Fullstack Software Engineer I

Role Overview Whoop is looking for a Senior Fullstack Software Engineer to join the AI Platform team in Boston, MA. This team builds technology that supports athletic performance and wellness, using artificial intelligence to deliver real impact. What You Will Do Design, implement, and optimize software solutions across both frontend and backend systems Work closely with cross-functional teams to bring new features and improvements to life Focus on delivering a seamless user experience while maintaining system performance and reliability What We Look For Experience in fullstack development, with skills in both frontend and backend technologies Interest in artificial intelligence and its applications in health or performance domains Ability to collaborate with engineers, designers, and product managers If building innovative software for athletes and wellness interests you, Whoop encourages you to apply.

About UsAt PathAI, our mission is to revolutionize patient care through AI-enhanced pathology. Our innovative platform significantly enhances diagnostic accuracy and treatment effectiveness for diseases such as cancer, utilizing cutting-edge machine learning methodologies. Our diverse team is deeply committed to tackling complex challenges and making a meaningful difference in healthcare.We are seeking talented and experienced engineers to join our dynamic team and help us expand our software platform. We prioritize leveraging the most effective tools available, which currently include:PythonVue.jsDjango + DRFDockerAWS: EKS, S3, RDS/PostgreSQL, SQS, MSK/KafkaYour ResponsibilitiesCraft elegant solutions to intricate problems through coding.Develop new features for both internal and external users while enhancing existing functionalities.Engage with a variety of systems, processes, and technologies to find sustainable solutions, from low-level systems to user interface collaboration.Lead the architectural design of our application platform, aligning with team objectives and product roadmap.Collaborate effectively with product, design, machine learning, and infrastructure teams.Establish and maintain high engineering standards, ensuring consistent code quality through thorough review, testing, and integration.Mentor and share knowledge with team members, fostering a culture of learning.Take ownership of the quality of your code and that of the team.Contribute to a SaaS platform integral to clinical trial workflows, guaranteeing reliability, data integrity, and compliance.Work alongside clinical, QA, and regulatory teams to ensure software updates meet validation criteria and support inspection readiness.

At WHOOP, we are driven by a commitment to enhancing human performance and extending healthspan. Our platform empowers a wide range of members, from Olympians and professional athletes to fitness enthusiasts, enabling them to achieve their peak potential by gaining profound insights into their bodies and daily lives. We are eager to welcome highly skilled and motivated engineers to join our team, propelling our established system to unprecedented heights. Join the AI Platform team at WHOOP where we are tasked with building a robust foundation that facilitates the scalable, responsible, and accessible implementation of Generative AI across our diverse array of products. Our primary focus is on creating reusable infrastructure, services, and tools that empower both product and software teams to explore, integrate, and deploy GenAI-powered features both efficiently and securely. By simplifying the complexities associated with large language models (LLMs) and ensuring the delivery of personalized insights to our members, our platform accelerates innovation while maintaining a consistent, high-quality user experience. As a Senior Software Engineer on the AI Platform team, you will play a pivotal role in designing and scaling the systems that underpin WHOOP’s Generative AI capabilities. You will develop robust, modular services and user-friendly tools that streamline the interaction with GenAI models across the organization. This position merges a platform-oriented mindset with engineering excellence, helping WHOOP unlock the full potential of Generative AI across our core products, coaching services, insights, and beyond.

Location: Boston, MA; Costa Mesa, CA; Seattle, WA About Anduril Industries Anduril Industries builds advanced defense technology for the U.S. and allied nations. The company’s systems run on Lattice OS, a platform that fuses thousands of data streams into a real-time, 3D command and control environment. Anduril focuses on delivering autonomy, AI, computer vision, sensor fusion, and networking solutions to military operations quickly, often in months rather than years. Team Overview: Developer Platform The Developer Platform team provides the backbone for software development at Anduril. This group manages the main developer CLI, which sees over 93,000 uses by more than 2,300 engineers. CI/CD pipelines support 3,500+ engineers across 23 product lines in the U.S., Australia, and the U.K. The team also handles deployment and release management systems, as well as the company’s LLM adoption platform. Now, the team is launching a new agentic development initiative to build next-generation AI-centric developer infrastructure. What You Will Do Build infrastructure for multi-agent orchestration, enabling AI coding agents to operate autonomously on servers and manage tasks across repositories at scale. Develop a real-time, agent-optimized knowledge base that gives AI agents detailed context about codebases, architecture, and operational patterns. Create a skills and plugin platform so teams can encode domain expertise into reusable AI features. Improve CI/CD reliability and the developer experience across 23 product lines. Design and refine release tools to simplify software deployment to production and robotic platforms. Oversee and enhance Anduril’s LLM adoption platform, including model rollouts, capacity planning, cost tracking, and developer onboarding.

Join our team at Klaviyo as a Senior AI Platform Engineer and be part of a transformative journey in the AI and machine learning landscape. We are looking for an innovative engineer who is passionate about designing and scaling backend systems that power cutting-edge AI products and solutions. In this role, you will have the opportunity to influence architecture decisions, enhance asynchronous processing, and work with distributed systems. Collaborate with product managers, machine learning engineers, and data scientists to create impactful solutions for over 167,000 customers globally. This hybrid role is based in the vibrant city of Boston, where creativity and technology converge.

Role Overview Whoop, Inc. is hiring a Software Engineer II focused on frontend development for its AI Platform in Boston, MA. This position centers on building and improving user interfaces that support the company’s fitness technology products. What You Will Do Work with teams across engineering, design, and product to deliver polished, intuitive user interfaces Contribute to the design and implementation of features that expand the platform’s capabilities Help shape the user experience for tools that support Whoop’s mission to unlock human performance What We’re Looking For Experience with modern frontend technologies Interest in building high-quality, engaging user experiences Strong collaboration skills and the ability to work with cross-functional teams This role is based in Boston, MA.

At WHOOP, we are dedicated to enhancing human performance and extending healthspan through innovative solutions. Our mission is to empower individuals to reach their peak performance and enjoy longer, healthier lives. Utilizing advanced AI technologies, we transform continuous physiological data into meaningful insights and actionable recommendations. The AI platform is vital to our vision, converting raw physiological signals into personalized guidance that our members can implement daily.We are seeking a Senior AI/ML Engineer to play a crucial role in scaling our AI-driven experiences, which include WHOOP Coach, AI-powered Support, and various intelligent features across our product suite. In this pivotal position, you will be responsible for overseeing essential components of the AI Platform that power our internal AI Studio, such as evaluation pipelines, fine-tuning workflows, LLM observability, and experimentation tools. You will collaborate closely with product teams and data scientists to translate real user needs into robust, impactful AI systems that evolve based on actual usage.

Join our innovative team at Anduril Industries as a Senior Software Engineer specializing in Platform Security. In this pivotal role, you will be responsible for designing and implementing robust security frameworks that protect our cutting-edge technology solutions. Your expertise will help us safeguard our systems against the ever-evolving landscape of cyber threats.As a key member of our engineering team, you will collaborate with cross-functional teams to identify security vulnerabilities and develop effective mitigation strategies. You will leverage your deep knowledge of software engineering principles and security best practices to enhance the security posture of our platforms.

Role overview Speechify seeks a Software Engineer to join the Platform team based in Boston, MA. The team’s work underpins the company’s goal of making reading accessible, focusing on software that can handle growth and evolving user needs. What you will do Collaborate with engineering, product, and design colleagues to deliver dependable platform features Design, build, and maintain software solutions that support a growing user base Participate in projects that improve the overall user experience

ezCater is the premier technology company in the food-for-work sector in the U.S., connecting those in need of workplace meals with over 100,000 restaurants across the country. We offer flexible and scalable solutions for everything from regular employee meals to one-time events, all supported by 24/7 customer service with real human assistance. Our platform allows companies to manage their food expenditures with customizable options, while we empower restaurant partners by increasing their order volume and attracting high-value customers.As a Senior Software Engineer on the Supplier Platform team, you will develop capabilities that enable our restaurant partners to grow their businesses effectively within the ezCater ecosystem. Your responsibilities will include designing and constructing data structures and services that ensure our partners receive a top-tier reporting experience and personalized interactions within the product.You will work collaboratively with teams across Data Engineering, Security, Product, Operations, and other engineering groups within the company. This position reports to the Engineering Manager of the Supplier Platform team within the ezCater Product Engineering organization.

Axiomatic AI offers a Software Engineering Internship focused on Platform and DevOps. This position is available in Boston, US or Castelldefels (Barcelona), Spain. Role overview Interns will join experienced engineers to support platform reliability and efficiency. The work centers on refining development workflows and deployment processes. Projects often involve applying artificial intelligence to practical challenges. What you will do Collaborate with engineers to enhance platform performance Assist in improving development and deployment pipelines Contribute to initiatives that use AI in real-world applications Internship experience Direct involvement with current platform and DevOps methods Insight into active AI projects Work closely with a knowledgeable engineering team

Join Code Metal, where we are at the forefront of developing innovative AI-powered transpilation tools that seamlessly connect algorithm development with deployment for embedded systems. As a Senior Software Engineer specializing in Agentic AI, you will be instrumental in designing and executing sophisticated code generation pipelines that incorporate Generative AI, Static Analysis, and Formal Verification methodologies. This role provides a unique opportunity to influence the evolution of automated, AI-driven software translation for critical applications.Architect and implement intricate workflows utilizing state machines, message queues, and distributed processing.Leverage Docker and related technologies to maintain dependable and reproducible environments.Develop robust, modular codebases for code translation products that are thoroughly tested.Collaborate with domain experts to integrate verification techniques into AI-enabled code generation processes.Guarantee high availability and scalability of AI services through cloud platforms and distributed system architectures.

Role Overview Whoop is hiring a Software Engineering Manager to lead the Translations Platform team in Boston, MA. This manager will guide a group of engineers focused on improving and expanding the company’s translation technology. The team’s work supports products used by millions around the world. What You Will Do Oversee engineering projects that enhance Whoop’s translation capabilities Mentor and support a team of engineers, helping them grow and deliver strong results Promote a culture of collaboration and continuous improvement within the team Shape the direction of translation technology across Whoop’s products Impact Your leadership will help drive innovation in Whoop’s translation platform, making a direct impact on the experience of users worldwide.

At Klaviyo, we celebrate the diverse backgrounds, experiences, and perspectives that each team member—the Klaviyos—brings to our dynamic workplace. We believe that everyone deserves an equitable opportunity to succeed, and we value the unique experiences that go beyond conventional job requirements. If you find that you closely align with our expectations, we encourage you to apply! Curious about life at Klaviyo? Discover how we empower creators to shape their own futures at klaviyo.com/careers.Why Join Our Email Platforms Team?The Email Platforms team at Klaviyo is at the forefront of developing cutting-edge infrastructure to ensure reliable, scalable, and high-performance email delivery. Our mission is to propel Klaviyo to enterprise-scale by evolving and owning our email sending pipeline comprehensively. We are heavily investing in our proprietary email delivery infrastructure, granting us enhanced control, performance, and reliability in serving some of the world's largest brands.As a member of this high-impact team, you will tackle significant technical challenges related to high-throughput systems, distributed messaging, and service performance at scale. Your work will play a crucial role in enhancing customer satisfaction and driving business success. If you are passionate about email infrastructure, systems design, and high-scale backend development using Go, this opportunity is perfect for you.Your Impact:Lead and own key components of the email pipeline architecture.Design and implement scalable, high-throughput services using Go.Create systems to manage message queues and oversee email delivery.Ensure our systems scale seamlessly with customer growth, particularly as we onboard larger enterprise accounts.Collaborate across departments to uphold the highest standards of performance, reliability, and deliverability.Revolutionize workflows by integrating AI, building smarter systems and processes from the ground up.Your Profile:Senior-level backend engineer with a strong foundation in systems design.Expertise in Go (mandatory); experience with Python is a plus.

At WHOOP, our mission is to enhance human performance and healthspan. We empower our members to reach new heights by providing them with valuable insights into their bodies and daily lives.We are seeking a talented Software Engineer II to bolster our Business Systems team. In this pivotal role, you will be responsible for designing, developing, and maintaining internal tools and integrations that are crucial for our business operations. You will collaborate cross-functionally with various teams at WHOOP to ensure our systems are scalable, reliable, and efficient, thus significantly impacting our ability to serve our members and scale our business.

At Hi Marley, we understand that insurance plays a crucial role in people's lives during their most challenging times. Our mission is to revolutionize communication within the Property and Casualty (P&C) industry, making those pivotal moments quicker, simpler, and more empathetic for both carriers and their customers. We harness the power of AI-driven software to keep the claims conversation both informed and connected. If you share our vision of merging operational excellence and automation with a human touch, we’d be thrilled to connect with you.As we expand our team, we are seeking a Senior Software Engineer who is enthusiastic about crafting high-quality software that creates a tangible impact. You will be instrumental in delivering distributed and scalable systems that facilitate meaningful interactions between carriers and their clients. The ideal candidate should have a proven track record of developing within cloud environments and a pragmatic, hands-on approach to innovation—leveraging cutting-edge technologies, including AI-assisted development tools, to tackle complex challenges and yield significant results.Collaboration and shared enthusiasm are foundational to our culture, which is why this position entails being present in our Boston office two days a week.

Anduril Industries stands at the forefront of defense technology, dedicated to revolutionizing military capabilities for the United States and its allies through cutting-edge innovation. Our mission is to integrate the expertise, technology, and business models of the most pioneering enterprises into the defense sector, fundamentally transforming the design, construction, and commercialization of military systems. Our suite of solutions is driven by Lattice OS, an AI-enhanced operating system that consolidates thousands of data streams into a dynamic, 3D command and control environment. As we navigate the complexities of global strategic competition, Anduril is devoted to delivering state-of-the-art autonomy, artificial intelligence, computer vision, sensor fusion, and networking technologies to military operations in a matter of months, not years.ABOUT THE TEAMThe Developer Platform team is the foundation of Anduril’s engineering ecosystem, creating essential infrastructure that empowers teams to deploy mission-critical defense systems effectively. In this role, you will refine release pipelines and CI/CD workflows that power Anduril's Software Factories across the U.S., Australia, and the UK. You will also develop productivity-enhancing tools, including our Golang-based dx CLI, while architecting data infrastructure to derive actionable engineering metrics and KPIs. Your contributions will significantly enhance productivity throughout our software engineering landscape, establishing a scalable foundation that aligns with Anduril’s growth and its mission to tackle pivotal defense challenges through advanced technology.

Join Our Innovative TeamBe part of the Customer Experience (CX) Product team that oversees the complete post-booking journey. From the moment a trip is booked to handling changes, disruptions, refunds, and customer support interactions, we are dedicated to enhancing the travel experience.We develop and maintain systems that provide rapid, high-quality support at scale, including:User-friendly self-service experiences within the Hopper app and partner-integrated systems.Robust internal agent platforms that facilitate efficient, high-quality human resolution.HTS Assist, our premier agentic AI platform, utilized internally and as a B2B solution for global travel partners.Our platforms serve millions of travelers across various channels—chat, voice, web, and third-party—ensuring seamless post-booking experiences worldwide.Your RoleAs a Senior Software Engineer in the CX Platform team, you will architect, build, and enhance the core systems that underpin Hopper’s post-booking experience. Your contributions will directly affect customers, internal support agents, and the growth of HTS Assist across AI-driven communication channels.You will work in close collaboration with Product, Design, AI, Data, and Operations teams to deliver intelligent, scalable customer service systems, including conversational AI workflows and self-service customer journeys.Daily ResponsibilitiesDesign, develop, and enhance backend and/or full-stack systems that support HTS Assist, internal agent tools, and customer self-service flows.Create scalable APIs, microservices, and orchestration logic for complex post-booking journeys across AI, chat, voice, and web.Collaborate with product, design, AI, and operations teams to implement features that optimize customer experiences and improve agent efficiency.Integrate with external systems such as telephony, CRM, identity, and booking platforms to support both internal and partner-specific applications.Own features from initial technical design through implementation, testing, deployment, monitoring, and iteration.

Acadian Asset Management is a pioneering global systematic investment manager, leading the charge in data-driven investing since 1986. With our headquarters in Boston and offices in Singapore, London, and Sydney, we oversee more than $170 billion for esteemed institutions worldwide, including pension funds, endowments, foundations, and sovereign wealth funds. Our approach utilizes cutting-edge technology, extensive datasets, and interdisciplinary expertise to guide clients through complex markets and reveal insights that traditional methods may overlook.What truly differentiates Acadian is our team. We cultivate a collaborative and intellectually curious workplace where ideas are challenged, diverse perspectives are valued, and innovation flourishes. United by a common goal, we are committed to delivering exceptional client outcomes while supporting each other in work that is both demanding and fulfilling. Our flexible hybrid work environment, comprehensive benefits, and a casual yet focused office culture are designed to foster the meaningful, collaborative work that defines Acadian.Position Overview:The Platform team plays a crucial role in developing and maintaining services that empower our development teams to utilize frameworks, tools, and services across in-house and vendor PaaS/IaaS platforms. This team defines the architectural roadmap, establishes best practices, and provides training on these services. In this role, you will collaborate with a cross-functional team responsible for implementing and managing our investment infrastructure, concentrating on creating reusable application templates, delivery patterns, and operational support for our systems deployed on AWS and Kubernetes.