About OnSiteOnSite is the messaging platform replacing WhatsApp for construction teams. We're building tools that turn construction site chaos into easy communication and structured the RoleWe are seeking an experienced Back End Engineer to join our team. You’ll work on a modern serverless architecture, integrating with various SaaS platforms to deliver real-time collaboration tools for construction teams.What we're looking forYou're experienced in building backend systems and can work across our stack:Proficient in TypeScript and PythonDeep expertise in AWS serverless development (Lambda, API Gateway, RDS, Step Functions, etc.)Strong experience building and optimizing RESTful APIs and event-driven architecturesSolid understanding of MySQL and ElasticsearchComfortable integrating third-party APIs (Auth0, Jira, Sendbird, etc.)Nice to havesExperience building platforms for construction, project management, or collaboration toolsUnderstanding of real-time messaging and notification syste...