Principal Software Engineer · Infra / DevOps Lead
Currently @ MASTERREMIT · Victoria, Australia
I build systems that scale, and bills that don't.
Principal software engineer and Infra / DevOps lead, ten years deep. I cut infrastructure costs by 73%, ship platforms that hold 100M+ records, and lead delivery end-to-end, from multi-account AWS and Terraform to the Laravel, Symfony, and NestJS services running on top. On my current fintech build I'm folding in AI agents and automation flows where they earn it. Measured by what ships: lower bills, faster APIs, systems that hold under load. Off the clock, I build games.
Based in Australia · Collaborating globally · Delivered across 3+ countries
Trusted by teams behind
Selected work
1 / 4Senior Full Stack Engineer
The backends behind physical, branded interactive installations like arcade cabinets, AR experiences and live activations for Asahi, Westfield (Vivid), LG and Coles. Real-time WebSockets, Laravel/Python APIs, and AWS pipelines holding tens of thousands of players per campaign.
50,000+ daily users / campaign
1 / 2Co-Founder & Senior Full Stack Engineer
A modern breathwork analytics platform, real-time session tracking, breath-pattern visualization, and progress reporting. Built and shipped from zero, to 100+ users in three months.
100+ users in first 3 months
Visit ↗
1 / 2Full Stack Tech Lead
A full-featured CMS and e-commerce platform built from scratch for an antique retailer, leading a team of three. 5,000+ products, 99.9% uptime over two years.
10,000+ monthly active users
1 / 2Architecture & Cloud Infrastructure
An all-in-one marketing platform built on microservices, AI-assisted brand assets, templates, and growth tooling, served from a containerised AWS backend designed to scale without ballooning the bill.
Microservices · AWS
Solo Developer, code, art & design
A 3D tower-defense roguelite I'm building solo in Unity 6. You're a mad bakery baker holding the line as pastries and food go rogue, modular towers, a roguelite run loop, and quirky, colourful low-poly art. Everything ships from my hands: gameplay, C#, and the 3D art. AI only writes the music and plays rubber duck, never the code.
Solo-built in Unity 6
Deep dives
Re-architected a fragile single-account AWS setup into isolated, IaC-managed environments, security up, bill down 73%.
Built the e-commerce microservices backend behind 5M+ monthly users, PCI DSS compliant, zero breaches.
Scaled an asset-rendering platform to 100M+ records, lifted render performance 40%, and cut EC2 spend 20%.
Experience
MASTERREMIT · Contract
DESYGNER · Full-Time
ZEBRAR · Contract
CURRYS · Full-Time
ADDMENTION · Full-Time
ZEUS SOLUTIONS · Full-Time
DATAVIEW · Full-Time
ETRIM · Full-Time
Stack
FAQ
Mario Sokolovsky is a principal software engineer and infrastructure / DevOps lead based in Victoria, Australia, with over ten years of experience building cloud-native SaaS, e-commerce, and interactive-media systems across Australia and Europe.
End-to-end delivery of scalable backend and cloud systems: AWS (EC2, EKS, ECS, Lambda), Terraform and Kubernetes infrastructure, and application code in PHP (Laravel, Symfony), Vue.js, and NestJS. He also integrates AI agents and automation flows into delivery pipelines.
He has cut infrastructure costs by 73% (AUD 4.5k to 1.2k/month), architected platforms holding 100M+ digital records, trimmed AWS spend by around 20%, and built e-commerce backends serving 5M+ monthly active users with PCI DSS compliance and zero breaches.
Yes. Mario is available for select work. He is based in Australia, collaborates globally, and has delivered projects across more than three countries. The fastest way to reach him is by email at mario.sokolovsky@gmail.com.
Breadlines is a 3D tower-defense roguelite that Mario is building solo in Unity 6 and C#. You play a mad bakery baker holding back waves of rogue pastries and food, with modular towers and colourful low-poly art. Mario makes all of the code, 3D art, and design himself.
Rates
Starting point for freelance and contract work. The exact rate depends on scope, length, and stack. Backend, cloud/DevOps, and architecture sit at the higher end. Reach out and we'll figure out what fits.
Contact