Junior Full Stack Software Developer Jobs in Brooklyn, NY

Specialised Full-Time Consulting Opportunity For Experienced Full-Stack Software EngineersWe are sharing a specialised full-time consulting opportunity for experienced full-stack software engineers with hands-on production experience building and shipping modern applications across backend, frontend, database, and cloud environments.This role supports an advanced generative AI initiative focused on building, integrating, and stress-testing real software using frontier AI models. Selected engineers will develop production-quality applications and internal tools, integrate pre-release model APIs, investigate model and integration failures, and contribute working code quickly across evolving technical requirements.Key ResponsibilitiesFull-Stack Software DevelopmentBuild and ship full-stack applications, backend services, APIs, and internal engineering toolsDevelop production software using Python, Java, Rust, C#, C++, TypeScript, or related technologiesWork across backend services, frontend applications, databases, and cloud environmentsDevelop maintainable, production-quality software for realistic application workflowsContribute to architecture, implementation, testing, and deploymentAI Model & API IntegrationIntegrate pre-release AI model APIs into working softwareBuild supporting tool interfaces, application scaffolding, and evaluation harnessesDevelop telemetry and instrumentation for observing model and system behaviourTest frontier model capabilities through realistic end-to-end applicationsIdentify technical limitations and integration issues during developmentEngineering Analysis & DebuggingDiagnose model, application, and integration failure modesInvestigate unexpected system behaviour and implementation problemsDocument reproducible technical issues clearlyTranslate engineering observations into actionable written feedbackSupport research and engineering teams with technically precise findingsRapid Prototyping & DeliveryPrototype solutions quickly as requirements evolveOnboard onto unfamiliar codebases and contribute working code with minimal ramp-upDeliver functional increments with limited up-front specificationCollaborate with engineers and technical leadership on architecture and implementation decisionsMaintain consistent standards for code quality and technical documentationIdeal ProfileStrong candidates may have:At least 3 years of dedicated professional software engineering experienceHands-on experience building and shipping production softwareProduction expertise in at least one of Python, Java, Rust, C#, or C++Working proficiency in a second programming language or technical ecosystemExperience developing backend services and APIsHands-on experience with React or another modern frontend frameworkExperience with relational or document databasesFamiliarity with cloud deployment and production environmentsAbility to learn unfamiliar codebases and deliver working software quicklyDemonstrable professional progressionStrong written communication and technical reasoning skillsReliable weekday availability for approximately 40 hours per weekEducational BackgroundA degree in computer science, software engineering, computer engineering, or a related technical discipline may be helpfulAdvanced technical education may strengthen an applicationEquivalent professional software engineering experience may also be consideredHands-on production engineering experience is particularly important for this engagementNice to HaveProfessional experience across multiple programming-language ecosystemsStrong Python, Java, Rust, C#, C++, or TypeScript experienceExperience building AI-powered applicationsFamiliarity with LLM or foundation-model APIsExperience developing evaluation harnesses or engineering toolingBackground building internal developer tools or platformsExperience with cloud infrastructure and production operationsFamiliarity with observability, telemetry, and system instrumentationExperience working in fast-moving technology or research environmentsWhy This OpportunityBuild production-quality software around frontier AI systemsWork across backend, frontend, databases, cloud, and model-integration workflowsTest advanced AI capabilities through realistic software applicationsIdentify technical limitations and integration failures before broader deploymentCollaborate with experienced engineering and research teamsDevelop working software across multiple modern technology stacksContribute full-time to technically demanding, rapidly evolving projectsContract DetailsFull-time W-2 contingent employment opportunityExpected commitment of approximately 40 hours per week during weekdaysCompetitive rates between $45–$60 per hour depending on experience and project scopeWork may include full-stack application development, API integration, AI model testing, debugging, engineering tooling, and technical documentationCandidates should have production experience in at least one of Python, Java, Rust, C#, or C++, together with working proficiency in a second technical ecosystemProjects and responsibilities may evolve according to research and engineering requirementsAbout the PlatformThis opportunity is available through 24-MAG LLC. We connect experienced professionals with remote consulting opportunities across technical, evaluation, and project-based workstreams.By submitting this application, you acknowledge that your information may be processed by 24-MAG LLC for recruitment and opportunity matching in accordance with our Privacy Policy: https://www.24-mag.com/privacy-policy.