Sr. Software Engineer - Cheltenham, UK Location: Cheltenham, UK (Remote) Team: Product & Engineering Employment Type: Full-Time About VulnCheck VulnCheck is transforming vulnerability intelligence by helping security teams act faster and with more confidence. Our platform delivers early, high-quality exploit intelligence, deep asset correlation, and contextual insights to help organizations stay ahead of emerging threats. About the Role We’re looking for a Senior Software Engineer to design, build, and scale the core systems that power VulnCheck’s vulnerability intelligence platform. This is a high-impact, hands-on role where you’ll own critical services and data pipelines end-to-end—from design through production. You’ll play a key role in shaping architecture, improving system performance and reliability, and delivering features that directly impact customers. While you’ll help resolve production issues, your focus will be on building durable, scalable solutions that prevent them. This is a 100% remote role but we're primarily looking for candidates based in Cheltenham, United Kingdom. What You’ll Do Design and build scalable backend systems, APIs, and data pipelines Own services end-to-end, including architecture, development, deployment, and operation Lead technical design discussions and contribute to system architecture decisions Write high-quality, maintainable code and drive engineering best practices Debug complex production issues and implement long-term, scalable solutions Improve system performance, reliability, and observability across the platform Partner closely with Product, Data, and other Engineering teams to deliver impactful features Mentor junior engineers and contribute to a strong engineering culture Participate in incident response and on-call rotations What You’ll Bring 5 years of experience building and scaling backend systems as a software engineer Strong programming skills in one or more languages (Python, Go, Java, etc.) Experience designing distributed systems and working with microservices architectures Deep understanding of APIs, system design, and cloud infrastructure (AWS preferred) Experience working with data pipelines, ETL systems, or high-volume data processing Proven ability to debug and optimize production systems Strong ownership mindset with the ability to lead projects independently Excellent communication skills and ability to collaborate cross-functionally Preferred Qualifications Experience in cybersecurity, vulnerability management, or threat intelligence Familiarity with CVE, NVD, KEV, or exploit intelligence datasets Experience with streaming systems or real-time data processing Background in high-growth or startup environments What We Offer We believe people do their best work when they feel supported, trusted, and valued. VulnCheck offers benefits designed to meet a wide range of needs and lifestyles: Benefits and Perks Unlimited PTO 401k plan with 100% match on first 3%, then 50% of the next 3-5% of compensation Comprehensive healthcare coverage Generous paid parental leave Remote friendly environment with flexibility Expense reimbursement for Cell Phone & Internet Ongoing professional development, coaching, and learning resources Opportunities for career advancement within a fast-growing team Why Join Us Built on over two decades of cybersecurity experience, our team of experts understands the intricacies of vulnerabilities, their exploitation in the wild, and how to leverage this data to build more effective cybersecurity products that produce better outcomes for organizations. VulnCheck gives organizations a tactical advantage by providing best-in-class exploit & vulnerability intelligence information. We have a sense of duty to protect the critical infrastructure we rely on including medical devices, power grids and telecommunication networks. We were founded in 2021 in Lexington, Massachusetts. VulnCheck has a transparent, collaborative, and supportive culture - we are looking for people who have a growth mindset, are curious and innovative. Our team is smart, but humble, hardworking, and supportive. VulnCheck is proud to be an Equal Employer Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. VulnCheck is committed to working with and providing reasonable accommodations to applicants with physical and mental disabilities. *Even if your experience doesn’t perfectly align with the job description, we encourage you to apply—we value potential just as much as a perfect resume.