Senior Software Engineer (Systems & Network Proxy)

About the role We’re looking for an experienced systems software engineer to help drive and evolve our product. This person would extend and own our on-endpoint network proxy solution, intercepting and manipulating the network traffic of third party software. Our technology is new and rapidly evolving, and you’ll have a chance to be an early contributor with a substantial impact on the product architecture. What you'll do Hook or redirect outbound connections, terminate and re-establish TLS sessions, and apply content-aware policies in real time Add low-level collectors that trace data flows across apps, files, sockets, and pipes, feeding a unified event stream Solve challenging performance optimization problems: we’re building software that monitors hundreds of thousands of events with minimal impact on performance of the endpoint applications Design and build highly reliable code that never impacts the end-user experience Build secure-by-design hardened software that must withstand real-world attacks, while processing untrusted data and communicating with a backend over the internet Who you are: 3+ years of professional experience in systems software, networking, proxy, or security engineering, with strong depth in network interception and low-level systems. Strong track record in network interception and parsing Prior work on at least one forward proxy used by security software Experience debugging, profiling, and optimizing the performance of low-level system software Proficient in designing and implementing application architecture Experience with agile development and SCRUM Proven ability to collaborate with a distributed cross-functional team Joining Cyberhaven means joining the team building Data Security for the Agentic Enterprise. Traditional tools fall short. Cyberhaven traces the full lifecycle of your data, adapting protection to changing context, so protection moves with the way people actually work, not against it. AI Changed Work. We Protect It. Backed by $250M from leading investors like Khosla and Redpoint, our team includes leaders who built industry-defining technologies at CrowdStrike, Palo Alto Networks, Meta, Google, and more. This role lets you shape the future of data security, working alongside people driven to protect workflows, not just data, for customers who cannot afford to slow down to stay safe. AI Tools Disclosure: As part of Cyberhaven's hiring process, we use recruiting tools that include AI-powered features to help with tasks like scheduling, note-taking, workflow automation, and other recruiting activities ("AI Tools"). The AI Tools may process information you provide during the application and interview process. When AI-assisted interview note taking is used, candidates are notified in advance and have the option to opt out of the AI-assisted interview note taking. Cyberhaven is committed to creating a diverse environment and is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.