This position is for a Senior Software Engineer to join the Product CX CI Team — a vertical team delivering customer-facing features (doctor-facing and CAD) at Align Technology.

As a Senior C++ Software Engineer, you will lead feature delivery end-to-end across computational geometry, treatment planning logic, and backend services — owning technical decisions from requirements through release.

This role is expected to act as a technical anchor on the team: raising the engineering bar, closing technical decisions without escalation, and coaching less experienced engineers.

Key Responsibilities

Own features end-to-end — from requirements clarification and architecture through implementation, review, release, and post-release monitoring
Design and implement 3D geometrical and numerical algorithms in C++ for customer-facing planning scenarios (doctor-facing and CAD)
Contribute to backend services in Go supporting the customer-facing applications
Lead architecture discussions; propose, defend, and close technical trade-offs with clear reasoning
Drive clarification of ambiguous or incomplete requirements together with Business Analyst, Product Manager, and QA.
Coordinate directly with adjacent teams on cross-team dependencies — own the outcome
Set the quality bar in code reviews; mentor junior and mid-level engineers through reviews, pairing, and design guidance
Work closely with the SQA team; contribute to test infrastructure and testability of the code you write
Maintain traceability and regulatory documentation for medical software, following documentation-as-code practices

Skills, Knowledge & Expertise

Education

Degree in Computer Science, Mathematics, Physics, or Engineering

Experience

8+ years of hands-on software engineering experience in a product team
Demonstrated ownership of multiple non-trivial features taken from requirements to production
Track record of technical leadership on at least one complex feature or subsystem

Technical Skills

C++ (primary):

Strong expertise in modern C++ (C++14/17 or later), deep knowledge of STL
Experience building high-performance numerical or geometry algorithms

Go (complementary):

Practical experience building backend services in Go, including HTTP/WebSocket endpoints
Familiarity with gRPC and Protocol Buffers

General:

Ability to write testable, object-oriented code; strong opinions on design and testability
Solid understanding of algorithms; experience with 3D geometry, linear algebra, or analytical geometry is a strong advantage
Experience with Git and CI systems (Bamboo or equivalent)
Working knowledge of Python for tooling and scripting

Communication

Able to explain technical trade-offs clearly — why option A was chosen over B, what was rejected and why
Comfortable leading discussions with BA, PM, QA, and peer engineers to close decisions
Writes clear design notes, commit messages, and documentation

Teamwork

Proactive: talks to adjacent teams directly for context instead of escalating
Takes initiative on process and quality
Actively mentors junior and mid-level peers
Ownership mindset

Language

Upper-intermediate English (B2 or higher) — all internal communication is in English

Professional Qualities

Comfortable working in a regulated (medical) industry with strict process and documentation requirements
Effective under tight timelines and in changing environments
Learns new technologies quickly

Complementary Skills

AWS Lambda and other serverless patterns
Hands-on experience with Jira and Confluence
Hands-on experience using AI-powered tools in day-to-day software development

Sr. Software Engineer, 3D C++

About this role

Key Responsibilities

Skills, Knowledge & Expertise

Experience

Technical Skills

Communication

Teamwork

Language

Professional Qualities

Complementary Skills

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