Staff Software Engineer — DevPlatform (Java, AWS)

Duetto's core Java/Spring platform processes millions of rate decisions daily across thousands of hotels worldwide — and this role owns its architecture and evolution. As Staff Software Engineer on the Dev Platform team, you'll drive domain decomposition, define service boundaries, and lead the modernisation of a high-throughput, multi-tenant system that sits at the heart of everything Duetto ships. You'll also be at the frontier of how AI-augmented engineering works in practice — pioneering workflows using Claude Code, Claude MPM, and Duetto's in-house MCP server platform across US and European engineering teams.

Responsibilities

You'll own the architecture and technical roadmap of Duetto's Java/Spring monolith — driving domain decomposition, defining service boundaries, and leading platform modernisation initiatives that improve modularity, reliability, and developer experience at scale; You'll design and build event-driven data flows using AWS Kinesis, SQS/SNS, and the Spring Cloud Stream processing framework, and improve the GraphQL API layer and backend services powering hotel pricing, inventory, and demand management across 80+ PMS/CRS integrations; You'll operate and tune MongoDB, Redis (Redisson), and PostgreSQL for performance and reliability in a high-throughput, multi-tenant environment — and strengthen platform observability through OpenTelemetry, Datadog, Prometheus, Grafana, and Sentry instrumentation; You'll pioneer AI-augmented engineering workflows using Claude Code, Claude MPM, and Duetto's in-house MCP server platform (82+ tools) — setting the standard for how AI-assisted development works across US and European engineering teams; You'll drive architecture decisions through design docs and RFCs, establishing patterns for schema evolution, contract testing, and observability across the platform — influencing technical direction without needing formal authority to do it; You'll mentor engineers across US and EU teams, raising the bar for code quality, system design, and technical standards in a globally distributed engineering organisation

Requirements

7+ years building production backend systems at scale; Deep expertise in Java — Spring Framework, Gradle, and JVM performance tuning; Production experience with event-driven architectures — AWS Kinesis, Kafka, or equivalent; Strong system design fundamentals: domain decomposition, modularity, schema evolution; AWS production experience across EKS/ECS, S3, SQS/SNS, and IAM; A demonstrated track record of driving architecture decisions and authoring design docs without formal authority

Nice to have

Working proficiency in Python for tooling, automation, or data workflows; Experience with MongoDB at scale — indexing, aggregation pipelines, sharding; Hands-on experience with AI-assisted development: LLM coding agents, prompt engineering, or MCP tooling; Experience evolving large monoliths toward modular or service-oriented architectures; Familiarity with the hospitality domain — PMS/CRS systems, rate management, or demand forecasting