Cobalt • Remote — Germany / UK

Senior Fullstack Engineer


Fully flexible hours

Dog friendly

Job Description

Who We Are

Cobalt was founded on the belief that pentesting can be better. Our pentests start in as little as 24 hours and integrate with modern development cycles thanks to the powerful combination of a SaaS platform coupled with an exclusive community of testers known as the Cobalt Core. Accepting just 5% of applicants, the Core boasts over 400 closely vetted and highly skilled testers who jointly conduct thousands of tests each year.

Our award-winning, fully remote team is committed to helping agile businesses remediate risk quickly and innovate securely. Today, over 1,000 customers use Cobalt to run pentests on demand via Pentest as a Service, AKA PtaaS, a space which Cobalt pioneered (you could even say we wrote the book on it) and continues to lead.


All organizations need security testing for their software and we are building the world’s largest and smartest pentest management platform to help solve this challenge at scale.

Our mission in the Growth Experience Team is to attract, acquire and activate new customers to the Cobalt service. Our team is composed of a core of Engineers, Product Manager and Product Designer while we have Data-, Marketing- and Sales-members just a Slack message away. We believe that the best outcomes originate from a team where everyone has a deep understanding of the problem, thus our engineers not only develop code but also collaborate in ideation, data analysis and hypothesis definition. This enables us to implement experiments at a high pace.

We are looking for a Senior Fullstack Engineer, focused on the frontend, who is excited about accelerating customer growth. You will contribute to our product software stack with a modern JavaScript-based ecosystem (React) + Ruby on Rails / Kotlin + Cloud Infrastructure (GCP, Kubernetes, etc).

What You'll Do

  • Be an active member of a cross-functional Growth Team as we build the best Pentesting-as-a-Service (PtaaS) platform
  • Collaborate with product, marketing, and data teams to analyze opportunities, brainstorm ideas and deliver creative experiments to achieve growth goals for the company
  • Work within a remote-first engineering team
  • Participate in agile development and continuous delivery processes

You Have

  • 5+ years of professional experience with web development
  • Experience in creating and consuming RESTful APIs
  • Knowledge of application architecture, security, and reliability concepts
  • A proactive attitude & willingness to participate in team discussions
  • A collaborative mindset with the wish to work alongside UX/UI designers
  • A high comfort level within a remote-first, globally distributed company
  • An analytical mindset and interest in data
  • A growth-oriented mindset — you're always interested in learning and stepping out of your comfort zone
  • Good written and verbal communication in English

Bonus If You Have

  • Experience working in a Growth Team or in a startup
  • Experience in Ruby
  • Experience providing support and guidance to other developers

Diversity at Cobalt

With over 45 nationalities already at Cobalt (and counting) we respect and celebrate diversity! We’re proudly committed to equal employment opportunities regardless of your gender, religion, age, sexual orientation, ethnicity, disability, or place of origin. We support each other and are grateful for each Cobalter's contribution to our mission — let's make security dance!

Please apply even if you don't think you meet all of the criteria above but are still interested in the job. Nobody checks every box, and we're looking for someone excited to join the team.

Why You Should Join Us

  • Earn competitive compensation and an attractive equity plan
  • Save for the future with pension and benefit from statutory healthcare
  • Treat yourself to paid remote lunches
  • Get to know your team during our team events
  • Leverage stipends for:
    • Wellness
    • Work-from-home equipment & wifi
    • Learning & development
    • Unlimited books
  • Grow in a passionate, rapidly expanding industry operating at the forefront of the Pentesting industry
  • Work directly with experienced senior leaders with ongoing mentorship opportunities
  • Make the most of our flexible, generous paid time off
  • Work remotely from anywhere in the UK or Germany
  • Explore the world with our travel bonus payouts at your 2, 3, and 5 year anniversary

Company benefits

Enhanced maternity leave – 16 weeks paid
Enhanced paternity leave – 16 weeks paid
Adoption leave – 16 weeks paid
Work from anywhere scheme
Unlimited annual leave
Work from home allowance
Co-working space allowance
Teambuilding days
Teambuilding holidays

The FlexScore® is the result of a rigorous 2-step verification of a company’s flexibility

First we assess the flexibility options Cobalt provides and then we anonymously survey a statistically significant proportion of their employees to make sure Cobalt is as flexible as they say they are. Our assessment is based on the six key elements of flexibility: location, hours, autonomy, benefits, role modelling and work-life balance.

We ask the hard questions so you don’t have to.

Working at Cobalt

Company employees


Gender diversity (male:female)


Office locations

USA, Germany, UK

Funding levels


Hiring Countries

United Kingdom
United States
What employees are saying

"Part of the reason why I joined Cobalt was the flexibility – being able to work from home, take care of my dog, run errands, and also unplug after hours was important to me, and everyone at Cobalt gets it."

Anonymous Cobalt Employee

Awards & Achievements
Most flexible Saas & Dev Software companies

Most flexible Saas & Dev Software companies

Industry awards 2022