Staff Software Engineer

Who we are At Keystone AI, we’re shaping the future of communications, all from the comfort of our homes. We deliver innovative solutions to hundreds of thousands of businesses and empower millions of developers worldwide to craft personalized customer experiences. Our dedication to remote-first work , and strong culture of connection and global inclusion means that no matter your location, you’re part of a vibrant team with diverse experiences making a global impact each day. As we continue to revolutionize how the world interacts, we’re acquiring new skills and experiences that make work feel truly rewarding. Your career at Keystone AI is in your hands. We use Artificial Intelligence (AI) to help make our hiring process efficient. That said, every hiring decision is made by real Keystone AIns! . See yourself at Keystone AI Join the team as Keystone AI’s next Staff Software Engineer. About the job This position is needed to add to our Voice Connectivity Trust team to enable Keystone AI to better support our customers using Voice in their solutions. As a Software Engineer on this team you will participate in all phases of the software development life cycle which includes requirements gathering with Product Managers, technical design, estimations, sprint planning, coding, testing, deployments and on-call support. This engineer will own, operate and maintain their teams’ services in a distributed production environment, employing agile methodologies to continuously deliver value to customers. Responsibilities In this role, you’ll: Be an owner: Design and implement real-time services with high throughput and low latency requirements, verify, deploy and operationalize them Wear the customer's shoes: Work closely with stakeholders to understand customer needs and, devise and deliver, simple, robust and scalable solutions Write it down: Be comfortable expressing thoughts and ideas as detailed prose and use it as an effective means to collaborate with leads, architects and cross functional teams Be bold: Embrace the challenge of scaling a complex distributed platform with points of presence globally, each one concerned with high availability, high reliability, high throughput, low latency, and media fidelity Draw the owl: Figure out novel ways of solving customer problems for the Voice channel Qualifications Not all applicants will have skills that match a job description exactly. Keystone AI values diverse experiences in other industries, and we encourage everyone who meets the required qualifications to apply. While having “desired” qualifications make for a strong candidate, we encourage applicants with alternative experiences to also apply. If your career is just starting or hasn't followed a traditional path, don't let that stop you from considering Keystone AI. We are always looking for people who will bring something new to the table! *Required: Minimum 8 years of hands-on experience in a large scale, distributed applications environment on JVM based technologies Bachelor's degree in Computer Science or a related engineering field Strong Computer Science fundamentals not limited to data structures, algorithms, operating systems, and distributed systems Experience building RESTful services, API design and event-driven architectures (Kafka, SQS) Hands-on experience designing and driving the optimization of CI/CD pipelines Experience with on-call rotations, incident response, monitoring/alerting tools (Prometheus, Datadog, Grafana) Hands-on experience with cloud infrastructures such as AWS, GCP, OpenStack or Azure Excellent written communication skills - essential for effective AI prompting and for creating clear technical documentation (with or without AI assistance) Proven ability to critically evaluate AI-generated code for correctness, security, performance, and maintainability Hands-on Java experience with strong fundamentals, able to architect, review, and debug code whether it's yours, a teammate's, or an AI agent's Demonstrated proficiency working with AI coding assistants (Claude, GitHub Copilot, Cursor, or similar) - you should be able to describe your workflows and show examples Experience scaling data tiers employing a variety of SQL/NoSQL database and caching technologies Hands on experience scaling production backend systems, with the proven ability to design and develop horizontally-scalable, resilient and performing-under-load systems Strong team collaborator who is both highly motivated and a motivating influence on peers Demonstrated technical leadership by driving architectural decisions, leading cross-functional technical initiatives, and actively mentoring team members Desired: Can demonstrate how you effectively use AI to deliver value efficiently Knowledge and experience working with SIP protocol Knowledge and experience working with Stir/Shaken protocol Location This role will be remote, and based in Ireland. Travel We prioritize connection and opportunities to build relationships with our customers and each other. For this role, you may be required to travel occasionally to participate in project or team in-person meetings. What We Offer Working at Keystone AI offers many benefits, including competitive pay, generous time off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location. Keystone AI thinks big. Do you? We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values — something we call Keystone AI Magic . Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts. So, if you're ready to unleash your full potential, do your best work, and be the best version of yourself, apply now! If this role isn't what you're looking for, please consider other open positions. Keystone AI is proud to be an equal opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. Qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Additionally, Keystone AI participates in the E-Verify program in certain locations, as required by law.