Senior Backend Engineer

Since the inception of aviation, pilots have consistently battled air resistance, akin to sailors managing the friction of water. Amid this ongoing challenge, the trim tab stands out as a brilliant yet understated innovation. Just as the wheel transformed land transportation by facilitating movement, the trim tab enhances flight, enabling smoother navigation through the skies. It exemplifies the beauty of simplicity in engineering, turning the demanding task of aircraft control into a more refined and manageable experience. At Mercury, we are dedicated to creating a remarkable banking experience for startups. Our team is deeply committed to ensuring our product not only satisfies but anticipates the evolving needs of our customers. Our product engineering team is expanding, and we are eager to bring on senior backend engineers. We are a group of practical, product-focused engineers driven by the desire to develop products that rescue our customers from the frustrations of outdated, costly industry tools. In this role, you will: Embrace a strong sense of product ownership and proactively seek responsibility—our team often self-organizes on small to medium-sized projects, and we are looking for someone enthusiastic about shaping and building the future of Mercury. Thrive in an autonomous environment with a close-knit team, embodying a “startup within a startup” culture. Collaborate closely with designers and product leaders to deliver delightful experiences, aiming to elevate the standard of banking and fintech software. Many of our customers are startups who value our sleek and intuitive designs. Join a team of seasoned product engineers within one of our Mercury product groups, such as Banking, Experiences, Expansion, or Risk.

About UsWe are an innovative stealth-mode company funded by a16z Speedrun, dedicated to empowering leading consumer brands to achieve exceptional growth. Our cutting-edge solutions have gained the trust of pioneering organizations like Higgsfield and Promova among others. As we expand, we seek talented individuals who are eager to make a significant impact in the realm of consumer technology. You will be part of a passionate team at a crucial juncture, thriving in an environment that champions initiative, ambition, and creative solutions.The RoleAs a Senior Backend Engineer, you will be instrumental in developing and maintaining the essential backend infrastructure that powers our products. Your responsibilities will include:Designing scalable architectures that effectively support new product features and business objectives.Leading the development, deployment, and optimization of backend services to ensure top performance, reliability, and maintainability.Collaborating with cross-functional teams to seamlessly integrate third-party platforms, APIs, and cutting-edge AI technologies.Facilitating technical discussions, providing mentorship, and sharing best practices with fellow team members.Actively contributing to the continuous enhancement of our engineering standards and development workflows.Proactively identifying and addressing complex technical challenges to ensure stable and secure operations.What We ExpectA minimum of 5 years of professional experience in backend development, showcasing a history of delivering reliable and scalable systems.Advanced expertise in server-side programming and experience in designing database-driven applications.A solid understanding of API development, systems integration, and software engineering best practices.Proven experience in building and maintaining production environments that scale effectively for real users.An independent, proactive approach to problem-solving, coupled with the ability to drive projects forward.A commitment to joining our team full-time, with a desire to grow within a fast-paced, ambitious startup.How to ApplyPlease send us a brief introduction about yourself, along with a description of a technical project or system you are most proud of. We are excited to learn how you can contribute to our vision and success.

Join PlasmidsaurusAt Plasmidsaurus, we're dedicated to pioneering new cures and fostering a healthier planet by empowering scientists to achieve unprecedented productivity. Our sequencing services are utilized daily by a diverse range of innovators, including Nobel Prize winners, Fortune 100 pharmaceutical companies, and over 70,000 scientists globally.We initiated a revolution in plasmid sequencing, drastically reducing costs and shortening timelines through cutting-edge sequencing technologies and a worldwide network of laboratories that convert samples into insights within hours instead of weeks.As we extend our innovative model across the genomics landscape, our latest RNA-seq service is a significant leap towards our goal of sequencing everything, providing scientists everywhere with quicker, simpler, and more affordable access to essential data that fuels discovery.Every member of the Plasmidsaurus team plays a pivotal role in shaping the future of biotech research. Together, we're constructing the most efficient sequencing engine in the world that operates overnight, scales globally, and accelerates scientific breakthroughs like never before.Position OverviewAs a Backend Product Engineer, you will be instrumental in developing robust backend services that drive our influence in the biotech sector. Your responsibilities will include:Creating REST APIs to facilitate seamless integration of DNA sequencing results into lab notebooks for our customers.Designing and implementing services and APIs to enhance our rapid operations, coordinating couriers, laboratories, and robotic systems across the globe.Developing high-performance payment services to optimize billing, invoicing, and product pricing.Building scalable backend systems capable of processing terabytes of sequencing data daily, thereby supporting our frontend bioinformatics analytics tools.Company CultureWe seek individuals who:Thrive in a high-agency and high-ownership environment.Are eager to learn from the expertise of others in scientific and biological fields.Are passionate about making a meaningful impact in the scientific community, contributing to the development of the next generation of medicines, biotechnology, and even plant-based alternatives!Can independently lead projects from conceptualization to production.

tvScientific, now part of Pinterest, develops a connected TV advertising platform designed for performance marketers. The team brings together expertise in data, automation, and digital media to help brands buy, optimize, and measure TV ads more effectively. The platform integrates media buying, optimization, measurement, and attribution, aiming to offer advertisers a dependable way to grow through CTV. Role overview The Senior Backend Engineer will design, build, and scale systems that manage contracts and billing for direct advertisers, internal teams, and the Finance department. This work centers on backend services that support a range of contract types and billing models, with a focus on accuracy, auditability, and operational reliability. What you will do Architect and develop backend services for contracts and billing Support multiple contract structures and billing models Ensure system correctness and auditability Maintain operational reliability as the platform expands Work on systems that manage complex commercial relationships and external partners Keep contract logic consistent, adaptable, and maintainable Where this role fits This senior backend engineering role connects revenue, finance, and customer operations. Success in this position requires clear domain modeling, strong data integrity, and disciplined engineering practices. Location Based in San Francisco, CA, or remote within the United States.

About MetaviewAt Metaview, we are revolutionizing the workplace by eliminating the burdens of toil, the barrier to progress. We believe in the power of Human-Computer Symbiosis to enhance productivity.Our AI copilot transforms how hiring is approached, leading to:Increased flow-state, reduced toil.Enhanced insights, less guesswork.Focus on human-centricity over process-centricity.Founded in 2018 by Siadhal and Shahriar, both ex-Uber and Palantir employees, Metaview has grown to support thousands of users at leading companies like Quora, Robinhood, Brex, Elastic, and Replit. We're proud of our small yet high-performing team, dedicated to doing great work.About the RoleAs a Product Engineer at Metaview, you will embody a customer-centric and product-focused mindset. You will lead the design, development, and operational aspects of our products, taking ownership of your work in a collaborative and dynamic environment.While we seek a full stack talent, this role is geared toward those who lean towards backend development. Your primary responsibilities will revolve around backend coding, but you will also engage with other parts of the stack to maintain high productivity.We value clean and effective coding, and while familiarity with languages and tools is appreciated, a willingness to learn and adapt is essential as our product continually evolves. Currently, our technology stack includes:Python for backend application development.Typescript and React for frontend application development.Serverless Framework for application management.

About Us:At ResiQuant, we are dedicated to addressing a critical challenge in disaster resilience: the availability of accurate, standardized, and dynamic property data. As climate change and natural disasters such as earthquakes, hurricanes, and wildfires increasingly affect our world, informed risk decisions are often made with incomplete or erroneous data.Our mission is to equip insurers, financial institutions, and asset managers with AI-driven systems that integrate structural engineering knowledge. These systems help to bridge crucial data gaps, providing precise, actionable insights into buildings for improved decision-making.Founded by Stanford PhDs, we are devoted to utilizing state-of-the-art AI technologies to safeguard communities and businesses against the impacts of disasters. At ResiQuant, we envision a future where every organization has access to premier property risk intelligence, fostering resilience and protecting what matters most.The RoleIn this position, you will design and manage the backend systems that drive AI-powered property risk intelligence at enterprise scale. You will be responsible for creating APIs, data pipelines, and model-integrated services that provide reliable, real-time insights trusted by insurers for billion-dollar underwriting decisions. As an integral member of our early team, you will collaborate closely with the founders to establish the technical foundation of the platform and ensure that cutting-edge AI is applied safely and effectively within the insurance sector.What You’ll DoTake ownership of backend features from design through to deployment.Design scalable services and integrations tailored for Fortune 500 insurers.Construct pipelines to ingest, validate, and transform extensive property datasets.Develop and enhance AI-assisted backend functionalities (API design, retrieval-backed features, monitoring).Ensure observability, reliability, and performance across all systems.Work collaboratively with founders, engineers, and customers to rapidly iterate on impactful features.Who You Are0–5 years of engineering experience (1–3 years preferred). Outstanding new graduates are encouraged to apply.Bachelor’s degree in Computer Science or a related field.Proficient in Python, databases, and cloud platforms (AWS/GCP).Experience in delivering AI-assisted or data-intensive services (e.g., model APIs, retrieval pipelines).Strong understanding of backend engineering principles and practices.

About Sprinter Health:At Sprinter Health, we are dedicated to transforming healthcare accessibility by delivering services directly to patients' homes. Approximately 30% of patients in the U.S. forgo essential preventive or chronic care due to transportation challenges, often leading them to the emergency room as their first point of contact with the healthcare system, resulting in over $300 billion in avoidable costs annually.Leveraging cutting-edge technologies that drive leading marketplace and last-mile platforms, we prioritize delivering care where it is needed most. To date, we have successfully assisted over 2 million patients across 22 states and conducted more than 130,000 in-home visits, boasting a remarkable 92 Net Promoter Score (NPS). With a team of skilled clinicians, technologists, and operators, we have raised over $125 million from esteemed investors such as a16z, General Catalyst, GV, and Accel, ensuring a strong multi-year runway for our initiatives.About the Role:We are seeking an experienced Senior Backend or Full-Stack Software Engineer with a minimum of 5 years of experience who is eager to create the foundational systems that enable last-mile healthcare delivery. In this role, you will engage in developing products that integrate logistics, patient experience, safety, and medical operations. You will be responsible for building and scaling backend services, data flows, integrations, and product experiences that are critical to patient care. Your responsibilities will include routing clinicians, managing booking flows, integrating medical devices, and mitigating clinical errors, allowing you to manage complex, high-impact systems from inception to execution. If you are passionate about solving real-world problems through coding and delivering products that enhance healthcare access, we invite you to apply.Work Environment:As a hybrid company based in the Bay Area, we have offices in both San Francisco and Menlo Park. We value work-life balance and understand that flexibility is essential at times.

About the RoleWe are seeking an experienced Senior Backend Engineer to join our dynamic team at Replo. In this pivotal role, you will focus on designing and enhancing the system architecture for our most sought-after products.Key ResponsibilitiesYour primary focus will be on architecting and developing backend systems using Typescript and Node.js. Here are some specific examples of what you will be working on:Creating a robust ingestion pipeline for our analytics and insights products, ensuring over 99.99% uptime with technologies like Kafka, Clickhouse, and Redis.Improving the stability of our CI/CD processes.Developing a durable and distributed cart/hosting solution for our e-commerce platform.Deploying a multi-tenant NextJS application for shops utilizing Cloudflare.Mentoring junior engineers and promoting best practices in software development.What We’re Looking ForAbility to work on-site 3-4 days per week in San Francisco.Extensive knowledge of distributed systems and Service-Oriented Architecture (SOA), including load balancers, databases, queuing systems, caching, HTTP protocols, APIs, high availability, fault tolerance, and redundancy.A willingness to engage in full-stack development, including front-end tasks when necessary.A proactive approach to shipping features quickly; at Replo, we prioritize action over extensive planning.4+ years of professional experience working with production distributed systems and service-oriented architecture.Proficient in Typescript. Familiarity with Python, Go, or Java is a plus, provided you are eager to learn Typescript/Node.js. Experience with React is also beneficial, and we can provide training if needed.A strong product and customer-oriented mindset.Experience with challenges related to deployment and maintenance of backend systems, along with a solid opinion on best practices for system architecture.A commitment to writing clean, maintainable code, including thorough documentation.Comfortable navigating ambiguity and defining software architecture patterns to address customer pain points.Bonus QualificationsPrevious experience in starting a company.A passion for participating in hackathons.Engagement in open-source projects.

At Julius, we are experiencing rapid growth, connecting with millions of knowledge workers. We invite a talented backend engineer to join our dynamic and highly skilled team, dedicated to transforming AI-powered code execution and data analysis.As a Senior Backend Software Engineer, you will take the lead in designing, implementing, and scaling the systems that drive our web and mobile applications.Your Responsibilities:Develop innovative products that integrate AI capabilities for millions of knowledge workers.Architect and enhance backend systems that support the core functionalities of Julius.Create robust interfaces between backend systems and web/mobile clients.Focus on scaling and load balancing of web server backends to meet evolving demands.Qualifications:Proficient in Python or a similar backend programming language.Extensive experience with database management, pooling, and concurrency.Familiarity with cloud services such as AWS, GCP, or Azure.Knowledge of infrastructure tools like Kubernetes and Terraform (or a desire to learn).Strong skills in designing extensible systems.Minimum of 2 years of engineering experience.Bonus: Experience with R programming language.Bonus: Prior work on AI side projects and interest in experimenting with LLMs.About Julius:Location: San Francisco, CA Type: Full TimeCompensation: Competitive base salary with significant equity options.Benefits: Comprehensive health and dental coverage, gym reimbursement, and daily team lunches.We are an innovative applied AI lab focused on creating coding agents. Our mission is to empower one billion individuals to become software creators, starting with data science and analysis applications. Our users include professionals from finance, operations, scientific research, and academia.

About WorkWhileAt WorkWhile, we are dedicated to empowering hourly workers to achieve financial stability and improved quality of life. With over 80 million Americans engaged in hourly employment, many face unpredictable schedules, low wages, and scarce benefits, which can lead to economic hardship.Our innovative platform is transforming the landscape of frontline work by fostering a more adaptable and effective labor market. Leveraging advanced AI technology, WorkWhile enables businesses to swiftly connect with top-tier talent. Workers enjoy same-day pay, complimentary telehealth services, opportunities for skill advancement, and the flexibility to select shifts that align with their expertise and personal schedules.Our ambitious aim is to harmonize incentives and address inefficiencies in the labor market, challenging the $650 billion staffing and recruiting industry. Supported by Khosla Ventures and celebrated by the Inc. 5000 for remarkable growth, WorkWhile is at the forefront of redefining the future of work.

About CasaAt Casa, we believe that homes are among life’s most cherished assets, yet the experience of homeownership can often be frustrating. We are on a mission to revolutionize this experience by creating a next-generation personal property management solution tailored for single-family homes, ensuring that owning a home becomes a delight.Founded by early visionaries from Uber, CloudKitchens, and Levels, Casa is proud to be supported by a remarkable group of leading venture capital firms and angel investors. Our service is already live and delivering value to paying members.About the RoleWe are seeking a pioneering Senior Backend Engineer to join our dynamic team. In this role, you will be instrumental in designing, developing, and deploying robust backend systems that provide exceptional value to our members.You will collaborate closely with our founders, fellow engineers, and designers to craft innovative and impactful products. Your contributions will be vital in shaping our core systems and defining the culture of our founding team.Key ResponsibilitiesArchitect and develop scalable, secure, and reliable backend systems.Design and implement APIs that enhance our iOS applications and other client interfaces.Optimize the performance and scalability of our services to accommodate an expanding member base and increasing data volume.Stay updated with the latest advancements in backend technologies and cloud infrastructure, integrating new methodologies as suitable.Mentor a growing engineering team through code reviews and constructive feedback to uphold high-quality standards.About YouYou are passionate about building robust systems. You possess a deep understanding of backend architecture, API design, and database management, and are eager to construct systems that can scale with our increasing member base.You are excited to be a founding engineer at an early-stage startup, ready to contribute to the structure and systems being established, while also shaping the company culture.You thrive on building. You embrace the challenges and opportunities for growth that come with joining an early-stage company, and you excel in a fast-paced, evolving environment.You think and act decisively. Your proactive mindset will contribute significantly to our mission.

Join Monaco, the pioneering revenue engine tailored for startups. We are on a mission to revolutionize the way businesses engage with their customers by creating an AI-driven platform that replaces outdated CRMs and fragmented sales solutions. As a Backend Product Engineer, you will play a vital role in shaping Monaco’s core product, collaborating closely with our product and design teams to transform abstract ideas into tangible features that our customers rely on daily. This position offers a hands-on opportunity with significant ownership, taking you from the initial prototype phase through to production and beyond.

Who We AreAt Doss, we are pioneering the future of data management, creating the "Terraform for operators". Our cutting-edge AI-driven schema layer facilitates the transformation of white-labeled data warehouses, enabling physical-goods companies to adapt their record systems at the same pace as their evolving business operations.Imagine a world where AI foundation models streamline schema migrations, provide real-time observability across operational and financial data, and manage complex version control of schema and data changes, all while allowing workflows to be composed similarly to infrastructure code.Your RoleDesign a robust EAV data model & schema-as-code platform that underpins each client instance, ensuring a harmonious balance between flexibility and transactional integrity.Develop a Git-style version control and migration engine capable of executing complex schema and data changes in live enterprise environments, rolling forward or back as needed.Create AI-assisted tools that harness foundation models to suggest, validate, and implement new customer schemas and workflow definitions.Enhance our white-labeled data warehouse (similar to BigQuery or Snowflake) to support high-volume, low-latency analytics and automation tasks.Build Terraform-like declarative APIs & SDKs that empower operations teams to treat business processes as code while upholding security, tenancy, and performance standards.Provide comprehensive observability & search across supply chain, finance, and operational data, illuminating business logic in intuitive language via AI-native search functionalities.Implement enterprise guardrails within a composable system to proactively identify anomalous behaviors or emerging risky patterns.Foster a mentoring environment that shapes engineering culture, collaborating with product and design teams to transform complex back-office challenges into elegant, resilient systems that are favored by operators.

Location: San Francisco, CAType: Full-time, on-siteOverview: As the demand for AI agents surges, we are on a rapid hiring spree to meet this challenge. At AgentMail, we are innovating in a space where the solutions are still being discovered; we focus on creating systems that empower agents as essential components of the internet. If you thrive in building products from the ground up, we want to hear from you.AgentMail is developing an API that provides dedicated inboxes for AI agents, serving as their primary identity and communication hub. This isn't just AI-enhanced email; it's email tailored for AI.We are searching for a foundational engineer with robust backend and infrastructure skills to create the essential tools that agents will utilize for communication, authentication, and real-world operations. This role is perfect for someone who enjoys working with systems: APIs, distributed architecture, reliability, and developer tools.Why Join Us?Exceptional Team: Our team comprises industry experts with backgrounds in quantitative analysis, software engineering, and private equity, featuring talent from companies like Optiver, NVIDIA, Amazon, Modern Treasury, and KKR.Rapid Growth: Our user base has doubled every two weeks since January, and we anticipate this growth to continue. With agents soon surpassing human numbers, we expect significant market changes.Unique Position: We are the exclusive identity provider for AI agents, similar to how Gmail serves human users.Key ResponsibilitiesLead and mentor a team of 4-6 engineers.Design user-friendly APIs and abstractions for humans and AI agents alike.Develop high-performance, low-latency systems with AI agents as the end-users.Engage directly with our core infrastructure, managing the processing of hundreds of thousands of emails daily.Innovate at the intersection of advanced AI capabilities and traditional email systems.Oversee projects from inception through to production deployment.Produce clean, maintainable code along with comprehensive technical documentation.Actively gather and respond to customer feedback to drive improvements and refinements.

About UsScribe is a dynamic workplace where talented individuals come together to achieve remarkable professional milestones. With over 94% of the Fortune 500 relying on Scribe to enhance their operations, our Workflow AI platform effortlessly captures and optimizes workflows, enabling teams to work smarter, faster, and with greater consistency.Since our inception in 2019, we have experienced rapid growth, amassing more than 5 million users across 600,000 businesses. Headquartered in San Francisco, we have been recognized as a LinkedIn Top Startup, valued at over $1 billion, and supported by prominent investors. Join us as we transform the way work is accomplished.Our Work CultureWe are passionate builders striving to perfect our crafts. We deeply value our colleagues and are committed to achieving success together. We adhere to the following principles:Accelerate ImpactRaise the BarEmpower Our UsersClarity is KindRapid LearningOne Team, One DreamRole OverviewWe are on the lookout for a Senior Backend Engineer to become a vital member of our Core Engineering Team, which drives some of the key functionalities at Scribe, such as document viewing and editing, content embedding and exporting, and supporting essential integrations. Millions of users depend on these workflows daily.In this position, you will take the lead on influential projects — from enhancing critical document features to developing new greenfield systems — while collaborating across the technology stack to deliver exceptional product experiences. As a backend engineer, you will deepen our systems, engage in technical discussions, and elevate the standard of engineering excellence within the team.Your ResponsibilitiesDevelop and deploy backend features within our Django monolith, covering core document workflows (viewing, editing, embeds, exports) as well as innovative greenfield projects that broaden Scribe's capabilities.Enhance performance and reliability by fine-tuning database queries, endpoints, and caching layers for critical user workflows.Collaborate with product managers, designers, and frontend engineers to create intuitive and dependable experiences at scale.Contribute to the architecture and design of our systems to improve overall efficiency and maintainability.

About KiddomKiddom is an innovative educational platform dedicated to fostering student equity and growth by integrating top-tier instructional materials with engaging digital learning experiences. With unparalleled curriculum management tools, Kiddom enables schools and districts to take charge of their curriculum, creating customized learning experiences that cater to the unique needs and aspirations of their communities. Our high-quality curriculum comes equipped with powerful insights for teachers and leaders, driving the ongoing enhancement of instructional strategies, school and district programming, and professional development.The Tooling team at Kiddom is responsible for developing and maintaining the essential systems that empower all engineering teams to produce reliable, scalable, and efficient software solutions. As a Senior Backend Engineer on this team, you will concentrate on crafting backend services, automation frameworks, and internal developer tools that enhance the speed and reliability of our entire platform.Your contributions will significantly influence how Kiddom engineers design, deploy, and monitor systems at scale, with a strong focus on clean, maintainable, and testable code, primarily in Python, with additional opportunities to work with GoLang.

At Plaid, we're reimagining the future of financial interactions. Join us in our mission to empower developers and enhance the financial lives of millions. As a Senior Backend Software Engineer, you will play a pivotal role in creating robust tools that streamline how users connect their financial accounts to various applications. Collaborate with industry leaders and contribute to a network that spans over 12,000 financial institutions across North America and Europe. You’ll be instrumental in driving innovation and excellence in our engineering practices while working alongside a talented team committed to making a real impact in the financial landscape.

About FormalAt Formal, we are redefining data security with our innovative platform that empowers teams to effortlessly manage and understand their data.We are developing a cutting-edge protocol-aware reverse-proxy for datastores and APIs, enabling organizations to gain real-time insights into their data management. This ensures that sensitive information is handled with utmost care through robust masking, filtering, and anonymization policies.Our solutions are trusted by industry leaders like Ramp, Gusto, and Notion, addressing critical needs in data security, compliance, quality management, and infrastructure access.Backed by leading venture capital firms such as Thrive Capital and Y Combinator, along with angel investors who are executives and founders from top tech companies like Datadog, Clickhouse, Plaid, and Vanta, Formal is poised for rapid growth.About the RoleWe are on a quest to assemble the most talented engineering team and are seeking individuals eager to make significant contributions towards shaping our product and advancing our mission.The ideal candidate will possess extensive experience in developing scalable backend systems, demonstrate a strong sense of ownership, and thrive in managing projects from concept to production deployment.Our current technology stack includes Golang, Rust, Temporal, various datastore protocols (Postgres, S3, Kafka, MySQL, Snowflake, Redshift, SSH), and AWS.What You'll DoDesign and implement a high-performance data platform capable of processing large data volumes in real-time.Develop new product features from initial research through implementation and ongoing maintenance.Enhance the performance and reliability of both new and existing features.Lead initiatives that you believe will significantly impact Formal's success.Architect scalable services as our organization expands and manages increased traffic.What You NeedProven experience in software development focusing on data-intensive platforms.A commitment to writing simple, high-performance code.Strong expertise in Golang with a solid understanding of its ecosystem.Experience with streaming data processing frameworks such as Apache Kafka and Google Pub/Sub.

At Vendia, we are revolutionizing the way businesses engage with AI agents. Our goal is to simplify, accelerate, and secure AI integration while ensuring governance, transparency, and control throughout the process.We are in search of a Senior Backend / Core Engineer to enhance and expand Vendia’s distributed AI data platform. You will be responsible for crucial backend systems, ensuring scalability, availability, low latency, and fault tolerance for our highly multi-tenant platform. Your role will involve designing, developing, and delivering customer-facing functionalities that enable enterprise users to manage and share extensive operational data in real time.