Senior API & Interoperability Engineer - Web3 Bridges

Launch Legends Inc.; United States; Remote; USD 180,000 - 260,000; Full time

Job summary

Launch Legends is seeking an experienced API/Protocol Engineer to own versioned contracts for DevHub and partners, while managing bridges and related surfaces. You will implement durable Saga workflows for multi-step processes and ensure reliable event delivery with idempotency.

The role requires strong Kubernetes operation experience and OpenTelemetry tracing to maintain robust, observable systems. You will also contribute to developer surfaces, documentation, and sandboxes, collaborating

Qualifications

• 5+ years in protocol or API engineering.
• Proficiency in Go or Rust, and gRPC or GraphQL.
• Experience operating a bridge, IBC path, XCM, or CCIP.
• Strong understanding of distributed systems (retries, idempotency, timeouts).
• Experience with Kubernetes and tracing (OpenTelemetry).
• Bachelor's or Master's in Computer Science or equivalent.

Responsibilities

• Own versioned API contracts for DevHub and partners.
• Manage IBC channels, relaying, and bridge surfaces (Base to Autheo).
• Implement durable workflows (Saga) for multi-step flows.
• Deliver reliable event delivery (webhooks/streams) with idempotency.
• Ensure reliability via Kubernetes, circuit breakers, and tracing.
• Maintain developer surfaces including documentation and sandboxes.

Skills

Go or Rust

gRPC / GraphQL

Distributed systems

Kubernetes

OpenTelemetry tracing

IBC / bridge exposure

Education

Bachelor's or Master's in Computer Science or equivalent

Tools

Cosmos SDK

Kafka

EVM clients

Job description

Launch Legends is seeking an experienced API/Protocol Engineer to own versioned contracts for DevHub and partners, while managing bridges and related surfaces. You will implement durable Saga workflows for multi-step processes and ensure reliable event delivery with idempotency.

The role requires strong Kubernetes operation experience and OpenTelemetry tracing to maintain robust, observable systems. You will also contribute to developer surfaces, documentation, and sandboxes, collaborating