Johnny G
Software Engineer III at Ocado Technology
Barcelona, Catalonia, Spain
Summary
👤
Senior🎓
Top SchoolJohnny G is a seasoned Software Engineer III with a decade of experience building robust Java-based systems, currently focused on modularising monoliths into hexagonal, domain-driven architectures at Ocado Technology. He brings deep expertise in Spring Boot, Java 11 (OCP certified), microservices, containers, Kafka Streams and document databases (MongoDB, Dynamo), and prioritises security, TDD/BDD and clean, expressive code. His background spans high-scale payments platforms, national ETL projects and train-management training systems, giving him practical experience solving data-volume and integration complexity. Johnny pairs rigorous engineering practices (SOLID, KISS, DRY) with an eye for team scalability and faster parallel delivery through use-case driven design. Outside of work he sharpens focus and pattern recognition through chess and juggling flower sticks—small habits that inform his discipline and creativity in engineering.
10 years of coding experience
9 years of employment as a software developer
Bachelor's degree, Ciência da Computação, Bachelor's degree, Ciência da Computação at Universidade Regional de BlumenauInformatics Technician, Tecnologia da Informação, Informatics Technician, Tecnologia da Informação at Senai
English, Spanish, Portuguese
Stackoverflow
3,817reputation
2.4mreached
57answers
37questions
arraylist
top-5%
java
top-5%
Github Skills (154)
python10
testing10
data-persistence10
spring-security10
lambda10
developer-tools10
continuous-integration10
aws-lambda10
java10
serverless-framework10
spring-boot10
spring10
localstack10
aws10
logback9
Programming languages (12)
Github contributions (5)
johnnywiller/chat
Jul 2017 - Apr 2024
Contributions:5 pushes, 1 branch in 6 years 10 months
johnnywiller/hexagonal-with-usecases
Oct 2022 - Jan 2023
Contributions:1 review, 8 commits, 23 PRs in 3 months
casesuse-casesjavaarchitecturehexagonal
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