{"schemaVersion":"jobsearcher.job.v1","id":"7924ddf744d45bfe77494d4a","url":"https://jobsearcher.com/jobs/7924ddf744d45bfe77494d4a","canonicalUrl":"https://jobsearcher.com/jobs/7924ddf744d45bfe77494d4a","title":"Backend Developer - Data Annotation Systems","description":"Backend Developer — Data Annotation Systems (AI Training)About The RoleWhat if your Python expertise could directly shape the infrastructure behind the most advanced AI systems in the world? We're looking for a Senior Python Full-Stack Engineer to design and build the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation models.This is a fully remote, flexible contract role for an experienced engineer who thrives on high-impact systems work and wants to be close to the frontier of AI development.Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance Python systems that power AI data pipelines and model evaluation workflowsDevelop full-stack backend services and tooling for large-scale data annotation, validation, and quality controlBuild and maintain asynchronous task queues to handle complex, long-running background jobs at scaleOptimize database queries for high-read/write workloads and serve data via real-time protocols such as WebSocketsImprove reliability, performance, and safety across existing Python codebasesCollaborate closely with data, research, and engineering teams to support model training and evaluation workflowsIdentify bottlenecks and edge cases in system and data behavior, then implement scalable, production-ready fixesParticipate in synchronous design reviews to iterate on architecture and implementation decisionsWho You AreNative or fluent English speaker with clear written and verbal communication skillsFull-stack developer with a strong systems programming background and 3–5+ years of professional Python experienceProven experience building and shipping production-grade Python applicationsExperienced with asynchronous task queues and background job processingSkilled at optimizing database performance for demanding, high-throughput applicationsComfortable working with real-time data protocols (e.g., WebSockets)Self-directed and reliable — able to commit 20–40 hours per week and deliver consistently without hand-holdingNice to HavePrior experience with data annotation, data quality pipelines, or model evaluation infrastructureFamiliarity with AI/ML workflows, model training, or benchmarking systemsExperience with distributed systems, developer tooling, or data engineeringWhy Join UsWork directly with leading AI labs on production systems that matterFully remote and flexible — structure your work around your scheduleFreelance autonomy with the substance of high-impact engineering workGet hands-on exposure to the cutting edge of AI infrastructure and research workflowsPotential for ongoing work and contract extension as projects scale","company":"Alignerr","rawCompany":"alignerr","city":"New York","state":"NY","isRemote":false,"isActive":false,"createdAt":"2026-04-09T08:01:51.427Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-2051.00","title":"Data Scientists","slug":"data-scientists"},{"code":"15-1251.00","title":"Computer Programmers","slug":"computer-programmers"}],"industries":[{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Backend Developer - Data Annotation Systems","description":"Backend Developer — Data Annotation Systems (AI Training)About The RoleWhat if your Python expertise could directly shape the infrastructure behind the most advanced AI systems in the world? We're looking for a Senior Python Full-Stack Engineer to design and build the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation models.This is a fully remote, flexible contract role for an experienced engineer who thrives on high-impact systems work and wants to be close to the frontier of AI development.Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance Python systems that power AI data pipelines and model evaluation workflowsDevelop full-stack backend services and tooling for large-scale data annotation, validation, and quality controlBuild and maintain asynchronous task queues to handle complex, long-running background jobs at scaleOptimize database queries for high-read/write workloads and serve data via real-time protocols such as WebSocketsImprove reliability, performance, and safety across existing Python codebasesCollaborate closely with data, research, and engineering teams to support model training and evaluation workflowsIdentify bottlenecks and edge cases in system and data behavior, then implement scalable, production-ready fixesParticipate in synchronous design reviews to iterate on architecture and implementation decisionsWho You AreNative or fluent English speaker with clear written and verbal communication skillsFull-stack developer with a strong systems programming background and 3–5+ years of professional Python experienceProven experience building and shipping production-grade Python applicationsExperienced with asynchronous task queues and background job processingSkilled at optimizing database performance for demanding, high-throughput applicationsComfortable working with real-time data protocols (e.g., WebSockets)Self-directed and reliable — able to commit 20–40 hours per week and deliver consistently without hand-holdingNice to HavePrior experience with data annotation, data quality pipelines, or model evaluation infrastructureFamiliarity with AI/ML workflows, model training, or benchmarking systemsExperience with distributed systems, developer tooling, or data engineeringWhy Join UsWork directly with leading AI labs on production systems that matterFully remote and flexible — structure your work around your scheduleFreelance autonomy with the substance of high-impact engineering workGet hands-on exposure to the cutting edge of AI infrastructure and research workflowsPotential for ongoing work and contract extension as projects scale","datePosted":"2026-04-09T08:01:51.427Z","dateModified":"2026-04-09T08:01:51.427Z","hiringOrganization":{"@type":"Organization","name":"Alignerr","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"New York","addressRegion":"NY","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"7924ddf744d45bfe77494d4a"},"url":"https://jobsearcher.com/jobs/7924ddf744d45bfe77494d4a"}}