Hello, I'mZsolt Kalman
Senior Software Engineer
Backend & Full-Stack specialist with 5+ years experience building scalable, secure solutions. Expert in Node.js, NestJS, .NET Core, and Microservices. Passionate Security Champion.
Professional Experience
Instructure
Senior Software Engineer Sep 2024 - Present · RemoteDriving backend architecture and scalability for Instructure's Portfolio tool. Led the transition from MongoDB to PostgreSQL and implemented Hexagonal Architecture.
- System Architecture: Redesigned the backend to use Ports and Adapters, enabling a seamless database swap and faster feature development
- Scalability: Built a Redis-backed job queue (BullMQ) that cut heavy processing tasks from 30s to sub-second async acknowledgments
- Security & Scale: Engineered multi-region LTI routing for data residency compliance and fixed critical data isolation vulnerabilities
Taxually
Senior Software Engineer Aug 2024 - Sep 2024Contributed to cutting-edge tax automation platform during intensive project engagement.
Asura Technologies Ltd.
Senior Software Engineer Dec 2023 - Aug 2024 · HybridDeveloped intelligent traffic solutions deployed primarily across the United States.
LogMeIn (LastPass)
Senior Software Engineer Dec 2020 - Nov 2023 · 3 yearsCore member of LastPass team, developing complex administrative systems for the world's leading password manager.
- Security Champion: Acted as the strategic bridge between IT Security and Engineering, facilitating vulnerability reviews and remediation
- DevOps Efficiency: Optimized CI/CD pipelines, reducing build & deployment times from 1.5 hours to 20 minutes
- High Availability: Developed resilient .NET Core administrative systems supporting the world's leading password manager
Spark Consulting
Full Stack Engineer Sep 2019 - Dec 2020 · Part-timeDelivered end-to-end solutions for multiple greenfield projects, from planning to deployment.
Avatao
Content Developer Apr 2018 - Aug 2019 · Part-timeCreated high-quality hands-on technical tutorials for a cybersecurity training platform.
- Security Education: Developed engaging content for Node.js and .NET learning paths focusing on secure coding practices
- Infrastructure: Utilized Docker to create containerized environments and Python 3 for automation
BotCool
NodeJS Developer Intern May 2017 - Sep 2017 · Part-timeGained foundational professional experience building chatbots for Facebook Messenger using Node.js and Azure.
Technical Skills
Backend
Databases & ORMs
Architecture
DevOps
Security
AI & Applied LLMs
Frontend & Tools
Engineering Philosophy
Security-First Mindset
Served as Security Champion at LastPass, integrating security practices into every stage of development
Test-Driven Quality
Comprehensive testing and idempotency guarantees ensure reliable, predictable systems
Clean Architecture
Hexagonal Architecture adoption enabled seamless database migrations without touching business logic
Documentation & Clarity
RFCs, architectural decision records, and clear code comments for maintainable codebases
Performance-Conscious
Proactive optimization through caching strategies, query analysis, and async processing
Collaborative Approach
Code reviews focused on mentoring, knowledge sharing, and building team capabilities
Technology Finder
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Education
Budapest University of Technology and Economics
Bachelor's Degree in Computer Science
2017 - 2021
Let's Work Together
Based in Budapest, Hungary
Open to remote opportunities worldwide