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I'm a .NET and Azure developer with experience in ASP.NET Core, C#, Blazor, EF Core, Clean Architecture, and CQRS. I assist SaaS founders and CTOs in creating multi-tenant platforms that can grow to millions of users, incorporating RAG and AI pipelines along with clean microservices. I have over 9 years of experience, 4,700 hours on Upwork, and a perfect Job Success Score. I’m also Top Rated Plus. Where I provide the most value: SaaS architecture, whether starting from scratch or modernizing existing systems. I focus on multi-tenancy, role-level security, billing through Stripe, role-based access, CI/CD, and observability. I get it right the first time, so you won't need to rebuild in 18 months. Integrating AI into existing .NET applications using Azure OpenAI, Semantic Kernel, RAG with Azure AI Search or Pinecone, and creating agent-based workflows. This approach maintains your current tech stack. Modernizing enterprise .NET systems from .NET Framework 4.x to .NET 8 or 10, along with Blazor and Azure App Services. Typical outcomes include a 40 to 60 percent reduction in infrastructure costs and a three to five times increase in deployment frequency. Designing scalable APIs and microservices with CQRS, MediatR, Ocelot or YARP gateway, RabbitMQ or Azure Service Bus, Docker, and Kubernetes. I implement event-driven designs where appropriate, rather than as a default. Handling third-party and enterprise integrations, including OAuth2, Xero, Autodesk ACC, Aconex, Microsoft Graph, HubSpot, and custom REST or webhook backends. I take responsibility for authentication, token handling, and data mapping, beyond just the happy path. I specialize in ASP.NET Core, C#, Azure, Blazor, PostgreSQL, SQL Server, MongoDB, Docker, Semantic Kernel, MediatR, CQRS, RabbitMQ, EF Core, Dapper, and n8n. I choose my projects carefully. If you need someone who will take charge of architectural decisions rather than just executing tasks, let’s have a conversation.

Most backend engineers can write code. Fewer can architect a system that holds up at scale, survives a traffic spike, and stays observable when something breaks at 2am. That's the gap I fill. I'm a Top Rated Plus engineer on Upwork with a 100% Job Success Score across 34 contracts and 4,600+ hours — working with clients from startups to enterprises across ticketing, marketplace, gaming, and HR domains since 2011. What I actually do: I design and build production-grade backend systems in Go — from the API layer down to the infrastructure. That means event-driven microservices with Kafka or RabbitMQ, containerized deployments on Kubernetes, full CI/CD pipelines, and cloud infrastructure on AWS, GCP, DigitalOcean, or Alibaba Cloud. I don't hand you a working local demo and disappear — I deliver something that runs reliably in production, with proper observability, testing at every layer, and documentation your team can maintain. Specifically, I can help you if: — Your monolith is becoming a bottleneck and you need to decompose it into services that scale independently — You're building a new product and need a senior engineer who can own the backend architecture from day one — Your Kubernetes setup is held together with hope and tribal knowledge, and you need someone to make it solid — You need CICD that actually works — automated testing, container builds, and deployments to staging and production without manual steps Tech I work with daily: Go · PostgreSQL · Redis · Kafka · RabbitMQ · Elasticsearch · Docker · Kubernetes · Helm · Terraform · AWS · GitHub Actions · GitLab CI · gRPC · REST How I work: I ask the right questions before writing the first line of code. I communicate in plain language, not jargon. I've worked in agile teams, solo, and everything in between — I adapt to your workflow, not the other way around. And I treat your codebase like I'll be the one maintaining it, because sometimes I am. If you need a senior engineer who thinks in systems, communicates clearly, and delivers work you won't have to redo — let's talk.

I am a Senior .NET Developer and Solution Architect with 12+ years of experience designing, developing, and scaling enterprise applications, startup MVPs, and long-term software products. I help businesses transform ideas into reliable, maintainable, and scalable solutions using modern Microsoft technologies and cloud platforms. Whether you need an MVP to validate a startup concept, modernization of a legacy application, or architecture guidance for a growing product, I can contribute both technically and strategically. What I specialize in: ✅ Enterprise Web Applications ✅ Startup MVP Development ✅ SaaS Platforms & Multi-Tenant Systems ✅ Microservices & Distributed Architecture ✅ RESTful APIs & Third-Party Integrations ✅ Legacy Application Modernization ✅ Long-Term Product Development Partnerships ✅ Technical Leadership & Architecture Consulting Core Technologies Backend C#, ASP.NET MVC, ASP.NET Core (.NET 6/7/8) REST APIs, OAuth, JWT Authentication Entity Framework, Dapper, ADO.NET Microservices, Clean Architecture, SOLID Principles Unit & Integration Testing (xUnit, NUnit, Moq) Frontend React TypeScript JavaScript, jQuery HTML5, CSS3, Bootstrap Databases SQL Server PostgreSQL MySQL MongoDB and other NoSQL solutions Cloud & DevOps Microsoft Azure (Azure SQL, App Services, Functions, Storage) AWS GitHub, Azure DevOps, Bitbucket Agile and Scrum methodologies Why Clients Work With Me ✔ Top Rated Plus freelancer with a 100% Job Success Score ✔ 12+ years of professional software development experience ✔ Strong focus on clean, maintainable, and scalable code ✔ Experience working with both startups and enterprise organizations ✔ Clear communication and long-term partnership mindset I believe software development is not just about writing code—it's about understanding business goals and building solutions that deliver measurable value. If you're looking for an experienced .NET professional who can architect systems, lead development efforts, or become a long-term technology partner, I'd be happy to discuss your project. Thank you

𝗝𝗮𝘃𝗮 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 🖥️, 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 🌱, 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 🛠️, 𝗔𝗪𝗦 ☁️, 𝗥𝗘𝗦𝗧 𝗔𝗣𝗜𝘀 🔗 I help businesses build scalable, secure, and high performance backend systems that handle growth without slowing down. Most applications work well in the beginning. The problems start when traffic increases. APIs become slow, deployments become risky, and maintaining the code becomes expensive. That's where I come in. 𝗔𝘀 𝗮 𝗦𝗲𝗻𝗶𝗼𝗿 𝗝𝗮𝘃𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝘄𝗶𝘁𝗵 𝟭𝟯+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲, I've helped startups and enterprise companies design, build, and optimize backend systems that scale reliably in production. I am not just a Java Developer who writes code. I help businesses create backend architectures that support growth, improve performance, and reduce technical debt. 𝗥𝗲𝘀𝘂𝗹𝘁𝘀 𝗜'𝘃𝗲 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 • Built scalable Java Developer solutions serving thousands of daily users with high availability. • Designed Microservices architectures that reduced deployment risks and improved system reliability. • Developed Spring Boot applications that improved API response times and backend performance. • Helped businesses migrate legacy systems into modern Java Developer architectures. • Delivered production ready backend platforms for startups and enterprise organizations. Every project starts with a business goal and ends with measurable results. 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗼 𝗝𝗮𝘃𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • Custom backend application development • Enterprise Java solutions • Legacy application modernization • Backend performance optimization • Secure and maintainable architecture 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • REST API development • Spring Security • Spring Data JPA • Authentication and authorization • Scalable backend services 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 • Distributed systems design • Service decomposition • API Gateway implementation • Event driven architecture • System scalability and resilience 𝗔𝗪𝗦 𝗖𝗹𝗼𝘂𝗱 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 • AWS deployment and infrastructure • EC2, ECS, Lambda • Cloud architecture design • Monitoring and optimization • Cost effective cloud operations 𝗥𝗘𝗦𝗧 𝗔𝗣𝗜 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • API design and implementation • Third party integrations • Payment gateway integration • Documentation and testing • Secure API architecture 𝗪𝗵𝗮𝘁 𝗠𝗮𝗸𝗲𝘀 𝗠𝗲 𝗗𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 Most Java Developers focus only on writing code. I focus on the business impact of the software. 𝗕𝗲𝗳𝗼𝗿𝗲 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗮𝗻𝘆𝘁𝗵𝗶𝗻𝗴, 𝗜 𝗮𝘀𝗸: • Will this architecture still work when traffic grows? • Can future developers maintain it easily? • Is it secure? • Is it optimized for performance? • Can it scale without major rewrites? This approach helps clients avoid costly problems later. 𝗪𝗵𝗼 𝗜 𝗪𝗼𝗿𝗸 𝗕𝗲𝘀𝘁 𝗪𝗶𝘁𝗵 • Startups building new SaaS products • Businesses scaling existing applications • Companies modernizing legacy Java systems • Teams adopting Microservices architecture • Organizations migrating workloads to AWS • Businesses needing secure and scalable REST APIs 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 Java, Spring Boot, Spring Security, Hibernate, JPA, Microservices, AWS, Docker, Kubernetes, REST APIs, Kafka, RabbitMQ, PostgreSQL, MySQL, MongoDB, Redis, Maven, Gradle, Git, CI/CD, Jenkins 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲 • 13+ years of Java Developer experience • Clean, maintainable code • Scalable backend architecture • Strong communication • Reliable delivery • Long term technical thinking If you're looking for a Java Developer who understands both software engineering and business objectives, let's discuss your project. Send an invitation and I'll respond within a few hours. Keywords: Java Developer, Senior Java Developer, Java Backend Developer, Java Software Engineer, Spring Boot Developer, Spring Boot Expert, Java Application Development, Enterprise Java Developer, Java Web Services, REST API Developer, RESTful API Development, Backend Developer, Backend Engineer, Microservices Developer, Microservices Architecture, Distributed Systems, AWS Developer, AWS Cloud Engineer, Java AWS Developer, Docker, Kubernetes, Kafka, RabbitMQ, Hibernate, JPA, Spring Security, API Integration, Database Design, PostgreSQL, MySQL, MongoDB, Redis, SaaS Backend Development, Scalable Application Development, Cloud Native Applications, Java Consultant, Software Architecture, System Design, Enterprise Application Development, Performance Optimization, CI/CD, Jenkins, Maven, Gradle, Full Stack Java Developer.

I help startups turn React/Next.js frontends into production-ready SaaS platforms with real backend architecture behind them, not just API calls duct-taped to someone else's system. 🏆 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 · ✅ 𝟓𝟎+ 𝐣𝐨𝐛𝐬 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞𝐝 · ⏳ 𝟏𝟓+ 𝐲𝐞𝐚𝐫𝐬 𝐬𝐡𝐢𝐩𝐩𝐢𝐧𝐠 𝐟𝐮𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 Most "full stack" developers own the frontend and hand off the backend to someone else. I own both - React/Next.js on the frontend, .NET Core or Node.js on the backend, deployed and production-ready end to end. That means fewer handoffs, faster iteration, and a system that's architected consistently from database to UI instead of stitched together. ──────────────────────────────── 𝐑𝐎𝐋𝐄𝐒 𝐈 𝐓𝐀𝐊𝐄 𝐎𝐍 (𝟏𝟓+ 𝐘𝐄𝐀𝐑𝐒 𝐄𝐗𝐏𝐄𝐑𝐈𝐄𝐍𝐂𝐄) ──────────────────────────────── ✔ Full Stack Developer / Full Stack Engineer ✔ React Developer / React.js Developer / Next.js Developer ✔ Frontend Developer - component architecture, state management, performance ✔ .NET Developer / .NET Core Developer / C# Developer (backend & full stack) ✔ SaaS Developer / Multi-Tenant SaaS Architect ✔ Angular Developer (8–20) for teams standardized on Angular ──────────────────────────────── 🛠️ 𝐂𝐎𝐑𝐄 𝐓𝐄𝐂𝐇 𝐒𝐓𝐀𝐂𝐊 ──────────────────────────────── Frontend: React.js, Next.js, Angular, TypeScript, JavaScript, Tailwind CSS Backend: .NET Core, ASP.NET Core, C#, Node.js, Web API, Entity Framework, Microservices, REST APIs Cloud & DevOps: Microsoft Azure, AWS, Docker, CI/CD Database: SQL Server, PostgreSQL, MongoDB Also comfortable with: Python (FastAPI, Django, Flask) used when a project calls for it ──────────────────────────────── 🚀 𝐏𝐑𝐎𝐉𝐄𝐂𝐓𝐒 𝐈'𝐕𝐄 𝐃𝐄𝐋𝐈𝐕𝐄𝐑𝐄𝐃 ──────────────────────────────── 🔹 𝐍𝐢𝐧𝐣𝐚𝐃𝐀𝐌 - Multi-tenant SaaS, AWS S3/CloudFront, subscription billing. Solved schema-per-tenant isolation so tenant data never crosses. 🔹 𝐗𝐞𝐧𝐨𝐩𝐡𝐨𝐧 - Legal transcription platform, real-time AI (Whisper, Google STT). Solved speaker ID accuracy for court-admissible transcripts. 🔹 𝐀𝐜𝐞𝐌𝐌𝐈 - AI coaching platform, OpenAI-powered scoring across 8 competencies. Rebuilt the async queue after serverless timeouts broke under load. 🔹 𝐑𝐨𝐬𝐞 𝐏𝐎𝐒 - Restaurant POS system, React + Electron + FastAPI. Built a print queue with retries so a jammed printer never blocks an order. 🔹 𝐅𝐋𝐗 𝐍𝐞𝐭𝐰𝐨𝐫𝐤𝐬 - B2B wealth management platform, React + Node + AWS/Azure. Unified fragmented multi-party workflows into a single coherent system. 🔹 𝐕𝐚𝐬𝐭 𝐀𝐝𝐯𝐢𝐬𝐨𝐫 - Compliance SaaS for investment advisors, Blazor + .NET. One shared data layer powering independently operating client dashboards. 🔹 𝐋𝐎𝐊𝐑 - IoT smart parcel locker SaaS, FastAPI + React. Cut failed deliveries 80% by fixing real-time state sync between hardware and software. 🔹 𝐌𝐨𝐧𝐭𝐚𝐠𝐞 - Software licensing & digital commerce platform, ASP.NET + SQL Server. Automated the full license lifecycle with zero payment calculation errors. 🔹𝐑𝐚𝐩𝐫𝐨𝐝 - B2B marketplace with a real-time bidding engine. Held pricing accuracy under concurrent buyer/supplier load. 🔹 𝐎𝐧𝐭𝐫𝐚𝐜𝐤 𝐂𝐚𝐫𝐞𝐞𝐫𝐬 - Rescued a broken AI career platform. Fixed auth (OTP, OAuth, subscription bypass) without a full rewrite. 🔹𝐂𝐫𝐞𝐰 𝐏𝐥𝐚𝐧𝐧𝐞𝐫 - Maritime fleet & crew management, Angular + .NET. Built certification-expiry logic that correctly cascades across assignments. 🔹 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐚 - AI analytics dashboard for university career centers. Replaced manual spreadsheets with role-filtered predictive reporting. ──────────────────────────────── 🏆 𝐖𝐇𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐖𝐎𝐑𝐊 𝐖𝐈𝐓𝐇 𝐌𝐄 ──────────────────────────────── ✅ Top Rated Plus - 50+ jobs completed on Upwork ✅ 15+ years shipping production frontend + backend systems ✅ Comfortable owning a project end-to-end or slotting into an existing team ✅ Enterprise client feedback: "demonstrated excellent technical knowledge and professionalism. Delivered high-quality work on time and was reliable throughout" ✅ Several contracts have run 6+ months, clients keep me on past the first milestone ✅ Clear communication, honest scoping, no surprises If you need a Full Stack Developer who can own a React frontend and a real backend behind it, send me your project and I'll respond within a few hours.

🥇TOP RATED PLUS | 👨🏻‍💻 4000+ WORKING HOURS 💼 7+ YEARS EXPERIENCE | 🏆100% Job Success ⭐️⭐️⭐️⭐️⭐️ "I had the pleasure of managing Dasun (Era), a senior software engineer, on our recent project, and I must say, it was a fantastic experience. Era's code was top-notch, well-structured, and he always delivered more than we expected. What really stood out was Era's communication skills; he kept the team in the loop, asked smart questions, and had great suggestions. Working with Era was a breeze - he was professional, met deadlines, and handled challenges with ease. I can't wait to hire him again ASAP; he's a star in our team! ⭐️⭐️⭐️⭐️⭐️"I was very happy with the work from Era on a spring web flux project. He produced code that was excellent quality and proactively fixed issues and made improvements as he worked through the tasks." I am a seasoned software engineer with over 7 years of experience, specialising in Java, Spring Boot, and REST API development. My passion lies in tackling new challenges and establishing long-lasting collaborations that drive innovation and excellence in every project. Technical Expertise: ✅ Proficient in Java, including Java 8, Java 11, Java 17. ✅ Expertise in developing web applications in the Banking and Financial domain for over the 5 years. ✅ Backend development experience with Spring Boot Spring webflux, REST API development, application security, scalability, and proficiency in Spring Data JPA, Hibernate, Spring Cloud, and Spring Security. ✅ Proficiency in Microservice design pattern with Clean code principals and Domain Driven Design and inter service async communication with Event-Driven architecture, CQRS (Command Query Responsibility Segregation), SAGA patterns, Load balancing, Config management, and Gateway implementation. ✅ Knowledge of application security best practices, including OAuth 2 implementation, JWT token-based authentication, and authorization. ✅ Experience in Test-Driven Development (TDD) and unit testing using JUnit 5 and Mockito, as well as snapshot testing with Jest and Enzyme. ✅ Familiarity with both relational and NoSQL databases, including MySQL, Oracle, PostgreSQL, MongoDB, and Amazon QLDB. ✅ Hands-on experience with AWS, including designing and implementing highly scalable and secure infrastructure plans, application deployment, and CI/CD pipelines using AWS services like CodeCommit. Proficiency in migrating on-premises applications to the AWS cloud. ✅ Expertise in DevOps practices, including CI/CD with Jenkins and GitHub Actions, containerization using Docker, terraform script development, Ansible, Container Orchestration with Kubernetes clusters and Amazon EKS (Elastic Kubernetes Service), and version control using Git. ✅ Experience in setting up monitoring and logging solutions like Prometheus, Grafana, ELK (Elasticsearch, Logstash, Kibana), or AWS CloudWatch to ensure the health and performance of applications. ✅ Understanding of distributed system concepts, including message brokers like Apache Kafka or RabbitMQ, and the implementation of distributed transactions. ✅ Expertise in optimising application performance, including profiling, caching strategies, and database query optimisation. ✅ Proficiency in modern Software Development Life Cycle (SDLC) methodologies, including Agile (SCRUM), and tools such as Jira, Confluence, and SonarQube. ✅ Mastery of Object-Oriented Programming (OOP) concepts, SOLID principles, and Data Structures & Algorithms. I have a proven track record of delivering exceptional results for my clients, including: ☑ Boosting client revenue by 30% through targeted web application improvements. ☑ Increasing code quality by 80% using best practices and the Boy Scout Rule. ☑ Mentoring junior developers to enhance their Java skills and problem-solving abilities. I am confident that my strong technical background and commitment to excellence will make me an asset to your team. If you would like to discuss how I can contribute to your next project, please don't hesitate to reach out. Thank you for considering my application, and I look forward to speaking with you soon. Best regards, Dasun.