Kayvan H.

I am a Senior Software Engineer and founder with a proven track record in designing, developing, and optimizing complex back-end systems. I specialize in Java, microservices, cloud solutions, and financial software development. My goal is to build scalable, secure, and efficient systems that meet the diverse needs of modern businesses. What I bring to the table: Back-End Development Expertise: Extensive experience with Java (8-21), Spring Boot, and Node.js in building scalable, high-performance applications. Financial Systems & Data Processing: I've led back-end development for financial market websites and banking systems, including core banking, instant payment systems, and data analytics. Founder & Product Builder: I built Ledgiq Ltd (UK-incorporated) from the ground up — an AI-powered payment reconciliation SaaS for UK SMEs, integrating Open Banking APIs, Stripe, and Xero with a machine learning matching engine. Sole engineer across the full stack: backend, API integrations, infrastructure, and CI/CD. Cloud & DevOps Knowledge: Proficient in cloud-native development on AWS and Azure, coupled with a strong understanding of CI/CD pipelines using Jenkins, Docker, and Kubernetes. Scalable Architectures: Deep knowledge in microservices, RESTful APIs, and event-driven systems, ensuring your applications are scalable, maintainable, and future-proof. Team Leadership: I've mentored teams, conducted code reviews, and implemented best practices in software engineering, from development to deployment. Active Contributor on StackOverflow: With +3K points and a positive impact on 3.4 million users, I regularly contribute to solving technical problems and sharing knowledge with the community. Notable Achievements: Founded Ledgiq Ltd, an AI-powered fintech SaaS — built solo end-to-end, UK-incorporated, with ICO registration and Open Banking integration in progress. Led major projects for companies like Glovo, ING, and British Petroleum, delivering high-impact, secure solutions. Contributed to open-source projects like IBAN4j and wrote technical articles for Baeldung. Passionate about clean code, and consistently improve the development process through automation and agile methodologies. If you're looking for a seasoned software engineer who understands the intricacies of building and maintaining robust back-end systems — and who has also walked the path of building a product from zero — I would be thrilled to help you turn your vision into reality.