Available for opportunities

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.

5+Years Experience
🛡️Security Champion
🏗️Architecture Driven
View Experience Get in Touch
Zsolt Kalman
Node.js
.NET
🛡️ Security
NestJS
Clean Architecture
TDD
DDD
Career Journey

Professional Experience

Instructure

Senior Software Engineer Sep 2024 - Present · Remote

Driving backend architecture and scalability for EdTech learning tools. Led NoSQL to PostgreSQL migration and implemented Hexagonal Architecture.

  • 🏗️ Architectural Overhaul: Redesigned backend using Ports and Adapters pattern
  • ⚡ High-Performance: Built Redis-backed BullMQ job queue (30s → sub-second)
  • 🔒 Security: Multi-region LTI routing, fixed critical data isolation issues
Node.jsNestJSPostgreSQLRedisKubernetes

Taxually

Senior Software Engineer Aug 2024 - Sep 2024

Contributed to cutting-edge tax automation platform during intensive project engagement.

.NET CoreMicroservices

Asura Technologies Ltd.

Senior Software Engineer Dec 2023 - Aug 2024 · Hybrid

Developed intelligent traffic solutions deployed primarily across the United States.

Backend DevelopmentIoTTraffic Systems
Security Champion

LogMeIn (LastPass)

Senior Software Engineer Dec 2020 - Nov 2023 · 3 years

Core member of LastPass team, developing complex administrative systems for the world's leading password manager.

  • 🛡️ Security Champion: Led vulnerability identification and remediation
  • ⚙️ Backend Services: C#, .NET Core, ASP.NET Core with high availability
  • 🔧 DevOps: JetBrains Rider, GitKraken, AWS workflows
C#.NET CoreASP.NET CoreAWSSecurity

Spark Consulting

Full Stack Engineer Sep 2019 - Dec 2020

Delivered end-to-end solutions for multiple greenfield projects, from planning to deployment.

BlazorAngular.NET CoreAzure DevOps
Expertise

Technical Skills

⚡

Backend

Node.js
NestJS
C# / .NET Core
ASP.NET Core
🗄️

Databases

PostgreSQL
Redis
MongoDB
Prisma ORM
🏗️

Architecture

Microservices
Hexagonal Architecture
Event-Driven
API Design
☁️

DevOps

Kubernetes
Docker
AWS
Terraform / Helm
🛡️

Security

Security Best Practices
Vulnerability Assessment
Data Isolation
OAuth/LTI Auth
🎨

Frontend & Tools

React / TypeScript
Angular / Blazor
Git / GitHub
Sentry / Monitoring
How I Work

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

Side Projects

Personal Projects

MediaMerit

A personal project showcasing full-stack development capabilities with modern web technologies.

Full-StackWeb Development
Background

Education

🎓

Budapest University of Technology and Economics

Bachelor's Degree in Computer Science

2017 - 2021

Get in Touch

Let's Work Together

LinkedIn Profile GitHub

Based in Budapest, Hungary 🇭🇺

Open to remote opportunities worldwide