Senior Full-Stack Software Engineer 100% Remote | Must have at least 4 hours of overlap with US Eastern Time (EST) About Ascen Ascen (ascen.com) is a Y Combinator-funded back-office platform built exclusively for staffing companies. We empower staffing firms to focus on their clients and candidates by providing a robust suite of back-office services—including contractor onboarding, timesheets, payroll, invoicing, funding, and employer of record—within a sleek, white-label, all-in-one platform. We're profitable, experiencing rapid growth, and backed by leading investors, including Y Combinator. Now, we're seeking an experienced Senior Full-Stack Software Engineer to join our remote team and help drive our next phase of innovation. Role Overview In this role, you will be a crucial contributor to our platform, designing and implementing features across the tech stack, optimizing performance, and ensuring the highest security standards. You'll have a chance to build impactful solutions that streamline staffing operations for our clients. Ideal Qualifications 7 years of experience in Python. 7 years of experience building web applications (FastAPI, Django, or Flask). 2 years of experience with JavaScript frameworks (React or Vue). Comfortable independently developing full-stack features, from backend to frontend. Extensive knowledge of cybersecurity best practices. Experience with payments or fintech is preferred. Must be able to work with at least 4 hours of overlap with US Eastern Time (EST) . Interview Process Introductory Call – 15-30 minutes Meet with a member of our team for a brief conversation about your background and the role. Technical Deep Dive – 45-60 minutes Walk us through a feature or project you've built, focusing on code review, design decisions, improvements, and lessons learned. This is an opportunity to showcase your technical expertise and problem-solving approach.