Portrait of Mihaly Kertesz

Who am I / professional profile

Mihaly Kertesz

I solve enterprise data problems where the cost of failure is high.

Portrait of Mihaly Kertesz
Base
Budapest, Hungary
Now
Passary + selected high-impact SQL Server work
Availability
Booking roughly 2 weeks out
Language
Hungarian - native / English - full professional proficiency
Timezone
Budapest / strong fit for Europe-UK, useful overnight overlap for US
20+ years in enterprise databases and infrastructurebanking, logistics, and large enterprise environmentsmulti-platform certified: Oracle, IBM, Red Hatsecurity, HA, backup/recovery, tuning, product, SEO

Summary

I solve enterprise data problems where failure is expensive. The main ground has been banking, logistics, and other larger environments where bad changes, weak recovery, or unstable systems have financial and operational consequences.

I am multi-platform certified across Oracle, IBM, and Red Hat, which is part of why the systems mindset here is broader than a single database engine. I care about the full operational picture, not just one tuning trick.

Building Passary is not a side quest away from database work. It is proof of the same bias toward security, ownership, architecture, and risk control that I bring into enterprise environments.

I keep consulting deliberately narrow. I take on a limited number of active SQL Server engagements at a time so the senior judgment I am selling is actually focused on the client environment, not spread across a dozen tickets.

On the database side, the strongest public reference page right now is the SQL Server updates tracker, which reflects the operational side of the work more directly than a normal profile page can.

Focus areas

Databases and operations

High availability, backup and recovery, performance tuning, operational discipline, resilient systems.

Security and ownership

Encryption, minimal attack surface, local data ownership, and a zero-cloud mindset where it makes sense.

Product and strategy

Passary product direction, zero-trust thinking, ownership-first architecture, and practical product decisions shaped by operational risk.

SEO and web

Technical SEO, content and site building through BPSEO, plus web projects when needed.

Experience

Roles, projects, and direction

Passary

Founder

Building and steering an offline password manager. The work uses the same paranoia and precision I bring to enterprise databases: zero-trust architecture, high-availability data ownership, and operational stability.

Transcom

Database Engineer / Specialized Engineering Project

A short but intense enterprise database role where stability and operable solutions mattered most.

BPSEO

Strategic Advisory & Independent Engineering

Independent technical work across SEO, websites, and content systems. Useful here because it sharpened the product, risk, and commercial side of technical decision-making instead of pulling me away from infrastructure thinking.

KBC Global Services

Senior Database Engineer / Specialized Engineering Project

Enterprise database work, operations, and reliability in a banking environment.

Hellmann Worldwide Logistics

Database Engineer

Database work for logistics systems, with a focus on performance, stability, and failure handling.

Unisys

Senior Database Engineer

A longer enterprise database period with a strong focus on operations and reliability.

Oracle

Database Engineer

Oracle-heavy work, operations, performance, and a practical systems mindset.

Earlier roles

DBA / system-level operations

This is where the foundation came together: database administration, support, enterprise processes, discipline, and plenty of situations that never make it into a job description.