Senior Fullstack Engineer (w/m/d)

Flinn.ai; Wien; Remote; EUR 90,000 - 140,000; Full time

Benefits offered by this job

Equity package

Flexible hours

Remote work

Team off-site

Job summary

Flinn.ai is seeking a product-minded Fullstack Engineer with a strong AI focus to build AI native products that enhance the safety of medical devices. You will own end-to-end features across the stack—frontend (React), backend (Node.js), and databases—while partnering with product to translate user feedback into the roadmap.

Hybrid/remote collaboration across Europe is expected, with equity and long-term growth opportunities.

Qualifications

• Senior engineer with production web app experience and ownership mindset.
• Hands-on experience building AI-powered product features or tooling.
• Strong frontend (React) and backend (Node.js) skills.
• Comfortable working in product-led, cross-functional teams and ambiguity.

Responsibilities

• Own end-to-end product features from design to production.
• Collaborate with product to translate customer feedback into roadmap decisions.
• Work across full stack: frontend, backend, and databases.
• Apply AI tooling to shipping features and improve safety and efficiency.

Skills

Senior engineer

AI tooling experience

Cross-functional collaboration

Ambiguity tolerance

Product mindset

Strong communication

Frontend development

Backend development

Tools

React

Node.js

AI tooling platforms

Job description

At Flinn, we’re redefining how medical device manufacturers create safer and better products 10x more efficiently. To shape the development of our existing and new products and to extend and scale our technical platform, we are looking for a product-minded Fullstack Engineer with a strong AI focus. You will be building AI native products that increase the safety of medical devices and will be playing a key role in growing our tech team further.

Why Flinn?

• We are building a truly exceptional culture: While many companies claim to have a great culture, we invite you to discover what truly sets ours apart. Visit our career page, speak with our team, listen to our founders’ podcast, or experience our culture first‑hand during the interview process.
• Make a Meaningful Impact: Your work at Flinn contributes directly to solutions that improve people’s health and lives by making high-quality health products accessible for everyone.
• Experienced, well‑funded, highly professional: As well‑funded startup veterans, we know how to sustain long‑term business health and success, ensuring an environment for continuous personal growth.

What’s in it for you?

• Join a fast-growing, well‑funded European startup backed by experienced founders and investors.
• Be part of a mission‑driven health‑tech company whose work directly improves people’s lives.
• Take end‑to‑end ownership of core operational processes that keep the company running.
• Work in a high‑trust, low‑ego environment with autonomy and clear ownership.
• Enjoy flexible working hours, remote flexibility, and regular team time off‑site.
• Receive one of the most employee‑friendly equity packages, including fair vesting terms and profit‑sharing opportunities.
• Grow in a professional, high‑standard environment that supports long‑term personal and career development.

Your contributions to our journey:

• Own a piece of our product end‑to‑end - either building a new module 0→1 with real autonomy over technical design, or strengthening an existing team already shipping in production.
• Work hands‑on across the full stack: frontend (React), backend (Node.js), and the relational/non‑relational databases underneath.
• Partner directly with product - understand why a feature matters to a customer, not just what to build; help turn customer feedback into roadmap decisions.
• Use AI tooling as part of your day‑to‑day build process, and in some cases help us ship AI‑powered features into the product itself.
• Help shape our architecture, engineering standards, and hiring as we grow the team.

We are not just looking for someone to complete Jira tickets, but rather to be actively involved in decision making (product & tech) and take ownership and initiative.

What you need to be successful:

Must-have:

• Proven track record designing, building, and maintaining complex, production web applications as a senior engineer.
• Hands‑on experience building with AI tooling, or building AI‑powered product features.
• Solid backend experience (preferably Node.js) and frontend experience (preferably React).
• Solid understanding of both relational and non‑relational databases.
• Experience working closely with product in a cross‑functional, product‑led environment.
• Comfortable operating with ambiguity and building infrastructure and processes as you go.

Nice‑to‑have:

• Experience in a founding engineer or 0→1 building context.
• Background as an engineering manager who's chosen to move back into hands‑on building - a profile that's worked well for us before.

Attributes we are looking for:

• You have a positive, problem-solving mindset and a clear bias for action - you bring your own ideas and solutions proactively.
• You speak up. We're hybrid, so if you have an opinion, a concern, or a better idea, we need you to say so.
• You have a passion for sharing knowledge and mentoring less experienced engineers, and you lead by example.
• You're a good communicator with both technical and non‑technical people, and you give and receive direct, open feedback well.
• You're pragmatic and adaptable, comfortable reacting to new findings in a dynamic, still‑maturing environment.
• You care about the product and the problem it solves - you see technology as a tool, not an end in itself.

At this stage of our company, we can only accept applications from people who are based in Europe with either European citizenship, an active working visa or being self‑employed and joining us as a full‑time contractor (Except for US‑based roles).

We strive to remove barriers, eliminate discrimination, and ensure equal opportunity through our transparent recruitment process. We are open to all groups of people without regard to age, color, national origin, race, religion, gender, sex, sexual orientation, gender identity and/or expression, marital status or any other legally protected characteristic.