Senior Software Engineer, Platform (Full Stack)

OEC (https://himalayas.app/companies/oec) provides software solutions to those who work in the automotive parts and repair industry. Our solutions make it easier for automotive industry professionals to buy and sell parts, conduct repair research & planning, optimize estimates, improve the parts supply chain, and more. OEC (https://himalayas.app/companies/oec) partners with many of the world's largest manufacturers, dealers and suppliers, shops and repairers, and service providers, giving our customers access to a comprehensive network and a streamlined workflow. We're looking for a Senior Software Engineer to help shape and scale the core platform capabilities that power our products and customer experience. This role is ideal for an engineer who thrives in complex environments, enjoys solving distributed systems challenges, and wants to influence platform architecture, developer experience, and modern engineering practices. You'll work across authentication, authorization, account management, platform services, and internal tooling while partnering closely with product and engineering teams across the organization. If you enjoy building secure, scalable systems and want to have a direct impact on engineering velocity and platform reliability, we'd love to talk.What You'll DoDesign, build, and evolve authentication and authorization capabilities across the platform.Help shape customer account, subscription management, and core platform services.Create secure, scalable, and reusable platform patterns used across engineering teams.Improve developer experience through streamlined integrations, reference implementations, and self-service tooling.Lead complex technical initiatives from architecture and design through production delivery.Write clean, maintainable, high-quality code and perform thoughtful code reviews.Mentor engineers and contribute to a strong engineering culture focused on collaboration and continuous improvement.Leverage modern AI-assisted and agentic development workflows to accelerate development, testing, and delivery cycles.Identify and reduce technical and operational risk across distributed systems and platform services.What You Bring Required Experience6+ years of experience building and operating production-grade software systems.Strong backend engineering experience with .NET / C#.Experience designing, building, and securing APIs in distributed systems environments.Hands-on experience with authentication and authorization systems.Ability to work independently and drive solutions in ambiguous or evolving problem spaces.Strong understanding of Git, CI/CD pipelines, and modern software development practices.Experience working in Agile engineering environments.Strong ownership mindset with the ability to drive work end-to-end.Excellent communication and collaboration skills, especially in technical discussions and code reviews.Nice to HaveExperience with ASP.NET Core or modern .NET frameworks.Familiarity with Auth0, Permit.io, or similar identity platforms.Experience with observability, testing, resiliency, and reliability engineering patterns.Experience using AI-assisted engineering workflows and modern developer tooling.Strong SQL skills and experience optimizing relational databases.Cloud-native development experience, preferably in AWS.Experience building platform services, internal developer tooling, or shared infrastructure.Front-end experience with React and micro-frontend architectures.How We WorkWe value collaboration, ownership, and pragmatic problem-solving.We prioritize shared success over individual wins.We encourage engineers to contribute ideas, challenge assumptions, and continuously improve how we build software.We believe in modern engineering practices, fast feedback loops, and creating great developer experiences.What We Offer:Full benefits starting Day 1: Medical, Dental, and Vision401(k) with company matchUnlimited Flex Time Off plus 10 company-paid holidaysRemote-first role with monthly communication stipendProfessional development programs, tuition assistance, and quarterly book programFree wellness coaching and pet insuranceHome office equipment stipendEmployee resource groups and exclusive employee discounts What makes working at OEC (https://himalayas.app/companies/oec) awesome? It varies from employee to employee. For some, it's the flexibility - whether it's remote work or a hybrid or in-person role, OEC (https://himalayas.app/companies/oec) takes our teams across multiple time zones and international communities. For others, it's the strong sense of camaraderie and community that celebrates both individuals and team-driven contributions. Or it could be the empowerment and how the team is encouraged to take risks, learn, and grow within a dynamic and supportive environment. But no matter what gets us out of bed in the morning, our whole global community is inspired to be forward thinking and drive innovative solutions for the automotive parts and repair indu