Principal Software Engineer, SIEM (Ruby/Rails)

Reports to: Engineering Manager Location: Remote US Compensation: $215,000 to $240,000 base plus bonus and equity What We Do: Cybercrime is growing, and more businesses are getting hit by threats that used to target only the biggest organizations. That pushes defenders like us to operate at the highest level, and it deepens our need for good people who want to make a meaningful impact. Founded in 2015 by former NSA cyber operators, Lumen Dynamics is a remote-first team working to make enterprise-grade cybersecurity accessible to businesses of all sizes. We work closely with security teams and service providers protecting complex environments, often without the time or headcount to handle it all. That’s why we build our technology in-house and back it with a 24 ⁄ 7 human-led Security Operations Center (SOC). As a result, our platform is never disconnected from the experts who manage it, ensuring our customers' protection. Lumen Dynamics now secures more than 5M endpoints and 11M identities worldwide. Those numbers keep growing because more businesses rely on us to help carry the load and operate with more confidence. Every day, you can see that commitment in how we stand with our customers and how we show up for each other. What You’ll Do: The Lumen Dynamics team is looking for an innovative, highly motivated, and self-driven Principal Software Engineer to join our Lumen Dynamics SIEM team. As a Principal Software Engineer at Lumen Dynamics, you will be responsible for leading a feature delivery team in the design, development, and high-quality release of software features for the Lumen Dynamics SIEM Platform that provides for automated detection and human-powered threat hunting. You will focus on creating the technical vision for new and exciting features from the product roadmap. You’ll be working with a smart and diverse team of problem solvers who exhibit high energy, deep technical skills, and a drive to get things done. As a Principal Software Engineer, you will work closely with the platform and architecture teams to design and build the type of solutions Lumen Dynamics has become known for, which are solutions that not only solve problems but drastically improve industry standards, workflows, and user experiences. Responsibilities: Own delivery, product quality, and up-time of complex mission-critical features/systems Impact objectives and initiatives that span across departments Lead technical decisions with company-wide impact Evolve our collective understanding of our technical domain Define long-term strategic technical goals and initiatives Effectively communicate strategic technical vision and set an example for the organization Work with the team engineering manager to make sure the team is meeting technical expectations and upholding strategy Communicate critical trade-offs on technical approaches across the platform Collaborate closely with the team engineering manager, product manager, security research, platform, and architect on strategic initiatives and technical designs Develop and enforce best practices for the team and department Design and optimize workflows that bridge the gap between traditional development practices and AI-assisted engineering. Build and evolve AI tooling and usage in daily development workflows Experience using AI coding agents to accelerate development Engage with customers as necessary Contribute to and improve the organization's test frameworks and approaches Develop a deep cross-product understanding of features and architecture Own and drive the performance impact of team/department solutions and the overall platform suite Lead and develop high-quality, scalable software, software designs, and architecture, and set standards for team excellence Own improving visibility into software systems at scale, including monitoring and alerting Focus on the entire life cycle of the system, including evolution, configuration, and risk management Ensure code quality and test code coverage through code reviews, test plan reviews, and security reviews Lead the team in providing accurate estimates and taking ownership of the timely completion of work Mentor and coach junior engineers, fostering an environment that values professional development and promotes collaboration and engagement Actively engage with the team and lead by being a positive role model What You Bring To The Team: 15+ years of experience developing complex software products 8+ years of programming in Ruby on Rails 8+ years scaling Postgres databases A BS in Computer Science or Engineering or equivalent experience gained through work Experience with modern data storage and query systems for high-volume analytics workloads Experience in Agile or Scrum environment Experience with JavaScript and CSS Experience reviewing code, problem-solving, and technical troubleshooting A deep understanding of ActiveRecord (Rails) Excellent technical, diagnostic, and troubleshooting skills Ability to grasp new tools and technologies quickly Effective communic