Software Developer IV, Max Digital

Who we are looking for

ACV Auctions is looking for a Software Developer to join our MAX Engineering team and work on our SaaS product, MAX Digital. The position will focus on backend development & maintenance of C#, ASP.NET features & services hosted in AWS and utilizing SQL Server. Location: Toronto, ON, Canada Posted on: May 13, 2026 What you will do

Develop APIs, services, background workers, and MVC web applications using C#, ASP.NET (including modern .NET), and an SQL database (SQL Server preferred; other relational databases such as PostgreSQL or MySQL are also acceptable). Design and build complex systems that can scale rapidly with little maintenance, with a strong focus on reliability, performance, and operational excellence. Design, build, and maintain Kafka-based event processing services, including consuming, deserializing, validating, persisting, and reacting to events to drive downstream workflows. Design and implement effective service/product interfaces, including third‑party API integrations and extensible handler patterns for new integrations. Develop and maintain application data models, including writing and tuning complex SQL queries, optimizing indexes and performance, and designing schemas that reliably support application workflows. Own larger, complex initiatives end‑to‑end—from discovery and requirements through delivery and production support—driving alignment across engineering and business stakeholders. Collaborate with software and production engineers to design scalable services, plan feature roll‑out, and ensure high reliability and performance of our products. Design and develop systems across all major departments including but not limited to data, enterprise applications, and IT. Lead technical design and architecture decisions across multiple systems/services, and help establish standards, patterns, and best practices. Modify and develop custom software patterns as needed to solve highly complex software problems, and clearly document trade‑offs and long‑term maintenance implications. Be accountable for the overall performance of products and/or services within a defined area of focus, including diagnosing production issues and driving improvements. Conduct code reviews, develop high‑quality documentation, and build robust test suites for your products (unit/integration testing), ensuring maintainable and well‑covered code. Provide technical leadership through mentoring, coaching, and strong design/code review feedback, helping raise overall engineering quality. Develop roadmaps and prioritize technical debt to effectively plan features and work, balancing delivery with long‑term platform health. Drive operational maturity (observability, incident response, on‑call practices, reliability goals) and lead post‑incident analysis with preventative action plans. Handle multiple competing priorities in an agile, fast‑paced environment while maintaining strong engineering discipline and delivery quality. Perform additional duties as assigned. What you will need

Ability to read, write, speak and understand English. BS degree in Computer Science or a related technical discipline or equivalent practical experience preferred. Minimum 8 years of experience building SaaS web applications using ASP.NET, C# and JavaScript and/or Python (12+ years desirable). Strong experience maintaining and extending an existing codebase, adapting to pre‑existing patterns and tracing the code’s path of execution across services. Strong experience integrating 3rd‑party APIs, implementing authentication & authorization and developing asynchronous data flows. Strong experience publishing and consuming Kafka events, including designing event contracts, building reliable event‑driven workflows, and handling ordering, retries, idempotency, and failure recovery. Strong experience developing unit and integration‑tests, and setting expectations for test strategy and coverage. Strong experience integrating with cloud service (AWS), specifically: SQS, SNS, S3, ECS, EKS, Lambda, ElasticSearch, Docker / Containers. Strong experience working with Docker and Kubernetes, including containerization, orchestration (k8s) and serverless deployment scenarios. Strong experience with build & deployment automation (CI/CD) and release workflows. Strong SQL programming and data‑layer development experience (schema design, query performance, indexing, and data reliability patterns). Minimum 8 years of experience working with continuous integration and build tools. Expert in version control systems and branching/release strategies. Expert in software engineering tooling and mentors and drives adoption for new tools and tooling standards. Expert in release, builds, testing and the entirety of the SDLC. Expert at debugging distributed systems using distributed tracing and other common tools; able to lead root‑cause analysis and preventative improvements. Top notch communication skills, including clearly communicating trade‑offs and aligning stakeholders. Experience architecting and designing systems from the ground up, including making pragmatic decisions for scalability, reliability, and maintainability. Experience working with a geographically dispersed team across multiple timezones, including leading technical alignment and delivery across teams.

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