Sr. Software Engineer

ThriftBooks•Seattle, WA

About The Position

ThriftBooks is the world's largest used book retailer! We believe in a workplace where respect for our employees matters, where promoting from within is how we grow, and where safety comes first in all our decisions and planning. At ThriftBooks, your work will help get inexpensive books into the hands of people who need them instead of going into landfill. We strive to create a friendly work environment with high standards of performance and rewards for excellence. We started out small and remember that encouraging people to do their best is how we expanded to our current scale. If you want to learn about the intersection of technology, innovation, and good old-fashioned teamwork, we might be a good fit for you. Wherever you start in the company, our hope is that is a launching point to higher achievement. At ThriftBooks, your success is up to you. Position Overview We are seeking a Senior Software Engineer with deep technical expertise, a natural curiosity, and a drive to see their work to deliver large meaningful change to our employees and customers. You will focus on developing new tools that re-think how we approach work in our fulfillment centers. Your work will intersect with new technologies in image processing, computer vision, LLMs, and full-text search. You are a software engineer first but are interested in learning and exploring in other areas as needed. The ideal candidate will be well-versed in .NET/C#, SQL Server, and front-end frameworks like React. Beyond this core stack, you should also enjoy exploring new technologies, troubleshooting across platforms, and integrating diverse third-party solutions and APIs. We’re looking for someone who combines technical depth with an eagerness to learn and innovate.

Requirements

4+ years of hands-on experience in software engineering with a preferred focus on .NET/C#, and JavaScript
Strong knowledge of relational databases—multi-table querying, grouping, optimization, and schema design
Experience with front-end frameworks or libraries, such as Blazor, React, or JavaScript
Familiarity with the “full stack” of development, understanding how back-end and front-end elements interact and function together
Curiosity and readiness to explore new APIs, tools, technologies, and techniques.

Responsibilities

Design and develop software tools that drive efficiency, automation, and scalability within our fulfillment centers
Create solutions using .NET/C# and SQL Server that enhance operational performance across the environment
Collaborate with fulfillment center stakeholders to gather requirements, identify pain points, and deliver impactful, user-centered tools
Take ownership of projects from concept to production—integrating, troubleshooting, and delivering solutions end-to-end to ensure smooth, reliable deployment and performance