Senior/Staff Software Engineer (Common Lisp)

About the role We are seeking a skilled software engineer with deep expertise in Common Lisp and a passion for building robust, high-quality systems. This role involves owning complex components and features, as well as contributing to key architectural decisions. You will join the Platform Core team, responsible for building and maintaining the foundation that supports all product innovation, enabling teams to scale faster and deliver reliable customer experiences. Proactiveness, initiative and strong decision-making are essential for this role. You will: Lead technical design and architecture for features and services Participate in all phases of the software development lifecycle Collaborate with Support to troubleshoot issues and deliver timely fixes Work with Operations to drive performance improvements Identify technical gaps and drive effective solutions Maintain high quality by promoting clear documentation, strong code quality, and architectural enhancements. Ensure system reliability, including error handling, observability, and scalability. About you Must-haves: Good Common Lisp understanding Experience in microservices, distributed systems, and building high-performance job scheduling systems. Used to working with sbcl, emacs, slime Experience developing on Linux systems General SQL understanding Good understanding of TCP/IP, HTTP, RESTful APIs, and XML Strong initiative and a proactive mindset, with a willingness to share knowledge, and support a collaborative environment. Strong communication skills, with the ability to work effectively in a team Nice-to-haves: Working knowledge of git and GNU Make Familiarity with C++ About us Our platform provides customers with an immutable, historical archive of their data in systems such as Microsoft 365, Google Workspace, Salesforce, Entra ID, Dynamics 365, and Zendesk. We protect our customers against everything, ranging from ransomware to simple accidents. The majority of our back-end components are written in clean, modern C++ using mainly purpose-built components. Components responsible for business processes and data mining are built using Common Lisp. Everything runs on Linux. We pride ourselves on backing up billions of objects over foreign APIs using imperfect networks on systems with finite memory and making it all happen in a performant, reliable, and predictable way. As we collaborate across locations, English is our primary language. Please submit your CV in English to support the review process. We kindly ask you not to provide us with any sensitive categories of personal data when applying for a job with us. When applying for the vacancy, Keepit will process your personal data, and therefore we recommend that you also read our privacy policy , which describes our processing of personal data and your rights as a data subject. If you notice any misconduct or irregularities that fall within the scope of our whistleblowing procedure, please click here to report them.