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Tomáš Zálešák

Tomáš Zálešák

Senior software engineer based in the EU (CET).

Open to new projects — feel free to reach out
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What I do

I'm a senior full-stack engineer specializing in enterprise-grade software — designed for scalability, security, and stability from day one. I build complete products end to end, from backend architecture and databases to polished frontends and the pipelines that ship them. I've tried many languages and technologies over the years, and my passion is choosing the right one for the problem at hand.

How I work

CI/CD automation

Builds, tests, and deployments run automatically across every environment — releases become a non-event.

Scalability

Architecture that is ready to grow from day one and adapts as your needs evolve.

Security

Threat analysis is part of planning, not an afterthought. Vulnerabilities are assessed and prevented within the CVSS v3 framework.

Team management

Agile delivery in 14-day sprints with all the ceremonies — predictable progress and smooth collaboration.

Tech stack and what I can build for you

Backend.NET, C#, Entity Framework Core, SQL, Python 3
FrontendReact, Vue, Solid.js, Bobril.js, TypeScript, Tailwind CSS
ArchitectureMicroservice architecture, message queues, domain-driven design, vertical slices
Cloud & DevOpsAzure, AWS, Docker, GitHub Actions, Atlassian Bamboo, Azure DevOps — deployment, scaling, monitoring, logging
DatabasesPostgreSQL, Microsoft SQL Server, NoSQL databases
SecuritySecDevOps, automated vulnerability scanning with OpenVAS
AI & toolingAI models and AI coding tools (Claude Code, Codex, OpenCode); monorepos with Nx and Turborepo
Web applications.NET backend — ASP.NET Core with MVC, Razor Pages, or Blazor · JavaScript frontend · SLA-backed maintenance and support
Distributed systemsMicroservices orchestrated with Kubernetes and Docker · Cloud-native deployments on Azure Kubernetes Service (AKS) · Built for high availability and horizontal scaling
Data analysisData processing and normalization · Report definition and implementation · Automated reporting with Python · Clear data presentation and actionable insights

Work Experience

Senior Software Engineer

2021–now

Independent senior engineer delivering full-stack solutions for multiple clients — from greenfield microservice platforms to warehouse-logistics systems — covering architecture, domain-driven design, cloud, and CI/CD.

  • Quadient (opens in new tab)

    Long-term engagement on Quadient's cloud e-invoicing platform: building and operating many microservices and the team's custom microservice infrastructure, designing React.js frontends and .NET backends, and driving greenfield projects from design to production. Day-to-day work spans scaling, unit/integration/e2e testing, observability with Grafana and Loki, code reviews, and AI-assisted development with Claude Code.

    • .NET
    • React.js
    • Bobril.js
    • Python 3
    • PostgreSQL
    • NoSQL
    • Azure
    • Docker
    • Kubernetes
    • Grafana
    • Claude Code

  • Notino (opens in new tab)

    Designed a new solution for managing consumables across all of Notino's European warehouses — a .NET and Microsoft SQL Server backend built around domain-driven design, events, and vertical slices, with a React.js frontend. Mentored less senior engineers through code reviews and established repository collaboration rules and code style guidelines.

    • .NET
    • Microsoft SQL Server
    • React.js
    • Domain-Driven Design
    • Vertical Slices

  • Disruptive Lab (opens in new tab)

    Full-stack development and consulting: software architecture and domain-driven design, primarily in .NET, React.js, Bobril.js, TypeScript, and SQL, with cloud deployment and CI/CD.

    • .NET
    • React.js
    • Bobril.js
    • TypeScript
    • SQL
    • Cloud
    • CI/CD

  • RHBcare (opens in new tab)

    Built and run the clinic's web application in Next.js — web design, SEO, data and customer management, and process automation — alongside administering Linux and Windows servers, databases, automated backups, and networking.

    • Next.js
    • SEO
    • Linux
    • Windows Server
    • Networking

  • Y Soft (opens in new tab)

    Consulting on the automated security-scanning solution I originally designed and built — vulnerability detection with OpenVAS orchestrated through Atlassian Bamboo.

    • OpenVAS
    • Atlassian Bamboo
    • Security Automation

Software Engineer

2019–2021

Designed and fully automated dynamic application-security analysis: OpenVAS/Greenbone vulnerability scanning orchestrated by Atlassian Bamboo across a three-VM VirtualBox infrastructure, automatically detecting new vulnerabilities and suppressing false positives. Continuously validated against Ubuntu 18.04 running Rocket.Chat; a similar solution was deployed internally at Y Soft. Worked with Linux and Windows administration, React, .NET Core, Java, Python, Bash, and PowerShell.

Software Engineer Intern

2017–2018

Worked in a team developing Microsoft Dynamics 365 Business Central, building new custom modules for client companies and automating localization into Czech and English. Used Python 3, .NET, TypeScript, JavaScript, Microsoft SQL Server, PowerShell, and Bash.

Education

Software Systems Development and Management

MUNI FI (opens in new tab)· Mgr.
2020–2022

Information Technology

BUT FIT (opens in new tab)· Bc.
2016–2020

Hobbies

Apart from IT, I love sports, especially basketball which I play for BK TJ Spartak Uherský Brod (opens in new tab).