Jonathan Muller

Senior Full Stack Software Engineer

London Stock Exchange Group • Fulltime

Dec 2025 - Present • 7 mos

I engineer high-performance software solutions for mission-critical financial systems where reliability, security, scalability, and low latency are essential. Working in a collaborative engineering environment, I design, develop, test, deploy, and maintain production-grade applications that process real-time data while meeting strict quality and performance standards. My work covers the entire software development lifecycle, including requirements analysis, system architecture, backend development, frontend implementation, API integration, database design, testing, deployment, monitoring, optimization, and long-term maintenance. I collaborate with cross-functional teams to transform complex business requirements into scalable, maintainable, and efficient software solutions. As a Full Stack Software Engineer, I build custom web applications, enterprise platforms, SaaS products, responsive websites, and internal business tools using modern frontend and backend technologies. I develop secure RESTful APIs, integrate third-party services, design optimized SQL and NoSQL databases, implement authentication and authorization, and improve application performance through clean architecture and efficient code. I also contribute to cross-platform mobile application development, delivering Android and iOS applications with cloud integration, secure backend communication, real-time data synchronization, and intuitive user experiences. I actively participate in code reviews, debugging, automated testing, CI/CD pipelines, version control, and Agile development while writing clean, reusable, and maintainable code. My expertise includes software development, full stack development, custom website development, mobile app development, REST API development, cloud integration, database engineering, software architecture, application optimization, debugging, and delivering production-ready solutions that solve complex technical challenges.

Full Stack Software Developer

SAP • Fulltime

Jan 2020 - Dec 2022 • 2 yrs 11 mos

I contributed to the development of enterprise software solutions that helped businesses improve operational efficiency through scalable and secure digital applications. Working in a collaborative Agile environment, I partnered with software engineers, product managers, designers, and QA teams to deliver high-quality software that met technical and business objectives. My responsibilities included the full software development lifecycle, from requirements analysis and system design to frontend and backend development, API integration, database design, testing, deployment, optimization, and maintenance. I developed responsive web applications, internal business platforms, and custom software solutions while ensuring performance, security, and maintainability. I built reusable frontend components, developed backend services, created secure RESTful APIs, integrated third-party platforms, optimized SQL databases, and implemented authentication and authorization systems. I also participated in debugging, code reviews, automated testing, performance tuning, and CI/CD workflows to improve application quality and engineering efficiency. Working on enterprise-scale projects strengthened my understanding of software architecture, cloud-based applications, modern development frameworks, and collaborative engineering practices. I consistently focused on writing clean, reusable, and maintainable code while following industry standards for version control, documentation, security, and continuous delivery. My expertise includes software development, full stack development, custom website development, enterprise web applications, REST API development, database engineering, cloud integration, application optimization, debugging, Agile development, software architecture, and delivering reliable production-ready solutions that solve complex business challenges and support long-term digital growth.

Software Engineering Intern

Google

May 2022 - Aug 2022 • 3 mos

During my internship, I collaborated with experienced software engineers to design, develop, and improve scalable software solutions supporting internal products and engineering workflows. I gained hands-on experience working in a large-scale development environment where code quality, performance, security, and maintainability were fundamental to every stage of the software development lifecycle. My responsibilities included implementing new features, debugging production issues, optimizing existing code, writing unit tests, reviewing pull requests, and contributing to technical documentation. I worked with modern development tools, version control systems, continuous integration pipelines, and agile methodologies while learning how large engineering teams deliver reliable software at scale. I contributed to backend services, RESTful APIs, data processing components, and responsive web interfaces while collaborating closely with product managers, designers, and senior engineers to translate technical requirements into efficient, user-focused solutions. I also participated in architecture discussions, performance analysis, database optimization, and software testing to improve application reliability and user experience. This experience strengthened my foundation in software engineering principles, object-oriented programming, data structures, algorithms, cloud technologies, and scalable system design. It also enhanced my communication, collaboration, and problem-solving skills while reinforcing best practices for writing clean, reusable, maintainable, and production-ready code. Through this role, I developed practical experience in software development, full stack development, custom web application development, backend engineering, API integration, database design, cloud services, debugging, performance optimization, automated testing, and delivering high-quality software solutions that meet real business needs.