Leeroy Msizi Ncube
Senior Software Engineer
ncubelee04@gmail.com
+32 498 06 05 28
Aalst, Belgium
Java microservices expert adept at crafting scalable solutions with Spring Boot, AWS, and Kubernetes.
Specializes in modern JavaScript technologies, with a focus on Angular & React.
Driven by clean code, CI/CD automation, and cutting-edge technology.
Technical Skills & Methodologies
Core Java & Backend
Java
Spring Boot
JEE
Microservices
Python
RESTful APIs
Database Development
Full Stack Development
Angular
ReactJS
HTML5
CSS3
JavaScript
TypeScript
Cloud & Containerization
AWS
Kubernetes
AWS EKS
Docker
AWS Amplify
AWS EC2 & Elastic LB
AWS Lambda
AWS SES
AWS SQS
AWS RDS
AWS S3
Databases & Messaging
MySQL
PostgreSQL
Oracle
Redis
RabbitMQ
Amazon SQS (Simple Queue Service)
JMS (Java Messaging Service)
DevOps & Automation
Gitlab CI
ArgoCD
Jenkins
ELK (Elastic, Logstash & Kibana)
New Relic
Testing, Security & Methodologies
JUnit
Mockito
Cucumber
SonarQube
TestRail
OAuth 2.0
JWT
Spring Security
Agile Methodology
Professional Experience
Senior Software Engineer
S-Mobile (Belgium)Feb 2024 - Present- Spearheaded the design and development of Java 11+ microservices using Spring Boot and MySQL, resulting in a 20% increase in system efficiency.
- Automated microservice deployment to AWS EKS(Kubernetes) using Gitlab CI/CD, Docker, and ArgoCD,reducing deployment time by 40%.
- Developed and executed comprehensive unit and integration tests using JUnit and Cucumber, achieving 90% code coverage and a 15% reduction in bug reports.
- Enhanced microservice API security by implementing Spring Security and Keycloak, mitigating potential vulnerabilities and ensuring compliance with industry standards.
- Managed and optimized a multi-tenancy database in PostgreSQL, supporting 100+ tenants with 99.99% uptime.
- Resolved an average of 10 critical bugs per month in the microservice suite, improving overall system stability and user satisfaction.
- Designed and developed 7+ new frontend and UI features using Angular 14, resulting in a 25% improvement in user engagement metrics.
- Successfully migrated 3+ microservices to Spring Boot 3 and Java 21, enhancing performance by 30% and reducing technical debt.
- Developed and deployed 5+ AWS Lambda functions in Python, automating key processes and reducing manual intervention by 50%.
- Coached and mentored a cross-functional team of 8 software developers, 5 software testers and 3 devOps personnel in Agile methodology, resulting in a 20% improvement in team velocity and a 10% reduction in sprint completion time.
- Utilized Jira to effectively manage and track 25+ projects and workstreams, ensuring on-time delivery and adherence to project milestones.
Senior Software Engineer
Cellulant (Kenya)July 2022 - Jan 2024- Led the design and development of 6 Java 11+ microservices using Spring Boot and MySQL.
- Implemented comprehensive unit and integration tests using JUnit, Wiremock, and Cucumber, achieving 85% code coverage and reducing production incidents by 20%.
- Reduced UI bugs by 30% by implementing robust debugging and fixing processes using Angular 12.
- Automated microservice deployment to AWS EKS using Gitlab CI/CD, Docker, and ArgoCD, resulting in a 50% reduction in deployment time and improved system uptime.
- Led and mentored a team of seven developers, improving team productivity by 25% and reducing code review turnaround time by 15%.
- Facilitated agile ceremonies (daily scrums, PI Planning, retrospectives, refinement), resulting in a 15% improvement in sprint planning accuracy and team collaboration.
- Reviewed code from junior developers, providing constructive feedback that led to a 20% reduction in code defects and improved code quality.
- Effectively managed and tracked 15+ projects and workstreams using ClickUp, ensuring on-time delivery and adherence to project milestones.
- Implemented and maintained Newrelic observability dashboards, reducing Mean Time to Resolution (MTTR) for production issues by 30%.
- Developed and maintained a robust event-driven architecture using RabbitMQ, enabling asynchronous communication and improving system scalability by 40%.
- Implemented 5+ integrations to third-party systems via REST and SOAP, enabling seamless data exchange and expanding the platform's capabilities.
- Implemented caching strategies using Guava and Redis, improving API response times by 35% and reducing database load.
- Generated an average of 10 adhoc SQL queries per month for reporting purposes, providing valuable insights for business decision-making.
Lead Software Engineer
Ecocash Holdings (Zimbabwe)Mar 2019 - June 2022- Led the design and development of 8 Java 8+, microservices using Spring Boot and MySQL.
- Developed 4 in-house libraries, reducing code duplication, by 20% and improving development efficiency across the, team.
- Implemented 10+ integrations to third-party systems via, REST, SOAP, and SMPP, enabling seamless data, exchange and expanding platform functionality.
- Implemented comprehensive unit and integration tests, using JUnit and Cucumber, achieving 90% code coverage, and reducing bug reports by 12%.
- Managed the deployment of 9 microservices in WebLogic, application server, ensuring 99.9% uptime.
- Led and mentored a cross-functional team of 10+, members across three geographical regions, improving, team collaboration and productivity by 20%.
- Effectively managed and tracked 20+ projects and, workstreams using Jira, ensuring on-time delivery and, adherence to project milestones.
- Developed and maintained 3+ USSD applications, serving, over 2 million users and generating significant revenue, for the company.
- Implemented CI/CD pipelines using Jenkins 2.0, reducing, deployment time by 40% and improving release, frequency.
- Generated an average of 35 SQL queries per month on, Oracle DB for troubleshooting and reporting, providing, valuable, insights, decision-making. for, issue, resolution, and,
- Implemented comprehensive unit using JUnit, achieving, 75% code coverage and reducing production incidents by, 10%.
- Enhanced microservice API security by implementing, Spring Security and Keycloak, mitigating potential, vulnerabilities and ensuring compliance with industry, standards.
- Reduced UI bugs by 25% by implementing robust, debugging and fixing processes using Angular 12.
- Developed and maintained a robust event-driven, architecture using RabbitMQ, enabling asynchronous, communication and improving system scalability by 30%.
Software Engineer
Zimbabwe Shared ServicesApr 2017 - Feb 2019- Led the design and development of 10+ Java 8+ microservices using Spring Boot and MySQL.
- Developed and maintained 5+ USSD applications, serving over 2 million users and processing over 5 million requests daily.
- Implemented 20+ integrations to third-party systems via REST, SOAP, and SMPP, enabling seamless data exchange with various banking systems.
- Implemented unit testing using JUnit, achieving 85% code coverage and reducing integration issues by 20%.
- Successfully integrated with Postilion (ISO8583), FlexCube, and T24 core banking systems, ensuring seamless transaction processing for over 10 banks.
- Developed 5+ in-house libraries, reducing code duplication by 15% and streamlining development processes.
- Generated 40+ adhoc SQL queries per month for reporting purposes, providing valuable insights for decision-making and performance monitoring.
- Led research and development into 5+ new technologies and frameworks, resulting in the adoption of three key technologies that improved system performance by 10%.
- Reduced UI bugs by 20% by implementing robust debugging and fixing processes using Angular 12.
- Reviewed and refined a monthly average of 25 business requirements, ensuring they were clear, concise, and technically feasible, reducing ambiguity and improving project outcomes.
- Implemented CI/CD pipelines using Docker, Gitlab CI/CD, and Bamboo, reducing deployment time by 50% and improving release frequency.
- Implemented and maintained Kibana observability dashboards, reducing Mean Time to Detect (MTTD) for production issues by 40%.
- Led and mentored a sub-team of 4 members using Scrum, improving team velocity by 20% and ensuring on-time delivery of projects.
- Effectively managed and tracked 25+ projects and workstreams using Youtrack, ensuring adherence to project timelines and milestones.
- Reviewed code from junior developers, providing constructive feedback that led to a 25% reduction in code defects and improved overall code quality.
Software Engineer
Getcash (Zimbabwe)Aug 2016 - Mar 2017- Led the design and development of a JEE application in Java 7 and MySQL, handling 10,000+ daily transactions.
- Managed the deployment of the JEE application in Glassfish application server, ensuring 99.8% uptime.
- Implemented 5+ integrations to third-party systems using PHP with Laravel, enabling seamless data exchange.
- Implemented unit testing in JUnit, achieving 80% code coverage and reducing bugs by 10%.
- Led a team of seven developers using Scrum, improving team velocity by over 25%.
My Projects
Tingg Payments Gateway
I was part of the team that developed the payments gateway during my time at Cellulant. With Tingg, you can collect and make payments from anywhere in Africa.
Java 11Angular 12MySQLKubernetesAWSAgile
Pilim
I was part of the team that developed the business management tool at S-Mobile. With Pilim, you can automate your business processes, reducing the operational workload by at least 30%.
Java 21Angular 14MySQLPostgreSQLKubernetesAWSPythonAgile
EcoSure
I was part of the team that developed the funeral insurance system at Ecocash Holdings. With EcoSure, you can insure yourself as well as your immediate and extended family members in case of death.
Java 8Spring BootAngularJSMySQLScrum
Testimonials
"Working with Leeroy was a game-changer for our project. His ability to bridge complex technical challenges with elegant solutions is unparalleled."
Godwin Mashiri
Chief Life & Principal Officer
Econet Life (Pvt) Ltd.
"Leeroy is an exceptional full-stack engineer who consistently delivers high-quality, scalable solutions. His technical expertise and problem-solving skills are truly remarkable."
Clayton Murungu
Head of Engineering
Zimbabwe Shared Services
"Leeroy's expertise in microservices and cloud architecture transformed our development process. His code is clean, efficient, and always well-documented."
George Kihara
Senior Software Engineering Manager
Cellulant (Kenya)
Contact Me
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