Sr. Software Engineer, C++

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

Department: Research & Development

Employment Type: Full Time

Location: EMEA-Spain

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

• 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++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/Web Socket 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 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