Software Engineer - Platform

At Fastly, we empower individuals to maintain meaningful connections with the things they cherish. Our cutting-edge edge cloud platform allows customers to deliver exceptional digital experiences with speed, security, and reliability by processing and securing applications as close to end-users as possible — right at the edge of the Internet. Our platform is engineered to harness the potential of the modern internet, enabling programmability and supporting agile software development. We proudly serve some of the world's most influential companies, including GitHub, Yelp, Paramount, and JetBlue.Join us in building a more trustworthy Internet.Posting Open Date: Reposted March 30, 2026Anticipated Posting Close Date*: April 20, 2026*This job posting may close earlier due to high applicant volume. Senior Principal Engineer, Platform EngineeringAs a member of Fastly’s Platform Engineering team, you will be instrumental in establishing the essential frameworks that enable engineers to deliver quickly, safely, and at scale. In the role of Senior Principal Engineer, you will guide the technical direction and spearhead cross-organizational initiatives aimed at enhancing our platform, developer experience, and operational excellence. Collaborating closely with fellow engineers, you will work to eliminate friction, standardize best practices, and create paved roads to expedite product delivery. This is a highly collaborative and hands-on position, representing the Platform Engineering organization and reporting directly to the Senior Director of Engineering.

Join Pinterest as a Principal Engineer for our Compute Platform, where you'll play a crucial role in driving the architecture and implementation of scalable systems that power our services. You will lead a team of talented engineers, guiding them in building innovative solutions that enhance our platform's performance and reliability.In this position, you will have the opportunity to collaborate with cross-functional teams, mentor junior engineers, and contribute to the development of best practices and high-quality code. If you are passionate about technology and eager to make an impact, we would love to hear from you!

Your Contribution at Lila Sciences We are on the lookout for a Principal Software Engineer with full stack proficiency to become an integral part of our software team. You will play a key role in shaping the future of our AI-powered scientific platform. This position involves designing, constructing, and fine-tuning backend systems that support intelligent, data-centric applications. Your focus will be on creating user interfaces, services, high-performance APIs, and databases while ensuring the robustness of services that merge advanced AI frameworks with intricate scientific analytics and lab workflows. Collaboration is vital as you'll work alongside ML researchers, platform engineers, and scientists to build systems capable of managing varied workloads and scaling effortlessly. This includes working with structured SQL databases, data lake houses, and vector databases. If you are enthusiastic about crafting high-performance and sophisticated systems, we would love to connect with you! Your Responsibilities UI and API Development: Create secure, high-performance, and well-documented user interfaces and APIs that integrate seamlessly with AI applications. Database Design and Management: Develop schemas and oversee diverse data systems (including SQL, NoSQL, and Vector DBs) for peak performance and scalability. Application Implementation: Spearhead the development of both front-end and backend services with an emphasis on performance, maintainability, and reliability. System Optimization: Identify and resolve system bottlenecks to ensure high availability and low-latency performance across large-scale workloads. Cloud Services and Infrastructure: Utilize AWS services, Kubernetes, and cutting-edge DevOps practices to design and deploy production-ready systems at scale. Collaborative Development: Partner with ML researchers, engineers, and scientists to weave data pipelines, APIs, and cloud infrastructure into scientific workflows.

Join Condor Software as a Full-Stack Platform EngineerAt Condor, we are revolutionizing the financial infrastructure that supports clinical development. With billions invested annually in discovering and developing new therapies, we strive to connect clinical operations and finance into a cohesive system. By integrating real-time financial intelligence, we empower R&D and finance leaders with the tools they need to make informed, high-stakes decisions.We are an AI-driven, pharma-native infrastructure provider, scaling industry standards in collaboration with top-tier partners. Our platform facilitates prediction, control, and execution in the most complex R&D environments worldwide.The Importance of Your RoleHaving established ourselves as a trusted partner for enterprise teams, we are now focused on the challenging task of scaling our platform to meet increasing demands. As a rapidly growing company, backed by prominent investors like Felicis and 645 Ventures, this is a unique opportunity to contribute to the foundational infrastructure that will redefine how therapies reach patients.Your ResponsibilitiesAs a Full-Stack Platform Engineer, you will be pivotal in building and scaling the core platform that supports the financial intelligence infrastructure relied upon by leading biopharma companies. This role encompasses critical engineering tasks at the intersection of backend systems, cloud infrastructure, and intelligent automation, with a strong emphasis on reliability and scalability.Your primary focus will be on backend architecture, where you'll design and implement services that drive complex financial and operational workflows. You'll be instrumental in shaping data flow, workflow orchestration, and enabling emerging AI-driven capabilities. This role goes beyond simple integration; you'll be crafting robust primitives that support other teams as our product and customer base expand.Working as a core member of a cross-functional product team, you will closely collaborate with product managers, designers, quality engineers, and data specialists to transition features from concept to production. While backend expertise is crucial, you will also engage across the stack to ensure the platform's capabilities are effectively leveraged.

Join Cloudflare as a Principal Software Engineer specializing in Resiliency, where you will play a pivotal role in enhancing our systems' robustness and availability. Your expertise will contribute to building and maintaining resilient infrastructure that supports our global network, ensuring our customers receive uninterrupted service.In this role, you will work alongside a talented team of engineers to identify vulnerabilities, implement solutions, and innovate new strategies that enhance system performance and reliability. If you are passionate about software engineering and system resiliency, we invite you to apply!

JOIN OUR TEAM AS A PRINCIPAL SOFTWARE ENGINEERAs a Principal Software Engineer at Saviynt, you will take the helm in designing, developing, and scaling our core Java-based backend services that drive our multi-tenant AI platform. Your expertise will be pivotal in architecting and optimizing platform components to handle high-throughput, low-latency, and mission-critical workflows.Your role will encompass integrating and managing essential data systems, including relational databases, Redis, Elasticsearch, and LDAP, ensuring they perform reliably and are always available. You will spearhead the modernization of backend services, refactoring legacy Java components while transitioning to contemporary patterns such as reactive programming and event-driven architectures.In this collaborative environment, you will work closely with cross-functional teams across DevOps, Security, SRE, and Application Engineering to enhance platform capabilities. You will evaluate and implement scalable solutions for authentication, authorization, tenant isolation, and configuration management.As a mentor, you will guide engineers in deep Java design principles, debugging complex issues, and engineering for reliability. You will also be responsible for developing and maintaining platform APIs, service orchestration logic, and critical workflows that support core business operations. Your keen eye will help identify and remediate bottlenecks in Java services, JVM performance, and memory management. Additionally, you will build automation and guardrails that enhance developer productivity and service reliability through CI/CD pipelines and code linting.Partnering with architecture and leadership, you will drive the long-term technical strategy and evolution of our platform.

Join Cloudflare as a Principal Software Engineer specializing in billing systems, where you will play a pivotal role in shaping our payment and invoicing solutions. You will collaborate with cross-functional teams to implement innovative solutions that enhance user experiences and streamline processes. If you're passionate about building scalable software and want to contribute to a fast-paced, innovative environment, we want to hear from you!

Join Discord, a platform that connects over 200 million users every month primarily through gaming. With over 90% of our users engaged in gaming activities, we facilitate over 1.5 billion hours of gaming conversations, enhancing the experience before, during, and after gameplay.The Infrastructure organization at Discord is fundamental to our user experience. We handle the real-time delivery of over 40 million events per second and manage the storage of trillions of messages, ensuring robust connections among our vast user base. As a Principal Engineer, you will play a pivotal role in guiding our infrastructure teams, shaping our technical vision, and maintaining the reliability of Discord at a massive scale.This position is ideal for a professional who excels at the intersection of advanced technical skills and organizational leadership. You will contribute to our infrastructure roadmap, address our most challenging technical dilemmas, and ensure our systems can efficiently scale to accommodate the next wave of users.

Principal Software Engineer Saviynt offers an AI-driven identity platform that effectively manages and governs access permissions for both human and non-human entities across all organizational applications, data, and processes. Our clients rely on Saviynt to protect their digital assets, enhance operational efficiency, and lower compliance expenses. Designed for the age of AI, Saviynt is at the forefront of helping organizations safely advance their AI deployments and utilization. As a recognized leader in identity security, we provide solutions that empower and protect some of the world’s leading brands, Fortune 500 companies, and government institutions. For more details, please visit www.saviynt.com. Role Summary In this pivotal role, you will provide technical leadership and extensive knowledge in complex engineering domains, guiding architectural decisions while ensuring scalability, reliability, and quality across key platform components. As a Principal Engineer, you will act as a technical authority, mentor senior engineers, and tackle the most intricate technical challenges. The Connectors team plays a crucial role in facilitating seamless integrations between Saviynt's Identity Governance platform and a multitude of enterprise applications by developing and maintaining robust, scalable connector frameworks. We are committed to ensuring reliable data synchronization, provisioning, and lifecycle management across diverse external systems, forming a vital foundation for the entire platform. What You Will Be Doing ● Design and architect scalable, high-performance connector frameworks for enterprise application integrations.● Define technical standards, best practices, and design patterns for connector development.● Drive architectural decisions for complex integration scenarios involving over 200 enterprise applications.● Evaluate and recommend new technologies, tools, and frameworks to enhance connector reliability and performance.● Lead technical design reviews and provide guidance on system architecture and design trade-offs.

Join Cloudflare as a Principal Software Engineer, where you will play a pivotal role in designing and implementing innovative software solutions. You will collaborate with cross-functional teams to enhance our platform's scalability, security, and performance, making a significant impact on our global user base.

Join Our Team at ConversionAt Conversion, we are pioneering the future of marketing automation through our AI-driven platform, designed specifically for modern software companies. Traditional marketing tools are often outdated and fragmented, leading to ineffective strategies. Our mission is to repair these broken funnels and misaligned messaging.With Conversion, growth teams can manage their entire go-to-market strategy seamlessly within a single interface. From customer acquisition to activation and retention, everything is streamlined, personalized, and enhanced by AI technology.Having secured over $28 million in funding from notable investors like Abstract Ventures, True Ventures, and HOF Capital, we are experiencing rapid growth with over $5 million in ARR and more than 4000 satisfied customers.Our compact yet high-performing team based in San Francisco is looking for passionate individuals who thrive in a creative, product-led marketing environment. If you're eager to collaborate with top-tier talent and contribute to innovative solutions, we want to connect with you!Over $28M raised in funding$0 to $6M ARR achieved in under a year, serving 4000+ customersJoin an elite team with backgrounds from Airbnb, Palantir, Pinterest, IMC Trading, Shopify, LinkedIn, Microsoft, and more

About AnthropicAt Anthropic, we are dedicated to creating AI systems that are not only reliable and interpretable but also steerable. Our mission is to ensure that AI is both safe and beneficial for our users and society at large. Our quickly growing team comprises passionate researchers, engineers, policy experts, and business leaders who collaborate to construct beneficial AI systems.About the RoleWe are seeking talented software engineers to join our Platform organization, where we create foundational tools that enhance product development across Anthropic. You will take ownership of the infrastructure and systems that teams rely on to deliver products reliably and at scale, whether for internal stakeholders or for hundreds of thousands of external users and companies worldwide.This position is ideal for engineers who excel in tackling complex infrastructure challenges and designing systems that are reliable, scalable, and elegant. You will play a pivotal role in defining the performance quality standards for our company, supporting the next generation of LLM-first products, and transforming the developer experience into a best-in-class model.We have several teams actively hiring, and placements will be made post-interview based on your interests and experience, along with our organizational needs. This flexible approach allows us to align talented engineers with the projects where they can have the most significant impact and potential for growth.Platform Acceleration: Your work will focus on maximizing the productivity of our product engineers. You will design and optimize essential development infrastructure that drives our AI product development, including development environments, observability tools, and CI/CD pipelines. Working closely with product teams, you'll identify and eliminate friction points in their development workflows, thus significantly enhancing productivity across our entire product organization and accelerating our mission.Service Infrastructure: We maintain the core systems that underpin Anthropic's engineering efforts, from service mesh and observability systems to deployment pipelines and shared libraries. Our contributions enable product teams to build and operate reliable services at scale, making us a vital multiplier of effectiveness across the entire company.Multicloud: We create and maintain the infrastructure that allows Anthropic to operate seamlessly across multiple cloud providers, emphasizing cloud-agnostic tools, cross-cloud networking, and multi-region deployments.Authentication & Identity: We construct and uphold the critical infrastructure that supports identity management and authentication across Anthropic's platforms.

At Plaid, we envision a future where people's financial interactions are profoundly enhanced. We are committed to driving this change by creating innovative tools and experiences that empower thousands of developers in building their own products. Plaid supports the financial well-being of millions by facilitating seamless connections between users and their financial accounts with the applications they rely on. Our network integrates with over 12,000 financial institutions across the US, Canada, the UK, and Europe. Established in 2013, Plaid is headquartered in San Francisco, with additional offices in New York, Washington D.C., London, and Amsterdam.The Platform Engineering division at Plaid consists of diverse teams focused on essential infrastructure, data management, storage solutions, privacy, and enhancing developer efficiency. Together, these teams ensure that our technology platform remains scalable, robust, and secure to support our rapid expansion. As a Platform Engineer, you will play a vital role in designing, developing, and maintaining the foundational infrastructure and internal platforms that empower all engineering teams at Plaid to innovate swiftly and securely. You will collaborate cross-functionally with product engineering teams to launch new features and uphold operational excellence throughout each product's lifecycle.

In a world where software is rapidly evolving, artificial intelligence (AI) is at the forefront, transforming how we interact with technology. At Scale AI, we recognize the immense potential of AI to enhance human capabilities, offering personalized support across various aspects of life—from coaching and tutoring to shopping and travel guidance. As enterprises, startups, and governments rush to integrate large language models (LLMs) into their operations, it is crucial to ensure these systems are safe, aligned, and effective. This involves rigorous human evaluation and reinforcement learning through human feedback (RLHF) during all stages of model development.Our innovative products, including the Generative AI Data Engine, SGP, and Donovan, are designed to empower the most advanced LLMs and generative models globally. By leveraging world-class RLHF, human data generation, model evaluation, safety, and alignment, we are shaping the future of human-AI interaction.As a member of our Platform Engineering team, you will play a pivotal role in designing and developing the foundational platforms that support Scale's operations. Your responsibilities will include architecting our core cloud infrastructure, enhancing our data lifecycle, and transforming the software development process for engineers at Scale. You will gain invaluable insights into the AI landscape as it develops within diverse sectors.

Mercor’s platform team is looking for a Software Engineer in San Francisco or New York City. The focus is on building and improving the scalable software systems that support the company’s main products. Key responsibilities Design and develop software systems to help the platform grow and stay reliable Add new features and refine existing ones to strengthen platform functionality Collaborate with engineering, product, and design teams to deliver solutions Location This role is based in San Francisco or New York City.

About the TeamOpenAI’s B2B Engineering team is committed to delivering our advanced technology to the world through our developer platform and enterprise products. We develop robust backend systems, APIs, and infrastructure that empower developers and organizations to leverage OpenAI's capabilities in production environments.Our expertise encompasses distributed systems, data infrastructure, platform services, and enterprise-grade features such as security, compliance, authentication, and reliability. We collaborate closely with product, research, design, infrastructure, and forward-deployed teams to transform pioneering AI functionalities into scalable and dependable products.About the RoleWe are seeking a Principal Software Engineer to architect and scale the systems that drive our developer and enterprise-facing products. You will take charge of the design for backend services and platform capabilities that safely and reliably integrate new AI functionalities into production at a global scale.This position covers a wide technical landscape, including distributed systems, APIs, databases, data pipelines, and secure enterprise infrastructure. You will play a pivotal role in shaping both the technical architecture and the product experience of our platform, maintaining high standards for performance, safety, reliability, and API design.ResponsibilitiesDesign, implement, and scale backend services, APIs, and infrastructure supporting OpenAI’s developer and enterprise products.Lead the architectural design of distributed systems, databases, and data pipelines that handle large-scale, high-reliability production workloads.Own key platform capabilities from initial technical strategy and design through implementation, launch, and ongoing operation.Carefully shape API design, treating interfaces as core product touchpoints while ensuring a top-notch developer experience.Create secure, reliable, and compliant systems that cater to both enterprise and developer needs.Work closely with product, research, design, infrastructure, and forward-deployed engineering teams to deploy new capabilities into production.Steer technical direction across complex challenges, making sound architectural trade-offs to balance speed, quality, and maintainability.Enhance engineering productivity by developing internal tools, platform abstractions, and systems that amplify efficiency across the organization.

MidiHealth is seeking a Senior Software Engineer to join the Platform Engineering team. This hybrid role is based in the SF Bay Area and centers on building and enhancing the software that drives MidiHealth’s healthcare technology platform. The work contributes directly to improving patient outcomes through technology. Key responsibilities Design and develop software solutions for the core platform Collaborate with engineering, product, and cross-functional teams to deliver integrated features Support the reliability and scalability of the platform Location This position requires regular on-site work in the SF Bay Area as part of a hybrid schedule.

About AnthropicAt Anthropic, we are dedicated to developing AI systems that are not only safe but also interpretable and steerable. Our mission is to ensure that AI serves the best interests of our users and society at large. Our rapidly growing team comprises passionate researchers, engineers, policy experts, and business leaders, all collaborating to create beneficial AI technologies.About the Role:We are seeking skilled software engineers to join our Platform team. This team is responsible for building the essential foundations that enhance product development across Anthropic. We manage the infrastructure and systems that teams rely on for reliable and scalable deployment to both internal users and hundreds of thousands of external clients worldwide.In this role, you will independently define and scope complex, multi-month projects, fostering cross-organizational alignment in ambiguous problem areas. Your architectural decisions will significantly influence the way Anthropic develops and scales its products. You will collaborate closely with research teams to transform cutting-edge capabilities into market-ready solutions, ensuring a lasting impact on our platforms that serve both internal and external engineering teams.Multiple teams are actively hiring, and team assignments will be determined post-interview based on your skills, interests, and the needs of the organization. This flexible approach helps us align talented engineers with backend product initiatives where they can make the most significant impact and experience growth.Your Responsibilities:Platform Acceleration: You will enhance developer productivity for product engineers at Anthropic. This includes architecting and optimizing critical development infrastructure that fuels our AI product development, encompassing development environments, observability, and CI/CD pipelines. You will work closely with product teams to understand their workflows and eliminate friction points, resulting in a profound multiplier effect across the product organization, thus accelerating our mission.Service Infrastructure: You will build and maintain the core infrastructure that supports Anthropic's engineering efforts, ranging from service mesh and observability systems to deployment pipelines and shared libraries. Your contributions will empower product teams to construct and operate reliable services at scale, positioning you as a critical force multiplier within the company.Multicloud: You will develop and sustain the infrastructure that allows Anthropic to function seamlessly across various cloud providers, focusing on cloud-agnostic solutions that enhance our operational efficiency.

Join the Team at Bretton AIBretton AI stands at the forefront of artificial intelligence in the financial services sector, providing an essential platform that organizations like Robinhood, Mercury, and Gusto rely on to streamline critical tasks, including anti-money laundering and counter-terrorism efforts.With over $95 million raised from renowned investors such as Greylock, Y Combinator, and Thomson Reuters Ventures, we are located in the heart of San Francisco. Our talented team hails from prestigious companies including SpaceX, Google, Netflix, Stripe, and Plaid.Your RoleAs a Platform Engineer, you will be instrumental in constructing and maintaining the infrastructure that underpins our compliance solutions at scale. You will take charge of reliability, performance, and scalability across our core platforms.Your responsibilities will include designing Postgres schemas, optimizing queries, developing high-throughput services, orchestrating long-running workflows with Temporal, and ensuring we maintain a commitment to a remarkable 99.9%+ uptime for our clients who process thousands of cases daily.In this role, you'll produce backend code for production, design distributed systems, and manage the infrastructure that allows our product teams to deploy rapidly and efficiently.Key ResponsibilitiesDevelop APIs and services capable of managing thousands of concurrent requests.Create ingestion → assessment → delivery pipelines for our case management.Implement Temporal workflows to manage long-running, stateful processes.Design and refine PostgreSQL schemas and queries for compliance workflows.Oversee CI/CD, deployments, and infrastructure-as-code while enhancing observability through logging, tracing, and metrics.Troubleshoot slow queries, memory leaks, and race conditions in our production systems.What We're SeekingEssential Qualifications4+ years for Engineer / 6+ years for Sr. Engineer / 8+ years for Staff Engineer in backend or infrastructure roles.Strong understanding of systems fundamentals, including distributed systems, databases, APIs, and concurrency.Demonstrated production experience with live systems, including debugging, incident response, and participation in on-call rotations.