Sr. Software Engineer, C++ (Madrid-based)

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., * 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, At Align, every smile matters. We're committed to helping you thrive by supporting the health, growth, and well-being of our team members through a variety of tools and programs. While specific offerings may vary by location and role, Align employees can typically expect:
• Health and well-being programs to keep you thriving in both body and mind.
• Employee-exclusive discounts on Invisalign products.
• Learning opportunities through online learning resources and support for your individual development plans.
• Inclusive, global workplace that fosters collaboration, recognition and belonging.

Do you have experience in gRPC?, * Degree in Computer Science, Mathematics, Physics, or Engineering

• 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

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

• 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

• 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

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

• 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

• 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

Helping change millions of lives, one smile at a time.

Discover your straight path to a bright future at Align. As a part of our smart, diverse and fast-moving global team, you'll make an impact for the market leader that's moving an industry forward.

Want to find out what’s next for us—and for you?

Follow us here on LinkedIn for business updates and #lifeatalign stories, and check out our current opportunities at www.aligntech.com/careers.

About Align
Twenty years ago, we pioneered the world's first clear aligners. Since then, we have continuously innovated with new products and technologies that are revolutionizing treatments for doctors and their patients. Invisalign clear aligners and the iTero Intraoral scanner help dental professionals achieve the clinical results they expect and deliver effective, advanced dental options to their patients.