Systems Developer - Email Security (80-100%), Zürich (Kreis 11)

Systems Developer - Email Security As a Systems Developer in the Email Security Team, you will build and operate a highly scalable, globally deployed email security solution. This is a builder-operator hybrid role: you will design, implement, deploy, and maintain the components you create, from initial concept through production operations.

You will be part of the core team developing email services for customers. Your work will include:

Developing filtering plugins, internal tools, and management infrastructure

Integrating third‑party products (open source such as Postfix, or OEM components like proprietary malware engines) into our Linux‑based and cloud stacks

Building and maintaining public APIs for email processing and configuration

Extending monitoring, alerting, and log aggregation capabilities

Troubleshooting and debugging production systems

Life‑cycle management and optimization of existing deployments, including cloud‑native environments

You will own your components end‑to‑end. Operational excellence matters as much as code quality.

This role is not a fit if you are looking for a pure software development position where someone else handles deployment and operations, or a system administration role focused on configuration and support rather than development.

We value both specializations. This role simply requires solid foundations of both areas in one person.

Required Qualifications

Higher education (ETH, university, FH) in Computer Science or a related field

2+ years of professional experience in a relevant role

Proficiency in software development with scripting languages (e.g., Bash, Perl, Python) and a concurrent compiled language (e.g., Go, C++, C#, Rust)

Experience with Linux or another UNIX‑based operating system, including comfort working at the system level

Knowledge of email protocols and security standards: SMTP, TLS, DNS, DKIM, DMARC

Familiarity with software and system testing practices

Understanding of monitoring and observability principles

Fluent in English

Clear communication skills and ability to work both in a team and independently

Nice to Have

Familiarity with proprietary email backends such as Microsoft 365

Experience using LLM‑assisted development tools

Knowledge of container and cloud technologies (Kubernetes)

Experience with general network protocols (TCP/IP, HTTP)

In addition to your work in a Development team, you will become certified as a Mission Control Engineer, providing you with knowledge in a wide area covering networking and security topics. This will give you the opportunity to visit our Network Operations Centers in Honolulu, Hawaii for 3‑month deployments.

What We Offer Want to join a team that enjoys making secure connectivity simple for our customers? You’ll be among people who believe in: Caring PASSIONATELY about keeping our customers safe – We’re dedicated to solving problems. Whatever it takes. Thinking UNCONVENTIONALLY to stay ahead – The world never fails to surprise us. So let’s surprise it first.Doing the hard work to make things SIMPLE– Craft and hone something that delights in its simplicity. Working COLLABORATIVELY to build success – The power of the team will always make us faster and better. As a testament to this, Open Systems has been recognized as an outstanding place to work. You’ll be surrounded by smart teams who enrich your experience and provide opportunities you will need to develop your skills and advance your career.We look forward to receiving your online application (please note that you need to compress your application into two attachments). Only direct applications will be considered. Come as you are! We are looking for amazing people of diverse backgrounds, experiences, abilities, and perspectives. Open Systems welcomes and encourages diversity in the workplace regardless of race, gender, religion, age, sexual orientation, disability, or veteran status.

About Open Systems Open Systems is about secure connectivity made easy, combining SD‑WAN, Firewall, SWG, CASB, and ZTNA into a framework that supports secure connectivity across cloud and hybrid environments and locations. Open Systems Managed SASE provides a comprehensive SASE solution through an easy‑to‑use customer portal, underpinned with a unified data platform to drivefuture innovation, all delivered as a 24x7 managed service.

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