Senior Software Engineer, Checkr Trust (Ruby/Rails)

Checkr • San Francisco, California, United States • 2w ago

Why This Job is Featured on The SaaS Jobs

Checkr Trust sits in a distinct corner of the SaaS landscape: trust-and-safety infrastructure that becomes more valuable as platforms scale across industries. Building risk-signal products that serve tens of millions of users brings the kind of real-world constraints—latency, data quality, and reliability—that many SaaS teams only encounter later. The “start-up lab” framing also signals a product area that behaves like an internal venture, where iteration and customer feedback loops are central.

For a senior engineer building a SaaS career, this role offers durable exposure to end-to-end product development in a regulated-adjacent domain where mistakes are costly and observability matters. The mix of Ruby/Rails and React, API design, third-party integrations, and event-driven architecture maps closely to common SaaS platform patterns, while experimentation and measurement sharpen skills that transfer to growth, onboarding, and risk workflows across B2B products.

This role tends to fit engineers who prefer owning outcomes rather than isolated tickets, and who are comfortable forming product opinions in partnership with non-engineering stakeholders. It also suits practitioners who like balancing speed with engineering rigor, and who want their technical decisions to connect directly to customer impact in a SaaS setting.

The section above is editorial commentary from The SaaS Jobs, provided to help SaaS professionals understand the role in a broader industry context.

Job Description

Checkr Trust is building safer communities by providing our customers with risk signals about its users. Every year, our team provides insights on tens of millions of users across multiple verticals: online dating, caregiving, car rental, short-term rentals and many more. We acquire, analyze, and deliver insights in smart, scalable ways that help organizations identify and mitigate risk. We are part of the Checkr start-up lab: we operate with the speed of a small startup, while enjoying the leverage and resources of a known technology brand.

Since launching, we’ve seen significant growth and we are looking for a Senior Full Stack Software Engineer to play a pivotal role in the continued growth of our startup.

You are the right fit if:

You have strong product opinions and aren’t afraid to voice them.
You are comfortable with ambiguity and rapidly changing priorities.
You value in-person collaboration and fast iteration with the team.
You know when to optimize for speed versus striving for perfection.
You are comfortable working access the entire software stack.
You take full ownership—from idea to execution to real customer and business impact.

Responsibilities:

Work closely with customers, engineers, and leaders to design, build, and launch new products.
Take full ownership of the entire process of developing end-to-end applications – from shaping the idea to delivering the finished application.
Build and improve APIs, including integrating with third-party services to expand what our products can do.
Embrace a customer-centric, product-first approach – partner directly with customer success, customers and stakeholders to better understand their needs and turn those into useful features.
Keep code reliable and easy to maintain with solid testing, thoughtful reviews, and good practices.
Run and measure product experiments, using what you learn to guide future development.
Building scalable APIs and asynchronous event-based architecture that can reliably handle very high traffic.

What you bring:

BS/MS degree in either computer science or electrical engineering
Have founded or held early roles at successful fast-paced startups
6+ years of full stack software development experience
Advanced knowledge in Ruby (Ruby on Rails)/ Javascript (React), or similar languages/frameworks
Amazing product sense - we will ask you how the product should look like
Experimentation mindset - autonomy and empowerment to validate a customer need, get team buy-in, and ship a rapid MVP
Experience building scalable technical architecture that can scale to 10mm+ users (including observability tooling, container orchestration, etc)

Nice to have:

Experience with trust & safety, IDV, background check products or criminal data
Experience with data analysis and processing
Experience building and working with scrapers and scraping technology

We are committed to leveling the playing field and welcome all interested candidates to apply, even if you don’t meet every qualification outlined above.

What you get: