Staff Software Engineer, Backend

Keystone AI unlocks the true potential of the customer experience, turning every conversation into a competitive advantage. Keystone AI’s unified AI platform combines conversational AI agents, real-time human agent augmentation, and comprehensive conversation intelligence to drive revenue and efficiency gains across every channel. The world’s leading companies, including United Airlines, Cox Communications, and Marriott, use Keystone AI to power world-class customer experiences every day. Born from the Stanford AI Lab, Keystone AI has raised more than $270 million from the world’s leading investors, including a16z, Greylock, and Sequoia. Keystone AI’s leadership includes some of the leading minds in AI today. Our CEO, Ping Wu , founded and led Google's Contact Center AI and Vertex AI platforms before joining Keystone AI to build the future of AI-driven customer experiences. Over the next few years, AI is going to redefine how people all over the world interact with businesses every day. Come build that future at Keystone AI. Keystone AI is excited to expand our operations to Romania and build a tech hub in the region. These early joiners will play a key role in establishing our engineering team in Romania, helping to shape the future of the site. We are a remote-first environment, offering opportunities to work with a global team across Europe, the US, and Canada. Over time, we aim to create a co-working space in Romania, moving towards a hybrid environment. About the role: Keystone AI Insights: As a Staff full-stack engineer, with a backend focus, you will be at the forefront of shaping the future of customer engagement! As we work towards our vision, you'll be instrumental in delivering timely, actionable insights that drive business growth from day one. We're building a state-of-the-art Customer Data Platform, visualizing relevant insights for businesses post-onboarding and guiding customer engagement across all touch-points. Be part of the team that's redefining the way businesses connect with their customers! Responsibilities: Design, implement, and maintain backend services and APIs to support applications. Build and optimize data storage solutions using Postgres , ClickHouse and Elasticsearch to ensure high performance and scalability. Collaborate with cross-functional teams, including frontend engineers, data scientists, and machine learning engineers, to deliver end-to-end solutions. Monitor and troubleshoot performance issues in distributed systems and databases. Write clean, maintainable, and efficient code following best practices for backend development. Participate in code reviews, testing, and continuous integration efforts. Ensure security, scalability, and reliability of backend services. Analyze and improve system architecture, focusing on performance bottlenecks, scaling, and security. Qualifications We Value: Proven experience as a Backend Engineer with a focus on database design and system architecture. Strong expertise in ClickHouse or similar columnar databases for managing large-scale, real-time analytical queries. Hands-on experience with Elasticsearch for indexing and searching large datasets. Proficient in backend programming languages such as Python , Go . Experience with RESTful API design and development. Solid understanding of distributed systems, microservices architecture, and cloud infrastructure. Experience with performance tuning, data modeling, and query optimization. Strong problem-solving skills and attention to detail. Excellent communication and teamwork abilities. Conclusion: Compensation for this position includes a base salary, equity, and a variety of benefits. Actual base salaries will be based on candidate-specific factors, including experience, skillset, and location, as well as applicable local pay requirements. We are actively hiring for this role in Romania, the US, and Canada. We have noticed a rise in recruiting impersonations across the industry, where scammers attempt to access candidates' personal and financial information through fake interviews and offers. All Keystone AI recruiting email communications will always come from the @cresta.ai domain. Any outreach claiming to be from Keystone AI via other sources should be ignored. If you are uncertain whether you have been contacted by an official Keystone AI employee, reach out to [email protected]