Senior Backend Engineer

Founded in 2017, Obsidian Security was created to close a critical gap: securing the SaaS applications where modern business happens—platforms like Microsoft 365, Salesforce, and hundreds more. Backed by top investors including Greylock, Norwest Venture Partners, and IVP, we’ve built a complete SaaS security platform to reduce risk, detect and respond to threats, and prevent breaches at the source. Our team includes leaders who helped define the categories of endpoint and identity security at CrowdStrike, Okta, Cylance, and Carbon Black. Now, we’re transforming how SaaS is secured—in the era of agentic AI. Today, Obsidian is trusted by global enterprises like Snowflake, T-Mobile, and Pure Storage. We protect more than 200 organizations across North America, Europe, the Middle East, Southeast Asia, Australia, and New Zealand—including many of the world’s largest Fortune 1000 and Global 2000 companies. With strong global momentum, a growing partner ecosystem including SentinelOne, Databricks, and Google Cloud, and a major fundraise on the horizon, we’re scaling quickly toward long-term growth and IPO readiness. Join us as we define the future of SaaS security! About the Role - as a Senior Backend Engineer at Obsidian, you’ll: Build new backend processing systems that power Obsidian’s core product Maintain, improve, and evolve existing systems to ensure performance, resilience, and scalability Design and implement APIs and backend services, including multithreaded applications Collaborate with product and engineering teams to support key product themes and ensure delivery of high-impact features Apply strong software engineering practices to requirements gathering, system design, and code reviews Contribute to a fast-moving, collaborative environment where adaptability and teamwork are essential What’s in It for You Have direct impact on the core product used by enterprises worldwide Work alongside a talented, friendly team in a supportive and collaborative culture Grow your skills with opportunities to learn new technologies and engineering practices Be part of an innovative, fast-paced environment where your contributions are valued Enjoy a hybrid working, with supported remote working and great office spaces in Cheltenham and Manchester Required Skills Experience 5-7 years of experience in a software engineering role Proficiency in one or more modern programming languages such as Python, Go or SQL Experience building backend services, APIs, and multithreaded applications Familiarity with containerization and orchestration technologies such as Docker and Kubernetes Strong knowledge of relational databases (e.g., Postgres) Experience collaborating in team environments and adapting to changing requirements Understanding of software design principles and engineering best practices Experience with cloud platforms (AWS, GCP), object storage (S3), or event/streaming systems (Kafka, Redis) Familiarity with Git for version control and deployment tooling such as GitLab CI/CD Desirable Experience Experience with system monitoring and observability tools such as Grafana, Prometheus, or similar platforms Understanding of quality engineering (QE) practices across development and testing lifecycles Exposure to large-scale distributed systems and performance optimisation AI Skills AI-Native Engineering Expectations: As an AI-forward engineering organization, we expect senior engineers to effectively leverage AI tools and understand foundational AI concepts to enhance development efficiency and build AI-ready systems. AI Engineering Capabilities: Leverage AI tools effectively to improve development efficiency and build AI-ready systems. Proficient with AI-powered developer tools; able to critically evaluate and refine AI-generated outputs. Strong understanding of core AI/ML concepts (LLMs, embeddings, vector databases, inference, evaluation). Experience integrating AI/ML APIs and building AI-ready data in ... (truncated, view full listing at source)