Product interfaces and full-stack foundations
Early product work ranged from customer-facing websites to a real-estate management system built with React and TypeScript, supported by a Node.js API and MongoDB data layer.
Principal engineer / Direct accountability
Marc Lupanciuc
I’m a senior full-stack AI-native software engineer with more than ten years of experience turning product ideas and difficult technical requirements into working production systems.
01 / Working philosophy
The tools move quickly. Accountability should not disappear.
AI has changed how much engineering work can happen in parallel. It has not removed the need to understand the problem, choose an architecture, recognize risk, review the result, or take responsibility when the software meets production.
My role is to connect business intent to technical execution. Clients stay close to the decisions and the evolving product without having to coordinate a collection of tools, agents, and specialists themselves.
02 / Engineering arc
Built across the stack, learned in production.
The useful part of experience is not the number of technologies. It is recognizing which decisions will matter later.
Real-time and operational software
I helped migrate a telemedicine video experience from a legacy embedded application into React, working with WebRTC, Jitsi, state management, code review, and interaction details such as automatic picture-in-picture.
Complex platforms and engineering decisions
My work expanded into large operational applications, performance investigation, architecture contribution, automated testing, technical coordination, and systems that carry substantial user and business data.
AI-native full-stack product engineering
Today I work across React and Next.js, Go, Node.js, .NET, databases, distributed services, cloud delivery, AI integrations, agentic workflows, and MCP-based systems.
03 / Selected product work
These are two projects I can discuss publicly. Much of my other client and product work remains private because of confidentiality, ownership, or commercial constraints.
Commercial platform / Principal implementation
OutThink
A content-led cybersecurity marketing platform built end to end with Next.js and Sanity, designed to give the company a scalable foundation for publishing, campaigns, and demand generation.
A website built as a growth system.
I built and evolved the production website across the application, component system, Sanity content architecture, dynamic resource and campaign pages, forms, analytics integrations, SEO, and delivery workflows.
The platform contributed to company revenue growth as part of a broader effort across marketing, product, sales, and the wider OutThink team.
Visit OutThinkThe public website has since been redesigned. This case study refers to the production platform I originally built and developed.
01Content systemSanity-powered pages, resources, podcasts, news, and editorial workflows
02Conversion platformCampaign, industry, and tailored landing pages with forms and calls to action
03Growth foundationsSearch visibility, structured metadata, analytics, tracking, and site maps
04Production deliveryReusable Next.js components, deployment workflows, maintenance, and QA
Open-source / Part-time product engineering
Globe & Citizen
A publishing and community platform combining news, contributor viewpoints, reader interaction, and a deeper set of research and market-intelligence tools for registered users.
A public product, not a portfolio exercise.
My work spans the product interface and backend system: editorial workflows, article and opinion experiences, authentication, user profiles, community interaction, market-data integrations, alerts, analytics, and production observability.
Beyond the public publishing experience, registered users can access more complex product tools for following markets, configuring alerts, comparing information, and developing prediction-based research.
The product combines a Vue and TypeScript application with a Go API, persistent data, caching, external services, telemetry, and deployment concerns. It is an evolving system with real product and architectural constraints.
Visit Globe & Citizen01PublishingNews, long-form articles, contributor opinions, administration
02CommunityProfiles, comments, voting, following, reader insights
03Market intelligencePrediction markets, alerts, comparisons, and analysis workflows
04Production systemGo services, data, cache, integrations, telemetry, and delivery
Direct collaboration with the engineer responsible
Let’s make the first decision useful.
Share the product, the business outcome, and what is still unclear. I’ll respond directly.
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