Application Software Engineer, Endpoint Security

About Oneleet:

Oneleet is on a mission to revolutionize the industry. We make cybersecurity easy, effective, and painless through a comprehensive platform that helps companies build, manage, and monitor their cybersecurity programs.

Backed by Y Combinator (S22) and top-tier VCs, our founding team brings over a decade of penetration testing and cybersecurity experience. Join our remote-first crew of opinionated rebels building a category-defining company to fix a broken, fragmented industry.

Who we’re looking for:

We value passionate self-starters with a growth mindset and a bias for action and personal accountability. If you love solving hard problems, thrive in ambiguity, and want to make a real impact, you’ll fit right in.

We’re especially drawn to:

• Rebels with a cause — frustrated with the status quo and eager to disrupt it.

• Opinionated (but not obstinate) builders — decisive yet collaborative, who help us move fast.

• Clear communicators — who own their ideas and follow through.

Our mission is simple: make effective cybersecurity painless. We believe cybersecurity should empower, not burden. This belief unites our team and drives every decision we make.

If you’re ready to challenge the status quo and help shape the future of cybersecurity, we’d love to meet you.

As an Engineer on the Oneleet Agent team, you'll be responsible for developing and maintaining our cross-platform endpoint security agent that monitors, configures, and protects employee devices. You'll work on everything from low-level system configuration automation to high-level API design that enables seamless communication between endpoints and our cloud platform.

You'll architect solutions that collect security telemetry, enforce compliance policies, and monitor for vulnerabilities across Windows, macOS, and Linux environments. This role requires deep technical expertise in system programming, security best practices, and the ability to build software that operates reliably in diverse enterprise environments.

As a seed stage startup, you'll collaborate directly with the founding team and have significant influence over the technical direction of our endpoint security capabilities.

Key Responsibilities:

• Design and implement cross-platform agent functionality for Windows, macOS, and Linux using Go and JavaScript

• Build low-level configuration automation and system monitoring capabilities that interact with OS-specific APIs and security frameworks

• Develop secure communication protocols between agents and our cloud platform using gRPC or REST APIs

• Implement real-time threat detection and response capabilities at the endpoint level

• Create robust update and deployment mechanisms that ensure agents remain current without disrupting user workflows

• Build telemetry collection systems that provide visibility into device security posture while respecting privacy

• Collaborate with the security team to implement new detection rules and compliance checks

• Ensure agent performance is optimized to minimize system resource usage

• Develop comprehensive testing strategies for multi-OS compatibility

• Create tools and dashboards for monitoring agent health and deployment status across thousands of endpoints

Qualifications:

• 5+ years of professional software development experience with a focus on systems programming or security software

• Strong experience with Go and JavaScript for building production-grade applications

• Deep understanding of operating system internals across Windows, macOS, and Linux

• Experience with low-level configuration automation and system administration across multiple platforms

• Proven experience with gRPC or REST API design and implementation

• Experience building software that runs with elevated privileges while maintaining security

• Strong understanding of endpoint security concepts and best practices

• Experience with cross-platform development challenges and solutions

• Excellent debugging and troubleshooting skills for complex system-level issues

• Bonus: Experience with Electron for building cross-platform desktop applications

• Bonus: Experience with Windows APIs, macOS system frameworks, or Linux kernel interfaces

• Bonus: Background in cybersecurity, particularly endpoint detection and response (EDR) or mobile device management (MDM)

• Bonus: Experience with certificate management and cryptographic operations

• Bonus: Familiarity with compliance frameworks (SOC2, ISO27001, HIPAA)

• Bonus: Experience with real-time data streaming and event processing

• Bonus: Bachelor's or Master's degree in Computer Science, Cybersecurity, or related field

Why Oneleet?

At Oneleet, you’ll join a tight-knit team of rebels redefining the cybersecurity industry. We move fast, own our work, and challenge outdated models to make security effortless and effective for companies.

Here’s what makes us special:

• We value impact over titles, autonomy over micromanagement, and clarity over jargon.

• You’ll tackle meaningful, hard problems with real-world consequences.

• You’ll work with smart, kind, and ambitious teammates who lift each other up.

Perks & Benefits

• Comprehensive health & welless benefits

• Competitive comp & equity

• Generous PTO, including floating holidays to honor what matters most to you

• Flexible, remote work culture

• Quarterly off-sites to cool places (Amsterdam, Italy, etc).

Remote-First & Global Hiring

We’re a remote-first company and hire globally in regions where we can legally engage talent—either directly or via our employer-of-record (PEO) partner. If you’re based outside the U.S., we’ll explore the most compliant hiring arrangement for your location.

U.S. Hiring & E-Verify

For U.S.-based candidates, Oneleet participates in E-Verify to confirm employment eligibility, in accordance with federal regulations.