Product Manager · Designer · Builder
Sebastian Voinea
I turn ambiguous, real-world problems into shipped products, from user research and roadmapping to the UX and code behind them when it counts
Get in touch →
Copenhagen, DK · Available now
Product Manager & Full-Stack Developer
Own the product for a live theater management platform, partnering directly with staff across departments, box office, administration, artistic, to turn real workflows into shipped features. Cover discovery, roadmapping, and UX myself, and build the product myself too when that's the fastest path to shipping.
Shipped payroll computation, budget tracking, grant reporting, expense and invoice management, and a bank integration for automated batch payments, cutting roughly a full day of manual admin work per week and improving data accuracy across the board.
Teaching Assistant — X-Tech Entrepreneurship
Supported DTU's flagship startup incubator course, mentoring early-stage teams on pitching, product design, business models, and go-to-market strategy, and giving structured feedback that helped several ideas turn into real ventures.
Assistant Product Manager & Scrum Master
Managed product backlogs and refined user stories, kept development aligned with measurable business goals, and introduced estimation techniques and agile ceremonies that improved sprint predictability. Acted as the day-to-day bridge between stakeholders and engineering, reducing misalignment and rework.
A wide toolkit, deeply used.
Product
- Product roadmapping
- User research & discovery
- Prioritisation frameworks
- Effort · Value · Impact
- Stakeholder management
Design
- Figma & prototyping
- UX flows & wireframes
- Design systems
- Visual design
Tech
- React / TypeScript
- Next.js
- Full-stack development
- APIs & integrations
- Agile · Scrum
Leadership
- Teaching & mentoring
- Team coordination
- Cross-functional communication
- Decision-making
- Strategic planning
Built things from scratch. Twice.
During my studies I co-founded two startups, diving in before I felt fully ready and learning faster than any classroom could teach. Both were about shipping fast, staying close to users, and iterating in the open.
DeskspaceLed a cross-functional team from idea to launch using Agile and Design Thinking, running user testing and market research to validate decisions and refine the roadmap based on early adopter feedback.
View case study →
FluxenseLed product strategy for a B2C platform through user research, competitive analysis, and market insight, defining the MVP, prioritising the backlog, and keeping stakeholders aligned through demos and written specs.
View case study →Not one thing.
Not just a product manager.
Not just a developer.
I'm Romanian born and moved to Denmark at 18 to study Computer Science. Since then I've worked across code, product, and live event operations, from Aalborg to Copenhagen to Prague. This site is focused on the product management side of that: how I turn ambiguous problems into shipped, measurable outcomes. I still write code when it's the fastest way to get something built, but that's a tool in service of the product, not a separate identity competing for your attention here.
Computer Science
University College of Nordjylland · Aalborg
2019 – 2023
Technology Entrepreneurship
Danmarks Tekniske Universitet · Copenhagen
2023 – 2025
Where chaos meets execution.
Every summer, I trade the office for a festival. I love the controlled chaos, the split-second decisions, the satisfaction when thousands of people have a great time and have no idea how much coordination it took.
Stage Manager
Roskilde Festival
Coordinated live performances for the Apollo stage. Managed technical crews, oversaw stage setups, and maintained close communication with artists and production teams.
Recurring · Roskilde, DKCrew Center Manager
Distortion
Managed crew operations at Copenhagen's urban music festival, including logistics, scheduling, and real-time problem solving in a city-wide setting.
Recurring · Copenhagen, DKStage Manager
Uhørt
Stage management for Denmark's festival for emerging music talent, keeping performances on time and artists supported.
Recurring · Copenhagen, DKStage Manager
O Days
Orientation festival stage management, coordinating performances and transitions for one of Denmark's key student events.
2024 · Copenhagen, DKLet's build something together.
I'm actively looking for product manager and designer roles, ideally somewhere that values breadth as much as depth. If that's your team, I'd love to hear from you.
sebastian.ioan.voinea@gmail.com