Senior Cross-Platform Application Engineer Europe time zone

At Goodnotes,aar
merge human creativity with the breakthrough capabilities of AI. Our renewed vision and mission drive us to create the best medium for human and AI collaboration, empowering users to explore new dimensions of productivity, creativity, and learning.

• Dream big — Be visionary, strategic, and open to innovation
• Build great things — Work in service of our users, always improving and pushing higher
• Operate like an owner — Take responsibility with bold decision‑making and bias for action
• Win like a sports team — Be trusting and collaborative while empowering others
• Learn and grow fast — Never stop learning and iterate fast
• Share our passion — Share ideas and practice enthusiasm and joy
• Be user obsessed — Empathetic, inquisitive, practical

At Goodnotes, we are driven by a mission: to connect millions of users across devices and platforms through seamless data synchronization and collaboration. As a Senior Cross‑Platform Application Engineer, you will play a pivotal role in bringing this vision to life. You will work on cutting‑edge challenges in networked operations, including HTTP and Web Socket communications, while building our sync engine—a fully offline‑first, distributed event‑sourced system.

Beyond sync, you may develop collaboration features that enable users to work together seamlessly. Your work will enable users to access their data in near real‑time, collaborate effortlessly with others, and trust that their information is always backed up and available. Join us in creating the infrastructure that powers meaningful connections and collaboration for Goodnotes users worldwide.

You will:

• Design and build a cross‑platform application used by tens of millions of users
• Work primarily in Typescript and Swift, targeting Web Assembly and the web platform
• Architect scalable, maintainable modules and APIs that unlock new features and support rapid growth
• Implement elegant solutions with clean code
• Continuously improve development practices through automation, documentation, and testing
• Share knowledge through reviews, design docs, and mentorship

You will need:

• Strong proficiency in systems or application programming with one or more of: C, C++, or Rust
• Solid understanding of cross‑platform development practices, including portable code, build systems, and FFI
• Experience with Swift programming is advantageous
• Experience with networking and distributed systems: HTTP, Web Sockets, backoff and retry, consistency models, conflict resolution, and offline‑first architectures
• Concurrency fundamentals and performance engineering skills (profiling, memory, async primitives)
• Experience with sync engines or distributed systems
• Strong computer science fundamentals and a track record of shipping production software
• Excellent problem solving, communication, and storytelling skills
• A love of software craftsmanship
• Strong sense of the best tools for any task

Nice to have:

• Experience integrating Swift with C/C++ or Rust via FFI, C ABI bridges or code generation
• Familiarity with Swift as a cross‑platform language (e.g. Swift
  
  PM, Swift on Linux, Swift Wasm)
• Experience with data serialization and schemas such as Protobuf or Flat Buffers
• Worked on libraries consumed across multiple platforms such as iOS, macOS, Android, Windows, or Linux

Even if you don’t meet all the criteria listed above, we would still love to hear from you! Goodnotes places a lot of value on learning and development and will support your growth if needed.

Note on our stack and mindset:

endicded content

The stack:

• Programming
  
  Languages:
  
  The cross‑platform application has a large amount of shared common code written in Swift. Platform‑specific code for non‑Apple platforms is written in Type Script.
• Concurrency:
  We have a large, old, but modular codebase. We use modern Swift Concurrency as much as possible as we gradually move away from RxSwift.
• Cross‑platform:
  We re‑use our core packages on cross‑platform using Swift Wasm, UI for other platforms is written using React or their respective native APIs.
• Dependencies:
  We exclusively use Swift Package Manager and frequently make new local packages.
• Source control and builds:
  We have a mono‑repo and use…