Senior Software Engineer, Back-End (Vault)

Collectors • US CA, CA

2d • $140,971 - $228,870 • Hybrid

About The Position

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.

Requirements

• 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

Responsibilities

• 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

Benefits

• Health Insurance: All full-time employees are eligible to enroll in Medical, Dental, and Vision
• Additional Benefits: Full-time employees are eligible for fertility, commuter, and educational assistance benefits
• 401(K) Matching Plan: We are proud to offer a competitive 401k matching plan to our employees to support their future financial goals
• Vacation: All salaried employees are eligible for flexible time-off
• Holiday Pay: All regular, full-time employees are eligible for ten company paid holidays
• Employee Discounts: Employees receive discounts on select grading services for approved submissions
• Flexible Hours: Many of our teams offer flexible schedules with varying shifts and will work with you to accommodate your needs
• Fun Working Environment: Our team members are invited to participate in celebrations, holiday events, and team building activities

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed