We are looking for an experienced Senior Fullstack Software Engineer to join our dynamic team in New York, New York. In this role, you will be responsible for designing, building, and maintaining high-performance transactional systems that power commercial products and services. If you&#39;re passionate about developing scalable software solutions and thrive in a collaborative environment, we encourage you to apply.<br><br>Responsibilities:<br>• Develop and manage robust transactional systems across the full stack, ensuring performance and reliability.<br>• Design, implement, and maintain both back-end and front-end software components using Node.js, TypeScript, and React.<br>• Collaborate closely with team members to deliver high-quality products efficiently.<br>• Build scalable, real-time systems leveraging cloud infrastructure.<br>• Debug and resolve complex technical issues to ensure system reliability, recovery, and scalability.<br>• Participate in the full software development lifecycle, from initial design through coding, testing, and deployment.<br>• Stay informed about emerging industry trends and technologies to enhance system performance.<br>• Optimize high-volume services by benchmarking and fine-tuning performance.<br>• Utilize WebSockets and other real-time data transport technologies to support system functionality.

• Proven experience in shipping multiple commercial products to active user bases.<br>• Minimum of 5-7 years of experience as a Full Stack Developer with attention to detail.<br>• Advanced proficiency in Node.js, TypeScript, and React.<br>• Expertise in JavaScript and strong knowledge of real-time systems and cloud infrastructure.<br>• Familiarity with WebSockets and other real-time data transport technologies.<br>• Demonstrated ability to benchmark and optimize high-performance services.<br>• Strong communication and collaboration skills, with a team-oriented mindset.<br>• Exceptional problem-solving skills and ability to tackle complex development challenges.

<h3 class="rh-display-3--rich-text">Technology Doesn't Change the World, People Do.^®</h3> <p>Robert Half is the world’s first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles.</p> <p>Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. <a href="https://www.roberthalf.com/us/en/mobile-app" target="_blank">Download the Robert Half app</a> and get 1-tap apply, notifications of AI-matched jobs, and much more.</p> <p>All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit <a href="https://roberthalf.gobenefits.net/" target="_blank">roberthalf.gobenefits.net</a> for more information.</p> <p>© 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking “Apply Now,” you’re agreeing to Robert Half’s <a href="https://www.roberthalf.com/us/en/terms">Terms of Use</a> and <a href="https://www.roberthalf.com/us/en/privacy">Privacy Notice</a>.</p>