L O A D I N G

Developer Portfolio

I’m Zaćk Løuiš – Software Engineer

I Build with Code, Shape with Logic, and Think in Systems.

Developer. System Architect. Technical Storyteller. Passionate about meaningful engineering that scales.

View My Work
Let’s Build Together

Who I Am,
Beyond the Stack

I’m Zaćk Løuiš
Software Engineer

I’m not just a developer. I’m someone who obsesses over the why as much as the how. I don’t chase frameworks—I pursue clarity, performance, and sustainable code.

My work sits at the intersection of software craftsmanship and real-world problem solving. Whether it’s architecting modular frontends, streamlining backends, or automating away chaos, I build with an eye for design, resilience, and the humans who use what I create. I believe that good developers don’t just ship fast—they ship smart.

Know About Me
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Selected Work That
Speaks for Itself

Modular CMS for Scalable Newsrooms

Problem:

Traditional CMS platforms were bloated and inflexible, leading to bottlenecks in high-frequency publishing workflows.

Solution:

Architected a fully decoupled, headless CMS using Next.js and GraphQL, with custom content schemas and dynamic rendering logic. Integrated editorial automation tools to cut publishing time by 65%.

Tech Stack:

Next.js, GraphQL, MongoDB, Tailwind, Vercel, Node.js

Impact:

• 3× faster time-to-publish
• Zero outages in 18 months
• 100% editorial adoption

Live Demo Case Study GitHub Repo

Event Tracking Architecture for SaaS Workflow Engines

Problem:

The off-the-shelf analytics platforms (Google Analytics, Mixpanel) failed to track domain-specific metrics such as workflow churn,...

Solution:

Built a bespoke event tracking system using event sourcing principles. Designed an analytics pipeline with Kafka + MongoDB for ingestion, and a React dashboard with D3 visualizations for ...

Tech Stack:

React, Node.js, Kafka, MongoDB, D3.js, Auth0, Docker

Impact:

• Enabled 100% visibility into customer behavior within workflows
• Led to a 41% reduction in onboarding churn after UX tweaks
• Decreased dependency on engineering for analytics by ...

Live Demo Case Study GitHub Repo

Dynamic Pricing Engine for E-commerce Intelligence

Problem:

E-commerce brands struggled with static pricing strategies, leading to lost sales during competitive pricing shifts and seasonal...

Solution:

Designed and deployed a real-time pricing engine using Python and Redis with support for asynchronous rule-based evaluations. Integrated competitor scraping, product segmentation, and ...

Tech Stack:

Python, FastAPI, Redis, PostgreSQL, Puppeteer (Node.js), AWS ...

Impact:

• Increased revenue by 23% within 3 months
• Reduced pricing update latency from hours to <30 seconds
• Enabled autonomous pricing decisions across 12 product categories

Live Demo Case Study GitHub Repo
Browse All Works

Tools I Know.
Patterns I Master.

Languages

  • JavaScript/TypeScript — My go-to for frontend and backend
  • Python — Automations, data wrangling, and scripting
  • Go — When performance and concurrency matter

Frameworks & Libraries

Systems & DevOps

Testing & Quality

  • JavaScript/TypeScript — My go-to for frontend and backend
  • Python — Automations, data wrangling, and scripting
  • Go — When performance and concurrency matter

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