Scaling Complex Backends & Rescuing Vibe-Coded MVPs.
Whether your legacy system is cracking under traffic spikes or your fast AI-generated MVP is falling apart, I fix the core. With 15 years of backend engineering experience, I rebuild your technical foundation for scale, speed, and absolute stability.
By the numbers
02 - The Problem
Your system was built fast. But can it scale?
Whether you're dealing with years of accumulated tech debt or the fragile architecture of an AI-assisted MVP, the symptoms are the same. Once real users arrive, the cracks start to show.
Your database queries are taking seconds, not milliseconds.
API integrations randomly drop out or duplicate data.
Adding one simple feature breaks three existing ones.
Your team spends hours manually fixing data in Excel because the internal systems don't talk to each other.
This isn't a simple bug. It's the cost of rapid deployment without a solid architectural strategy. I fix the core.
03 - The Services
How I Stabilize Your Business
The MVP Rescue Audit
Before writing a single line of code, we need a diagnosis. I will dive deep into your codebase, database structure, and cloud architecture. You receive a comprehensive teardown document highlighting critical security flaws, performance bottlenecks, and a step-by-step roadmap to fix them.
Investment: Starting at €2,000
Backend & API Stabilization
I take over the most critical parts of your infrastructure. I rewrite inefficient database queries, secure your API endpoints, and restructure your backend logic so your platform can handle 10x the traffic without sweating.
Investment: Custom quote based on project scope
Business Automation & Internal Tools
Stop running your tech company on manual Excel sheets. I architect custom integrations that connect your CRM, accounting, and operational software into one seamless, automated flow. We eliminate manual data entry so your team can focus on growth.
Investment: Custom quote based on ROI
04 - The Architect
15 Years in the Engineering Trenches.
My name is David Tacer. I don't build WordPress templates, and I don't argue over button colors. I am an Architect focused purely on backend performance, systemic logic, and business automation.
To be clear: I am not anti-AI. I use AI coding agents daily to accelerate development. But AI is a tool, not an architect. The difference between a fragile vibe-coded mess and a scalable enterprise system isn't the AI—it's the 15 years of engineering experience steering it.
I am also the founder of DataVallis, a specialized firm building secure, high-stakes blockchain solutions. Architecting trustless, distributed networks has fundamentally shaped my uncompromising approach to backend reliability.
For the past 15 years, I have been building, migrating, and stabilizing complex systems. When things get heavily technical and your product's survival depends on it, you need an adult in the room.
06 - Selected Work
Proven in the field.
A few engagements and projects that shaped how I build secure, fault-tolerant backend systems.
PCCW Global
Hong Kong · Telecom (PCCW Group have 20,000+ employees)
Blockchain integration into a telecom backbone
Worked on-site in Hong Kong with a Chinese engineering team to integrate blockchain technology into PCCW Global's telecommunication system. Designing distributed ledgers for a 20,000+ employee corporation taught me how to architect backends where failure is not an option.
WEF Davos · Hackathon 2018
Switzerland · World Economic Forum side event
Hackathon Winner - Most Inspirational Project
Won the hackathon hosted as a side event of the World Economic Forum in Davos. The project was also named Most Inspirational Project in Slovenia and later recognized by UNECE / CEFACT as a Use Case contributing to the United Nations Sustainable Development Goals (SDGs).
Speaking & Podcasts
Public speaking · Tech Architecture
From faculty talks to podcast appearances
Guest on Start:up Müsli and the podcast 'Bringing Decentralized Storage to the Masses'. Also spoke at the Faculty of Economics and Business on the intersection of complex tech architecture and business value.
Founder & Lead Architect
Enterprise Blockchain Solutions
DataVallis
As the founder of DataVallis (datavallis.com), I lead the architecture of advanced Web3 and blockchain integrations. Building decentralized infrastructure requires absolute precision and zero-downtime tolerance - principles I apply to every standard SaaS and enterprise backend I rescue.
05 - Next Step
Stop losing sleep over server crashes.
Let's figure out exactly what is holding your product back. Schedule a brief, no-nonsense discovery call. No sales pitch, just a technical conversation about your current bottlenecks.