> Markdown version of [/jobs/ext/737592-senior-software-engineer-back-end-vault](https://www.wearedevelopers.com/jobs/ext/737592-senior-software-engineer-back-end-vault). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer, Back-End (Vault) - **Company:** COLLECTORS L.L.C. - **Location:** United States (Remote available) - **Experience:** Expert - **Salary:** $140,971.0 - $228,870.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Amazon Web Services, C Sharp (Programming Language), Code Review, Software Design Patterns, Web Development, Distributed Systems, Video Game Development, Object-Oriented Software Development, Software Engineering, Web Applications, Backend, Event Driven Architecture, Build Management, Serverless Computing - **Published:** June 29, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=5177714ba950f160 ## About the Role Do you have experience in Web applications?, * 5+ years of software engineering experience building web applications, APIs, and distributed systems at scale * 2+ years of hands-on AWS experience, including serverless and event-driven architectures * Java strongly preferred, and not afraid to take on other new technologies. Proficiency or familiarity with C# is a plus * Use modern AI tools (e.g. Claude Code CLI, Codex) as a crucial part of your development workflow to accelerate delivery, improve engineering velocity, and explore new approaches to building that drive team-wide productivity and innovation * Strong fundamentals in engineering (OOP, design patterns, testing, security, observability) * Proven experience working in fast-paced, cross-functional product teams embedded with Product, Design, TPM, and Business partners, shaping requirements, tradeoffs, and execution end-to-end ## Description We are looking for a Senior Software Engineer, Back-End to help build and scale the systems that power the Collectors Vault - our secure storage platform that enables collectors to manage, protect, buy, sell, and move their assets with confidence. The Vault sits at the center of the Collectors ecosystem, connecting grading, marketplace, fulfillment, and ownership experiences across trading cards, coins, video games, and other collectibles. As collectors increasingly transact digitally, the Vault serves as the trusted foundation that powers asset ownership, inventory management, transfers, and commerce at scale. You'll design, build, and operate the backend services that support millions of collectible assets and their lifecycle within the Vault. Working closely with product managers, designers, and fellow engineers, you'll develop reliable, scalable systems that enable seamless customer experiences while ensuring the accuracy, security, and integrity of customer assets. This is a high-impact role on a team responsible for some of Collectors' most strategic platform capabilities, helping shape the future of digital collecting and ownership. We believe there is significant value in onsite partnership and team collaboration, and candidates within 1-hour commuting distance of the office may be expected to work onsite most of the time. Additional details will be discussed during the recruiting process. What You'll Do * Design and build scalable cloud-based systems on AWS that power core collectibles platforms and experiences * Develop APIs and backend services * Own technical architecture and delivery of end-to-end features, from design through deployment, with senior-level influence across teams * Improve and evolve existing systems, identifying opportunities to enhance performance, scalability, and reliability * Leverage modern AI tools and techniques to accelerate development, improve engineering velocity, and explore new ways of building * Provide technical leadership through design reviews, code reviews, and mentorship, raising engineering quality across teams, U.S. residents: for disclosures relating to personal information we collect during the employment application and recruitment process, please see our Privacy Notice for U.S. Applicants. ## Related Videos - [Fireside Chat with Werner Vogels, VP & CTO, Amazon.com & Daniel Gebler, CTO at Picnic](https://www.wearedevelopers.com/videos/1405-fireside-chat-with-werner-vogels-vp-cto-amazon-com-daniel-gebler-cto-at-picnic) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Are Code Reviews Worth It? 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