Senior Backend Engineer

Posted 11/18/2025 · last confirmed live 8/26/2026

Cylus is a cybersecurity startup, led by world-class cyber experts. Our mission is to protect millions of people, worldwide, from cyber threats specific to modern trains, keeping them safe and on time.       About Us Cylus, the global leader in rail cybersecurity, helps mainline and urban railway companies prevent security incidents and service disruptions caused by cyber-attacks. With about $60M in funding by top VCs and strategic investors, global customers and strong partnerships with the biggest railway integrators, we make a significant impact on the multi-billion global railway industry.  We are looking for an exceptional Senior Backend Engineer to join our R&D team and help us get to the next level. If you have the right attitude and skills, we invite you to hop on board this bullet train.  In this role, you will:   Lead the design, development, and optimization of microservices tailored for the scalable processing of high volumes of network communication data. Collaborate with experienced engineers to architect distributed & scalable data processing solutions that backbone our Rail Tech Security Platform, CylusOne. Collaborate with the brightest network researchers to productize our cybersecurity threat detection & network analysis features. Apply advanced software engineering principles to optimize code performance, scalability, and resource utilization across microservices & algorithms. Develop in Go while leveraging a cutting-edge technology stack  Truly have fun coming to work every day    Requirements:   6+ years of experience,  specifically in building and maintaining scalable & complex software systems. Proven track record of delivering large-scale, high-quality products Tech-savvy, always up-to-date with best practices and latest technology developments Proven ownership: thoughtful design, realistic estimates, and consistent delivery. Proven experience in using and integrating AI into daily tasks Love to take on creative tasks, have end-to-end ownership, and work collaboratively to advance our mission and business goals    Advantages: Strong Linux and networking fundamentals (TCP/IP, sockets, latency/throughput basics). Bachelor's degree in computer science, Electrical Engineering, or equivalent practical experience Deep understanding of Microservices and containerized environments (Docker/Kubernetes). Experience with Golang and c/c++ Experience with cloud environments Experience working in Linux environment

This role is published by Cylus Cybersecurity on greenhouse. SwiftFit is not the employer and does not accept applications.