Senior Software Engineer - Fullstack/Automation

Boston, MAHybridFull Time$130k - $150kJob Description An early-stage fintech startup is seeking a Full Stack Engineer to join its growing engineering team. This role will focus on building and scaling customer-facing applications, internal platforms, and backend services that support core business operations.The ideal candidate has strong experience across the full stack, particularly with React and Node.js, and brings a quality-first mindset to software development. This position is well suited for an engineer who enjoys both building new features and ensuring applications are thoroughly tested, reliable, and production-ready. Key Responsibilities Design, develop, and deploy full-stack web applications and platform features. Build and maintain frontend applications using React and backend services using Node.js. Develop and execute automated testing strategies across web applications. Create and maintain end-to-end test suites using Playwright and Selenium. Collaborate with product, design, and engineering teams to deliver high-quality software. Identify and resolve performance, reliability, and scalability issues. Required Skills & Experience 4+ years of professional software development experience. Strong experience with React, JavaScript/TypeScript, and Node.js. Experience building and supporting production web applications. Significant experience with automated testing and quality engineering practices. Hands-on experience with Selenium and Playwright. Experience writing and maintaining end-to-end, integration, and regression tests. Experience working with REST APIs and modern web architectures. Strong problem-solving and communication skills. Desired Skills Experience working in fintech, banking, payments, or other regulated industries. Experience with cloud platforms such as AWS, Azure, or GCP. Familiarity with CI/CD pipelines and automated deployment workflows. Experience with SQL and NoSQL databases. Exposure to application security and compliance best practices. The Offer Competitive compensation package Medical, dental, and vision benefits Paid time off and company holidays Equity opportunity Professional growth and development opportunities Opportunity to make a significant impact within a growing startup Eligibility Applicants must be authorized to work in the United States without sponsorship now or in the future.Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected veteran status, or any other legally protected characteristic.