Senior Backend Engineer (Fintech startup)

Jack; Seattle (WA); On-site; USD 120,000 - 200,000; Full time

Job summary

Jack is recruiting a Senior Backend Engineer for a Seattle-based fintech startup rebuilding its cash-advance platform. You will own the core backend, ledger, transaction processing, payment integrations, and data pipelines designed for 5–10x growth.

You’ll join a hands-on, startup environment where you move fast, ship features that move real numbers, and rely on SQL, Go, and cloud services to impact underwriting and operations daily.

Qualifications

• 2-5 years of full-time backend engineering experience
• Startup experience at seed to Series B with shipped features that moved real numbers
• BS in Computer Science or similar

Responsibilities

• Own the core backend including ledger and transaction processing
• Build and maintain data pipelines for underwriting and analytics
• Develop event-driven systems and integrations (Pub/Sub, go services)

Skills

Backend

SQL

Metrics-driven

Education

BS in Computer Science

Tools

Go

GCP

Pub/Sub

Spanner

BigQuery

MySQL

Kubernetes

Job description

We're recruiting a Senior Backend Engineer for a venture-backed fintech startup in Seattle. They help everyday people build credit and get cash when they need it. The product has real customers, and now the team is rebuilding its cash advance platform from a scrappy prototype into something that can handle hundreds of millions in originations.

This is a generalist backend role. You get handed a business outcome and you own the tech to get there.

What you'd own:

• Rebuilding the core backend: ledger, transaction processing, payment integrations, built for 5-10x growth
• Collection systems that run targeted transactions across thousands of small advances every day, reliably
• Pipelines that pull in large volumes of customer banking data to power underwriting and collections
• Event-driven systems on Pub/Sub with async workflows
• Using SQL and data to make engineering calls and show the business impact

You're probably a fit if you have:

• 2-5 years of full-time engineering, at least half of it backend
• Time at a seed to Series B startup where you shipped something that moved a real number
• Comfort writing SQL and using metrics to make decisions
• A BS in Computer Science or similar
• Bonus: fintech, payments, lending or ledger work

Who this isn't for:

• Folks whose whole career is Big Tech with no startup time
• 7+ years, staff, principal or manager level (the range really is 2-5)
• Anyone currently freelancing or contracting, or with a lot of short stints
• Mostly frontend or ETL-only profiles
• Anyone who can't be in the Seattle office 5 days a week

Stack:

Go, GCP, Pub/Sub, Spanner, BigQuery, MySQL, Kubernetes. Go isn't required if your backend depth is real.

Pay:

$120K to $200K base plus equity. Relocation help available.

Visa:

OPT and H-1B transfers are supported. They can't sponsor a new visa.