Investigate emerging vulnerabilities across the Ubuntu ecosystem, helping identify, assess, remediate, and document security issues.
Collaborate with internal engineering teams, upstream developers, and the broader open source community to deliver robust security fixes.
Contribute to security initiatives across the broader open source ecosystem and engage with industry communities.
They are a globally distributed security engineering team dedicated to protecting users and strengthening the security of open source software. The environment is highly technical, collaborative, and international, with opportunities to share knowledge through open source contributions and industry events.
Proactively identify and drive security improvements across the product and platform.
Partner with engineering teams to threat model new features and review designs early in development.
Build and improve security tooling, libraries, and workflows to make secure development the default path.
Fellow is an AI meeting assistant that helps teams record, transcribe, summarise, and act on their meetings. We are a Series A company backed by major venture firms, with a remote-first culture and a growing team.
Lead architecture and delivery of Linux kernel engineering initiatives across performance, security, and reliability.
Drive technical engagements with silicon and cloud partners to deliver optimized solutions.
Coach and guide engineers while coordinating complex initiatives across teams.
Our partner is a leading technology company focused on developing and maintaining the Ubuntu operating system and Linux kernel. They operate with a globally distributed team and emphasize open-source engineering, autonomy, and collaboration.
Configure and manage Linux security policies, including access controls, firewalls, and privileged-user management.
Monitor SIEM alerts and logs to identify threats, apply patches, and conduct vulnerability assessments.
Develop security automation scripts and incident response strategies to strengthen infrastructure.
Jobgether is an AI-powered recruitment platform that matches candidates with hiring companies. It operates with a remote-first culture and emphasizes fast, objective, and fair candidate evaluation through AI matching.
Own major product components and engineering workstreams from discovery to production.
Design scalable architectures and build production-grade software with focus on reliability and security.
Use AI-assisted development tools to improve engineering efficiency.
They develop Linux security products and automation systems. They are a remote-first team emphasizing professional development and challenging technical projects.
Design and build security-sensitive components for privileged execution on Linux endpoints.
Work across Rust, C, and .NET components to enforce least privilege and process authorization.
Diagnose complex Linux security issues involving authentication, permissions, and system behavior.
Keeper Security is a cybersecurity software company that protects organizations and individuals with zero-knowledge and zero-trust security. It is one of the fastest-growing companies in the space, with a global presence in over 150 countries.
Design, develop, and modernize network security products involving L2/L3/L4 protocols, kernel-space data paths, and scalable traffic processing.
Collaborate across Scrum teams to contribute to architecture, testing, and engineering practices that protect millions of end users.
Bring 7–12 years of C/C++ expertise and strong networking knowledge in TCP/IP, routing, and security to solve complex technical challenges.
This position is listed on behalf of a partner company that is building next-generation network security products. They offer a remote-first, collaborative environment with experienced engineering teams working across multiple technical domains.
Implement assigned security controls across Kubernetes, Linux, database, and model-serving environments.
Build monitoring, vulnerability scanning, and automation to keep security controls current.
Contribute to AI tooling, documentation, and evidence collection for federal reviews.
Axle is a bioscience and IT company offering advancements in translational research, biomedical informatics, and data science applications to research organizations. Their team includes biomedical science, software engineering, and program management experts who support top research centers, including NIH.
Lead threat modeling and secure design reviews across C++, Go, and Rust
Build and tune application security testing (SAST, SCA, secret scanning, DAST) and fuzzing harnesses
Operate PSIRT and build security champions program to raise the security bar
Redpanda is a unified platform for agent-data interaction, combining streaming, SQL analytics, and intelligent connectivity with governance for enterprise AI agents. It is a fast-moving, people-first organization with a small, high-trust security team and team members across the globe.
Threat model new product features and integrations, hardening systems with effective controls.
Operate and evolve the application security toolchain, keeping it high-signal for developers.
Own day-to-day security operations across the detection stack, triaging and resolving incidents.
Gauntlet builds the financial systems of the future, operating across the entire onchain finance stack to offer vault products for institutional clients. They serve over $1.5B in client TVL and combine traditional finance with crypto-native expertise.
Build secure-by-default infrastructure and automation to eliminate entire vulnerability classes across money-moving systems.
Own application security, threat modeling, and vulnerability disclosure from design review to production.
Partner with engineering to set security standards, make risk-based decisions, and ship fast without compromising safety.
Flex is building the AI-native private bank for business owners, re-architecting the entire financial system for entrepreneurs. Since launching in 2023, Flex has scaled to nine-figure annualized revenue, raised $100M+ in equity and $300M+ in debt, and operates with a high-bar, low-ego culture focused on speed and execution.
Combine security operations, software engineering, and site reliability to protect complex digital infrastructure.
Design, build, and operate security platforms, tooling, and automation for threat detection and incident response.
Mentor engineers, influence operational strategy, and contribute to open source security initiatives.
They build and operate a world-class Security Operations function. They are a distributed, agile engineering organization that values technical excellence and continuous learning.
Develop, test, and release improvements to the Ubuntu Pro client, a command-line tool managing specialist services on Ubuntu.
Collaborate with distributed teams, write high-quality Python code, debug issues, and review code from other engineers.
Work remotely with global travel 2-4 weeks per year for internal and external events.
Canonical is a leading provider of open source software and operating systems, publishing Ubuntu, a platform for AI, IoT, and cloud. With 1200+ colleagues in 75+ countries, the company is founder-led, profitable, and growing with a pioneering distributed work culture.
Get involved early in new products and features, using threat modeling and security design reviews to find problems before they reach production.
Dig into application architecture, APIs, authentication, authorization, data flows, cloud services, and third-party integrations to understand how systems could be attacked.
Own and improve security tooling across the development lifecycle, including SAST, DAST, dependency scanning, and secret scanning.
YipitData is a leading market research and analytics firm for the disruptive economy, raising $475M from The Carlyle Group at a valuation over $1B. They operate globally with offices in the US, APAC, and India, and have been recognized by Inc. as a Best Workplace for three consecutive years, emphasizing transparency, ownership, and continuous mastery.
Collaborate with global kernel engineering teams on Linux kernel development and optimization.
Diagnose and resolve complex kernel issues across diverse hardware platforms.
Contribute to upstream kernel development and improve testing automation.
The company focuses on Linux kernel engineering and optimization across hardware, cloud, and embedded systems. It operates with a globally distributed team and values autonomy, accountability, and continuous learning.
Partner with product and engineering teams to identify application security risks and frame them as clear business risks, launch options, and recommended next steps.
Read application code, configuration, pull requests, logs, and documentation to understand how systems work and where security risks may exist.
Contribute small code changes, scripts, detections, tests, secure defaults, or automation that improve AppSec workflows and reduce recurring issues.
Affirm is reinventing credit to make it more honest and friendly, giving consumers the flexibility to buy now and pay later without any hidden fees or compounding interest. The company is remote-first with a people-first culture, offering competitive benefits and equity rewards.
Build and deploy security tooling across endpoint management, supply-chain, infrastructure, and application layers.
Identify and remediate security gaps across production systems and development pipelines.
Lead incident response end-to-end and partner with engineering on secure design reviews.
Tempo is a layer-1 blockchain built for stablecoins and real-world payments, leveraging expertise from Stripe and Paradigm. We are a team of crypto-optimists moving fast to build infrastructure for onchain economic flows.
Integrate security into the SDLC through automation, testing, and continuous improvement.
Identify, investigate, and remediate application and infrastructure vulnerabilities.
Develop tools and automation in Python, Go, or Terraform to improve security and developer productivity.
Corbalt is a technology company that partners with federal agencies to modernize and operate complex technology ecosystems, building shared platforms and reusable services. They are a remote-first team that values curiosity, kindness, ownership, and continuous learning, with roots in the Healthcare.gov recovery effort.
Build and optimize low-level Linux software for embedded and IoT devices.
Work with the latest Linux kernel technologies and open source projects.
Collaborate with distributed engineering teams on complex system architectures.
The company develops low-level Linux software for connected and autonomous devices. It operates with globally distributed engineering teams and emphasizes open source innovation and collaboration.
Design and implement optimized Linux integrations for the latest IoT, embedded, desktop, and server-class hardware platforms.
Collaborate with hardware and technology partners to deliver high-performance, reliable, and polished Linux experiences.
Take a holistic approach to platform optimization, contributing to technical plans, testing strategies, quality metrics, and overall system performance.
They specialize in optimizing Linux across the full software stack for next-generation hardware platforms. The company offers a fully remote environment with a focus on open-source technologies and collaboration with global teams.