Sr Backend Engineer
NxT Level
Senior Backend EngineerOur client is building AI technology to make healthcare accessible and free for everyone. They are seeking Sr Backend engineers to develop scalable infrastructure that supports billions of AI driven consultations while ensuring medical safety and HIPAA compliance.This role is central to delivering reliable and secure systems at massive scale.What You Will BuildHealthcare API InfrastructureDesign and maintain high performance APIs using Python and cloud services to handle millions of requests each monthDevelop RESTful APIs that support AI healthcare tools and internal platform workflowsProcess sensitive patient data in real time while maintaining strict HIPAA complianceCoordinate internal APIs to support web platforms and AI decision makingIntegration and Data SystemsImplement secure health record exchange with EHR systems, national health networks, and QHINsIntegrate with telehealth providers, analytics platforms, and third-party healthcare APIsProcess large volumes of sensitive data with encryption and compliance safeguardsBuild partner API integrations across multiple diverse healthcare systemsScale and ReliabilityOptimize databases for high-volume, complex healthcare queriesImplement secure caching and session management using RedisDevelop error handling, failover, and disaster recovery systems for mission critical servicesEnhance performance and reliability to support rapid user growthAI System IntegrationCoordinate backend workflows for AI tools and clinical decision makingDevelop Python-based deterministic systems alongside AI agents to ensure clinical accuracyBuild APIs supporting model inference, data preprocessing, and result handlingImplement validation layers and human escalation protocols for AI safetyThis role also includes work on healthcare compliance automation, advanced system monitoring, multi-region deployment, and foundational backend infrastructure for future AI healthcare capabilities.How The Client OperatesEngineering led environment with minimal process overheadFlat structure with direct collaboration with company leadershipEnd to end ownership from concept to productionAI assisted development tools encouragedFast moving team with strong judgment and accountabilityWhat The Client Is Looking ForBackgroundComputer science degree or equivalent hands on experienceEngineering, math, or related technical degrees welcomedTrack record of operating at a high engineering standardFounder level ownership mindset or early stage startup experience preferredAbility to work independently while collaborating across teamsTechnical ExperienceSix or more years of backend engineering experienceStrong experience with Python and frameworks such as FastAPI or FlaskCloud services experience and high volume API handlingProficiency with relational databases and performance optimizationExperience with Redis, caching strategies, and distributed systems designSystem Design and IntegrationThird-party API integration and webhook managementMicroservices architecture and distributed system patternsSecurity best practices for sensitive data and API designCI/CD pipelines, containerization, and deployment automationMonitoring, logging, and observability toolsNice To HaveExperience in healthcare, fintech, or other regulated industriesKnowledge of healthcare data standards such as HL7, FHIR, and HIPAA complianceExperience with high-scale real time data processingFamiliarity with AI and ML system integration and model servingEvent-driven architectures, message queues, and async processingExposure to healthcare workflows, EHR systems, or telehealth platformsSeed or Series A startup experienceAdvanced degree in CS, engineering, or related fieldWhat The Client OffersCompetitive compensation and meaningful equityOpportunity to build infrastructure impacting millions of patients globallyDirect collaboration with company leadership and healthcare expertsAccess to modern backend and AI technologiesBenefits reimbursement
- ...to pursue a world-changing mission. They are building a diverse team of dynamic engineers creating high quality, high impact products at scale and we’re looking for a senior backend engineer with experience of Ruby on Rails to provide leadership to our growing backend...SeniorFull time
$167k - $219k
...content indexed, the services that query it, and the systems that serve it with high relevance and low latency. We're looking for a Backend Engineer who can own this end-to-end: from data ingestion and Elasticsearch index design through the retrieval/query services that...SeniorWork at office2 days per week- ...Senior Software EngineerYou'll join Slang's Engineering team as a Senior Software Engineer, contributing across our core product areas... ...conversation. You'll spend roughly 90% of your time developing backend services. Our backend is written in Kotlin, but prior Kotlin experience...SeniorHourly payRemote workShift work
$160k - $190k
...Description JOB TITLE: Sr. Backend Engineer LOCATION: Jersey City (Hybrid, 3 days/ week) REPORTS TO: Squad Leader The Company: Sunbit builds financial technology for real life. Our AI-native platform helps more people get to "yes" at the moments that...Senior3 days per week$185k - $215k
...What your experience will be You'll join Slang's Engineering team as a Senior Software Engineer, contributing across our core product... .... You'll spend roughly 90% of your time developing backend services. Our backend is written in Kotlin, but prior Kotlin experience...SeniorHourly payLocal areaRemote workShift work$126k - $197k
...City, Salt Lake City, London, Edinburgh, Pune, Dubai, Geneva and São Paulo. The Role We are seeking an experienced backend software engineer to join the Platform Integrations team! We are looking for a senior engineer to join us in building client onboarding...SeniorFull timeH1bRemote workWorldwideVisa sponsorshipWork visa$140k - $215k
...and each other. Ready to join a mission that matters? The future of cybersecurity starts with you.About the Role:As our new Senior Engineer - Cloud, you’ll be part of the GDI (Getting Data In) group under NG-SIEM with a focus on data ingestion at petabyte-scale. The...SeniorFull timeWork experience placementWork at officeLocal area- ...banks and payment products were reinvented today, they would look like Fin. About the role We are looking for a Senior Backend Engineer to own the core systems that make this work. You will design and build the services that move real money, integrate with...SeniorFull timeWorldwide
- ...powered by fast, reliable, and deeply technical market infrastructure.About the rolePolymarket is looking for a senior/staff backend engineer to own the systems that connect our exchange to the outside world — market data distribution, order routing, and the high-throughput...Senior
- ...days in-office culture. Both founders are technical. Every engineer on the team has experience at early-stage startups. Several have... ...customers, make technical decisions, and ship. Role: Senior Backend Software Engineer We're a tiny engineering team building...SeniorFull timeWork at office
$165 per hour
...DescriptionIf you say you have an idea and can covert that into a something beautiful, then you are the one we are looking for.As our Sr. Backend Engineer, you will be:You will develop efficient web services and APIsYou will participate in daily code deploys while working on...Senior- ...we need your help adding fuel to the fire.About the RolePolymarket is launching perpetual futures and we're looking for Senior Backend Engineers to own the core systems that make it run. This is backend exchange engineering in the truest sense: low-latency order matching...Senior
$150k - $300k
$150,000-$300,000 per annum New York, United States Permanent Senior Backend Engineer - New York My client is a well funded early stage startup building a high scale social platform from the ground up. They are focused on building persistent, high performance...SeniorPermanent employment- ...media, powered by fast, reliable, and deeply technical market infrastructure.About the rolePolymarket is looking for a senior backend engineer to build and scale the payments infrastructure that powers deposits, withdrawals, and money movement across the platform.This...Senior
- ...As a Senior Backend Software Engineer on our Diagnostics team, you'll build the part of Regard that reads a patient's medical chart — labs, medications, vitals, procedures, prior notes, history — and determines which conditions are present, along with the evidence supporting...SeniorFull timeWork at officeLocal areaHome officeVisa sponsorshipRelocation package2 days per week
$182.75k - $278.5k
...help change mental healthcare for the better. The Work Backend at Headway involves high-stakes logic. You’re building a reliable... ...that give providers their time back. The Insurance Billing Engine: We apply AI pragmatically ( blog ) to reduce administrative...SeniorFull timeFlexible hoursShift work- ...global media, powered by fast, reliable, and deeply technical market infrastructure.About The RolePolymarket is looking for a backend engineer to build the systems that power how markets are created, managed, and resolved at scale. This role is focused on automation pipelines...Senior
- ...global media, powered by fast, reliable, and deeply technical market infrastructure.About the rolePolymarket is looking for a backend/product engineer to own the core domain APIs and data models that power our consumer-facing product.You’ll work at the intersection of...Senior
- ...Join SignalFire’s Talent Network for Founding Back-end Software Engineer Roles at VC-Backed Startups This is not an application for a... ...enterprise SaaS. We’re looking to connect with exceptional Founding Backend Engineers who are excited about building scalable, high-...SeniorFull time
$185k - $225k
...role:Salary range: $185k - $225k USD*We are looking for smart engineers who love to code, seek challenging problems, and appreciate recognition... ...full-stack, data, ML, and DevOps engineers to build scalable backend solutions as we continue to grow. We're a small team where...SeniorWork at officeRemote work- ...beacon of truth in global media and we need your help adding fuel to the fire.About the RolePolymarket is looking for a Senior Backend Engineer to join our DeFi Trading team and own core improvements to our exchange systems. You'll work across low-latency APIs, high-...SeniorImmediate start
$160k - $180k
...Senior Backend EngineerFull-time New York, NY, US Exclusive confidential search — details shared with qualified applicants.You will... ...significant architectural ownership, collaborating closely with engineering peers and product stakeholders. Hybrid (3 days onsite) in the...Senior- ...coast, Novella is building the first AI powered specialty insurance brokerage. The Role We're looking for a Senior Backend Engineer to join our team. In your day-to-day work, you'll be responsible for building all aspects of our product, from discussing big...Senior
- ...Senior Backend EngineerAs a Senior Backend Engineer, you will design, build, and deploy the backend services that power our creative brainstorming and creation products. You will work with web and video standards to power our suite of web-based image and video creation...SeniorFull timeWork at office
- ...founding team at Two Chairs and Ophelia) and an ex-Amazon Alexa engineer who led AI/ML teams at Salesforce. We've raised $10M from Accel... ...growing revenue, and the opportunity to own foundational backend systems at a critical inflection point.Mission-critical problem...Senior
- ...global media, powered by fast, reliable, and deeply technical market infrastructure.About the rolePolymarket is looking for a backend engineer to build the detection, monitoring, and case-management systems that keep our platform compliant and safe at scale.This role partners...Senior
- ...Senior Backend EngineerEllipsis Labs is a profitable, venture-backed New York-based startup building sustainable and efficient DeFi protocols... ...Solana markets.Ellipsis Labs is seeking a Senior Backend Engineer to join our team. As an early-stage startup, we appreciate...Senior
- ...Backend EngineerFull-time | NYC / Remote | BenefitsDaze is a social calendar with powerful creative tools for scheduling your future... ...What We're Looking ForWe are looking for an experienced backend engineer to help design and maintain a secure and scalable service infrastructure...SeniorRemote work
$40 per hour
...Senior Backend EngineerDoctronic | New York City ONSITE (Hybrid) | Reports to CEOThe MissionLet's make healthcare free and accessible... ...programs at top universitiesPreference for founders, founding engineers, or extensive startup experienceIndependent problem solver who...Senior$200k - $275k
...Senior Backend Engineer Title of Role: Senior Backend Engineer Location: New York, onsite Company Stage of Funding: Venture-Backed - Consumer Office Type: Onsite Salary: $200K-$275K Company Description We're representing a dynamic new dating...SeniorWork at office
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