Middle/Senior Fullstack Web Engineer (Backend-Focused)
Suggested starting date: June 2026, Location: Vienna, Experience level: Mid to Senior
About us
Holloid is Austria’s most innovative startup (trend, statista), a high-tech university spin-off revolutionizing bioprocess monitoring through in-line holographic microscopy. We empower some of the world’s largest food, pharma, and water companies to \"see the invisible\" - enabling better decisions, cleaner processes, and next-level automation. Our core offering includes a sophisticated SaaS platform, which delivers these critical insights and analytics to our users, transforming complex data into actionable intelligence. Backed by the EIC Accelerator and growing fast, we're turning cutting-edge science into real-world tools for sustainable food production, industrial fermentation, and environmental safety.
Key responsibilities
● Develop internal tools and customer-facing B2B SaaS web applications in a fast-growing deep tech startup
● Take ownership of backend systems, architecture, scalability, and performance
● Improve application reliability, maintainability, and overall system quality
● Write clean, well-tested, and well-documented code
● Contribute to architectural decisions and technical direction
● Support deployment processes and CI/CD pipelines
● Explore, prototype, and validate new technical approaches and product ideas
● Collaborate closely with product, design, and interdisciplinary teams
Requirements
● Several years of professional software engineering experience
● Strong backend expertise with Node.js and Express
● Solid experience with MongoDB and Mongoose (schema design, performance tuning, indexing), cloud infrastructure services and deployment on major cloud pla