Top Senior Javascript Jobs in Miami, FL

Lead end-to-end development of modern frontend initiatives using React and Electron. Design scalable architecture, improve performance and test coverage, resolve production issues, influence technical decisions, and collaborate with Product, Design, and Backend teams. The role includes mentoring engineers, maintaining code quality, supporting observability and incident response, and building secure, high-quality customer-facing payment and form workflows.

Leads development and sustainment of the DOW logistics application using Java, JavaScript, and SQL. Designs application components, integrations, backend services, and system architecture; provides technical guidance; troubleshoots issues; improves performance; enforces code quality; collaborates with QA, DevSecOps, and systems engineers; and maintains technical documentation.

Build and own AI-assisted development infrastructure, including autonomous cloud development environments, MCP integrations, agent documentation, internal tooling, and enablement programs. Improve how engineering teams use AI coding agents across the organization, drive cross-team adoption, and stay current with AI productivity trends. The role requires strong software engineering, developer tooling, cloud infrastructure, CI/CD, and application development experience.

Design, develop, secure, and maintain mission-critical Microsoft-platform software for DoD programs. Build C# and .NET applications, responsive JavaScript and EXT JS interfaces, REST APIs, and optimized SQL Server databases. Apply secure coding, STIG, RMF, threat modeling, vulnerability remediation, documentation, and compliance practices. Integrate Kiro AI capabilities, collaborate with cybersecurity and engineering teams, and support deployment and sustainment in classified or controlled environments.

Lead front-end architecture and cross-team technical initiatives for the NodeZero platform. Build scalable React and TypeScript systems, reusable components, developer tooling, and shared frameworks while improving performance, reliability, accessibility, observability, and CI/CD workflows. Mentor engineers, establish engineering standards, guide technical strategy, reduce technical debt, and collaborate with Product, Design, Platform, Security, and engineering teams.

The Senior Salesforce Developer designs, develops, tests, integrates, and launches Salesforce solutions for customers and internal products. Responsibilities include requirements definition, solution architecture, Lightning Web Components, Apex, JavaScript, Flows, Salesforce and external-system integrations, deployment management, SDLC ownership, and mentoring junior developers. The role also involves staying current with Salesforce features, training the team, collaborating with architects and customers, and potentially traveling up to 25%.

Design, develop, and maintain scalable cloud-native backend applications using Node.js, React, and AWS services. Build secure, high-performing solutions supporting federal missions, troubleshoot complex issues, collaborate with cross-functional teams, and contribute to agile development. Responsibilities include working with serverless services, databases, CI/CD tools, and modern JavaScript technologies while delivering high-quality software.

Build and maintain production software implementing healthcare interoperability standards, including FHIR and HL7. Develop APIs, services, data pipelines, validation logic, data models, and automated tests while preserving clinical meaning and data quality. Collaborate with engineers, data scientists, healthcare professionals, product managers, and operations staff to deliver scalable healthcare solutions.

Develop and maintain high-scale JavaScript and TypeScript advertising technology, specializing in Prebid.js, Prebid Server, header bidding, and Google Ad Manager. Own the header bidding wrapper, implement ad tech integrations, monitor Core Web Vitals and performance, review code, track industry standards, and maintain deployed solutions. The role requires deep programmatic advertising expertise, Google Cloud experience, and ownership of reliable client-side monetization systems.

Build production-grade test automation infrastructure across API, integration, end-to-end, contract, regression, load, and performance testing. Develop Playwright suites, integrate automated tests with GitHub Actions release gates, create AI-assisted test generation workflows, maintain coverage dashboards, reduce flakiness, and establish performance-testing frameworks. Partner with engineers and product managers to define coverage, acceptance criteria, performance thresholds, and quality standards across the organization.

Own the managed services tooling ecosystem, building API, webhook, and email integrations across RMM, monitoring, backup, and ITSM platforms. Configure Jira Service Management, reduce alert noise, troubleshoot tooling failures, establish integration standards, evaluate new tools, and ensure customer-specific rollouts. Produce operational reporting, explain tooling to customers, and maintain auditable documentation within ITIL-aligned change management processes.

Build core experiences for bank administrators and customers by developing streamlined user flows, robust APIs, and third-party integrations. The role emphasizes clean, documented, tested code; system design; error handling; performance; domain-driven design; microservice architecture; and technical guidance through code reviews. Candidates will primarily work with front-end technologies while contributing to backend services in an agile Scrum environment.

Leads and grows an engineering team responsible for customer-facing web, mobile, and backend products. Owns delivery, technical direction, architecture, reliability, hiring, coaching, and career development. Partners with Product and Design to prioritize work and deliver dependable releases. Establishes AI-assisted engineering practices, supports AI-powered customer experiences, and builds systems for scheduling, payments, client management, notifications, and integrations.

Build, deploy, and own scalable consumer applications and services for a digital lending platform, with a focus on React frontend development. Responsibilities include designing features, automated testing, full software development lifecycle participation, collaboration with cross-functional teams, system scalability and reliability, technical debt reduction, mentoring frontend engineers, and using AI-driven coding agents and agentic workflows.

Design, develop, and maintain complex distributed software systems. Translate product requirements into scalable, secure, modular designs; write well-tested code; lead design and code reviews; guide agile sprint teams; collaborate with stakeholders; and mentor engineers. The role also contributes to technical strategy, resolves delivery impediments, and promotes engineering best practices.

Leads and develops a Quality Engineering team while defining scalable automation frameworks and AI-enabled testing workflows. Owns testing strategy across web, mobile, API, performance, accessibility, integration, and regression testing. Partners with Product, Engineering, Architecture, DevOps, and Business Analysis to advance shift-left quality, CI/CD quality gates, release readiness, platform resiliency, and quality metrics. Drives modernization of legacy tools, automation adoption, AI-assisted testing, continuous improvement, and business-aligned quality outcomes.

Build and scale highly available applications and services for Mux’s video platform. Develop customer-facing features across Elixir and Go backend services and React frontend applications, including billing, usage, identity, account management, webhooks, and alerting. Collaborate on technical roadmaps while solving distributed systems, concurrency, scheduling, scaling, and platform resilience challenges. Deploy complex applications using cloud platforms and Kubernetes.

Lead full-stack development for secure, scalable mission planning and command-and-control software supporting space communications programs. Build frontend interfaces and backend services, design APIs, translate mockups into applications, conduct code reviews, improve quality and security, and mentor junior engineers. Work with modern web frameworks, containerized microservices, and highly secure government environments while owning technical problems end to end.

Serve as the technical anchor for a cross-functional engineering squad building healthcare data platforms. Design and maintain Java Spring Boot, React, and Python data-processing applications; guide architecture, code quality, estimation, releases, integrations, and issue resolution. Build reliable data delivery pipelines, mentor peers, support Agile execution, and promote responsible AI-assisted development using tools such as GitHub Copilot.

Designs and maintains automated test frameworks for web, API, and mobile applications. Performs functional, regression, integration, and end-to-end testing; validates APIs, databases, and integrations; integrates tests into CI/CD pipelines; manages defects; collaborates with development and product teams in Agile ceremonies; and provides quality metrics and reporting.

Build and operate backend services, APIs, data models, event-driven pipelines, internal applications, and integrations supporting high-volume grading operations. Develop end-to-end features with JavaScript, TypeScript, and Vue.js; troubleshoot data, service, integration, and UI issues; contribute to system design, testing, observability, documentation, and on-call support. Collaborate with Product, Technology, and Operations teams to create scalable systems and improve engineering practices.

Design and operate scalable, secure, highly available AWS infrastructure for a revenue management platform. Build infrastructure automation, CI/CD tooling, monitoring, and developer tools; advise on architecture, improve reliability and security, troubleshoot 24/7 incidents, lead root cause analyses, support AI-enabled DevOps workflows, and mentor engineers. The role participates in a weekly on-call rotation and is remote in the US or Canada.

Designs, develops, tests, troubleshoots, documents, and maintains software applications throughout the project lifecycle. Responsibilities include coding, database and system administration, performance testing, debugging, software upgrades, requirements documentation, user support, vendor coordination, and collaboration with analysts, administrators, and engineers. The role also provides guidance to junior development staff and supports cross-departmental projects.

Own web compatibility triage and incident response across DuckDuckGo browsers on Mac, Windows, iOS, and Android. Debug complex web applications and third-party code, distinguish site, browser, and privacy-related issues, reverse-engineer obfuscated code, build durable cross-platform fixes, and develop automation and LLM agent tooling to reproduce and triage breakage. Lead ambiguous projects independently and communicate with technical and non-technical stakeholders.

Develop and deploy a cloud-ready PostgreSQL/PostGIS database, Python REST APIs, ETL workflows, React interfaces, dashboards, and GIS visualization tools for the USGS Volcano Hazards Program. Ensure accessibility, security compliance, documentation, testing, and interoperability across volcano observatories. Collaborate with government stakeholders, support federal certification activities, and participate in up to three onsite visits during the 12-month engagement.