[Remote] Senior Full Stack Developer - React, C# .NET, Typescript (RSG0001)

Note: The job is a remote job and is open to candidates in USA. hammerjack connects skilled professionals in the Philippines with growing businesses across Australia and beyond. They are seeking a Senior Full Stack Developer to join their engineering team and help build scalable, high-quality web applications using React, TypeScript, and C#/.NET.ResponsibilitiesDesign, develop, and maintain full-stack web applications using React, TypeScript, and C#/.NETBuild responsive, accessible, and user-friendly interfaces that deliver exceptional user experiencesDevelop and maintain APIs, backend services, and database solutionsCollaborate with product, design, and engineering teams to deliver new features and enhancementsParticipate in technical design discussions and contribute to architectural decisionsWrite clean, maintainable, and well-tested code following development best practicesPerform code reviews and support continuous improvement initiatives across the engineering teamTroubleshoot, debug, and resolve issues across frontend and backend systemsContribute to application performance, scalability, security, and reliabilityStay up to date with emerging technologies and development practicesSkills5+ years of experience shipping production software as a Full Stack Engineer, with strong frontend and backend expertiseDeep experience with React and TypeScript (strict mode), including generics, discriminated unions, hooks, and modern development patternsStrong experience with C#/.NET, including minimal APIs, async/await, Entity Framework Core (or equivalent ORM), and recent .NET versionsStrong RDBMS experience, preferably PostgreSQL, including schema design, complex queries, and database migrationsExperience designing and maintaining APIs, particularly REST services, with an understanding of service contracts and integration best practicesSolid understanding of accessibility standards, including WCAG 2.1/2.2 AA, ARIA, keyboard navigation, and screen reader testingStrong testing discipline with experience across unit, integration, and end-to-end testing frameworksBased in Australia with full working rightsExperience building or contributing to design systems, including tokens, primitives, theming, and versioningExperience developing canvas-based, drag-and-drop, or visual editor interfaces using tools such as React Flow, xyflow, or dnd-kitExperience building real-time applications using SignalR, WebSockets, or similar technologiesExposure to workflow or rules engines such as Elsa or FlowableExperience working with event-driven architectures using RabbitMQ, Kafka, or similar technologiesExperience working within Kubernetes and Helm environmentsComfortable using AI-assisted development tools such as Claude Code, Cursor, or GitHub Copilot beyond basic autocompleteBenefitsFlexibility: Work hybrid with options across Makati and Pampanga, aligned to day shift roles with Australian clients.Workspaces that Work: Modern offices designed for focus, collaboration, and real productivity.Coffee and After-Hours Drinks: Barista coffee on demand and a café bar to unwind after work.Meals Covered: Complimentary meals once a week on your onsite day.Health Coverage from Day One: Includes dependent options, so you’re covered from the start.Competitive Compensation: Transparent salary packages with direct client involvement.Career Growth: Ongoing training and real opportunities to step into bigger roles.Recognised Workplace: Part of a team ranked 8th Best Workplace in the Philippines and recognised among Fortune Best Workplaces in Southeast Asia.Supportive Team Environment: Work with people who are easy to work with, reliable, and invested in doing good work.Global Exposure: Work directly with international clients and be part of how teams scale globally.Company OverviewHammerJack is providing enterprise level IT and BPO service solutions to businesses, large and small. It was founded in 2015, and is headquartered in Sydney, New South Wales, AUS, with a workforce of 501-1000 employees. Its website is http://hammerjack.com.au/.