Senior Backend / Infrastructure Engineer

About Kalepa:Kalepa is revolutionizing the commercial insurance industry, transforming it from outdated practices to innovative solutions.Our AI Underwriting Platform empowers insurers to centralize submission data, uncover critical risk insights, and make faster, more informed decisions. Clients have experienced significant enhancements in both operational speed and portfolio quality, often referring to our platform as a 'truly an underwriter’s dream.'With backing from esteemed investors like IA Ventures and Inspired Capital, our talented team boasts experience from leading tech giants including Facebook, Google, Amazon, Mastercard, and Uber.Our Values:At Kalepa, our core values are not just words on paper; they are the foundation of our culture and the key to unlocking the potential of our employees.Hustle and Determination: We seek individuals who take complete ownership of their work and strive for excellence with relentless determination.Deliver Customer Impact: Our focus is on customer outcomes. Every feature and decision is evaluated on whether it enhances the decision-making process for insurers.Meritocracy: We reward excellence and foster rapid growth for those who excel in their roles.Transparency: We prioritize honest communication and constructive feedback, fostering an environment where ideas can be freely exchanged.Ownership: We encourage our team members to take initiative and lead projects with accountability.

About Kalepa:Commercial insurance is a trillion-dollar industry still largely managed through outdated tools. Kalepa is revolutionizing this landscape.As an AI Underwriting Platform, Kalepa empowers the world's most significant insurers by centralizing and prioritizing submission data, unveiling critical risk insights, and enabling faster, more confident decision-making. Our clients experience immediate enhancements in both speed and portfolio quality upon implementation of Kalepa - so much so that they refer to it as “truly an underwriter’s dream.”Supported by esteemed investors including IA Ventures and Inspired Capital, our team comprises former specialists from industry giants like Facebook, Google, Amazon, Mastercard, and Uber.Our Values:At Kalepa, we believe in values that genuinely propel our team forward. Our success is driven by five core principles:Hustle and Determination - We attract individuals who take ownership of their work and consistently pursue excellence with vigor. Tackling challenging problems is our standard; we don't back down.Deliver Customer Impact - Our focus is entirely on the customer. Every feature, every line of code, and every decision is evaluated based on one question: does this enhance decision-making for insurers? If it doesn't contribute to speed, accuracy, or profitability for our clients, we don't pursue it.Meritocracy - We are crafting something extraordinary and that demands exceptional talent and ideas. We maintain high standards and reward excellence with rapid growth opportunities.Transparency - Honest communication is paramount. We prioritize constructive dialogue and challenge ideas rather than individuals.

At Highlight, we're creating a revolutionary shared intelligence layer tailored for today’s dynamic workforce. Our platform integrates context across all team members and tools, effectively dismantling information barriers. It adapts to your organization, intelligently routing knowledge and consistently automating workflows.About the PositionWe are in search of a Senior Backend Software Engineer to be responsible for essential backend infrastructure, including systems for team management, permissions, and integration-driven workflows. Your primary focus will be to enhance and scale our systems with a strong emphasis on performance, reliability, and an exceptional user experience.This role is perfect for an individual passionate about the convergence of desktop software, native development, and AI integration, and who thrives in a collaborative, fast-paced environment.Please note: This position requires on-site presence at our New York City office five days a week.Key ResponsibilitiesDevelop backend systems that facilitate product expansion, including multi-tenant architectures, permissions, and internal/admin tools.Design and manage asynchronous processing systems for background tasks and workflow orchestration.Optimize system performance and cost through practical techniques such as caching, batching, and efficient data access patterns.Create secure and extensible integration frameworks, including authentication mechanisms, APIs, and third-party connectors.Enhance backend engineering standards through observability, rigorous testing, incident preparedness, and operational best practices.Collaborate across departments to deliver features from inception to deployment while designing durable, extendable, and easily adjustable backend systems.Candidate ProfileWe are looking for someone eager to shape the AI-driven user experience of the future. We value extreme ownership, accountability, and initiative.This role is ideal for individuals who enjoy building scalable systems and enhancing observability while minimizing costs through practical optimizations such as caching, batching, and queue-based processing. You will work closely with product and machine learning teams to ensure Highlight remains reliable and high-performing as we scale.

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.

At CLEAR, we are pioneering the future of secure identity management. Our mission is to enhance safety and convenience—both physically and digitally. With over 38 million members and a rapidly expanding global network of partners, CLEAR's secure identity platform is revolutionizing how people navigate their lives, work, and travel. From airports to stadiums and everyday experiences, we enable seamless, frictionless interactions.As a Senior Backend Software Engineer within our CLEAR1 team, you will work at the convergence of cutting-edge web technologies, healthcare interoperability standards, and robust identity systems. Your contributions will facilitate frictionless and trusted healthcare experiences across the nation, connecting patients, providers, and partners.

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.

Join Flex, a dynamic and innovative FinTech company based in NYC, as a Senior Backend Software Engineer. In this pivotal role, you will be instrumental in architecting, developing, and scaling backend services and APIs that empower our groundbreaking rent payment platform. Collaborate with cross-functional teams to deliver resilient and efficient systems that enhance the renting experience for users and partners alike. You will oversee every aspect of the service lifecycle, from initial requirements gathering and system architecture to implementation, testing, deployment, and ongoing monitoring. Additionally, you will have the opportunity to mentor junior engineers and promote technical best practices within the team, fostering a culture of excellence and collaboration.

Senior Staff Backend EngineerLocation: Manhattan, New YorkOnsite | Full-timeJoin our dynamic team at mlabs, the innovative engine behind one of the most visited platforms in the digital asset industry. With a staggering ~$1B in daily volume, our cutting-edge technology stack is designed to manage low-latency, high-throughput, and consistent load at an unprecedented scale.The RoleAs a Senior Staff Backend Engineer, you will be a pivotal technical leader, ensuring the robustness and continuous advancement of our core backend systems. Your role involves a combination of high-level architectural oversight and hands-on execution, focusing on mitigating scaling challenges and designing resilient, fault-tolerant systems that can handle substantial workloads.What You’ll Do:Own & Execute: Take charge of writing and deploying production code for core services, leading the design and implementation of high-scale distributed systems.Architect for Scale: Make informed decisions that harmonize swift iteration with long-term system scalability and maintainability.Drive Initiatives: Spearhead projects that involve multiple services, including storage, compute, APIs, and blockchain infrastructure.Set the Standard: Create benchmarks for observability, reliability, and performance, while enhancing engineering quality through design reviews and RFCs.Technical Leadership: Serve as a technical anchor during critical incidents and mentor peers, sharing your depth of knowledge and clarity of thought.Optimize Velocity: Enhance the internal developer experience by refining tools, CI/CD pipelines, and service abstractions.

Match Group, Inc. is hiring a Senior Backend Engineering Manager to lead the Recommendations team in New York. This position guides a skilled group of engineers focused on building and improving recommendation algorithms and systems that support user experience across multiple platforms. Role overview The Senior Backend Engineering Manager takes responsibility for technical direction and team leadership. The work centers on backend technologies, with a strong emphasis on advancing recommendation systems that directly impact how users interact with Match Group’s products. What you will do Oversee and mentor backend engineers on the Recommendations team Drive the design and implementation of recommendation algorithms and supporting systems Focus on delivering solutions that improve user experience across Match Group platforms Requirements Experience leading backend engineering teams Background in developing recommendation systems or similar backend technologies Strong problem-solving skills and the ability to turn complex challenges into practical solutions

About Us:Ether.fi stands as one of the leading cryptocurrency companies globally, managing over $10 billion in assets with a predominantly technical team of 30 members. We have achieved profitability from day one and are dedicated to developing impactful consumer applications.Our vision encompasses the evolution of genuine on-chain banking. Our innovative products—Stake, Liquid, and Cash—empower users to earn yield through diverse DeFi strategies while facilitating real-world spending via our credit cards. Public analytics for Cash and Stake are available for review.Position Overview:We are in search of a senior backend software engineer to take charge of our core backend architecture, transaction processing, and ensuring high availability. You will be part of a pivotal engineering team committed to delivering distributed, scalable, and resilient backend systems. This includes card transaction processing, low-latency APIs, microservice architectures, and on-chain data indexing—essentially, everything a neobank would aspire to build is on our roadmap.Responsibilities:Take ownership of critical components within our backend systems, enhancing functionality to boost throughput and reduce latency.Design, develop, and optimize scalable transaction processing services to facilitate high-throughput, low-latency financial transactions.Address challenges related to user friction during card transaction declines.Enhance our Cloud Infrastructure, CI/CD pipelines, automation, observability, and monitoring systems.Qualifications:Solid foundation in software engineering principles and problem-solving abilities.Proven experience in shipping remarkable products that serve thousands of real users.A minimum of 5 years of professional coding experience.A strong drive and a commitment to excellence; we are a highly ambitious team with bold goals, and we strive diligently to achieve them.Experience in web3 technologies is a plus.Perks and Benefits:Competitive salary and performance-based incentives.

About Tru Identity Tru Identity is dedicated to revolutionizing the importation process of goods into the United States, aiming to simplify trade compliance within an industry valued at $4 trillion annually. Our innovative platform empowers companies worldwide to ensure compliance even before their shipments leave the port of origin, facilitating timely deliveries, maintaining sales momentum, and supporting international expansion. We assist importers, marketplaces, and logistics providers in automating the intricate regulatory compliance tasks that can hinder trade, ultimately saving time and resources while minimizing fraud and frustration. Although we are still in our early stages, our rapid growth is evidenced by the commercial and government clients we have already secured. By joining us at this pivotal moment, you will play a crucial role in our foundational team, enjoying significant ownership, the ability to influence product development, and the opportunity to contribute to a transformative venture from its inception. We thrive on agility, focus, and a culture that values perseverance and creative problem-solving.

Join our innovative Data Solutions team, where we're developing the core intelligence platform relied upon by prominent public and private sector organizations to investigate threats, monitor risks in real-time, and extract valuable insights from blockchain and related data on a large scale. We prioritize agility and efficiency, seeking engineers who are eager to take ownership, thrive in a fast-paced environment, and are motivated by the mission requirements of our clients to deliver significant real-world impact.In this position, you will:Design and spearhead the development of new platform features that support critical investigations and monitoring processes.Manage services that handle the ingestion, transformation, and delivery of hundreds of terabytes of data, ensuring service-level objectives (SLOs) for latency, freshness, and availability are met.Enhance the scalability, performance, and cost-effectiveness of our data plane and APIs.Elevate quality standards across reliability, security, and compliance for both cloud and on-premises setups.Mentor engineers across various teams and influence the technical strategy beyond your immediate group.Own and improve backend services that drive customer-facing APIs, usage and billing systems, alerting, and data observability.Lead both team and cross-team initiatives from start to finish: discovery, architecture, implementation, rollout, and post-launch analysis.Design event-driven and streaming workflows (e.g., Kafka) with robust data contracts and schema evolution.Promote operational excellence through SLOs, runbooks, on-call duties, incident reviews, and capacity planning for high-query-per-second systems.Collaborate with product, data engineering/science, and security teams to translate customer needs into sustainable systems.We seek candidates who possess:Extensive backend engineering experience in building cloud-hosted services and data pipelines, preferably on AWS or GCP (experience with both is a plus).Strong expertise in APIs, streaming systems, and distributed systems (e.g., microservices on Kubernetes).Proven track record of managing systems at scale (hundreds to thousands of requests per second; terabyte to petabyte data volumes).High level of judgment regarding reliability, security, and cost management, demonstrating measurable improvements.Capability to lead through influence—mentoring, conducting design reviews, and collaborating across teams.

iCapital Network is hiring a Senior Backend Engineer at the Senior Vice President level in New York, NY. This position plays a key role in shaping the technology stack and contributes directly to the company’s mission of improving financial services for clients. Role overview This is a leadership role with a focus on backend engineering. The Senior Backend Engineer will influence the technical direction of the team and help guide architectural decisions for backend systems. What you will do Lead the design and development of scalable backend systems Collaborate with cross-functional teams to deliver solutions that enhance client experiences Guide technical decisions and help set the direction for backend architecture Location This role is based in New York, New York, United States.

Join our client's innovative team at bloomforthcorp, where we are revolutionizing project management through advanced artificial intelligence software. As a Senior Backend Software Engineer, you will have the opportunity to contribute to a dynamic and diverse team that is dedicated to creating high-quality, impactful products at scale. This is a unique chance to join an early-stage, high-performing team committed to a mission that aims to transform how teams across the globe tackle challenges with AI-enhanced management.In this role, you will lead the backend development efforts, crafting exciting new features and complex interfaces while making critical technical decisions that influence the product's direction. Your expertise in Ruby on Rails will be pivotal in driving our backend team’s success.Our Technology Stack includes: Rails, Typescript, and React.

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.

Clear Street develops technology that opens access to a wide range of assets for sophisticated investors in global markets. The company’s cloud-native platform is built for speed and transparency, supporting both institutional and modern investment needs. Clients use tools and services previously available only to major institutions, now adapted for today’s markets. The team combines experienced engineers and finance professionals to create essential solutions for the financial sector. Engineers at Clear Street work on platforms that serve institutional clients and drive technical progress in finance. The team values collaboration, creativity, and a strong work ethic, supporting growth with modern technologies that have a direct impact on the industry. Role overview The Senior Backend Software Engineer role centers on building backend systems for financial applications, with a focus on digital assets. This position involves designing, developing, and supporting scalable backend services for trading platforms, payment systems, and digital asset infrastructure. The work blends traditional finance with decentralized technologies and calls for rigorous engineering in a rapidly changing environment. Key responsibilities Design and implement backend services and APIs for financial applications. Build and maintain systems for trading, settlement, and asset custody, covering both fiat and cryptocurrency. Integrate with blockchain networks such as Ethereum and Bitcoin, along with third-party financial APIs. Ensure systems are reliable, secure, and scalable for high-throughput operations. Develop and maintain data pipelines to support efficient information flow. More information about Clear Street is available at https://clearstreet.io.

Polymarket is a leading prediction market platform where users trade on the outcomes of real-world events. The platform covers a wide range of topics, from politics and economics to sports and culture. By removing centralized control, Polymarket aggregates opinions into transparent, market-based probabilities that reflect collective expectations. With rapid growth underway and a target of $21B in trades by 2025, the company aims to become a trusted source of truth in global media. The team is expanding to support this mission. Role overview The Senior Backend Engineer, Onchain, joins the Onchain Execution team. This group builds and maintains the systems that connect Polymarket products to the blockchain. The work includes relayers, transaction pipelines, RPC infrastructure, and settlement logic for every trade. The role involves solving technical problems at the intersection of distributed systems, blockchain protocols, and backend engineering at scale. What you will do Develop and maintain onchain execution infrastructure: Design and manage relayer systems, transaction pipelines, and settlement logic that support Polymarket's markets. Architect high-performance backend systems: Build scalable APIs and services to handle high transaction volumes and real-time data with low latency. Manage RPC and chain connectivity: Implement and optimize endpoints and integrations to keep Polymarket reliably connected to EVM networks. Enhance performance and reliability: Improve throughput and efficiency for onchain systems as transaction volumes grow. Strengthen security and fault tolerance: Apply best practices for secure, highly available distributed systems in onchain environments. Elevate code quality: Participate in code reviews and help maintain high engineering standards across the team. Requirements Extensive experience in backend software engineering, including clean code, strong database skills, and well-designed APIs. Deep understanding of EVM networks and blockchain protocols. Background in building or maintaining relayer systems, scalable RPC infrastructure, or contributing to core blockchain node software. This position is based in New York.

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.