Role Description OpenPhone’s AI capabilities power everything from intelligent call assistants to automated workflows that help thousands of businesses communicate better. As a Staff Backend Engineer, you will own the technical strategy for how we design, build, and operate AI features across the product. You’ll partner closely with leaders across engineering, product, and security to translate ambitious product ideas into scalable, dependable systems. Your architectural choices will shape how every customer experiences AI inside OpenPhone—from the very first trial call to fully deployed agents—and you’ll be trusted to balance cutting-edge innovation with rock-solid reliability. - Own the long-term architecture for AI orchestration frameworks, agent-based workflows, and model lifecycle management. - Lead cross-functional delivery of AI features from proof of concept to production rollout, coordinating engineering, product, design, and CX. - Establish best practices for prompt engineering, evaluation, versioning, observability, and incident response for AI services. - Design and optimize low-latency streaming pipelines for speech and other real-time data when the customer experience demands it. - Drive continuous cost, performance, reliability, and security improvements for models and infrastructure. - Mentor engineers through design reviews, code reviews, and technical coaching, raising the bar for excellence across teams. - Partner with security and platform leaders to ensure data privacy, compliance, and operational excellence. - Stay current on advances in LLMs, agent architectures, and emerging tooling, translating insights into actionable roadmap proposals. Qualifications - 10+ years of backend or platform engineering experience, including LLM-driven systems in production. - Proven success leading architecture for business-critical services, balancing innovation with operational pragmatism. - Deep knowledge of LLM integration patterns, prompt design, vector search, and agent frameworks. - Expertise in event-driven and streaming architectures; you can reason about concurrency, ordering, and back-pressure under load. - Track record of driving cost optimization, observability, and incident response for AI workloads. - Excellent written and verbal communicator who aligns diverse stakeholders and produces clear, thorough design docs. - Collaborative leader who mentors others, fosters psychological safety, and elevates the entire engineering organization. - Comfortable with ambiguity, you break down complex problems, make informed trade-offs, and deliver iterative value quickly. - Empathetic and customer-focused, you balance technical decisions with user experience and business impact. Requirements - Our backend is built on Node using Typescript. - Our AI Infrastructure uses temporal.io, vector DBs, libraries like Langchain and top-tier LLM models. - We use Kubernetes on AWS to orchestrate our infrastructure setup and deployment. - The overall architecture is event-driven microservices with RabbitMQ at the center of it. - We use a variety of databases for different purposes: Postgres, Mongo, Elastic, and Redis. - We have the following clients - Web (React), Android, and iOS. - We use Kong as our public API Gateway. - Observability Tools: Datadog. - Other Tools: Figma, Linear, Notion, and Slack. Compensation The annual base salary range for this position is as follows, plus equity and benefits: - SF Bay Area, Los Angeles, Seattle, Portland, Boston, New York, and Washington, DC Metro: $205,000-$242,000 USD. - All other US Locations: $185,000-$217,800 USD. - Canada: $189,000- $222,000 CAD. The ranges displayed reflect the target for new hire salaries, and within each range, individual pay is determined by your skills and experience, as well as relevant education. Your recruiter can share more and answer questions about the specific salary range during the hiring process. Salary is just one component of Quo’s total compensation package. Your total rewards package will include equity, extensive medical coverage, a monthly lifestyle stipend, and a flexible PTO policy.

Role Description A Java Back-end Developer focuses on building robust, secure, and highly-available server-side systems and APIs that power products, working closely with front-end engineers and architects to ensure performance benchmarks are consistently met. - Design and implement microservices and distributed systems using Java and the Spring ecosystem, following established architectural patterns. - Develop secure, high-performance RESTful APIs that are consumed reliably by both web and mobile client applications. - Model, optimise, and manage relational and NoSQL databases to support scalable, data-intensive workloads. - Implement authentication and authorisation mechanisms using OAuth2, JWT, and Spring Security best practices. - Identify and resolve performance bottlenecks through profiling, load testing, and targeted refactoring of critical code paths. - Integrate third-party services, payment gateways, and external APIs in a maintainable and testable way. - Write comprehensive unit and integration tests to maintain high coverage and prevent regressions across services. Qualifications - 3+ years of professional Java back-end development with deep knowledge of the JVM and core Java libraries. - Strong hands-on experience with Spring Boot, Spring Cloud, and ORM frameworks such as Hibernate or JPA. - Solid understanding of microservices architecture, including service discovery, load balancing, and inter-service communication. - Experience with relational databases (PostgreSQL, MySQL) and caching solutions like Redis. - Practical knowledge of message brokers such as Kafka or RabbitMQ for building event-driven services. - Comfortable with Docker, Kubernetes, and setting up or maintaining CI/CD pipelines in cloud environments. - Proficiency in English.

Role Description A Java Web Developer builds and maintains dynamic web applications using Java-based server-side technologies, developing features across the presentation and application layers in collaboration with designers, back-end engineers, and stakeholders. What We Expect From You: - Develop server-side web logic using Java EE, Jakarta EE, or Spring MVC, building maintainable and well-tested application components. - Build and maintain web UIs using templating engines like JSP or Thymeleaf, or integrate with modern JavaScript front-end frameworks. - Design and query relational databases using MySQL, PostgreSQL, or Oracle, ensuring efficient schema design and query performance. - Implement and consume RESTful web services, documenting endpoints clearly for front-end teams and third-party consumers. - Ensure cross-browser compatibility and responsive layouts across a range of devices and screen sizes. - Apply web security best practices including OWASP guidelines, CSRF protection, and XSS prevention throughout the application layer. - Maintain and deploy applications on servlet containers such as Tomcat or JBoss, supporting both on-premise and cloud environments. Qualifications - 2+ years of Java web development experience with a solid understanding of the request-response lifecycle and HTTP fundamentals. - Practical experience with Spring MVC or Java EE / Jakarta EE for building enterprise-grade web application components. - Proficiency in HTML5, CSS3, and JavaScript (ES6+) for building and styling interactive front-end pages. - Experience with server-side templating using Thymeleaf, JSP, or a comparable view technology. - Solid SQL skills and experience using JDBC, JPA, or Hibernate to interact with relational databases. - Familiarity with deploying applications to Tomcat, JBoss, or WildFly in development and production environments. - Proficiency in English.

Role Description A Java Full Stack Developer designs, develops, and maintains both the client-side and server-side of web applications. You own features end-to-end, from database schema and REST API design through to responsive UI components, collaborating closely with product, design, and DevOps teams to ship high-quality software at pace. - Build and maintain scalable back-end services using Java and Spring Boot, ensuring high availability and clean service boundaries. - Develop responsive, accessible front-end interfaces using React, Angular, or Vue.js in close collaboration with UI/UX designers. - Design, query, and optimise relational databases such as PostgreSQL or MySQL, as well as NoSQL stores like MongoDB where appropriate. - Create and consume RESTful and GraphQL APIs that are secure, well-documented, and easy for other teams to integrate. - Write unit, integration, and end-to-end tests using tools like JUnit, Mockito, and Selenium to maintain high code quality. - Participate actively in code reviews, architectural discussions, and help uphold engineering standards across the team. - Deploy and monitor applications on cloud platforms (AWS, GCP, or Azure) using CI/CD pipelines and containerisation tools. Qualifications - 3+ years of Java development experience, with a strong understanding of OOP and design patterns. - Hands-on experience with Spring Boot, Spring MVC, and Spring Security for building production-grade applications. - Proficiency in at least one front-end framework — React, Angular, or Vue.js — alongside HTML5 and CSS3. - Solid experience working with both relational (SQL) and NoSQL databases in a professional setting. - Familiarity with Git version control, Docker for containerisation, and basic Kubernetes concepts. - Proven ability to design and implement RESTful or GraphQL APIs with attention to security and performance. - Proficiency in English.