Cssmerge Senior Frontend Engineer at Cssmerge responsible for building and scaling real-time logistics and operations platforms using React and React Native. Lead technical design and improve frontend reliability and scalability.
Responsibilities
We’re looking for a Senior Frontend Engineer to help build and scale Picnic’s real-time logistics and operations platforms. This role is ideal for someone who thrives in ambiguity, enjoys working on complex, high-performance systems, and wants to shape frontend architecture that directly powers real-world operations.
You’ll work across web and mobile surfaces, partner closely with backend and operations teams, and play a key role in defining how we build, ship, and scale frontend systems at Picnic.
Design and build high-performance React applications powered by WebSockets, SSE, and GraphQL subscriptions.
Contribute to and shape our courier mobile apps built in React Native.
Lead technical design for complex features and systems, from initial architecture through production rollout
Own projects end-to-end, driving execution, technical decisions, and cross-functional alignment
Improve frontend reliability, latency, and scalability in a real-time, high-throughput environment
Lead debugging, incident response, and performance investigations for frontend systems
Mentor and coach engineers, raising the bar for frontend engineering across the team
Qualification
Required
3+ years of experience in software engineering, with deep frontend expertise
Strong experience with TypeScript and modern web application development
Solid understanding of client networking, async programming, performance optimization, caching, and client-side state management
Experience integrating with GraphQL and REST APIs
Proven ability to lead technical initiatives and influence architecture and best practices
Experience mentoring junior engineers and supporting team growth
Comfort working outside your immediate comfort zone and adapting as the product and team evolve
Preferred
Experience building or operating delivery, logistics, or real-time systems at scale
Full-stack experience and an understanding of backend tradeoffs and system design
Track record of improving developer productivity through tooling, patterns, or process improvements
Familiarity with modern frontend architecture best practices, including performance, security, and usability
