Mentored and coached 4 Junior developers.Updated legacy code bases to align with modern development standards, achieving a 32% improvement in efficiency by incorporating technologies i.e., Cassandra NoSQL, Java 8 Streams, Stored Procedures, and messaging queues, along with workers and brokers like Apache ActiveMQ, Apache Kafka, React.Js, AWS Lambda. Conducted in-depth analysis of website traffic patterns, user interactions, and product preferences using Google Analytics and other tools, contributing to a 25% enhancement in the user experience. Skills: Collaboration, Communication, Big data, performance, high availability, concurrency, and security issues. Collaborated with 9 globally distributed cross-functional engineering teams using tools (Version control i.e. Git, Jira, Confluence), employing Agile Scrum methodology to assess and enhance our internal reporting and evaluation tool which simplified the reporting by 43%. Skills: Pull requests, code reviews, Standup, Retrospectives, SDLC. Conducted DevOps, Continuous Integration (CI), and Continuous Delivery (CI/CD) for the different environments i.e. dev, production, and dolly. Skills. Jenkins, Data processing pipelines, Pipelines, Grafana, Prometheus. Deployed and managed Microservices on Red Hat OpenShift using Kotlin, and Coroutines which simplified their management by 27% Skills: Distributed Systems, TypeScript, HBase, Kotlin, AWS. Fixed and solved Concurrency issues on legacy code using Spring Boot, and Microservices and migrated data from traditional databases to Cloud platforms.Skills: Design pattern, Kotlin, Storage Buckets, Concurrency, Multithreading, Async programming, Azure. Led the end-to-end process, including design, analysis, development, and deployment, of a high-throughput, low-latency Microservices-based subsystem within an enterprise-level distributed payment system. Skills: Maven, Git, Ansible, Terraform, Java, Spring Boot, SQL.

Successfully led the integration of multiple payment gateways, including credit cards, debit cards, and digital wallets, enhancing the platform's flexibility and providing users with diverse payment options for Duka e-commerce in Kenya. Skills: Kotlin, Kubernetes, Analytics, Security, API integrations, MongoDB NoSQL database. Implemented and maintained secure tokenization processes, improving payment data security and reducing the risk of fraud by 15%. Skills: Best practices, Security measures, Performance, Scalability, Software development workflows, J2EE, JSON, Open API. Conducted thorough testing of payment systems to identify and resolve issues, leading to a 25% decrease in payment-related customer complaints. Skills: Collaborative approach, debugging, testing, web server configurations. Full-stack Development of a robust, optimized internal reporting tool for the Kim Khan group of hospitals, leveraging application architecture, web development skills, CSS, HTML, Node.js, JavaScript, GraphQL, PHP, Unix, and Serverless GCP cloud platforms. This initiative reduced company paperwork by 38%. Analyzed logs using Elastic Search, Kibana, and Logstash. Led training sessions for the development team on best practices for secure coding and responsive design, contributing to improved coding standards and reduced vulnerabilities. Served as a technical mentor, coaching and guiding 6 junior developers. Conducted code reviews and ensured comprehensive unit testing for features.

Spearheaded the end-to-end integration of various payment gateways, overseeing the entire project lifecycle from conceptualization to implementation. Skills: Leadership, Payment gateways, SDLC, Software development, Kotlin, React.Js, HTML, CSS, SQL, Redis Cache, Memcache. Implemented SSL certificates and encryption protocols, ensuring the security of customer transactions and sensitive information. Oversaw regular security audits and implemented necessary measures, resulting in a 40% decrease in security incidents. Skills: Python, Drupal. Directed a team of developers in the creation of tools for order management, including order status tracking, shipping details, and order history, leading to a 25% improvement in order processing efficiency. Skills: Written and Verbal Communication, Collaboration, Python, Spark.

Independently developed 24 purely Java-based Desktop applications by using Swing, JavaFX, Java 11, and Java 8.Independently developed 3 web-based Java applications. I used Hibernate ORM, Spring, Spring Boot, and Rest API.Below is a complete list of tools I used: JDK (Java Development Kit) Gradle. Apache ANT™ Cucumber-JVM. JD-GUI. Hibernate. Javadoc. MySQL.Skills: Hibernate · Spring Framework · Web Development · Desktop Application Development · Responsive Web Design · Operating Systems · Java · React.js · Python (Programming Language) · C++