Senior Software Engineer

Finix

San Francisco on site Until 8/21/2026 4+ years exp H-1B sponsor history First posted March 22, 2025 Last posted May 7, 2026

Job description

About Finix

Finix is building the global operating system for fintech, starting with payments. From startups to publicly traded companies, Finix processes tens of billions of dollars annually both in-store and online. Finix was founded in 2015 and is headquartered in San Francisco.

To date Finix has raised over $200M, including a $75M Series C led by Acrew Capital and Lightspeed Venture Partners and backed by American Express Ventures, Bain Capital Ventures, Homebrew, Inspired Capital, Visa, and others

About the role

The engineering team owns the delivery and stability of our product end to end. Since Finix serves as the complete payment platform of our customers’, our engineering team owns our customers’ ability to capture revenue. The Sr. Software Engineer role centers around envisioning superior technical solutions to our customers’ payment needs, leading its implementation and continuously ensuring reliable service to our customers. You will have broad autonomy and responsibility for formulating the best solution possible and working with your peers to deliver your vision. Finix is looking for a team member to join our engineering team who brings exceptional technical acumen, attention to detail, interest to grow and an obsession with building excellent, performing and scalable software.

You will

Deep dive into our customers’ needs, and work with product management to define new services
Own the technical vision, implementation, best practices and infrastructure within your domain
Develop close relationships with product management and peer engineers
Become an expert in your payments domain and mentor junior software engineers
Proactively improve our architecture, frameworks, tooling, automation, and best practices

You are

Experienced in designing, implementing, and testing superior software
Comfortable continuously delivering code, infrastructure, tests and features to production
Excited about finding new and better ways to make software reliable, scale and perform
Obsessed with finding edge cases, understanding requirements and design implications
Proactive in monitoring running systems and troubleshooting production issues
Always looking for ways to grow, opportunities to mentor and collaborate with peers

You have

Have 4+ years of experience building and designing systems with several lifecycles
Extensive experience implementing secure APIs, highly available and observable services
Led and mentored more junior software engineers
Kept tight control on multiple competing priorities and have strong ability to multitask
Raised the bar on every project you were involved in

Compensation (from employer):
150000–220000 USD per year

About this role

Summary

Design, implement, and optimize payment systems, APIs, and infrastructure.

Job title

Senior Software Engineer

Experience level

4+ years

Minimum experience

4+ years exp

Industry

software

Location requirements

San Francisco, on-site preferred, remote optional

Salary

$150k–$220k

Visa sponsorship

H-1B sponsor history

Management role

Yes

Skills & keywords

Required skills

software developmentAPI implementationsystem designsecure codinghigh availability

Preferred skills

None specified

Specializations

APIscalable systemspayment processing

Locations

Structured locations inferred from the posting.

San Francisco, CA, USA

On-site City