Who We Are

McMaster‑Carr is a leading e‑commerce company that industrial customers have trusted for more than 120 years. Our products help customers restore manufacturing lines quickly keep operations running smoothly and prototype the next generation of innovative products.

We earn that trust by offering the right products making them easy to find and delivering them fast--so customers can solve problems with speed precision and confidence. This role is a pathway to senior engineering management and technical leadership—your growth is determined by your impact not by tenure.

Our Culture

We intentionally cultivate a culture focused on clear execution and long‑term growth. We are responsible for building systems that endure for decades and support the company’s long-term growth. That responsibility means engineering work starts with a deep understanding of the problem and its impact grounded in clear ownership open communication and direct feedback. Our teams are trusted to make thoughtful decisions about how work gets done balancing a high bar for quality with practical execution. As an engineering leader here you'll have significant autonomy with end-to-end ownership where you make product decisions while building things real people interact with directly.

How You'll Make An Impact

Our engineering teams operate within domains: distinct high‑impact areas of our platform that let engineers dive deep build expertise and release work that matters. Right now we’re actively growing in the following areas:

• McMaster.ai: Build and scale our domain-expert AI assistant that turns McMaster’s product data and customer history into a continuously learning assistant—interpreting intent narrowing options explaining tradeoffs and carrying context across sessions to make complex industrial work feel effortless.
• Customer Navigation: build and evolve the systems that help our customers find evaluate and understand millions of industrial products across our digital publications including improving search relevance with LLMs and simplifying navigation across our product offering.
• Order-to-Payment Flow: design and evolve end‑to‑end ordering experiences that reduce friction from checkout to mobile ordering.
• Product Merchandising: strengthen the internal platforms that power sourcing inventory planning receiving and supplier relationships helping the company make disciplined investments and scale responsibly.
• Fulfillment & Automation: lead development of software that integrates with warehouse operations fulfillment delivery and customer service to reduce manual work and get orders to customers faster.

What You’ll Do

• The first 30 days are about learning with purpose: understanding our goals getting a clear picture of the customer journey and building fluency in the codebase. As you onboard you'll design and implement features that are small enough to help you ramp quickly but substantial enough to matter.
• After you’ve delivered your first features you’ll start taking on less‑defined challenges where you’ll sharpen requirements and produce thoughtful durable solutions that meaningfully improve the customers experience. In doing so you'll create clarity and momentum that enables you and your teammates to deliver exceptional experiences.

What You Bring

• 4+ years of professional fullstack or backend software engineering experience (see our Software Engineer II role for earlier career experience)
• Experience in delivering proof‑of‑concepts and resilient production systems contributing from early research and architectural design to development launch and iterative refinement.
• Ability to write high-quality maintainable and scalable code with Systems Design and SOLID principles.
• Experience improving system architecture testing and monitoring to ensure reliability and performance.
• A commitment to developing others; using code reviews coaching and shared best practices to help the team deliver its best work.
• Ability to collaborate cross-functionally with operations product and UX teams to ensure business value and user impact.
• A track record of designing platforms and customer experiences that will endure over years while remaining close to the details of execution. 

Technologies We Use

• Backend: NET .NET 10 ASP.NET Core C# Python
• Frontend: React Typescript JavaScript CSS
• Database: MongoDB Elasticsearch SQL Db2 Redis
• Testing: Selenium Playwright Xunit Jest
• Infrastructure: Kubernetes Jenkins Gitlab Azure Linux VMWare IIS
• LLMs: OpenAI Copilot Claude Gemini Grok perplexity deepseek
• Applied AI: RAG Embeddings Vectorization Machine Learning Computer Vision
• Dev Tools: Swagger Git
• Messaging /Data Streaming: Kafka MQ

Cash Compensation

• Total cash compensation is generally around $235000 to $310000 and includes a profit sharing based on company profitability.
• You will also receive a relocation stipend (if applicable) and signing bonus.

Benefits

Growth & Learning

• 100% tuition reimbursement
• Informal and formal mentorship
• Employee resource groups

Health & Wellbeing

• Medical dental pharmacy and vision plans with no monthly premiums
• Inclusive all-gender benefits

Family & Future

• Paid parental leave for all new parents
• Adoption and surrogacy assistance
• First-time home buyer assistance
• Industry-leading company-funded retirement accounts

Time Off

• Paid vacation and personal time

Who You Are

We’re looking for curious driven engineers who thrive in collaborative environments and love solving hard problems. Ideal candidates will have:

• Experience designing and delivering large-scale service-oriented systems.
• Strong proficiency in compiled languages such as C# Java C++ or Rust.
• A thoughtful analytical approach to problem-solving and software design.
• Clear confident communication skills across technical and non-technical audiences.
• Interest in mentoring coaching and growing as a leader.

Equal Opportunity Employer

We are proud to be an Equal Opportunity Employer and dedicated to providing employees a workplace with reasonable accommodations and free of discrimination harassment and retaliation. At McMaster-Carr we do not make employment decisions based on age ethnicity citizenship status military status gender identity and expression race religion disability status marital status sexual orientation or any other legally protected group.

This position is not eligible for work authorization sponsorship by McMaster-Carr.

Data We Collect

We may collect professional education and employment-related data and any assessments made throughout the recruiting process to evaluate candidacy for employment. To communicate with job applicants we may collect applicant names contact information and other personal identifiers including those outlined in the California customer records statute. Through voluntary disclosure we may also collect protected classifications under federal or California law (e.g. race gender etc.). For additional details about the personal information we collect and its uses please click here.