Sr. 3D C++ Software Engineer

About the role

As a Sr. 3D C++ Software Engineer, you will lead efforts to design and develop the core algorithms and systems behind our next-generation 3D applications, directly enabling innovative orthodontic devices. In this dynamic research and development environment, you will apply advanced C++, 3D computational geometry, and mathematical methods to solve complex problems at scale, working closely with cross-functional teams including biomechanics, manufacturing, and product engineering. This role offers the opportunity to contribute from early research through production, shaping the future of 3D orthodontic technology. Depending on expertise and experience, the position level can be adjusted anywhere from junior to senior level.

Responsibilities

• Lead efforts to design and develop C++ implementations of 3D geometry algorithms, working directly with triangle meshes and derived geometric representations used in research and production software, including pipelines that translate design intent into manufacturing-ready representations.
• Apply computational geometry and mesh processing techniques to analyze real-world requirements, including constraints arising from additive manufacturing processes, evaluating accuracy, robustness, and performance trade-offs, and implement solutions that behave correctly across edge cases.
• Translate product and technical requirements into clear designs and reliable implementations, selecting appropriate methods and tools.
• Collaborate with clinical, biomechanical, manufacturing, and product partners to translate domain constraints into concrete geometric behavior, validating assumptions through implementation and iteration.
• Deliver high-quality, maintainable, and testable code, contributing to the ongoing improvement of a large and evolving codebase in a regulated environment.
• Participate in an agile R&D team, supporting feature delivery, issue resolution, and coordinated releases with globally distributed teams.

Requirements

• BS in mathematics, computer science, engineering, or equivalent degree; PhD and master’s degree are preferred, or equivalent years of experience.
• 8+ years of directly related professional experience developing software for technical or scientific applications.
• Strong proficiency in modern C++, including tools such as Git, Visual Studio, Jira, and Confluence.
• Strong foundation in linear algebra, geometry, or numerical methods as applied to 3D problems.
• Ability to clearly describe previous 3D or geometry-related work, including the problem being solved, the approach taken, and the trade-offs involved.
• Strong analytical and problem-solving skills, with the ability to understand, structure, and reason about complex technical problems.
• Experience translating requirements into robust, maintainable implementations within a collaborative development environment.

Skills

• Familiarity with software development best practices, including code reviews, testing, and documentation.
• Experience in a research, R&D, or startup-like environment.
• Experience developing or deploying software on Linux.
• Exposure to cloud services (e.g., AWS) or large-scale workflows.

Pay

If provided, base salary or wage rate ranges are the range in which Align reasonably expects to set a candidate’s pay for the posted position. Actual placement depends on the individual skills and experience level of a candidate plus the total compensation and equity across team members. For other locations outside of the primary location, the base salary range will be adjusted geographically. For Field Sales roles, the salary listed is the base pay only and does not include the applicable incentive compensation plan. A cost of living adjustment may be added to base pay for higher cost areas in the U.S.

Benefits

Align offers the following benefits to full-time employees in this position:

Family Benefits

• Medical (with a Health Savings Account option for some plan offerings), dental, and vision for employees and their eligible dependents.
• Discounts on Invisalign and Vivera to employees and their eligible dependents after 90 days of employment.
• Back-up Child/Elder Care and access to a caregiving concierge.
• Family Forming Benefits – Available to employees and their spouse or domestic partner, covered under one of Align’s health plans.
• Breast Milk Delivery and Lactation Support Services.
• Employee Assistance Program.
• Hinge Health Virtual Physical Therapy – Available to all employees and eligible dependents (age 18+) enrolled in an Align medical plan.

Employee Benefits

• Short-term and long-term disability insurance.
• Basic Life Insurance and Accidental Death and Dismemberment. Voluntary Supplemental Life Insurance for Employee, Spouse/Domestic Partner, and Child(ren).
• Flexible Spending Accounts – Employees may be eligible to participate in a health care account (including a limited health FSA if enrolled in a HDHP), dependent care account, and a pre-tax commuter benefit plan.
• 401k plan (with a discretionary Company match of 50% up to 6% of eligible earnings up to a maximum match of 3%. Employer match vests after two years – 25% year one and 100% at year two. Align offers traditional, Roth, and after-tax options).
• Employee Stock Purchase Program (Employees must work 20 hours or more and be employed on purchase date to be eligible).
• Paid vacation of up to 17 days during the first full year of employment (currently accrued at the rate of 5.24 hours each pay-period), which carries over to a maximum cap of 30 days. Annual paid vacation time accrual increases based on tenure. Both exempt and non-exempt employees who work 32 hours or more per week receive prorated vacation accrual based on their regularly scheduled work hours and tenure.
• Sick time is accrued throughout the year at the rate of one hour for every thirty worked. Employees can carry over unused sick leave each year, up to a maximum balance of 80 hours.
• 11 Company-designated paid holidays throughout the year.
• Up to 6 weeks of paid Parental Leave if employed for at least 12 consecutive months, or up to 4 weeks if employed for less than 12 consecutive months. All parental leave must be completed within one year of the birth or placement of the child. Parental leave is in addition to any state and/or local parental leave benefits.
• Three days of paid bereavement leave (extended to 5 paid days off in some cases due to travel).
• Non-exempt employees will receive full pay for up to 10 days of jury duty. Exempt employees will receive their full salary during any week they serve and perform any work.
• Other insurance such as legal, critical illness, voluntary accident, long-term care, auto, home, and pet insurance are available for purchase.