Synaps is building a new standard for architectural design with AI. Real-time collaboration is a core part of the product, and we’re looking for an engineer who understands how shared systems actually work: room-based state, synchronization, failure recovery, and correctness under churn. If you’ve built multiplayer or shared-state systems before, or always wanted to, this is the right place.
What you’ll work on
You’ll own the real-time infrastructure that powers collaborative editing, the part of the product that makes presence feel instant, keeps edits in sync, and recovers sessions cleanly when networks or clients fail.
- Real-time WebSocket servers built with PartyKit on Cloudflare
- Room lifecycle design, and ephemeral vs persistent state
- Presence systems: cursors, selections, and live updates
- Reconnect, resync, and conflict recovery flows
- CRDT-based synchronization (Loro, Yjs familiarity welcome)
- Fan-out, batching, throttling, and backpressure handling
- Durable Object based room architecture
You won’t work on UI, editor tools, or geometry. This role is about the invisible infrastructure that makes collaboration feel effortless and reliable.
Our stack
- TypeScript
- PartyKit
- Cloudflare Workers and Durable Objects
- WebSockets
- CRDTs (Loro, Yjs concepts)
- Frontend in React and XState (you integrate with them, you don’t build them)
What you bring
- Strong experience building real-time or shared-state systems
- Comfort designing and operating stateful WebSocket services
- Clear intuition for event ordering, consistency, and failure modes
- Practical experience with CRDTs, or a strong understanding of how they work
- Experience running backend systems in production and debugging edge cases
- Ability to reason about tradeoffs and design for correctness, not just latency
Nice to have
- Experience with collaborative editors, multiplayer products, or document systems
- Familiarity with Cloudflare Workers or Durable Objects
- Interest in distributed systems where UX correctness matters
How we work
We’re a startup. You get real ownership, move fast, and build core product. Collaboration is a core part of Synaps, and your work directly shapes how teams design together.
We’re building a small team of sharp, creative builders who want to be early at a generational company. We care deeply about craft, ship world-class products, and expect a high bar. If that resonates with you, this is the place.
Perks and benefits
- Competitive compensation
- Flexible, trust-based work setup
- Relocation and visa support
- Offsites that aren’t cringe
- Device of choice
- Five weeks of paid vacation
Hiring process
- Screening call, 30 min, remote
- Technical assignment, 3 to 4 hours, remote or in-person
- Founders interview, 1 hour, remote or in-person
- Meet the team, 2 hours, remote or in-person