Lead AI Engineer
3 weeks ago
Lead Software AI EngineerAt Klaviyo, we believe the future of software lies not in productivity tools for human users but in software that can run and optimize itself based on outcome or reward metrics. We’ve built the infrastructure and application that serve as the interface between businesses and consumers. We now have over 167,000 customers, billions of consumer profiles, and hundreds of billions of customer messages and follow-on conversion data. We have a big opportunity to build state-of-the-art AI and machine learning technologies at Klaviyo to power our products and develop AI agents that can automatically create and execute marketing or customer experiences, strategies, and campaigns for any business.As a Lead Software AI Engineer at Klaviyo, you’ll set technical direction and drive the design of scalable backend systems and AI-powered user experiences that form the foundation of our AI product strategy. You’ll work closely with product managers, machine learning engineers, and data scientists while mentoring engineers and shaping architectural decisions. This is a backend-heavy leadership role with a strong focus on applied AI/ML, including large language models (LLMs) and agentic AI systems.How You Will Make a DifferenceLead the design and development of backend systems that enable scalable AI solutions for 167K+ customers.Architect robust, reliable, and scalable data pipelines that train and serve AI/ML models at scale.Drive the integration of LLMs into production systems, powering AI agents that create and execute real-time customer experiences.Establish best practices for model evaluation, monitoring, and performance across generative and agentic AI use cases.Mentor and guide engineers, fostering a culture of technical excellence, ownership, and customer-centric product thinking.Partner with cross-functional leaders to influence AI product strategy and deliver high-impact solutions.Who You Are7–10 years of professional software engineering experience, with a strong focus on backend systems and distributed architectures.Recent, hands-on experience with AI/ML and LLMs, including fine-tuning, evaluation, and production deployment.Proven ability to design and scale distributed systems that support AI-driven applications and agent capabilities.Proficient in Python and modern backend frameworks (FastAPI, Django preferred).Skilled with big data tools (Apache Spark, Hadoop) and distributed task queues (Kafka, Celery, SQS, RabbitMQ, Redis).Experienced in architecting APIs and cloud-native solutions (AWS, Kubernetes, CI/CD pipelines).Demonstrated technical leadership — mentoring engineers, shaping architecture, and raising the bar for engineering practices.Thrives in a fast-paced, startup-like environment with high autonomy and ownership.Curious, adaptable, and motivated to stay on the cutting edge of AI/ML research and apply it to real-world business challenges.Nice to HaveExperience training and deploying reinforcement learning systems.Prior experience leading cross-functional initiatives involving data science, ML engineering, and product. We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.Please see the independent bias audit report covering our use of Covey here
-
Boston, United States SES AI Full timeA leader in energy transition technologies located in Boston is seeking an experienced Engineer to lead the development of an AI-driven molecular simulation and materials informatics platform. This pivotal role involves bridging advanced AI models with computational chemistry and overseeing the design of scientific computing platforms. Candidates should have...
-
Engineer, AI Battery Simulation
2 weeks ago
Boston, United States SES AI Full time1 day ago Be among the first 25 applicants SES AI Corp. (NYSE: SES) is dedicated to accelerating the world’s energy transition through groundbreaking material discovery and advanced battery management. We are pioneering the integration of cutting‑edge machine learning into battery R&D, and our AI‑enhanced, high‑energy‑density and...
-
AI Research Engineer
3 weeks ago
Boston, United States Cimulate AI Full timeCimulate is seeking a passionate and innovative AI Research Engineer to join our team. As a pivotal member of our research and development team, you will help us explore and implement cutting-edge artificial intelligence methodologies and models. Cimulate is committed to pushing the boundaries of technology and enhancing our products with advanced AI...
-
Lead AI Engineer
6 days ago
Boston, United States CD PROJEKT Full timeJob Description CD PROJEKT RED is looking for a Lead AI Engineer to join our Boston hub and lead the development of AI for Project Sirius - A multiplayer game in the Witcher universe. In this position, together with the rest of the team, you will help push the envelope for immersive games in the Witcher universe, creating an emotional, action-packed...
-
Lead AI Engineer
2 weeks ago
Boston, United States Cd Projekt Red Full timeCompany DescriptionTo create revolutionary, story-driven RPGs which go straight to the hearts of gamers — this is our mission. Want to dive deeper into our company’s culture? Explore our social media and check out our YouTube channel where we share behind-the-scenes insights and stories direct from our team members!Job DescriptionCD PROJEKT RED is...
-
Lead AI Engineer
4 weeks ago
Boston, United States Klaviyo Full timeAt Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the...
-
Lead Software Engineer, Data Engineering
1 week ago
Boston, MA, United States Relyance AI Full timeLead Software Engineer, Data Engineering At Relyance AI, as a Lead Software Engineer, you'll take charge of enhancing our API services, constructing reliable data pipelines, and maintaining our robust microservices architecture. This role offers the exciting opportunity to mentor junior engineers and create impactful data dashboards. You'll have complete...
-
Lead Software Engineer, Data Engineering
1 week ago
Boston, MA, United States Relyance AI Full timeLead Software Engineer, Data Engineering At Relyance AI, as a Lead Software Engineer, you'll take charge of enhancing our API services, constructing reliable data pipelines, and maintaining our robust microservices architecture. This role offers the exciting opportunity to mentor junior engineers and create impactful data dashboards. You'll have complete...
-
Senior Platform Engineer
3 weeks ago
Boston, United States Seven AI Full timeA leading AI security company in Boston is looking for a Senior Platform Engineer. This role involves designing and scaling core platforms, automating processes, and ensuring performance and reliability. Candidates should have over 5 years of experience in engineering roles, a strong grasp of advanced technologies like AWS, Kubernetes, and a passion for...
-
Lead AI Engineer
4 weeks ago
Boston, United States CD Projekt RED Full timeCompany Description To create revolutionary, story-driven RPGs which go straight to the hearts of gamers - this is our mission. Want to dive deeper into our company's culture? Explore our social media and check out our YouTube channel and Beyond the Game Blog where we share behind-the-scenes insights and stories direct from our team members! Job...
