Threema is the world’s best-selling secure messenger for both private users and businesses. Since 2012, we have been working tirelessly to ensure that our users can communicate freely without worrying about their privacy. Our growing user base includes millions of private customers and thousands of businesses and organizations from all over the world.

We are growing and looking for a new team member to join as a

UX/UI Designer

Your Role

At Threema, we build tools that allow individuals, corporations, and governments to communicate with absolute privacy. In our world, UX design isn't just about aesthetics, it is the deciding factor in whether critical security features are adopted or bypassed.

You won't just be producing screens from a brief; you will be setting the conceptual direction across multiple platforms, navigating complex technical constraints, and helping protect millions of users.

Your Responsibilities

• End-to-End Ownership: Set the visual and conceptual direction for a major product area across mobile, desktop, and web platforms.

• Security & Privacy UX: Design intuitive patterns for complex cryptographic and security flows, ensuring high-stakes actions are foolproof and transparent.

• User Research & Discovery: Lead discovery for ambiguous product problems, select the right research methodologies, and translate user insights into concrete design decisions.

• Design System Governance: Help evolve and scale our cross-platform design system, establishing clear governance and adoption workflows.

• Cross-Functional Leadership: Partner as a peer with Product and Engineering leads to shape the roadmap, balance technical trade-offs, and defend design decisions to leadership.

• Emerging Tech UX: Shape how we approach modern workflows and features (including AI/LLM integration where applicable), specifically designing for system uncertainty, error states, and trust signals.

Your Profile

• Experience: 5+ years of experience as a UX, UI, or Product Designer, preferably handling complex digital products (B2B or SaaS experience is a strong plus).

• Portfolio: A proven track record of shipping end-to-end, multi-platform experiences. We want to see your process, your architectural thinking, and how you solve complex user flows.

• Security Mindset: A genuine passion for privacy and secure communication. You understand how design choices impact user safety.

• System Thinking: Practical experience scaling design systems and managing the messy realities of implementation and engineering alignment.

• Communication: Exceptional ability to articulate design rationale, take a stand on ambiguous problems, and collaborate with technical stakeholders.

• Languages: Fluent in both German and English (written and spoken).

Your formal education matters less to us than your portfolio, your problem-solving process, and how you think.

What We Offer

• A young, motivated team with straightforward communication

• Flexible working hours, option to work from home up to two days per week

• Option to work from anywhere for two weeks per year

• Option to take unpaid leave

• Public transportation discount or parking space (electric car charging available)

• Free use of fitness room, including a fitness trainer once a month

• Professional massage once a month

• Internal German or English courses

• A great coffee machine ;-)

• Regular company events and aperitifs

• The good feeling of contributing to the effective protection of the privacy of millions of people

Place of work: Pfäffikon SZ (Greater Zurich Area)

Start date: Immediately or by agreement

Have we sparked your interest?

We believe that diverse teams build better products. We welcome and encourage applications from people of all gender identities and expressions, backgrounds, and perspectives. Your unique experience is an asset, and we’d love to hear from you.

Applications sent via email cannot be considered. Please use the official "Apply" button below so we don't accidentally miss your resume in our crowded inboxes

For agencies: we are filling this role directly and do not accept unsolicited candidate profiles.