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Marius Jigoreanu

@mariusjigoreanu

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Senior software engineer delivering AI-first full-stack features with high quality.

Romania

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What I'm looking for

I’m looking for an AI-first product team where I can own end-to-end full-stack features, design solid APIs, collaborate across functions, and keep quality high—while mentoring juniors and contributing to zero-to-one innovation.

I’m a Senior Software Engineer with solid full-stack experience and a reputation for exceptionally high-quality software—recognized with an award for the least amount of bugs in an 8-person development team at USLege.ai. I’m known for AI-first development, complex API architecture, and shipping end-to-end features with real impact on retention and churn.

In my recent role, I took full ownership of both frontend and backend, led critical features, and integrated conversational AI agents with orchestrated agentic workflows. Earlier, I’ve led zero-to-one product development as a Senior Full Stack Developer, architected decoupled UI components for performance at scale, and redesigned/refactored backend APIs—while providing hands-on team leadership to juniors and offshore team members.

Experience

Work history, roles, and key accomplishments

Staff Software Engineer

USLege

Sep 2024 - Feb 2026 (1 year 5 months)

Owned full features end-to-end, building full-stack UI and data engineering (ETL) components. Contributed to AI integration using conversational AI agents and orchestrated agentic workflows within the product ecosystem.

TailwindCSS Shadcn Ui React TypeScript MUI PostgreSQL Prisma Data Engineering (ETL)Conversational AI Agents Agentic Workflow Orchestration

Senior Full Stack Developer

Freelance

Dec 2023 - Aug 2024 (8 months)

Led zero-to-one development of an automotive SaaS platform, enabling track-day bookings, reservations, voucher sales, document uploads, and photo purchases for visits. Delivered high-quality output while working independently for high-demand clients.

React Vue Laravel TypeScript Jest

Software Developer

Laerdal Copenhagen

Jun 2022 - Nov 2023 (1 year 5 months)

Developed full-stack features on Laerdal's proprietary framework using Haxe, and collaborated with cross-functional teams through daily Scrum, refinement, and biweekly reviews. Supported technical architecture/design proposals to address depth and implementation challenges.

esbuild React TypeScript Haxe HTML CSS ES6+Agile Scrum System Architecture NodeJS

Senior Engineer

Cobiro

Feb 2020 - May 2022 (2 years 3 months)

Contributed to critical technology and architecture decisions, and migrated legacy code to Laravel and improved standards. Redesigned and refactored an older API, including a fully documented Swagger implementation.

PHP Laravel REST API Design Swagger Architecture Refactoring Agile

Fullstack Developer

Siteattention A/S

Jun 2017 - Jan 2020 (2 years 7 months)

Led development of the core API, external integration endpoints, and integration guidelines/architecture. Managed DevOps and automations (CI/CD), facilitated daily Scrum, and guided team developers while coordinating merges.

React TypeScript PHP MySQL REST APIs CI CD Agile Scrum Team Leadership NodeJS

Fullstack Developer

Copenhagen Game Lab

Mar 2016 - May 2017 (1 year 2 months)

Developed web, games, and simulations for training, education, and entertainment. Participated in UI/UX design, maintained clean architecture while adding features, and owned development process and delivery.

React TypeScript JavaScript PHP MySQL UI UX Game Development Software Architecture NodeJS

Assistant Lecturer / TA

IT University of Copenhagen

Jan 2013 - May 2016 (3 years 4 months)

Served as Assistant Lecturer/Teacher Assistant across multiple courses, focusing on leading, mentoring, and guiding individuals and multidisciplinary teams. Prepared exercises and course materials, tracked student progress, reviewed assignments, and facilitated communication between students and professors.

Teaching Assistance Mentorship Student Assessment Curriculum Support Team Facilitation Digital Media Aesthetics Game Design Playful Design Cloud Computing

IT Consultant

Execute.dk

Oct 2012 - Jan 2015 (2 years 3 months)

Developed a new HR system from scratch with full frontend and backend involvement, balancing cost efficiency with non-expert usability and flexibility. Led business intelligence and development processes, negotiated requirements with other parties, and contributed to the architecture of the overall business environment.