Senior Full Stack Engineer (Workflow)
LottieFiles
About the Role
We're seeking an exceptional Senior Full-stack Engineer to take part in the ground-up rebuild of our LottieFiles Platform - a digital asset management and collaboration platform serving thousands of users worldwide. This is a rare opportunity to build a greenfield application from scratch, making foundational technical decisions that will impact our platform for the next 5+ years.
As a senior full stack engineer, you'll be responsible for both hands-on development and architectural discussions with the team leadership. You'll work with modern frontend and backend technologies while leveraging your expertise in systems-level programming to optimize performance-critical operations.
This role is perfect for engineers who thrive at the intersection of elegant frontend experiences and high-performance backend systems - someone who can build beautiful UIs while also optimizing the hot paths that handle operations at scale.
What You'll Do
Technical Leadership & Architecture
- Participate in shaping the technical vision for rebuilding our asset management platform from scratch
- Design centralized data architecture with direct database integration and shared business logic reusable across SSR and future GraphQL
- Make critical architectural decisions including tech stack selection, state management patterns, data layer design, and performance optimization strategies
- Ensure future-proof architecture compatible with GraphQL migration while optimizing for immediate SSR performance
- Define coding standards and best practices for the team, ensuring maintainable, scalable code
- Collaborate with product and design teams to translate requirements into technical specifications
Full-stack Development
Frontend
- Build modern React-based apps with real-time capabilities using technologies like TanStack ecosystem, Server-Sent Events, and BroadcastChannel API
- Build performant UI components with smooth data loading patterns, virtualization, and responsive user interactions
- Optimize bundle size, lazy loading, and code splitting for <1s Time to Interactive
Backend Integration
- Build a shared business logic layer reusable across multiple service boundaries and rendering contexts
- Design database schema and ORM integration
- Develop background job processing systems for asynchronous workflows
Performance-Critical Systems (Rust/Zig)
- Design and optimize performance-critical operations using systems-level programming and worker-based architectures to keep heavy processing off the main thread
- Implement WASM modules for browser-based file processing with near-native performance
- Build batch processing systems capable of handling large-scale concurrent operations efficiently
- Profile and eliminate performance bottlenecks across critical data processing and transformation pipelines
Required Qualifications
Core Skills
- 5+ years of professional software engineering experience, with significant full-stack work
- Expert-level React and TypeScript with deep understanding of modern patterns and performance optimization
- Strong backend development experience with direct database integration, and API design
- Experience designing centralized business logic layers reusable across multiple platforms (SSR, APIs)
- Database expertise: Schema design, query optimization, PostgreSQL
- Production experience with real-time web technologies (WebSockets, SSE, WebRTC)
- Deep understanding of web performance (Core Web Vitals, bundle optimization, lazy loading, code splitting)
- Experience with state management at scale (Redux, Zustand, Jotai, Recoil, or similar)
- Strong experience in systems-level programming for performance-critical applications, with proficiency in low-level optimization techniques including parallel processing, memory management, profiling, and benchmarking.
- Experience building robust file processing systems including upload/download handling, media compression and format conversion, file validation, and quality checks.
- Familiarity with cloud infrastructure, CI/CD pipelines, containerization, and monitoring/observability practices.
LottieFiles Perks
- Fully Remote Working Environment
- Flexible Work Hours
- A welcome gift and LottieFiles swag pack
- Bonus to set up your workstation at home
- Unlimited Leave Days
- Medical Insurance
- Generous learning budget
- Gym membership
- Co-working space membership
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