Senior Software Engineer - Full Stack (Remote)

As the world's first intelligent communication platform, Firstup meaningfully engages employees at every moment from hire to retire, and delivers engagement insights to help companies support, promote and retain their talent. Now we need your help. We're looking for a Senior Full Stack Engineer who thrives at the intersection of craft and scale. You'll set the bar for engineering quality and help elevate those around you. Build and own scalable SaaS applications end-to-end - frontend, backend, and data layers. Performance & Reliability: Drive system availability and performance - investigate, analyze, and resolve reliability issues across the stack. Recognize opportunities and advocate for better performance and efficiency of software, systems, and processes across teams. Shift Left Testing & Quality: You champion a rigorous 'shift-left' quality culture, embedding comprehensive testing-unit, integration, and contract-early and continuously in the development lifecycle, not as an afterthought. AI Integration: Leverage and advocate for AI-assisted tools (e.g., Drive team-wide best practices, conduct quality code reviews, and mentor engineers to elevate overall engineering quality. Bachelor's degree in Computer Science or related field, or equivalent experience. ~5+ years building reliable, performant applications and microservices in production environments. Proven full stack fluency - you're comfortable across frontend, backend, and the database layer.  ~ Familiarity with Ruby on Rails, TypeScript, Node.js, or React.js is a strong plus. ~ Proven full-stack experience across frontend (React.js), backend, and database layers. ~ Technical depth in at least one engineering domain: distributed systems, multi-tenant SaaS, application databases, networking, security, serverless, event streaming, or similar. ~ Core Stack Experience: Familiarity with Ruby (including Ruby on Rails), TypeScript, Node.js, or React.js is a strong plus. We offer an excellent PTO program, great health benefits, a casual and friendly environment, remote work, and a leadership team who truly believes in your growth - both personally and professionally. Firstup is committed to providing equal employment opportunities to all applicants for employment and to all employees, without regard to race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, protected disability, veteran status, or any other protected status in accordance with applicable federal, state or local laws. #LI-Remote We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. If you would like more information about how your data is processed, please contact us.