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

This is a senior backend engineering role at Align Technology, focusing on C++ and Go development for customer-facing features. The position involves leading technical decisions, designing 3D algorithms, and mentoring junior 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

• 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
• Strong expertise in modern C++ (C++14/17 or later), deep knowledge of STL
• Experience building high-performance numerical or geometry algorithms
• Practical experience building backend services in Go, including HTTP/WebSocket endpoints
• Familiarity with gRPC and Protocol Buffers
• 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
• Experience with Git and CI systems (Bamboo or equivalent)
• Working knowledge of Python for tooling and scripting
• Upper-intermediate English (B2 or higher)
• Comfortable working in a regulated (medical) industry
• Effective under tight timelines and in changing environments

• Health and well-being programs
• Employee-exclusive discounts on Invisalign products
• Learning opportunities through online learning resources
• Inclusive, global workplace