Software Development Engineer III · ASSIST Software
I turn complex problems into web products that feel effortless.
A full-stack engineer working across TypeScript, React, Next.js, GraphQL and Node.js — equally at home shaping an interface or the systems running behind it.
About Me
I'm Constantin — a software engineer based in Romania who genuinely enjoys the craft of building things well. I've spent the last several years at ASSIST Software shipping front-end and full-stack work for products that real people depend on.
I care about clarity over cleverness: code the next person can read, interfaces that don't make people think, systems that fail gracefully. I'd rather delete a hundred lines than add ten nobody understands. Performance, accessibility and sensible defaults aren't things I bolt on at the end — they're where I start.
“Good engineering is quiet. It just works — and the people using it never have to think about it.”
Away from the editor I'm curious by default — I like taking things apart to understand why they work, whether that's a payment flow, a streaming pipeline or a framework I've never touched. I'm at my best on a team that takes the work seriously without taking itself too seriously, and I always try to leave a codebase a little better than I found it.
Tech I Reach For
The tools I build with — chosen for what they do well, not for novelty.
Frontend
API & Backend
Data
Quality & Infra
Selected Work
A few projects where I turned a real problem into something people can use. Tap a card to read how it came together.
MediCare — Unified Digital Health Platform
Patient data lived scattered across systems, forcing clinicians to rebuild the full picture from a dozen tabs.
Activity Recorder & Tracker
Parents needed a reliable way to keep an eye on their child's Android device — screenshots and activity logs — without having to touch the phone every day.
Planning Estimation Tool
Remote teams needed a fast, fair way to estimate work without talking over one another.
Booking System (Laravel)
A manual reservation process that was slow to manage and easy to double-book.
Headless Livestreaming Server
Broadcasting from multiple sources usually means heavy, GUI-bound tooling that resists automation.
My Experience
ASSIST Software
Apr 2021 — PresentSoftware Development Engineer III
Leading front-end architecture for multi-tenant, high-performance web applications across multiple markets — with a consistent focus on SSR, scalability, and clean cross-functional collaboration.
- Led frontend architecture for Wella's universal checkout platform — Next.js App Router + SSR, TanStack Query, Zod validation, and Tailwind multi-brand theming serving all Wella brand sites.
- Optimized GraphQL queries and Apollo Client caching, cutting infrastructure costs by 50% and improving Lighthouse scores by up to 35%.
- Redesigned payment architecture from Adyen Hosted Pages to Drop-in Advanced Flow; integrated Contentful CMS and serverless APIs for license verification, webhooks, and live chat.
- Mentored junior engineers, led code reviews, and collaborated cross-functionally to align technical solutions with product goals.
Syndika
Aug 2024 — Oct 2024Front-End Developer (Freelance)
Short engagement building the Tea-Fi presale and admin panel for a crypto application with real-time token vesting.
- Integrated smart contracts via wagmi and viem for token claiming and vesting mechanics.
- Delivered real-time vesting data through GraphQL + Subgraph; optimized data fetching with SWR.
- Built companion React Native screens for mobile access to the presale and vesting dashboard.
My Certifications
A commitment to continuous learning, on paper.
Microsoft Certified: Azure AI Fundamentals
Foundational AI concepts and how they map to building software and services on Microsoft Azure.
Cambridge English: First (FCE)
Demonstrated ability to use everyday written and spoken English confidently in work and study settings.
Let's Talk
Hiring, freelance, or just comparing notes on a hard problem — I'd be glad to hear from you.
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