Mark O Donnell
Head of Product & Engineering @Responsible
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WORK HISTORY
Head of Product & Engineering @Responsible
Belfast, GB
Lead product and engineering across Responsible, owning product strategy and delivery across the business. Manage acquired platforms and teams, including the KLEKT engineering team, and drive major launches across web and mobile. Work closely with leadership on forecasting, partnerships, investor discussions, and broader commercial strategy.Stay highly hands-on technically, building much of the platform in TypeScript using React Router / Remix, AWS serverless services, and Postgres. Develop logistics and commerce capabilities to support tariffs, customs, and cross-border trade, including solutions that enable inventory to be sold from Asia to the US in partnership with DHL.Lead AI and data work across image recognition for clothing and luxury goods, real-time second-hand pricing analysis, and large-scale scraping and DuckDB-based pipelines for clean, normalised market intelligence. Work directly with eBay, Amazon and Depop on API integrations, while supporting major clients including Vogue with second-hand resale operations.
EDUCATION
Birmingham City University
Bachelor of Science (BSc), Sound Engineering And Production
Queen's University Belfast
Master of Science (M.Sc.), Software Development (Conversion)
SKILLS
ABOUT MARK O DONNELL
I’ve spent the past few years building a mix of products, platforms, and community projects - mostly in technology, occasionally in events and creative spaces.I’m currently Head of Product and Engineering at Responsible, where I work across fashion resale, logistics, and multi-marketplace infrastructure. Before that, I was CTO and co-founder of Haru (acquired in 2023), leading work on single-SKU logistics, SEO at scale, product metadata systems, image recognition, and AI-driven operational tooling.Alongside that, I run musical-theatre and live music events, and built kwiktix.co - a lightweight, organiser-first ticketing platform designed for local events that need something more tailored than the usual options.Earlier in my career, I co-founded an energy analytics company (acquired in 2019), consulted on cloud architecture, and supported early-stage teams in getting their products shipped. I like building things that are genuinely useful - whether they scale to millions of users or simply make life a little easier for the people who rely on them.
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