# Marius-Octavian Matei | mariusom

> Founding engineer who builds healthcare systems that save lives. Platform Engineer in London, UK.

## About

I'm a pragmatic engineer who fixes real problems. Currently focused on healthcare, where software decisions directly impact patient outcomes.

At Dosium, I built a UKCA-marked medical device from scratch—backend, frontend, iOS app, infra. It now runs in NHS hospitals, reducing prescribing errors by 84% with potential £180M annual NHS savings.

Before that, I built Amber Care Plans as a solo engineer—4,600 users, £3M NHS savings, 80% of patients achieved their preferred place of death.

## Mission

**"Build things that matter. Fix problems that hurt."**

I believe in:
- **Pragmatism over perfection** – Ship, learn, iterate. Done > perfect.
- **Outcomes over output** – Code is a means to an end. Impact is the goal.
- **Ownership over handoffs** – Full-stack means full responsibility.
- **Healthcare focus** – Where software errors cost lives, not just money.

## Skills

### Languages
TypeScript, JavaScript, Swift, Python, SQL

### Frontend
React, Next.js, TanStack Start, Redux

### Backend
Node.js, Express, GraphQL, REST APIs

### Data
PostgreSQL, MongoDB, Redis, Elasticsearch

### Cloud & DevOps
AWS (Lambda, ECS, RDS), Docker, GitHub Actions

### Healthcare
SMART-on-FHIR, HL7 FHIR, SNOMED CT, UKCA

## Experience

### Dosium (Jun 2020 → Present)
**Founding Software Engineer** • London

Built entire tech stack for UKCA-marked medical device:
- Backend (Node.js/TypeScript), iOS app (Swift)
- Web dashboards (React/Next.js/TanStack Start)
- AWS infrastructure with NHS integration
- SMART-on-FHIR integrations (EPIC, Oracle Cerner)
- Deployed across 3+ NHS trusts

Key impact: 84% reduction in prescribing errors at Imperial College Healthcare NHS Trust, potential £180M annual NHS savings

### Imperial College Healthcare NHS Trust (Oct 2019 → Jun 2020)
**Senior Software Engineer** • London

- R&D initiatives on healthcare triage systems
- Multi-channel chatbots: Web, Facebook Messenger, Google Assistant

### Helix Centre (Aug 2017 → Oct 2019)
**Senior Software Developer** • Imperial College London

Built Amber Care Plans (Digital Care Planning):
- React/Node.js stack with EHR integrations
- Serverless: GraphQL, AWS Lambda, PostgreSQL
- SNOMED CT coding, HL7 FHIR data exchange

Key impact: 4,600 users, £3M+ NHS savings, 80% of patients achieved preferred place of death

### Onefinestay / Accor Hotels (Sep 2016 → Jul 2017)
**Software Developer** • London

- Architected headless CMS platform (Django/React) serving 50+ editors
- Powered 10,000+ property listings, reduced publishing time by 70%
- Led map-based property search increasing engagement by 35%

### Festicket (Nov 2014 → Sep 2016)
**Full Stack Developer → Senior Software Developer** • London

- Led team growth from 5 to 12 engineers
- E-commerce platform processing £5M+ in ticket sales
- 100,000+ festival-goers served

### Youjoin (Nov 2013 → Aug 2014)
**Co-Founder & Technical Lead** • London

- Co-founded social recruitment platform
- Architected full-stack system supporting 5,000+ users
- Technical spokesperson in investor meetings

## Education

**BSc Computer Science** • Universitate Alexandru Ioan Cuza, Iași

## Achievements

- **84% reduction** in prescribing errors at NHS hospitals
- **£180M potential** annual NHS savings through Dosium
- **£3M+ saved** by NHS through Amber Care Plans
- **4,600+ users** on solo-built healthcare platform
- **UKCA certification** achieved for medical device
- **2x founding team member** at healthcare startups
- **Team scaled 5→12** engineers at Festicket
- **12+ years** shipping production software

## Awards

- **HSJ Patient Safety Awards 2025** — Shortlisted
- **HTN Now Awards 2025** — Winner
- **HSJ Partnership Awards 2025** — Highly Commended

## Contact

- **Name**: Marius-Octavian Matei
- **Email**: marius@mariusom.com
- **Location**: London, UK

## Links

- **Website**: https://mariusom.com
- **GitHub**: https://github.com/mariusom
- **LinkedIn**: https://www.linkedin.com/in/mariusom/
- **X/Twitter**: https://x.com/mariusomdev