Senior Software Engineer at TestBox

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.
She will pick the best candidates from Jack's network

The next step is to speak to Jack.

Job Title: Senior Software Engineer

Company Description: VC-backed B2B software platform

Job Description:
Join a fast-growing, VC-backed B2B software platform as a Senior Backend Engineer. This greenfield opportunity involves designing and building the core, resilient, scalable, and asynchronous backend infrastructure that will power the next generation of software transactions. You'll be a key voice in technical direction, solving complex distributed systems problems and making a massive impact from day one.

Location: San Francisco, USA

Why this role is remarkable:

• Build foundational, greenfield systems from the ground up, making a massive impact.

• Join a fast-growing platform backed by top-tier VCs, disrupting traditional B2B sales.

• Shape the technical foundation that will power the company's growth for the next decade.

What you will do:

• Design and build core backend services enabling complex, long-running, and asynchronous operations.

• Create foundational frameworks and libraries for the engineering team to build new product capabilities.

• Partner with leadership to drive key technology and design decisions, establishing best practices.

The ideal candidate:

• A systems thinker who designs for resilience, scalability, and observability.

• 5+ years of experience in backend software engineering, including complex distributed systems.

• Deep expertise in a modern backend language (e.g., Python, Go, Java) and event-driven design.

Who are Jack & Jill?
Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Next steps
Step 1. Visit our website.
Step 2. Click 'Talk to Jack'.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.
Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs
This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't much we can do about it.
Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.