Principal Full Stack Engineer

Principal Full Stack Engineer – Payactiv

$/yr - $/yr

Location:

Austin, TX (Onsite at our Office in The Domain area)

We are Payactiv, a mission‑driven Fin Tech company and the pioneer in Earned Wage Access. As the only Certified B Corporation and Public Benefit Corporation in our space, we are committed to making a difference by providing millions of workers with financial flexibility and wellness tools. Our mobile and web apps help users avoid debt traps, manage money smartly, and gain control over their financial lives.

You are a seasoned Full Stack Engineer and technical leader with deep expertise in both front‑end and back‑end technologies. You care about clean code, scalable systems, and delivering products that make a positive impact. You’ve built and led complex, high‑performing platforms and can mentor others while remaining hands‑on. You’re driven by outcomes, passionate about user experience, and thrive in collaborative, agile environments.

• Architect, design, and build end‑to‑end web and mobile applications using React, .NET Core, and cloud‑native technologies.
• Lead the development of robust, scalable systems across front‑end and back‑end layers.
• Guide the adoption of modern architectural patterns such as Micro Frontends and Microservices.
• Collaborate cross‑functionally with design, product, and other engineering teams to deliver seamless user experiences.
• Participate in the integration effort between front‑end and back‑end components.
• Implement Dev Ops best practices and CI/CD pipelines to ensure efficient and reliable deployments.
• Provide technical mentorship and code reviews to team members.
• Optimize applications for performance, security, and maintainability.

• Bachelor’s or Master’s degree in Computer Science, Engineering, or equivalent experience.
• 8+ years of professional software development experience.
• Proven full‑stack expertise, with strong skills in:
• Front‑End:
  React; modern UI/UX design principles; responsive design.
• Back‑End: C#, .NET Core, SQL/No
  
  SQL, Postgre
  
  SQL, RESTful APIs.
• Cloud/Dev Ops: AWS (Lambda, S3, EC2, RDS), CI/CD pipelines.
• Experience leading architecture, code quality, and technical decisions at a senior level.
• Solid understanding of system design, performance optimization, and application security.
• Bonus:
  Experience with Python or data processing tools.

• Company-sponsored health, dental, and vision insurance
• Health, dental, and vision reimbursement accounts
• 401(k), both traditional and Roth with company match
• Tuition assistance or reimbursement
• Unlimited paid time off
• Monthly gym reimbursement
• Paid time off to volunteer
• Paid family leave
• Complimentary office lunches
• A purpose‑driven culture and an opportunity to grow with a passionate team

Referrals increase your chances of interviewing at Payactiv by 2x.