Senior Backend Software Engineer at Sentra | San Francisco

Sentra seeks a Founding Product Designer based in San Francisco or the Bay Area. This position partners closely with company leadership to shape the vision for new products and guide design decisions from the ground up. What you will do Collaborate with leadership to define the direction and vision for Sentra’s products Design user experiences and interfaces starting from the earliest product stages Establish and uphold design standards that will influence the company’s future work Impact The work in this role will directly affect the trajectory of new products and set a foundation for design throughout Sentra.

Position OverviewAt Sentra, we are pioneering the development of organizational superintelligence through innovative memory infrastructure that intelligently processes time, causality, and context. As a Machine Learning Research Scientist, you will address fundamental challenges in knowledge representation, temporal reasoning, and semantic compression. Your mission will be to design and implement sophisticated systems that preserve the execution state for entire organizations, transforming millions of micro-events into robust knowledge and identifying patterns for predicting future events.Key ResponsibilitiesDevelop LLM-powered information extraction pipelines to convert unstructured communications and textual data into structured entity-relationship models.Create memory consolidation algorithms that validate information through multiple observations, merge duplicate entities, and efficiently prune transient data.Architect temporal knowledge graphs that represent organizational execution states as dynamic, continuously updated frameworks instead of static records.Implement graph attention mechanisms and reasoning systems for intricate causal queries regarding blockers, dependencies, and outcome patterns.Conduct research on lossy semantic compression using information-theoretic principles to distill event streams into query-relevant long-term memory.Design entity resolution systems that effectively manage identity evolution, where entities may merge, split, and transform over time.Construct meta-learning systems that uncover organizational patterns and discern when current situations align with historical indicators of success or failure.Innovate privacy-preserving cross-organizational learning approaches utilizing federated learning and differential privacy techniques.Publish research findings and actively contribute to the wider research community focused on knowledge graphs and organizational intelligence.

Join our dynamic team at unify as a Senior Backend Software Engineer, where you will leverage your expertise to design and implement robust backend systems that enhance our product's performance and scalability. You will collaborate closely with cross-functional teams to develop innovative solutions that meet our customers' needs.

About HappyRobotHappyRobot is revolutionizing the real economy with our AI-native operating system designed to bridge the gap between intelligence and action. By integrating real-time insights with specialized AI capabilities, we empower enterprises to manage complex operations autonomously.Our AI OS continuously accumulates knowledge, optimizes various processes, and adapts over time. We are initially focusing on supply chain and large-scale industrial operations, where speed, resilience, and ongoing improvement are paramount—allowing human resources to concentrate on strategic and creative high-value tasks.Discover more about our vision in our Manifesto. So far, HappyRobot has successfully raised $62M in funding, including a recent $44M in Series B financing as of September 2025. Our esteemed investors include Y Combinator (YC), Andreessen Horowitz (a16z), and Base10, who share our mission to transform enterprise operations. We are leveraging this investment to build a top-tier team of individuals with unwavering motivation, exceptional problem-solving capabilities, and a drive to exceed limits in a dynamic working environment. If this resonates with you, we want you at HappyRobot.About The RoleAt HappyRobot, our Senior Backend Software Engineers are entrusted with significant components of our product and infrastructure, overseeing projects from inception to deployment. We are seeking passionate builders who thrive in uncertain environments, value craftsmanship, and desire genuine ownership of their creations.

Join Kiddom as a Senior Backend Software EngineerAt Kiddom, we are revolutionizing the education landscape by providing a platform that champions equity and growth for all students. Our innovative approach integrates top-tier instructional materials with engaging digital learning tools, allowing schools and districts to take charge of their curriculum. With our exceptional curriculum management capabilities, we deliver personalized learning experiences that cater to the specific needs and aspirations of local communities. Our robust data insights empower educators and leaders to enhance instructional strategies, improve school programs, and foster professional development.We are seeking a dedicated Senior Backend Software Engineer to join our dynamic team, where you will play a crucial role in creating the next generation of scalable backend services. Your responsibilities will include the design, development, and maintenance of high-performance systems that underpin our applications.The ideal candidate will possess significant experience in backend technologies and system architecture, coupled with a genuine passion for addressing complex challenges faced by our users. Mentoring fellow engineers and sharing your expertise will be key aspects of this role. A strong affinity for education, an understanding of teachers' needs, exceptional product insight, and a commitment to Kiddom's mission and vision are essential.

Astranis is at the forefront of satellite technology, constructing advanced satellites for high orbits that extend humanity's capabilities into the solar system. Our satellites deliver dedicated, secure networks to a diverse clientele, including major corporations, government entities, and the US military. With five satellites successfully in orbit and numerous launches on the horizon, we are addressing a robust pipeline of over $1 billion in commercial contracts.As a trusted satellite communications partner, Astranis meets the rigorous demands for uptime, data security, network visibility, and tailored solutions. With over $750 million raised from distinguished investors like Andreessen Horowitz, Blackrock, and Fidelity, we have a thriving team of 450 engineers and innovators. Our operations are conducted from our expansive 153,000 sq. ft. headquarters located in Northern California, USA.Senior Software Engineer - BackendJoin our dynamic Platform team as a Software Engineer, where your role will involve designing and developing services that autonomously manage satellites, monitor telemetry for anomalies, and provide real-time situational awareness to ensure the safety and operational integrity of our fleet. You will play a crucial role in building the foundational components and services that empower our software organization, enabling all teams to operate more efficiently and reliably.In this position, you will help shape the core software that our satellites rely on for flawless performance.This role encompasses contributions to both our commercial and US government initiatives.Key ResponsibilitiesDevelop and implement high-performance, reliable, mission-critical software for satellite command operations.Take full ownership of features, collaborating across backend and infrastructure.Work with interdisciplinary teams to define software requirements, architectures, and designs.Continuously evaluate the evolving technology landscape and advocate for innovations to enhance our systems.Mentor colleagues, share insights, and elevate the technical standards within the team.

Join Databricks as a Senior Backend Software Engineer and contribute to solving some of the world's most challenging problems. We empower data teams through our state-of-the-art data and AI infrastructure platform, enabling businesses to leverage deep data insights for transformative growth. At Databricks, founded by engineers and driven by a customer-first philosophy, we tackle technical challenges with enthusiasm — from designing next-gen UI/UX for data interfacing to scaling our services across millions of virtual machines.In this role, you will collaborate closely with your team to develop scalable infrastructure and innovative products for the Databricks platform.

About UsOur mission is to revolutionize language learning.Learning a new language can transform lives by providing access to diverse cultures, career opportunities, and communities. With two billion people globally striving to learn languages, the most effective method—one-on-one tutoring—remains difficult to access at scale and has not evolved significantly over the years. Speak is developing an AI-powered, human-like tutor that fits in your pocket, offering a conversation-first approach that allows learners to practice speaking, receive immediate feedback, and progress through thoughtfully designed lessons. This results in a comprehensive journey from novice to confident speaker across multiple languages.Since our launch in South Korea in 2019, Speak has emerged as the leading language learning app, now available to learners in various markets and over 15 languages. As one of the foremost AI companies globally, we have secured over $150 million in venture capital from notable investors such as OpenAI, Accel, Founders Fund, and Khosla Ventures, with a diverse team spread across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.About This RoleWe are seeking a Senior Backend Engineer, with full-stack capabilities, to help create innovative AI-driven product experiences. The ideal candidate should have experience collaborating closely with product, design, and machine learning teams, alongside a proven track record in developing polished consumer applications. This role is pivotal in shaping our latest products focused on programmatic, conversational language learning and will significantly impact the future direction of our company.Your ResponsibilitiesCrafting innovative AI-driven product experiences and user interfaces for the web.Full-stack engineering with a primary focus on designing scalable backend systems.Troubleshooting complex streaming challenges.Taking ownership of the complete development cycle of features from ideation to production.Writing code efficiently, shipping frequently, and making a substantial impact on our business by facilitating the scaling of our content.Your Profile5+ years of industry experience as a Backend Engineer, ideally within a fast-paced startup environment.Bonus: Experience on an app that has reached over 1 million users.Exceptional problem-solving and communication skills, along with the ability to work effectively in a collaborative environment.

About SemgrepSemgrep stands at the forefront of code security, enabling developers to innovate seamlessly. Our platform empowers teams to identify, flag, and address real vulnerabilities before deployment, with security solutions that evolve alongside their coding efforts. By securing code during its creation, Semgrep provides essential guardrails, allowing developers to work swiftly while ensuring their safety. With a focus on integration, Semgrep offers visibility, control, and confidence to security teams, making it an indispensable tool for modern developers. Our AI-driven approach minimizes false positives and highlights actionable vulnerabilities, with validation from 95% of security experts across over 6 million findings. In our mission to eliminate false positives, our AppSec teams experience an 80% reduction in false positives across Code and Supply Chain, significantly alleviating backlog issues.Founded in San Francisco and supported by prestigious investors such as Menlo Ventures, Felicis Ventures, Lightspeed Venture Partners, Redpoint Ventures, and Sequoia Capital, Semgrep is recognized by Gartner in Application Security Testing and trusted by leading companies including Snowflake, Dropbox, and Figma. Discover more about us at semgrep.dev.About the RoleAs a Senior Backend Engineer, you will be instrumental in enhancing our backend and infrastructure systems to ensure a robust and efficient user experience for all our customers. You will collaborate with fellow engineers to design and develop APIs, data models, and services that power Semgrep’s scalable products. A solid understanding of databases, query optimization, and distributed systems is essential, as is the ability to integrate third-party services into existing first-party code.Our technology stack includes Typescript and React on the Frontend and Python, Flask, and SQLAlchemy on the Backend, deployed using Kubernetes and hosted on AWS. While professional experience with these technologies is preferred, we welcome candidates who are eager to learn them quickly!This position is hybrid, requiring at least 3 days a week in our San Francisco, New York, Boston, or Denver offices, depending on your team. We also consider remote work for exceptional candidates.CompensationThe estimated starting annual salary for this role ranges from $160,000 to $207,000 USD. The actual salary will be determined based on various factors, including job-related skills, relevant experience, qualifications, location, internal equity, and market data. In addition to the base salary, total compensation may include equity, variable compensation, and benefits.

About CasapCasap is an innovative Series A startup backed by over $30M in funding from renowned investors such as Emergence, Lightspeed, and Primary Ventures. Located in the vibrant tech hub of San Francisco, our team consists of experienced product leaders from industry giants like Robinhood and Chime. Our mission is to revolutionize banking operations by automating disputes and combating friendly fraud. Our solutions have garnered love and appreciation from everyday users and major financial institutions alike.We are currently seeking skilled Backend Engineers to join our team in San Francisco, eager to enhance the banking experience with our rapidly growing product that sits at the cutting edge of automation and Artificial Intelligence.

Join 10alabs as a Backend Software Engineer where you will play a vital role in designing and developing robust backend systems. You will work closely with cross-functional teams to create scalable and efficient software solutions that meet the needs of our clients. If you are passionate about technology and eager to tackle complex challenges, we want to hear from you!

Role OverviewLocated in the heart of San Francisco, CA, this position is integral to our headquarters and does not support full-time remote work.Compensation for this role ranges from $150,000 to $250,000 annually, depending on experience, along with equity and comprehensive benefits.About FurtherAIAt FurtherAI, we are pioneering advanced AI agents tailored for the insurance sector, a market primed for innovation worth trillions. Having successfully secured over $30 million from prestigious investors such as Andreessen Horowitz, Y Combinator, Nexus, South Park Commons, and Converge, we've experienced a remarkable tenfold revenue growth this year. Our clientele includes some of the most renowned names in insurance, including a top 5 global insurance company. Our team merges profound AI knowledge with extensive entrepreneurial experience.We are currently seeking an extraordinary Software Engineer to join our foundational team and help shape our product and organizational culture.Why Work With Us?Accelerated Growth: Experience rapid revenue growth post-product-market fit.Exceptional Team: Our founding group features talents from Apple AI Research, four ex-Y Combinator founders, and six successful entrepreneurs. Our engineering team boasts backgrounds from Apple, Microsoft, Google, and Amazon.Deep Technical Challenges: Collaborate with a staff research scientist and a team of seven engineers tackling advanced AI and scalable backend solutions.Significant Market Influence: Our work is transformative, reshaping the insurance industry's operational landscape.Entrepreneurial Spirit: Ideal for those looking to take ownership of critical product areas and possibly launch their own ventures in the future.Your ResponsibilitiesDevelop and enhance the core product, ensuring optimal performance, reliability, and ongoing improvements.Take charge of substantial elements of the backend architecture using Python.Work closely with founders to define and guide the technical roadmap.Embrace a culture of extreme ownership within a dynamic, high-performance environment.Engage in-person at our San Francisco office (5 days a week).

About UsAt Amari AI, we are transforming the logistics industry by replacing outdated manual workflows with intelligent AI agents. Our cutting-edge technology collaborates with human operators, automating complex, document-heavy processes to enable faster, more accurate shipment processing.Having surpassed the initial development phase, we have successfully achieved product-market fit and are experiencing exceptional growth, with over 100% month-over-month revenue increase. With $5 million raised from notable investors including First Round Capital and Pear VC, we are expanding our platform's capabilities. Our highly skilled team is composed of experts from leading tech companies such as Google, LinkedIn, and Salesforce, as well as prestigious academic institutions and AI research facilities.The RoleIn the capacity of Senior Backend Engineer at Amari AI, you will play a pivotal role in shaping the core data infrastructure that drives our AI-powered logistics platform. This position offers substantial ownership and autonomy, allowing you to design and scale systems responsible for ingesting, processing, and delivering real-time logistics data across various AI components, including pipelines, queues, databases, and search layers. Your technical leadership will significantly influence product reliability and performance from the outset.What You’ll DoDesign and scale distributed backend systems - including queue pipelines, service boundary definitions, and robust failure management strategies such as retry mechanisms, circuit breakers, and graceful degradation.Manage database design and reliability - focusing on schema design, indexing strategies, and query optimization tailored to specific use cases, along with data pipelines that maintain synchronization across systems at scale.Develop AI-driven search infrastructure for real-time logistics lookups and enhanced AI features.Provide technical leadership in a dynamic startup environment - establishing engineering standards, collaborating closely with the founders on strategic roadmaps, and mentoring future backend engineers.Who We're Looking For5–8 years of professional experience in backend software engineering, preferably in high-growth startups or large-scale production environments.Proven track record of end-to-end ownership of backend systems in fast-paced, ambiguous settings.Demonstrated capability in making informed architectural decisions under time constraints, with flexibility to adapt as requirements evolve.

At Hover, we empower individuals to design, enhance, and safeguard the properties they cherish. Utilizing our proprietary AI, developed over more than a decade of extensive real estate data, we address pivotal queries such as “What will it look like?” and “What will it cost?”. Homeowners, contractors, and insurance experts depend on Hover for precise measurements and interactive 3D models of properties, all achievable through a quick smartphone scan.Driven by curiosity and purpose, our team is dedicated to serving our customers and communities. We believe that the best innovations stem from diverse perspectives and take pride in fostering an inclusive, high-performance culture that encourages growth, accountability, and excellence. Supported by renowned investors like Google Ventures and Menlo Ventures, and trusted by industry leaders such as Travelers, State Farm, and Nationwide, we are transforming how people perceive and interact with their environments.Why Hover Wants YouWe are in search of a proactive full-stack engineer who is committed to crafting reliable, high-quality systems that create real-world impact.Our Mobile team comprises a close-knit group of engineers specializing in Rails, iOS, React Native, and Android, all of whom are dedicated to their craft and customer experience. We develop and refine the mobile platform that is central to Hover’s operations — the systems that convert real-world property data into accurate 3D models and measurements, utilized daily by contractors and insurers. We collaborate seamlessly across engineering, product, and design to enhance core customer journeys while scaling our platform with confidence.In this role, you will engage with all layers of the technology stack — designing scalable backend APIs, optimizing data flows, and enhancing user-friendly frontend experiences — all aimed at building products that are high-performing, resilient, and meticulously designed. If you are excited by the challenge of solving intricate system problems and want your contributions to have a visible, measurable effect, this is where you can excel.

About HappyRobotHappyRobot is a pioneering AI-native operating system designed for the real economy. We bridge the gap between intelligence and action by integrating real-time insights, specialized AI operatives, and orchestrating intelligence. Our technology empowers enterprises to manage complex, mission-critical operations with genuine autonomy.Our AI OS continually enhances knowledge, optimizes processes, and adapts over time. We are focusing initially on supply chain and large-scale industrial operations, where resilience, speed, and ongoing improvement are crucial—allowing humans to concentrate on strategy, creativity, and other high-value activities.Discover more about our vision in our Manifesto. To date, HappyRobot has secured $62M in funding, including a recent $44M Series B round in September 2025. Our investors include Y Combinator (YC), Andreessen Horowitz (a16z), and Base10—partners who share our commitment to transforming enterprise operations. We are channeling this investment into building a world-class team—individuals with relentless drive, exceptional problem-solving abilities, and a passion for pushing boundaries in a dynamic, high-intensity setting. If this resonates with you, consider joining HappyRobot.About The RoleAt HappyRobot, Backend Software Engineers take ownership of critical components of our product and infrastructure from inception to deployment. We are seeking passionate builders who excel in uncertain environments, value craftsmanship, and desire true ownership of their creations.

Join Our Innovative Team at ClericAt Cleric, we are on a mission to develop a cutting-edge autonomous AI agent designed to investigate and resolve production incidents efficiently. Our state-of-the-art agent utilizes large language models (LLMs) alongside advanced tools to comprehend complex systems, analyze problems, and implement corrective measures, even for unprecedented issues.Our technology is already making waves in high-scale companies across various sectors, including fintech, ride-sharing, and autonomous vehicles.About the RoleWe are seeking a talented Backend Software Engineer to join our dynamic team in scaling our autonomous agent technology. This position is perfect for engineers eager to develop, deploy, and enhance AI systems within real-world environments.You will collaborate closely with senior engineers on agent reasoning, integrations, and runtime systems, playing a pivotal role in delivering impactful customer-facing features.Your ResponsibilitiesEnhance capabilities of our autonomous agent and streamline tool execution workflowsDevelop and expand integrations with existing production systemsAssist in creating tools for agent evaluation and observabilityPartner with senior engineers to design, implement, and deliver new featuresGain insights into building reliable AI systems for production environmentsQualifications1–2 years of professional experience in software engineeringStrong understanding of software engineering principles and system designProficiency in Python (familiarity with other programming languages is a plus)A keen interest in AI, machine learning, and agentic systemsA passion for rapid learning and tackling real-world production challengesPreferred SkillsFamiliarity with AI/ML systems or LLM-based productsExperience with distributed systems or cloud infrastructureBackground in startup or fast-paced team settingsOur Work CultureSmall teams that create a significant impactEncouragement of radical candor in a supportive environmentEmphasis on in-person collaborationAn AI-first approach in all our endeavors

About braintrustBraintrust is at the forefront of AI observability, merging evaluation and observability into a seamless workflow. Our platform empowers developers to gain critical insights into AI behavior in production environments and provides tools for optimization.Renowned companies such as Notion, Stripe, Zapier, Vercel, and Ramp leverage Braintrust to assess models, test prompts, and identify regressions, transforming production data into enhanced AI performance with each update.About the RoleWe are seeking a passionate Backend Engineer to contribute to the foundational infrastructure of innovative AI development tools.Braintrust operates as a real-time, highly available data platform within both SaaS and self-hosted ecosystems. Your contributions will be pivotal in scaling our data ingestion pipelines, enhancing our open-source libraries, and ensuring optimal system performance and reliability. If you excel in a dynamic environment and relish tackling complex systems challenges with a product-oriented mindset, we would love to collaborate with you.Your ResponsibilitiesAs a Backend Engineer at Braintrust, you will play a key role in shaping the core platform that facilitates LLM-native development:Design and deploy features that provide users with profound insights into their LLM utilization and performance metrics.Integrate, proxy, cache, and aggregate data from leading model providers such as OpenAI, Anthropic, and Gemini, which our clients depend on.Create and refine robust, efficient open-source libraries for tracing and evaluating LLM calls within client applications. Explore our SDKsDevelop highly available real-time data pipelines to ingest, store, and query extensive volumes of structured and semi-structured AI usage data.You will also collaborate closely with product engineers to deliver polished, comprehensive features that address real customer challenges, including:Bundling and uploading JavaScript and Python code snippets for on-demand function calls in LLM workflows.Facilitating the parsing and uploading of attachments from LLM multimodal outputs for long-term storage.Implementing role-based access controls and data retention protocols for enterprise scenarios.

Join Perplexity as a Senior Backend Software Engineer and help transform how users engage with the internet. As a key member of our dynamic team, you will lead the design, implementation, and scaling of backend systems that drive our web, mobile, and browser applications.Our Technology Stack: Python | Go | Rust | TypeScript | FastAPI | PostgreSQL | Redis | Docker | vLLM | AWSTeams HiringFile AgentThe File Agent team is at the forefront of building a scalable and secure platform for intelligent file editing and processing. Your expertise will help design the infrastructure and APIs that empower agents to autonomously edit and generate files across various formats.Enterprise GrowthThe Enterprise Growth team develops core platform capabilities that ensure Perplexity is a trusted solution for enterprise customers. This includes managing enterprise authentication, onboarding processes, and providing in-depth admin control and visibility.GrowthThe Growth team influences how millions interact with Perplexity by rapidly experimenting and implementing new features aimed at enhancing user experience and promoting user retention and revenue growth.CommerceThe Commerce team is responsible for the complete commerce stack, including payments infrastructure and monetization strategies. Your role will involve scaling billing systems across consumer and enterprise plans.

Join Our TeamAt Stytch, we pride ourselves on being the premier identity platform tailored for developers. Our innovative features, such as device fingerprinting and secure account takeover-resistant authentication, empower businesses to manage identity and access with confidence. As a Senior Software Engineer, you will collaborate closely with leadership to elevate our product experiences to unparalleled levels. Your role will involve architecting solutions across our technology stack, overseeing the design and implementation of team projects, and focusing on the most vital initiatives on our product roadmap.This is a hybrid full-time role based in the SF Bay Area. While we value in-office collaboration, we understand the importance of flexibility. We aim for team members to work in the office three days a week, fostering strong connections while allowing for remote work flexibility.What Inspires YouA collaborative workspace that allows you to see the direct impact of your work on user experience.A passion for mentoring fellow engineers and nurturing the next generation of engineering leaders at Stytch.The ability to envision future system designs while delivering incremental improvements and making strategic trade-offs to accelerate value delivery.A deep pride in your code, with a commitment to writing, reviewing, and maintaining high-quality software.An eagerness to shape team culture and drive growth through effective recruitment of senior engineers and streamlined operational processes.A desire to create user-friendly products that simplify the lives of developers both internally and externally, enhancing the experience for Stytch's customers.What We Seek5+ years of experience as a backend or backend-focused full-stack engineer.Basic familiarity with frontend technologies (ability to debug frontend as necessary; frontend expertise not mandatory).Experience with Go, Node.js, TypeScript, and React.