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Principal Software Engineer in Valencia or Remote


70,000 - €80,000
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Job Description

Zscaler (NASDAQ: ZS) accelerates digital transformation so that customers can be more agile, efficient, resilient, and secure. The Zscaler Zero Trust Exchange is the company’s cloud-native platform that protects thousands of customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location.

With more than 10 years of experience developing, operating, and scaling the cloud, Zscaler serves thousands of enterprise customers around the world, including 450 of the Forbes Global 2000 organizations. In addition to protecting customers from damaging threats, such as ransomware and data exfiltration, it helps them slash costs, reduce complexity, and improve the user experience by eliminating stacks of latency-creating gateway appliances.

Zscaler was founded in 2007 with a mission to make the cloud a safe place to do business and a more enjoyable experience for enterprise users. Zscaler’s purpose-built security platform puts a company’s defenses and controls where the connections occur—the internet—so that every connection is fast and secure, no matter how or where users connect or where their applications and workloads reside.


Job Description

You will work on the Cloud Browser Isolation team which is a distributed team that works fast and lives on the cutting edge of backend, frontend and infrastructure software engineering. We favor open-source reuse but we are not afraid of building stuff ourselves where it makes sense. Our philosophy is: done is better than perfect and we strive to work iteratively and improve our code along the way so that we can deliver fast and reliably to delight our customers. The work environment is fast-paced and requires the ability to take initiative and manage ambiguity to drive effective results. This role may interface with customers, subject matter experts, technical experts, developers and QA engineers located globally and in different time zones.

The Principal Software Engineer will report to the Sr. Manager, Software Engineering. Zscaler is looking for a seasoned and agile software engineer that has a unique combination of skills. The ideal candidate will play a key role in all phases of the product development cycle, from definition, design, through implementation, test, release and monitor of components of our Browser Isolation Platform. This is an excellent opportunity to join a small, dynamic team that is working on cutting edge Browser Isolation technology to evolve our current cloud security flagship products: ZIA and ZPA.

About the Isolation Experience team

 The team's mission is to ensure a seamless isolation experience for our users. That is: develop, maintain and improve the user experience, session spin up performance and enhance with isolation specific user experience.


Work closely with Sr Manager and Sr. Architect, drive technical excellence and innovation, architecture / system design, mentoring, tech adoption and alignment, develop spikes and experiments​, code reviews and feedback, technical capacity planning​, tools adoption, establish SLAs, define metrics & monitoring​ objectives, overseeing patterns and practices, alignment with other tech leads​, hands-on coding 30% to 70% of the time, system roadmap planning (initiatives about reliability, scalability availability, tech debt, etc.)​, development process (shared with team, Sr. Manager and Sr Architect), team visibility and recognition.


  • 10+ years of experience in software engineering with a minimum of 5 years in developing JavaScript / TypeScript based solutions for the web, node.js, desktop or mobile.

  • Must be proficient in JavaScript / TypeScript

  • Able to design and build protocol based services.

    • Must have: RESTful APIs and solid understanding of HTTP protocol.

    • Nice to have: gRPC, WebSocket, Thrift, etc.

  • Have a proven record of having fulfilled a similar role in the past.

  • Solid understanding of systems design, programming principles, browsers, node, DOM, HTML and CSS.

Nice to haves:

  • Experience working with JS desktop apps is a plus

  • Experience with transpilers and bundlers is a plus

  • Experience programming in Golang

  • Experience working with React.js / Angular 1.x and 2.x+ / Vanilla JS is a plus.

  • Experience in developing media streaming products is a plus.

  • Experience with container technologies like Docker and container orchestration like Kubernetes is a plus

  • Experience with working with automation tools for code quality, testing, CI/CD is a plus.

Additional Information

Please note that the main team is based in Valencia, Spain but we are also considering candidates from Poland

Why Zscaler?

People who excel at Zscaler are smart, motivated and share our values. Ask yourself: Do you want to team with the best talent in the industry? Do you want to work on disruptive technology? Do you thrive in a fluid work environment? Do you appreciate a company culture that enables individual and group success and celebrates achievement? If you said yes, we’d love to talk to you about joining our award-winning team.

Zscaler is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.


About Zscaler

  • Cyber Security

  • San Jose, CA, USA

  • 1,000-5,000

  • 2008

We’re on a mission to make the internet your new secure corporate network.

Back in the day when your users were all on the network and your applications resided in your physical data center, it made sense to establish a secure perimeter around your network. But those days are over, the perimeter is gone, and network security is all but irrelevant.

Instead, you need to put your defenses and controls where the connections occur— the internet — so that every connection is fast and secure, no matter how or where users connect or where their applications reside.

By moving applications and infrastructure to the cloud and untethering employees from their desks, you can realize tremendous advantages in productivity, agility, and cost containment. With our 100% cloud built secure platform, Zscaler can help you make the move to the cloud, securely.

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