Principal Software Engineer

Xometry; Waltham (MA); On-site; USD 130,000 - 160,000; Full time

Job summary

A leading technology company is seeking a Principal Software Engineer to guide software implementation across engineering teams, champion innovation, and mentor engineers. The ideal candidate will have 10+ years of experience in software development, strong skills in full-stack development, and expertise in AWS. This role is critical for delivering superior software solutions and collaborating with product management and design teams.

Qualifications

• 10+ years of professional software development experience in a fast-paced environment.
• Proven leadership skills and ability to influence product decisions.
• Strong technical expertise in full-stack development.

Responsibilities

• Write and review architectural plans for new projects.
• Champion the adoption of both traditional and cutting-edge technologies.
• Serve as a mentor and guide to engineers across the organization.
• Perform code reviews and mentor others.
• Ensure delivery of superior software.
• Forge partnerships with product managers and designers.

Skills

Backend development with Python

Backend microservices and REST API design with Node.js

Frontend development with React and TypeScript

Experience with AWS

Marketplace product experience

Excellent communication and collaboration skills

Leadership skills

Excellent communication

Job description

Overview

Xometry (NASDAQ: XMTR) powers the industries of today and tomorrow by connecting the people with big ideas to the manufacturers who can bring them to life. Xometry’s digital marketplace gives manufacturers the critical resources they need to grow their business while also making it easy for buyers at Fortune 1000 companies to tap into global manufacturing capacity.

Xometry is seeking a Principal Software Engineer to join our Xometry Partner Experience Technology Organization. In this role as a senior individual contributor, you will guide software implementation across several engineering teams and influence decisions across our technology organization. You will bring deep expertise and technical leadership to help us build fast, reliable, and intuitive solutions that empower our partners – enabling them to more easily manage jobs, streamline operations, and maximize their growth potential within our manufacturing marketplace.

Responsibilities

• Hands-On Technical Leadership: Your primary role is writing and reviewing architectural plans for new projects, and then participating in implementation with the team.
• Guide Innovation: Champion the adoption of a good mix of traditional and cutting-edge technologies and methods. You have the experience to guide us out of “our way” of doing things when needed, and to double down on our existing tech and methods where appropriate.
• Teaching & Mentorship: You will serve as a mentor and guide to engineers across the organization, teaching and mentoring them to grow their skills.
• Code Review: You will do code review and mentor others within the organization to perform good code reviews.
• Operational Excellence: Guarantee the delivery of superior software that not only meets but exceeds customer expectations, while aligning with the strategic business timelines.
• Collaborative Strategy: Forge strong partnerships with product managers, designers, and company leadership to promote a culture of open communication, good collaboration, and high standards.

Qualifications

• 10+ years of professional software development experience in a fast-paced, product-driven environment.
• Marketplace product experience is highly desirable, with an understanding of scaling multi-sided platforms.
• Strong technical expertise in full-stack development, including:
• Backend development with Python (services, APIs, data-driven systems).
• Backend microservices and REST API design using Node.js.
• Frontend development with React and TypeScript, with a focus on scalable UI design and usability.
• Experience with AWS is required, including deploying, monitoring, and scaling production workloads.
• Proven leadership skills, with the ability to set technical direction, mentor engineers across levels, and influence product and business decisions.
• Excellent communication and collaboration abilities, comfortable engaging with both technical and non-technical stakeholders, from junior ICs to executives.

LI-Hybrid

Xometry is an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran, or disability status.

For US based roles: Xometry participates in E-Verify and after a job offer is accepted, will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S.

Voluntary Self-Identification

As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Completion of the form is voluntary, and any information you provide will be kept confidential. The information below is used for government reporting purposes only and does not affect your employment eligibility.

Form CC-305 — Voluntary Self-Identification of Disability

OMB Control Number 1250-0005 • Expires 04/30/2026

DISABILITY STATUS: If you have a disability, you may indicate it here. This information is voluntary and confidential.

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number.