Senior Backend Software Engineer

Senior Backend Engineer – Transform Telecom Infrastructure for NextGenAt OXIO, we are revolutionizing the telecom landscape with the world’s first Telecom-as-a-Service (TaaS) platform. Our mission is to democratize telecom, empowering brands and enterprises to own and manage proprietary mobile networks tailored to their unique customer needs. By integrating multiple networks into a single, cloud-based platform, we provide a modern SaaS solution that offers full network access, delivering exceptional business intelligence and insights to enhance understanding of customer and machine behavior. With a relentless focus on innovation, OXIO enables companies to establish a robust telecom presence while unlocking unparalleled customer insights.As we expand our capabilities, we are looking for an experienced Tech Lead to contribute to our flagship BrandVNO platform. In this pivotal role, you will lead the development of our software development kit (SDK), empowering clients to craft groundbreaking telecom experiences within their mobile applications.

Join Brellium as a Senior Backend / Infrastructure Engineer in the vibrant heart of New York City. In this pivotal role, you will be responsible for designing, implementing, and maintaining robust backend systems that power our innovative solutions. You will collaborate with cross-functional teams to ensure seamless integration and high performance of our applications.

CVector is dedicated to revolutionizing economic optimization and AI-driven predictions across energy and manufacturing sectors.Our technology seamlessly integrates critical decision-making factors that impact cost, reliability, and profit margins, providing a unified decision layer that forecasts future scenarios, simulates potential outcomes, and optimizes operational strategies. This allows industrial plants to operate closer to their maximum economic potential daily.This position requires in-office attendance at our New York City headquarters four days a week. CVector serves clients nationwide and operates in challenging industrial environments.Role OverviewAs a Senior Software Engineer specializing in Backend and AI Infrastructure, you will be instrumental in advancing CVector’s backend platform. Your focus will be on developing time-series data systems, AI-enhanced analytics, cloud infrastructure, and data ingestion pipelines that underpin our client-facing applications and internal modeling tools.This role is ideal for engineers who thrive on working closely with data and infrastructure, possess excellent architectural judgment, and are eager to engage with AI systems, databases, and distributed backend services. You will take ownership of complex systems, lead significant technical migrations, and influence the integration of intelligence into industrial energy workflows.You will work in close collaboration with product, modeling, and frontend engineers, significantly impacting the platform's direction, reliability, and scalability for the long term.Key ResponsibilitiesAs a Senior Software Engineer, your contributions will span various interconnected domains:Intelligent SystemsTranslate customer domains and operational workflows into effective prompts and AI system interfaces.Design, implement, and refine evaluations for AI outputs.Incorporate customer feedback and reinforcement signals to enhance system performance.Optimize context selection, retrieval, and trace collection to elevate output quality.Fine-tune smaller models using collected traces to enhance speed while maintaining performance standards.Evaluate and assimilate new AI platforms and models as they emerge.Support the training and deployment of large, time-series-specific models.Backend Platform and Data InfrastructureOversee migrations and enhancements of our time-series data schemas and storage systems.Update and manage PostgreSQL and associated database infrastructure.Develop and sustain data connectors for industrial and external systems.Lead improvements to MQTT-based data ingestion pipelines.Transition PostgREST to a GraphQL-based framework and evolve our API architecture.

Overview: Spur is the AI QA Engineer for every company.Location: New York CityAt Spur, we create groundbreaking technology designed to redefine quality assurance: autonomous browser agents that think, explore, validate, and self-heal like actual users. We aren’t just another testing tool; we are revolutionizing the way digital teams deliver with confidence.The market response has been resounding. Leading brands such as Alo Yoga, Living Spaces, HelloFresh, Nextdoor, and Abercrombie & Fitch are actively engaging with us. Demand is skyrocketing, sales cycles are swift, and our product delivers — teams can go live in days, not months.Our elite team comprises builders from DeepMind, Figma, and former founders who are producing at a pace that larger companies cannot match.Our Mission: We aim to empower our customers to deliver exceptional digital experiences.Explore our Manifesto: https://www.spurtest.com/founders-letterThe RoleAs the founding engineer specializing in infrastructure and backend, you will design the core architecture of Spur’s platform—defining, building, and scaling critical infrastructure that powers our web agents.You will oversee our entire stack from top to bottom, orchestrating vast fleets of browsers and web agents in the cloud while optimizing them for massive scale. Collaborating closely with the founders, you will tackle pioneering infrastructure challenges that have a direct impact on our customers and set the benchmark across our stack, from low-level infrastructure to the user experience delivered by our agents.What You Will DoBuild and scale our core infrastructure to deploy and manage thousands of browser and web agents daily.Design, implement, and maintain our clusters, CI/CD processes, observability, and best practices.Rapidly iterate in collaboration with product, engineering, and the founders.Bonus PointsExperience with distributed task queues and optimizing performance/scalability.A history of generating impact in small teams and scaling infrastructure from the ground up.You Will Excel Here If YouHave 5+ years of experience designing, deploying, and managing infrastructure at scale.Possess deep expertise in Docker and cloud technologies.

About TitanTitan is a pioneering wealth management firm dedicated to revolutionizing the way individuals access financial advisory services. Our mission is to democratize wealth management, empowering every individual with a personal wealth advisor in their pocket. Unlike traditional wealth management, which often caters solely to the ultra-rich, Titan leverages cutting-edge technologies like artificial intelligence to create a platform that amplifies advisors' capabilities, making them accessible to a broader audience. With the support of renowned investors such as a16z, General Catalyst, and Sam Altman, we proudly manage over $1 billion in assets for clients nationwide.Why Join TitanJoining Titan means becoming part of a mission-driven company where your contributions will have a lasting impact. Ambitious Vision: Our goal of placing private wealth management in everyone's hands will redefine wealth accumulation for generations to come.Critical Timing: The rise of large language models (LLMs) fuels our quest to make personalized wealth management a reality for all, motivating our daily efforts.Significant Impact: As a part of our small, agile team, your contributions will be highly visible and influential in shaping the future of Titan.Dynamic Team Culture: We thrive on collaboration, working closely together in our office, alongside our founders who are deeply involved in daily operations.Competitive Compensation: At Titan, we offer attractive salary packages and equity opportunities that ensure every team member feels like an integral part of the company.Renowned Support: With backing from top-tier investors who align with our bold vision, including a16z and Y Combinator, we are poised for continued growth.Role OverviewWe are looking for a Principal Backend / Infrastructure Engineer to join our engineering team in New York City. In this high-impact role, you will be instrumental in architecting, developing, and scaling the core systems that underpin our financial platform. Collaborating with a talented team of former founders and engineers from tech giants like Google and Meta, you will focus on enhancing our backend services, trading systems, real-time APIs, data pipelines, and automated workflows, ensuring they are secure, scalable, and resilient. Your technical expertise will directly influence the reliability and performance of our platform as we scale beyond $1 billion in assets under management.

Join JuniorAt Junior, we are on a mission to revolutionize the investment research process for private market investors through innovative LLM-powered tools. Our esteemed clients include some of the top 10 private equity and consulting firms globally, collectively managing billions in investments annually. As a profitable and bootstrapped startup, we have a dynamic team of 24 professionals based in London and New York City.Learn more about our mission and values here. Role OverviewAs a Senior Backend Engineer, you will play a pivotal role in building and scaling the systems that drive our AI-enhanced research platform. This systems-level position is a perfect fit for engineers passionate about data flows, orchestration, and optimizing performance across complex distributed environments.Being one of our initial engineering hires, you will have the exceptional opportunity to:Deliver solutions rapidlyDesign and scale backend systems that facilitate high-throughput LLM interactions, vector searches, and multi-agent orchestration.Integrate AI infrastructure across various model providers, data stores, and internal APIs to construct cohesive and high-performing systems.Enhance reliability and observability, aiding in the evolution of our database systems (Postgres / ClickHouse) and job orchestration mechanisms.Prototype new backend functionalities (retrieval pipelines, caching layers, async task queues) to expedite our development processes.Influence our engineering culture About YouWe seek product-focused backend engineers who:Are based in NYC, as we operate 5 days a week in the office.Are enthusiastic about the fusion of AI infrastructure and systems design.Possess experience in leading projects from inception to completion.Are eager to influence product decisions.Are proficient in our technology stack: Next.js, TypeScript, PostgreSQL.Feel a constant drive to build faster.

Join Via, where we leverage technology to revolutionize global transportation. As a Senior Backend Engineer, you will play a pivotal role in our Platform team, contributing to innovative solutions that impact the daily commutes of thousands while minimizing environmental impact. Collaborate with a talented group of developers and DevOps engineers to build and maintain the cutting-edge infrastructure that powers our operations. This hybrid role requires you to be onsite in NYC 2-3 days a week, allowing for hands-on teamwork and collaboration.

Join dualentry as a Senior Backend Engineer, where you'll be at the forefront of developing cutting-edge backend solutions. In this role, you will collaborate with cross-functional teams to design, implement, and optimize robust server-side applications. Your expertise will be crucial in enhancing system performance, scalability, and security.

About KiddomKiddom is an innovative educational platform dedicated to enhancing student equity and growth. By combining high-quality instructional resources with interactive digital learning, Kiddom enables schools and districts to take control of their curriculum. This results in personalized learning experiences that cater to the distinct needs and aspirations of local communities. The platform is enriched with insightful data for teachers and leaders, fostering continuous improvement in instructional strategies, school programming, and professional development.As a member of the InfraOps team, you will play a crucial role in supporting Kiddom's engineering efforts by developing a scalable and sustainable infrastructure that aligns with our company objectives. This is a unique chance to join a small, skilled team during a pivotal moment as we transition from Series C to D funding. You will have the autonomy to influence your work significantly, embracing a variety of tasks that reflect your expertise and enthusiasm.Key Responsibilities:Promote and cultivate a robust DevOps culture at Kiddom by collaborating with teams to establish best practices and guide both new and existing services.Implement Infrastructure as Code (IaC) to ensure confidence in automated, repeatable processes.

About the Role:Parker is dedicated to a bold mission: empowering individuals to achieve financial independence. We believe that by providing independent business owners with essential financial tools, we can help them scale their operations profitably.Our flagship product merges a virtual corporate card with financial software designed for profitability, enabling eCommerce merchants to accelerate growth while effectively managing their margins.To date, we have successfully raised over $180M from top-tier investors, including Valar Ventures, Y Combinator, SVB, and industry pioneers such as Solomon Hykes (Docker), Paul Buchheit (Gmail), Paul Graham (Y Combinator), and Robert Leshner (Compound).As a dynamic Series B fintech, we are rapidly expanding, boasting a robust product-market fit, a burgeoning customer base, and a team driven by technical excellence and impactful solutions.We are seeking a Senior Software Engineer – Backend to architect, develop, and scale the critical systems that underpin Parker’s financial platform. In this pivotal leadership role, you will influence backend architecture, data infrastructure, and engineering best practices during our growth phase.You will work collaboratively with Product, Infrastructure, and Data teams to deliver high-performance, reliable systems that handle billions in transactions and empower thousands of merchants. This high-impact position is ideal for engineers who thrive on ownership, relish the challenge of complex systems, and prioritize elegant, maintainable solutions.What You’ll Do:Design and scale backend services that drive Parker’s financial products and APIs.Lead architectural strategies to guarantee performance, reliability, and scalability across our systems.Develop and maintain services in a modern cloud-native environment (Node.js, PostgreSQL, Docker, Kubernetes, AWS).Collaborate with product and infrastructure teams to create secure, user-friendly APIs and data models.Promote engineering excellence through code reviews, mentorship, and architectural guidance.Identify performance issues and spearhead initiatives to enhance reliability, observability, and system design.Contribute to the advancement of Parker’s technical roadmap and long-term engineering vision.

About Pangram LabsAt Pangram Labs, we are dedicated to ensuring authenticity through the development of cutting-edge AI detection systems. Our team is at the forefront of research, creating algorithms and products that integrate our advanced technology into everyday life.We seek individuals who are proactive, mission-focused, and passionate about innovation to join our in-person team based in Brooklyn, New York.About the RoleWe are on the lookout for a Senior Software Engineer with a backend emphasis to design, implement, and scale our production systems, which support our core technology for a rapidly expanding user base.In this senior-level position, you will be responsible for the backend infrastructure that drives Pangram's AI detection platform. You will have the autonomy to make architectural decisions, tackle complex scaling challenges, and ensure that our systems remain reliable and efficient as user demand increases. Collaborating closely with our frontend and machine learning teams, you will work primarily with our Django backend and AWS infrastructure.What You'll DoDesign and develop scalable backend services and APIs to deliver AI detection features effectively.Ensure the reliability, performance, and observability of our production systems.Architect and manage data pipelines, caching layers, and service infrastructure using AWS.Collaborate with machine learning engineers to deploy and manage machine learning models in production.Identify and resolve performance bottlenecks as user traffic and system complexity increase.Establish and enhance engineering best practices related to testing, deployment, and incident management.

OverviewJoin our dynamic team as a Senior Backend Engineer where you will architect, develop, and scale essential backend systems that support high-traffic consumer applications and internal platforms. You will take ownership of vital services and APIs, engage with high-throughput distributed architectures, and collaborate closely with product, machine learning, and engineering teams to deliver seamless, low-latency experiences for our users.About PhiaPhia has successfully secured $43M in funding from top-tier investors including Notable Capital, Khosla Ventures, and Kleiner Perkins to develop the AI alignment layer for the commerce sector. In less than a year, Phia’s consumer shopping assistant has amassed over one million users and established partnerships with over 6,200 retail brands, generating billions in annual gross merchandise volume. Each month, Phia contributes millions in sales for its partners and has achieved an impressive 11× revenue growth since its inception.As AI-driven vertical agents revolutionize various industries, Phia is at the forefront of transforming commerce from a fragmented and impersonal experience into a more intelligent, trustworthy, and user-centric journey. This trust serves as our competitive edge, positioning us as the comprehensive shopping destination for the next generation of consumers.Phia fosters a lean, high-ownership culture with a startup mentality. If you are eager to work in a fast-paced environment and tackle complex challenges within consumer AI and commerce, we invite you to join us.

About FLORAAt FLORA, we empower the new creative class with innovative tools that enhance their craft. Our intelligent platform utilizes cutting-edge AI models to facilitate creativity. With a small but dynamic team of approximately 20, we have successfully raised $52 million from notable investors such as Redpoint Ventures, Hanabi Capital, Menlo Ventures, Justin Kan, and Gabe Whaley (founder of MSCHF). Our clientele includes esteemed names in the creative industries, such as Pentagram, Lionsgate, and Nike.About the RoleWe are seeking a Senior Backend Engineer to be a pivotal part of FLORA's platform development. You will engage with our database layer, generation infrastructure, observability tools, and the services that enable a seamless real-time creative experience on a large scale.As part of our skilled team of full-stack engineers, you will leverage your extensive backend expertise to resolve our most challenging systems issues. You will take charge of complex projects, work closely with engineering leadership on architectural choices, and evolve with our backend team as we expand.Your ResponsibilitiesDesign and implement generation orchestration infrastructure capable of supporting significant scale.Enhance observability across our infrastructure to minimize failure rates and proactively identify issues before they affect users.Optimize our database layer through effective schema design, indexing strategies, and migrations as we grow.Collaborate on architectural decisions to facilitate the introduction of new features.Partner with the CTO, Product Engineering, and Intelligence Engineering teams to ensure a stable and high-performing foundation for features across all client platforms.Desired Qualifications:A minimum of 5 years of experience in building robust backend systems and operating services at scale.At least 3 years of in-depth experience with TypeScript, emphasizing type safety, error handling, and code organization.Demonstrated ability to analyze ambiguous problems and deliver well-structured solutions.Experience with queue-based architectures, including job scheduling, orchestration, and fault tolerance.Strong instincts for observability; experience in system instrumentation, dashboard creation, and utilizing data to enhance reliability.Excellent communication skills and a collaborative approach to technical decision-making.

At Bubble, our mission is clear: we aim to empower everyone to create software. We believe that anyone with a transformative idea should have the means to bring it to life. Our AI-driven visual development platform allows individuals, from first-time entrepreneurs to established enterprise teams, to transform ideas into fully functional, scalable applications across web, iOS, and Android—all without the need for coding or managing complex workflows.As the sole full-stack, cross-device no-code platform, Bubble has garnered over 5 million users across more than 100 countries, breaking down barriers to entrepreneurship and innovation worldwide.Our Achievements:Our platform is thriving, with entire VC-backed companies being built solely using Bubble. After successfully finding product-market fit and eight years of bootstrapping, we secured a $100 million Series A funding round, establishing ourselves as one of the fastest-growing companies within the New York tech ecosystem. The potential of Bubble is demonstrated by our community—individuals are not just launching products; they are creating viable businesses. For instance, Mailead turned a $10k investment in a Bubble product into a $2M valuation, while Faceless.video achieved over $1M in annual recurring revenue within a year.About the Platform Team:Our Platform team is dedicated to enhancing our scaling, reliability, and enablement capabilities as we aim to double our customer base in the coming years. Our responsibilities encompass both scalable infrastructure and our core backend systems. Success in this role means delivering timely capacity, executing workloads rapidly, and guaranteeing data scalability across diverse applications while managing costs and addressing implementation and infrastructure inefficiencies.About the Role:Join a small, elite team tackling challenges faced by the largest cloud providers. This position is an opportunity to be at the forefront of a platform that is revolutionizing the traditional engineering stack globally. Additionally, you will contribute to fostering an inclusive, effective, and collaborative engineering culture. This role requires after-hours and on-call availability.

Why We Need YouIn the past year, GovEagle has rapidly established itself as the preferred vendor among the leading government contractors across the nation. Our platform has seen a staggering 10x increase in usage, with our AI agents streamlining the process of shredding requirements, constructing compliance matrices, and drafting proposals in mere hours instead of weeks.To sustain this growth trajectory, we are in search of a Senior Backend Engineer to enhance and optimize the essential systems that power our platform. Your responsibilities will encompass the entirety of our backend, from optimizing API performance to enhancing AI pipeline efficiency and infrastructure. You will ensure that our systems remain fast, reliable, and scalable, as some of the largest defense contractors in the world depend on GovEagle daily.What You're Signing Up ForProfiling and optimizing critical paths within our backend to maintain swift API response times and efficient AI pipelines as workload complexity and customer volume grow exponentially.Identifying and resolving bottlenecks in our database layer, background job orchestration, and asynchronous processing, particularly for extensive LLM workloads.Enhancing our existing Grafana stack to augment logging, metrics, tracing, and alerting, enabling us to comprehend system behavior in production and preemptively address issues before they affect customers.Designing infrastructure improvements to accommodate increased workloads, more concurrent users, and increasingly complex AI pipelines without compromising latency or reliability.Streamlining our build, test, and deployment pipelines to empower the team to deliver faster and with greater confidence.Overseeing our on-call processes, SLOs, and incident response playbooks to make production maintenance uneventful.Collaborating with the CTO as a thought partner on backend architecture decisions. Evaluating trade-offs, drafting RFCs, and raising the engineering standards across the team.

About UsAt Adaptive, we are a pioneering vertical AI company with a passionate team of 40 dedicated professionals, creating an AI-native ERP solution tailored for the real estate and construction industries. Our rapid growth has attracted over 600 clients and significant funding of $26 million from prestigious investors such as Emergence, a16z, and a host of angel investors from renowned firms including Brex, Ramp, Airbase, Square, and Shopify.Why You Should Be Part of UsEmpowering Local CommunitiesJoin us in serving the small businesses that are the backbone of our communities. The local coffee shop, the new residences sprouting up, and the ADUs addressing housing shortages are all projects driven by our clients—individuals who are deeply rooted in their neighborhoods and passionate about their work. These skilled artisans and builders are the creators of spaces that foster connection and memories.Collaborate with a World-Class Team in Vertical AIOur culture is steeped in collaboration, excellence, and shared experience. With a strong foundation in finance, technology, and construction, we are positioned to lead in a booming market. With your talents, we can continue to innovate and expand our impact.Your RoleWe are thrilled to invite a Senior Backend Software Engineer to join our dynamic team at Adaptive! Your expertise will play a crucial role in shaping our engineering initiatives and ensuring the delivery of high-caliber software solutions.Reporting to the VP of Engineering, you will collaborate closely with a dedicated engineering and product team of 15, significantly contributing to the architectural design, development, and optimization of our innovative products.Key ResponsibilitiesLead the execution and successful delivery of backend and infrastructure-focused projects in collaboration with the product and design teams.Ensure that backend systems are secure, scalable, resilient, and optimized for performance as we expand.Align technical solutions with business objectives and product vision.Facilitate technical discussions and decision-making processes to ensure alignment with overall company strategies.Demonstrate best practices by writing high-quality, maintainable, and robust code.

About the Senior Backend Software Engineer Role Sigma Computing builds a high-performance platform designed for modern data needs. The engineering team is growing in New York City, NY, and looking for experienced backend engineers who enjoy solving complex problems and improving how users interact with data. This group values practical solutions that make data more accessible for everyone. What You Will Do Tackle technical challenges that come with delivering an interactive data warehouse for exploration and analysis. Work with languages and tools including Rust, Go, GraphQL, Node, and Kubernetes to build and maintain reliable systems. Develop distributed backend services, algorithms, and APIs to support Sigma's cloud applications. Investigate and resolve product or system issues, using strong analytical and debugging skills. Design and implement new software features that support a rapidly expanding user base. Participate in design and code reviews with peers and stakeholders to maintain high technical standards.

About SandbarAt Sandbar, located in the vibrant heart of New York City, we are dedicated to enhancing human capability in an increasingly agentic world. Our innovative team has developed cutting-edge software, machine learning, and hardware products, collaborating with industry leaders including Meta, CTRL-labs, Google, Apple, Fitbit, Peloton, and Equinox.Our flagship product, Stream, represents the future of human-agent interaction—a sophisticated private voice ring and conversational computer that has garnered attention from WSJ, Bloomberg, and Wired, with shipping set to commence in Summer '26.We invite you to join us in pioneering a transformative interface for self-augmentation.Your RoleWe are on the lookout for a talented and experienced infrastructure engineer to play a critical role in the development of Stream. You will be instrumental in creating a highly scalable, real-time production service that incorporates multiple stages of machine learning and data processing. Collaboration with mobile and firmware engineers will be essential as you lay the groundwork for groundbreaking human-computer interactions.

Noise Labs is building tools that blend diverse online data and market insights to help users navigate uncertain times. Based in SoHo, New York City, the team is small (10 people), collaborative, and values thoughtful design and high-quality engineering. Remote work is possible. What You’ll Do Develop backend systems that power consumer features such as feeds, ranking algorithms, notifications, real-time interactions, and social elements. Build and maintain a codebase that supports both developer and automated agent confidence. Own core product services, data flows, and APIs. Design infrastructure where speed and accuracy matter, especially for settlement, pricing, and real-time financial transactions. Improve the development environment, including CI, testing, and observability. Requirements Skilled in using AI tools to speed up development. Strong judgment for balancing latency and accuracy in financial systems. Deep experience with TypeScript, relational databases, real-time communications, and event-driven data flows in finance. Comfortable working in a strict monorepo setup with clear service boundaries and conventions. Ability to independently debug and improve the development pipeline. Clear communicator for async updates, incident reviews, and team problem-solving. Bonus Points Experience with Effect-TS. Side projects, open source work, or previous startup experience. Compensation and Benefits The minimum full-time salary ranges from $160,000 to $210,000, in compliance with New York City's Pay Transparency Law. Full-time employees at Noise Labs are also eligible for additional compensation, including equity and benefits, based on the specific role.