Vasilis (VK) K.
Senior Software Engineer/Architect
Experience
May 2023 - Dec 2025
2 years 8 monthsAthens, Greece
Senior Software Engineer/Architect
IKnowHow
- Architected enterprise web solutions with Spring Boot/Spring Cloud microservices, improving scalability by 45%, and achieving 99.95% uptime.
- Developed secure OAuth2/JWT REST APIs, serving 50,000+ daily requests, with zero security breaches.
- Led architectural reviews and championed TDD, improving code quality by 40%, achieving 85% test coverage, and reducing incidents by 60%.
Feb 2022 - Feb 2023
1 year 1 monthAthens, Greece
Senior iOS Developer
Silvare Consulting / Accenture
- Delivered a mission-critical iOS banking app for Alpha Bank, serving over 100,000 users with secure, high-performance solutions.
- Built enterprise-grade Swift applications using MVVM and Clean Architecture, implementing biometric authentication, end-to-end encryption, and offline-first data sync.
- optimized performance with Combine and memory management, achieving 40% faster load times, a 99.9% crash-free rate, and accelerated releases via Fastlane/Jenkins CI/CD pipelines.
Dec 2018 - Jan 2022
3 years 2 monthsVrilissia, Greece
Senior Mobile and Java Developer
Toorbee
- Architected cross-platform mobile apps and microservices infrastructure, establishing DevOps and containerization practices that improved deployment efficiency.
- Designed scalable Spring Boot/Spring Cloud microservices with Netflix OSS, implementing circuit breakers, load balancing, and distributed configuration, and built cloud-native solutions on AWS/Azure using Docker and Kubernetes, reducing infrastructure costs by 30%.
- Implemented CI/CD pipelines with Jenkins and GitLab CI, automated testing, blue-green deployments, and developed native Android/iOS apps with optimized database performance (Redis caching, indexing), mentoring junior developers on best practices.
Jan 2017 - Dec 2018
2 yearsAthens, Greece
Senior Mobile Developer
- Delivered end-to-end mobile solutions across retail, healthcare, and logistics, managing full project lifecycles from requirements to deployment.
- Architected and launched 12+ Android and iOS apps using MVP/MVVM, scalable codebases, and modern mobile architecture patterns.
- Provided mobile strategy and API architecture consulting, collaborating with backend teams, managing client relationships, and achieving 100% on-time, on-budget delivery.
Nov 2013 - Jan 2017
3 years 3 monthsAthens, Greece
Senior Mobile and Web Developer
Novomatix P.C.
- Developed mobile and web solutions with offline synchronization, real-time updates, and cross-platform data consistency.
- Architected native Android (Java) and iOS (Objective-C/Swift) apps with an offline-first design (SQLite) and bi-directional sync, integrating RESTful APIs and push notifications (FCM, APNs).
- Built dynamic PHP/MySQL web applications with MVC architecture, responsive dashboards, and optimized performance via profiling, refactoring, and caching, improving response times by 45%.
Oct 2011 - Nov 2013
2 years 2 monthsNea Ionia, Greece
Mobile and Java Developer
APLOON LTD
- Developed native iOS applications and enterprise web solutions, supporting agile processes, and establishing quality standards.
- Built native iPhone apps using Objective-C, focusing on intuitive UI/UX, smooth animations, and optimized performance across iOS versions.
- Developed enterprise web applications in Java with Apache Wicket, implementing a component-based MVC architecture, and contributed to architecture, code reviews, and sprint planning.
Summary
Distinguished Software Architect with 20 years of proven excellence in designing and implementing enterprise-scale solutions across mobile, web, and cloud platforms.
Specialized in transforming complex business requirements into robust, scalable architectures using microservices patterns, domain-driven design, and modern DevOps practices.
Expert in leading technical strategy, mentoring development teams, and delivering high-performance systems that drive business value, while maintaining exceptional code quality and security standards.
Languages
Greek
NativeEnglish
AdvancedEducation
University of Piraeus
Master of Science · Electronic Learning · Piraeus, Greece
University of Piraeus
Bachelor of Science · Educational Technology and Digital Systems · Piraeus, Greece
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