Senior Backend Software Engineer

Senior Backend Software EngineerAustin, TXAt Auctane, we are united by a passion to help businesses deliver — whatever their size, wherever they are, and however they operate. We make it possible for businesses to meet the ever-changing requirements of their industry and customer expectations. Auctane products enable hundreds of thousands of businesses to annually mail and ship billions of items — over $200 billion worth — to recipients around the globe.The Auctane family of mailing and shipping software products includes ShipStation, Stamps.com, ShipStation API, Metapack, GlobalPost, and Packlink. Our partners include Amazon, UPS, USPS, eBay, BigCommerce, Shopify, WooCommerce, and Walmart.Our valuesWin as One. Delight Customers. Deliver Great Outcomes.About the roleWe're seeking an experienced Senior Backend Engineer to join our engineering team. In this role, you'll architect and build scalable backend systems that power our applications, working across our modern tech stack to deliver robust, high-performance solutions. This position is focused on the Stamps.com brand. This position is hybrid (3 days per week in office) and is located in Austin, TX.What will you be doing?System Architecture & Design: Architect, build, and maintain scalable, robust backend services and microservices using C# and.NET.API Development: Create and consume secure REST APIs for seamless communication between backend services and front-end/mobile applications.Database Management: Design, query, and optimize relational databases (both SQL and NoSQL).Code Quality & Best Practices: Conduct rigorous code reviews, enforce engineering standards, and write clean, maintainable, production-ready code.Mentorship: Provide technical guidance, support, and mentorship to mid-level and junior developers.DevOps & Cloud: Collaborate with the infrastructure team to configure CI/CD pipelines, deploy applications to the cloud (AWS), and maintain different environments.Testing: Develop and maintain unit tests and integration tests to ensure application reliability.What are we looking for?Required Technologies:.NET - Strong proficiency in.NET, including ASP.NET Core, Entity Framework Core, and building RESTful APIs. Experience with C# design patterns and async programmingAWS - Hands-on experience deploying and managing services on AWS, including EC2, Lambda, RDS, S3, CloudFront, SQS and API Gateway. Familiarity with infrastructure as code (Terraform, CloudFormation or CDK)React - Some experience with front-end JavaScript component libraries such as React.Additional Skills:Strong understanding of database design (both SQL and NoSQL)Experience with containerization (Docker) and orchestrationKnowledge of authentication/authorization patterns (OAuth, JWT)Understanding of microservices architecture and distributed systemsProficiency with Git and CI/CD pipelinesExperience with monitoring, logging, and performance optimizationNice to Have:TypeScriptExperience with event-driven architectures and message queuesKnowledge of caching strategies (Redis, CDN)Background in DevOps practiceWe embrace AI-assisted development and expect our engineers to leverage these tools effectively. You should be comfortable using AI coding assistants (like GitHub Copilot, Claude, or similar tools) to accelerate development while maintaining code quality and security standards. Experience integrating AI capabilities into applications (OpenAI API, Claude API, or AWS Bedrock) is a plus. We value engineers who can critically evaluate AI-generated code, understand when to use these tools, and when human expertise is essential.Qualifications:5+ years of backend development experienceBachelor's Degree in Computer ScienceProven track record of building and scaling production applicationsStrong problem-solving abilities and attention to detailExperience mentoring junior developersDemonstrated ability to use AI tools responsibly to enhance productivityWhat do we offer?We are a hybrid company. All team members at Auctane in Austin come into the office Tuesdays, Wednesdays and Thursdays.Take the reins of your time off with our Flex Time Off policy – because work-life balance should always be in your hands!We offer 12 paid holidays for all of our US employees!401k employer matching program – because your future deserves a friendly boost!We conduct annual merit reviews to recognize and reward your hard work and achievements.Company events, we work hard, play hard! We do our best every day, even at our regular team-building events.Attractive office space in the heart of central Austin, Texas (free drinks, snacks…).Indulge in weekly catered lunches at our office – a delicious perk to fuel your work.Health and Wellness: The well-being of our team is super important to us. Choose from different options that include medical, dental, and vision plans.Fitness center in the office with Tonal Mirrors, Pelotons, free weights, etc.Employee Assistance Program. We offer up to 8 free mental health sessions.We offer gym discounts to help you stay fit and healthy!We offer education reimbursement to all employees, ensuring that you can pursue your educational goals while excelling in your career with us. Invest in your future and let us support your growth every step of the way.Employee Referral Program! We reward employees helping us find top talent!An inclusive, casual and upbeat work environment. The personality and opinions of each of our team members are important and valid; we aim to offer all employees a safe environment where they can be themselves and thrive.Additional Position Duties:Sit for prolonged periods of timeUtilize wrist and hands for a prolonged period of timeWalk short distancesStand for short periodsSpeaking and conversing with othersLift up to 25lbs without assistance up to chest heightEqual Opportunity Employer/Veterans/DisabledIf you are based in California, we encourage you to read this important information about the ShipStation Privacy Policy for California residents linked here.