AtoB
Senior Software Engineer, Full Stack
$150K–$190K
San Francisco Bay Area +1 · Hybrid · Senior · Full-time · Posted Jan 21, 2026
- Location
- San Francisco Bay Area
New York Metropolitan Area - Experience
- 5+ years of professional experience building B2B or B2C SaaS products.
About the job
Leads and delivers full-stack software projects for payment products, from architecture and design through production operations.
What you'll do
- Lead ambiguous technical projects and establish foundations for products that can evolve and scale.
- Design, build, and maintain APIs, user-facing experiences, services, and systems; contribute across frontend, backend, and platform work.
- Develop scalable payment architecture and real-time risk controls, balancing business priorities, user experience, and reliability.
What they ask for
- 5+ years of professional experience building B2B or B2C SaaS products.
- Ability to participate in architecture discussions and contribute directly to code.
- Role requires working in the office 4 days per week (Mon–Thurs) in the San Francisco Bay Area or New York.
Nice to have
- Experience in FinTech, payments, or marketplaces.
Pay
$150K – $190K (base salary)
Tools
React, Ruby, Postgres
Model-written summary · the original posting is authoritative