Ziff. · High-Performance Software Studio · Enterprise Pitch v1
Ziff
High-Performance
Software Studio
A pre-unified team of senior engineers specialized in scaling,
modernizing, and auditing complex distributed architectures.
"We aren't theoretical consultants. We are engineers who build systems that survive reality."
Confidential · For discussion purposes only david@ziff.hu ziff.hu · 2026
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The Challenge
Systems Break Under Growth
Three compounding forces stall scaling tech companies
Architecture Debt
MVP architectures and legacy monoliths hit a wall. High latency, skyrocketing cloud bills, and critical downtime become daily realities as traffic and transaction volume grow.
  • Tightly coupled services block independent scaling
  • Database bottlenecks under load spikes
  • Zero observability into failure points
Situation
The Hiring Trap
Recruiting, onboarding, and aligning a truly senior engineering team takes 6–12 months and massive financial overhead. That's if you find the right people at all.
  • Senior engineers are scarce and expensive
  • New hires need months to ramp up on existing systems
  • Mismatched expertise burns time before adding value
Complication
The Risk Multiplier
Markets move fast. Tech debt escalates faster than the business can handle. Every week of delay compounds into missed revenue, lost customers, and widening competitive gaps.
  • Velocity drops as codebase complexity grows
  • Security risks go undetected in unaudited systems
  • Engineering culture suffers under constant firefighting
Question
The Ziff Answer
A pre-unified squad of senior engineers, already synchronized and battle-tested, that plugs in with zero ramp-up and delivers immediate engineering velocity from day one.
  • 100% senior core, every role.
  • Proven at massive scale: 150K+ daily visitors
  • Three flexible engagement models
Answer
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Our Solution
Zero Onboarding Friction.
Three pillars that separate us from every other option
Pillar 01
The Pre-Unified Engine
A fully synchronized 10+ senior engineering core team with years of shared experience shipping massive enterprise systems together. We don't assemble. We deploy.
  • Established communication patterns and workflows
  • Shared architectural principles and code standards
  • Collective memory of production incidents and lessons
Pillar 02
Elite Expertise, Every Role
Every engineer brings 10+ years of battle-tested experience in high-load, high-stakes environments. 100% senior core. No account managers between you and the engineers.
  • Average 10+ years per engineer
  • Specialists in distributed systems, cloud-native, and AI tooling
  • Direct engineer-to-client collaboration
Pillar 03
Full-Spectrum Delivery
From architecture to deployment, we take complete lifecycle ownership. Access to QA and PO talent when needed. We own the outcome, not just the output.
  • Architecture design through production deployment
  • Embedded QA and Product ownership if required
  • On-demand squad scaling as projects evolve
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Capabilities
Built for Complexity
Three core service areas where we deliver transformative results
Service 01
Core & Legacy Modernization
Systematic transition from fragile monoliths into resilient, event-driven microservices, without business disruption. We've done this at scale, under pressure, with zero downtime.
  • Monolith decomposition to microservices
  • Database migration and performance tuning
  • Event-driven architecture with Apache Kafka
  • Zero-disruption migration strategies
Service 02
Tech Due Diligence & Audits
Deep-dive technical evaluations for investors, corporate leaders, and VCs. We identify code quality flaws, security risks, architecture bottlenecks, and cloud cost leaks in weeks, not months.
  • Codebase quality and architecture review
  • Security vulnerability assessment
  • Cloud cost analysis and optimization roadmap
  • M&A technical risk reports
Service 03
High-Velocity Engineering
Accelerating time-to-market for greenfield projects or injecting senior firepower into existing enterprise teams to unlock immediate capacity and momentum.
  • Greenfield product delivery end-to-end
  • Staff augmentation with senior engineers
  • AI tooling and automation integration
  • CI/CD and cloud infrastructure modernization
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Case Study · fizz.hu
Rewriting the Engine at 10,000 Feet
E-Commerce Legacy Modernization Distributed Systems Zero Downtime Migration
Challenge
Hungary's second-largest e-commerce marketplace was built on a rigid legacy MVP. As commercial growth accelerated and transaction volume exploded, the inherited monolithic architecture became a critical bottleneck.
  • Monolithic codebase unable to scale independently
  • Critical DB query times degrading under peak load
  • 150K+ daily peak visitors creating performance spikes
  • Continuous business operations could not be interrupted
Approach
The Ziff team (then the fizz.hu engineering leadership) executed a phased transformation, gradually decomposing the monolith into microservices while the platform stayed live and fully operational.
  • Strangler fig pattern for incremental decomposition
  • MongoDB → PostgreSQL migration with zero data loss
  • Apache Kafka for event-driven service communication
  • AKS deployment with GitOps and ArgoCD pipelines
Outcome
Transformed a fragile legacy platform into a modern distributed system capable of supporting massive commercial growth.
25+ Billion HUF Annual Revenue 150K+ Daily Peak Visitors Zero Business Disruption Slashed Critical Query Times Backed by Major Banking Group
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Case Study · fizz.hu · Proven Numbers
From Fragile MVP to Enterprise Scale
Every metric is a measured, real result. Not a projection.
Before · Legacy State
Architecture
Monolithic MVP
Critical DB Query Time
~30 seconds
Daily Peak Visitors
Unable to scale
Deployment Frequency
Manual, high-risk
Infrastructure
On-prem, single-point failures
Annual Revenue Supported
Constrained by bottlenecks
→
After · Modern Platform
Architecture
Event-driven Microservices
Critical DB Query Time
< 1 second
Daily Peak Visitors
150,000+
Deployment Frequency
Multiple daily (dev) · Bi-weekly (prod)
Infrastructure
AKS clusters · Multiple services · High availability
Annual Revenue Supported
25+ Billion HUF
Zero business disruption: The entire transformation was executed while the platform stayed live. No big-bang rewrite, no planned downtime, no revenue interruption.
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Deep Expertise
Legacy Systems. Modern Outcomes.
We speak the language of your existing systems. We know how to evolve them.
Enterprise Java & Spring Ecosystems
Production experience modernizing and integrating complex Spring/Java backends, BPEL/SOA-era enterprise systems, Oracle middleware stacks, and SOAP service layers into modern event-driven architectures.
Java / Spring Oracle OSB SOA / BPEL WebLogic IBM MQ
.NET & Microsoft Stack
Deep .NET Framework and C# expertise for enterprise application modernization: ASP.NET monoliths and MSSQL-heavy architectures moved to modern cloud-native services on Azure.
.NET / C# ASP.NET MS SQL Server T-SQL / PL/SQL Azure
Database Migration at Scale
Proven track record of large-scale database migrations: critical query optimization (30 sec to sub-second), MongoDB to PostgreSQL migration, and Kafka-based migration of 6M+ customer records across distributed systems.
PostgreSQL MongoDB Oracle DB Debezium CDC Kafka
High-Compliance Regulated Sectors
Experience shipping in environments where auditability, data integrity, and zero-downtime migrations are non-negotiable: banking, fintech, medical devices, telecom, and government infrastructure.
FinTech MedTech Banking Telecom Government
War Room Protocol: When production incidents hit, we don't escalate through layers. We have a proven incident command process with defined roles, escalation paths, and post-mortem culture, honed through years of high-stakes production ownership at fizz.hu.
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Technology
Production-Grade Stack
Scalable, secure, and battle-tested across real enterprise environments
Frontend & Mobile
Type-safe, performant UIs from marketing sites to complex SPAs and mobile apps. Server components, streaming SSR, and React Native builds.
React Next.js React Native TypeScript Tailwind CSS
Backend & APIs
High-throughput service layers built on typed Node.js. From low-latency Fastify APIs to structured NestJS monorepos with full OpenAPI coverage.
Node.js (TypeScript) NestJS Fastify REST GraphQL
Data & Streaming
Real-time event pipelines and durable data stores. Proven at scale: Kafka-based CDC migrations, query optimization from 30s to 500ms, and 6M+ record cross-system transfers.
PostgreSQL MongoDB Redis Apache Kafka Debezium CDC
Cloud & GitOps
Full GitOps delivery pipelines with zero manual intervention. Authored Terraform modules for 200+ service environments. CKA/CKAD certified infrastructure ownership.
AKS / Azure AWS GCP Terraform IaC ArgoCD Istio Service Mesh
Observability & Security
Full-stack observability from metrics to logs to traces. Production-hardened alerting, identity management, and DDoS-resilient edge security.
Grafana Prometheus Loki Thanos Cloudflare Azure Entra ID
AI & Automation
Practical AI integration into production workflows: LLM-powered tooling, internal automation, and AI-accelerated delivery.
LLM Integration Internal Tooling Data Processing
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Leadership
David Debreceni
Dávid Debreceni
Distributed Systems Microservices Event-Driven Architecture Cloud Infrastructure Next.js / React TypeScript Kafka Technical Leadership
"Ship systems that survive reality. Not systems that survive demos."

Founder and Lead Engineer at Ziff. 10+ years of hands-on experience building scalable, distributed systems in production environments across TypeScript, Node.js, React, Kafka, and cloud infrastructure. Started as a developer, grew into technical leadership, and never stopped writing code.

Previously Tech Lead at multiple product companies, heading cross-functional teams of 10+ engineers. Drove full-stack architectural transformations from legacy monoliths to modern microservice platforms, handling massive traffic volumes and complex data migrations without business disruption. Deep background in event-driven architecture, DevOps, and high-stakes delivery.

His philosophy: type-safe development, pragmatic modernization, and direct engineer-to-client collaboration. No layers between you and the engineers doing the work.

10+
Years
Experience
150K+
Daily Visitors
at Peak
25B+
HUF Annual
Revenue Served
10+
Production
Systems Shipped
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Core Team
Senior-Only. Pre-Unified.

A pre-synchronized team of senior specialists. No assembly required, no ramp-up time.

CA
Chief Architect
Enterprise & Solution Architecture
Transforms platforms across Finance, Telecom, and E-commerce. Designed integration architecture for massive-scale enterprise platform unifications. Managed Kafka-based migration of 6M+ customer records across distributed systems.
Enterprise Architecture Kafka Integration Design Finance / Telecom
TL
Platform Tech Lead
DevOps & Cloud Infrastructure
10+ years cloud-native experience across Azure and GCP. CKA and CKAD certified. Architected a full GitOps delivery platform from scratch for 200+ services. Authored zero-manual-intervention Terraform modules for production environments.
AKS / Azure Terraform IaC ArgoCD CKA / CKAD
+8
Extended Senior Core
Fullstack · Data · AI · QA · PO
Eight additional senior engineers covering fullstack development, data engineering, AI tooling integration, quality assurance, and product ownership. All with 8+ years of production experience. On-demand squad scaling available for full product delivery tracks.
React / Next.js Node.js AI Tooling QA · PO
Pre-unified guarantee: This team has shipped together at enterprise scale. Communication overhead, trust, and technical alignment are already established. These are not things that build over your first quarter.
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The People Behind the Code
Example Developer Profiles

Real engineers, real track records. Not placeholder bios.

15y
Principal Solutions Engineer
Enterprise Architecture · FinTech · MedTech · Telecom
"Led engineering teams of 14–15 people across MedTech, FinTech, and Telecom. As Principal Technology Consultant at Oracle, modernized enterprise Java/SOA stacks for major clients. Built a production telematics platform, migrating from Oracle legacy to event-driven microservices."
15 years · Team Lead 15+ engineers
Oracle OSB / SOA Enterprise Java Spring Node.js Kafka
8y
Senior Full Stack Engineer
Payments · Real-time Systems · SRE · Healthcare
"Built QR-code payment integration handling 100+ restaurants and 4M+ monthly transactions, designed for fault-tolerance and near-instant processing. Took SRE ownership of a video identification system under high load. Deep background across .NET legacy, healthcare simulation platforms, and real-time transaction systems."
8+ years · 4M+ monthly transactions
.NET / C# NestJS Kafka Real-time Payments SRE
7y
Senior Full Stack Engineer
Streaming Platforms · E-commerce · AI Tooling
"5+ years on a global streaming platform serving millions of users: login, registration, subscription flows at scale. Built an e-commerce webshop with complex analytics and merchant management. Actively integrates AI coding agents into delivery workflows to accelerate engineering throughput."
7+ years · Millions of global users
React / Next.js TypeScript NestJS Kafka AI Tooling
Full CVs available on request. These are three examples from a 10+ person senior core, each with a distinct background, vertical, and technical depth. The team covers legacy Java, .NET, cloud-native, payments, media, and AI tooling.
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How We Partner
Pragmatic. Transparent. Flexible.
Three engagement models designed for different stages and needs
01
Project-Based
Time & Materials
Full Product Ownership
Complete ownership of greenfield products or end-to-end legacy modernization tracks. We take full responsibility from architecture to production deployment.
  • Architecture design through deployment
  • Embedded QA and PO available
  • Transparent weekly milestones
  • Best for: new product builds, full modernization projects
02
Expert Consulting
& Day Rates
Deep-Dive Engagements
Dedicated engagement for Tech Due Diligence, infrastructure audits, or architectural blueprinting. Structured deliverables, fixed scope.
  • Tech Due Diligence for investors / VCs
  • Architecture audits with remediation roadmap
  • Cloud cost and security analysis
  • Best for: audits, M&A assessments, strategic reviews
03
Team Augmentation
Delivery Partnership
Seamless Integration
Seamless integration of individual senior engineers directly into your existing engineering department to unlock immediate capacity without reorganization.
  • 1–5 senior engineers embedded in your team
  • Direct collaboration with your existing leads
  • Flexible scaling up or down monthly
  • Best for: capacity gaps, specialist needs, sprint acceleration
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Availability
Zero Onboarding. Immediate Impact.
When and how you can engage with Ziff
Available Now
Immediate: Audits & Discovery
Strategically positioned to initiate Tech Due Diligence, Architecture Audits, or legacy codebase reviews almost immediately.
  • Tech Due Diligence engagements
  • Architecture and security audits
  • Legacy codebase assessment
  • Cloud cost analysis and optimization roadmap
  • Kickoff within days, not weeks
Q3 2026
Full Squad Capacity from Q3
Available at full scale from Q3 2026, whether as a 2-person architect strike team or a 10+ person squad for end-to-end product delivery.
  • 2-person architecture / audit teams
  • 5-person full-stack delivery squads
  • 10+ person full product teams
  • Scaling on-demand throughout engagement
  • Q3 slots are limited, early alignment recommended
The Guarantee
Pre-Unified Capability, Day One
Deeply integrated Azure/AWS, Kafka, and microservices expertise from day one. Completely bypasses the typical 3–6 month ramp-up time of newly assembled teams.
  • Shared codebase conventions and patterns
  • Established incident response playbooks
  • Common tooling and deployment pipelines
  • Zero time lost to team formation dynamics
  • 100% senior engineers, every engagement
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The Efficiency Opportunity
More Traffic. Less Infrastructure.
The real outcome isn't just scaling. It's serving more traffic with what you already have.
Serve More Traffic with the Same Infrastructure
Architectural inefficiencies often mean you're leaving 40–60% of your infrastructure capacity on the table. We identify and eliminate the bottlenecks that force you to over-provision, so existing hardware and cloud resources go further.
  • Query optimization to eliminate unnecessary load
  • Caching layers that absorb traffic spikes
  • Service decomposition for independent horizontal scaling
Result: Same infrastructure → 2–5× traffic capacity
Serve the Same Traffic with Less Infrastructure
Bloated cloud bills are often a symptom of inefficient architecture, not real traffic demand. We've reduced critical query times from 30 seconds to sub-second and right-sized over-provisioned clusters without sacrificing reliability.
  • Cloud cost audits identifying idle and over-sized resources
  • Kubernetes rightsizing and autoscaling policies
  • Database indexing, connection pooling, query rewrites
Result: Same traffic → 30–60% lower infrastructure spend
Ship Faster and Safer
Slow, risky deployments are an infrastructure problem as much as a code problem. We build the GitOps pipelines, automated testing gates, and observability layers that let your team ship confidently, multiple times per day if needed.
  • GitOps with ArgoCD: every deployment auditable and reversible
  • Zero-downtime deployment patterns
  • Observability stack: Grafana, Prometheus, Loki, Thanos
Result: From risky monthly releases → daily confident deploys
Proven: At fizz.hu we handled 150K+ daily peak visitors across multiple services at high availability, with only 1–2 platform incidents per year, none caused by infrastructure.
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Ziff
Let's Build.
Eliminate your bottlenecks with a senior, pre-unified engineering team.
No ramp-up. No account managers. Just engineers who ship.
Email
david@ziff.hu
Phone
+36 30 750 3559
Web
ziff.hu · ziff.dev
"We aren't theoretical consultants. We are engineers who build systems that survive reality."
Confidential · For discussion purposes only david@ziff.hu · info@ziff.hu © 2026 Ziff.
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