If you need someone who understands your system in hours, not days, and delivers without hand-holding — let's connect.

ᴛᴏᴘ ʀᴀᴛᴇᴅ ᴘʟᴜꜱ ᴜᴘᴡᴏʀᴋ ᴄᴏɴᴛʀᴀᴄᴛᴏʀ. ✅ AVAILABLE FOR NEW PROJECTS I'm a full-stack developer and long-term technical partner. I specialize in Java (Spring Boot) backends and modern React.js/Next.js/Tailwind frontends. I focus on clean architecture, performance, and systems that don’t break as you scale. Using tools like Kafka, Redis, and message-based architectures, I help decouple services, improve performance, and eliminate bottlenecks caused by tightly coupled APIs. This approach is especially useful for real-time features, background processing, and systems where consistency and responsiveness both matter. I’ve worked on everything from microservices and real-time apps to AI-integrated platforms and custom tools. I don’t just ship features, I help you make the right technical decisions so your product stays maintainable long-term. What I bring to your project: - Full-Stack Development, including frontend and backend - Using Java, Spring Boot - both microservices and monolith architecture - React.js/Next.js, Tailwind CSS for the frontend (including any other packages or component libraries such as shadcn or MUI) - MongoDB, MySQL, PostgreSQL, Redis - used for database and caching layer - API Design & Integration - Linux, Docker, CI/CD Pipelines - Discord Bots (JDA) - building discord bots using java discord API Go-to stack: Java (Spring Boot), React.js/Next.js, Tailwind CSS, PostgreSQL/MongoDB, Redis, Docker, Nginx I take ownership, communicate clearly, and move fast without sacrificing quality. If you’re looking for someone reliable who can build, improve, and scale your product, I’m here to help.

Alfresco Expert | Full-stack Developer (Angular+SpringBoot) | 12+ yrs exp in ECM, BPMN, Java Highly experienced Alfresco Developer and Full-stack Developer with 12+ years of expertise in Enterprise Content Management (ECM), Business Process Management (BPMN), and Java development. Skilled in SpringBoot, Angular2+, and RESTful web services. *Key Expertise:* - Alfresco Content Service and Alfresco Process Service - SpringBoot, Spring MVC, Spring REST - Angular2+, Angular - Java, JavaScript - RESTful web services - Enterprise Content Management (ECM), Business Process Management (BPMN) - Full-stack development (Angular+SpringBoot) *Technical Skills:* - Alfresco ECM, BPMN - Java, Spring, Hibernate, Maven - SpringBoot, Spring MVC, Spring REST - Angular2+, Angular - RESTful web services - JavaScript, HTML/CSS - Database: MySQL, Oracle, MongoDB *What I Offer:* - Custom Alfresco development and integration - Full-stack development using Angular and SpringBoot - RESTful web service implementation - ECM and BPMN solutions - Scalable and efficient software development *Why Hire Me:* - 12+ years of experience in Alfresco development and Java - Proven track record of delivering successful projects - Strong technical expertise and problem-solving skills - Excellent communication and collaboration skills - Adaptable and flexible with changing project requirements