Senior Software Engineer

HackerOne is a global leader in offensive security solutions. Our HackerOne Platform combines AI with the ingenuity of the largest community of security researchers to find and fix security, privacy, and AI vulnerabilities across the software development lifecycle. The platform offers bug bounty, vulnerability disclosure, pentesting, AI red teaming, and code security. We are trusted by industry leaders like Amazon, Anthropic, Crypto.com, General Motors, GitHub, Goldman Sachs, Uber, and the U.S. Department of Defense. HackerOne was named a Best Workplace for Innovators by Fast Company in 2023 and a Most Loved Workplace for Young Professionals in 2024.

HackerOne is at a pivotal inflection point in the security industry. Offensive security is no longer optional – it is the standard for forward-thinking companies that want to build trust and resilience in a world where AI-driven innovation and adversaries are moving faster than ever. With the industry shifting, HackerOne stands apart: we combine the ingenuity of the largest security research community with a best-in-class AI-powered platform, trusted by the world’s top organizations.

HackerOne Values

HackerOne is dedicated to fostering a strong and inclusive culture. HackerOne is Customer Obsessed and prioritizes customer outcomes in our decisions and actions. We Default to Disclosure by operating with transparency and integrity, ensuring trust and accountability. Employees, researchers, customers, and partners Win Together by fostering empowerment, inclusion, respect, and accountability.

Senior Software Engineer
Location: Groningen, Netherlands (2 or 3 days per week in the office)

Position Summary

Are you ready to join HackerOne’s Bug Bounty Product Line? As a Senior Software Engineer, you will work with the team's other Seniors, Product Managers, and Designers to be the technical lead for a variety of challenging projects and build delightful features and products for our community and the thousands of companies that trust HackerOne with their cybersecurity posture.

When you are not leading a project, you are a collaborative and effective software engineer and team member. You will interact with one of the world's most vibrant communities of security researchers and hackers and use this experience to build delightful features and products for them and the thousands of companies who trust HackerOne with their cybersecurity posture.

As a Senior Software Engineer, you combine broad technological expertise, deep domain knowledge, and an unquestionable dedication to business objectives as you intersect with the engineering organization. You seek leadership responsibilities, identify and spearhead new initiatives, and make systematic improvements to technical weaknesses they find in their squad’s codebases, as well as in shared codebases across the company.

As an AI-first company, we’re at the cutting edge of technology. And we’re looking for someone who can help push those boundaries even further. You should bring hands-on expertise in applying AI and LLMs to real business functionality, with experience building and optimizing agentic workflows. Just as important, you’ll need the curiosity and drive to stay ahead of the latest developments in this fast-moving field, spotting new opportunities and turning them into practical use cases for our platform. We value an experimental mindset, someone who’s not afraid to test, learn, and iterate quickly to bring powerful AI-driven features to life.

At HackerOne, we embrace a Flexible Work approach, enabling our team members to work remotely while maintaining productivity and collaboration. We are seeking candidates located in Groningen and the surrounding metropolitan areas to facilitate occasional in-person interactions as needed. This position will be hybrid; periodic in-person requirements will support team collaboration and foster stronger connections. This approach ensures flexibility while providing opportunities to build meaningful in-person relationships that strengthen our team and company culture.

What You Will Do

Your first 30 days will focus on getting to know HackerOne. You will join your new squad and begin onboarding - learn our technology stack, and meet our Hackeronies.

• By day 60 you’ll be involved in building a meaningful part of one of the projects and you will have become more connected with our community and various stakeholders

• Work as a project lead together with stakeholders, designers and product leaders

• Build, ship and maintain highly-available, performant and durable features, focused on (but not limited to) hacker-facing areas of our platform

• Work with your team to deliver key results for impactful objectives

• Be a part of cross-squad initiatives

• Mentor and be mentored by other engineers

Minimum Qualifications  

• 8+ years of development experience within a SAAS environment

• Experience with dynamically typed, OOP languages such as JavaScript, Objective-C, PHP, Python or Ruby.

• Practical SQL experience (5+ year, PostgreSQL preferred)

• Practical experience with React JS or similar libraries

• Experience leading technical projects through all phases of the Software Development Lifecycle

• GenAI experience

Preferred Qualifications

• Ruby on Rails (2+ years of experience)

• React JS (2+ years of experience)

• GraphQL

• Amazon Web Services

• Ability to coordinate efforts around new initiatives with senior engineers and product managers.

Compensation

• €90,000 – €110,000

• Offers Equity

#LI-MH1

Job Benefits:

• Health (medical, vision, dental), life, and disability insurance*

• Equity stock options

• Retirement plans

• Paid public holidays and unlimited PTO

• Paid maternity and parental leave

• Leaves of absence (including caregiver leave and leave under CO's Healthy Families and Workplaces Act)

• Employee Assistance Program

• Flexible Work Stipend

*Eligibility may differ by country

We're committed to building a global team! For certain roles outside the United States, U.K., and the Netherlands, we partner with Remote.com as our Employer of Record (EOR).

Visa/work permit sponsorship is not available.

Employment at HackerOne is contingent on a background check.

HackerOne is an Equal Opportunity Employer in the terms and conditions of employment for all employees and job applicants without regard to race, color, religion, sex, sexual orientation, age, gender identity or gender expression, national origin, pregnancy, disability or veteran status, or any other protected characteristic as outlined by international, federal, state, or local laws.

This policy applies to all HackerOne employment practices, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, compensation, benefits, training, and apprenticeship. HackerOne makes hiring decisions based solely on qualifications, merit, and business needs at the time.

For US based roles only: Pursuant to the San Francisco Fair Chance Ordinance, all qualified applicants with arrest and conviction records will be considered for the position.