Senior Software Engineer, Merchant Platform

About Us

At Parafin, we’re on a mission to grow small businesses. Small businesses are the backbone of our economy, but traditional banks often don’t have their backs. We build tech that makes it simple for small businesses to access the financial tools they need through the platforms they already sell on. We partner with companies like DoorDash, Amazon, Worldpay, and Mindbody to offer fast and flexible funding, spend management, and savings tools to their small business users via a simple integration. Parafin takes on all the complexity of capital markets, underwriting, servicing, compliance, and customer service for our partners. We’re a tight-knit team of innovators hailing from Stripe, Square, Plaid, Coinbase, Robinhood, CERN, and more — all united by a passion for building tools that help small businesses succeed. Parafin is backed by prominent venture capitalists including GIC, Notable Capital, Redpoint Ventures, Ribbit Capital, and Thrive Capital. Parafin is a Series C company, and we have raised more than $194M in equity and $340M in debt facilities. Join us in creating a future where every small business has the financial tools they need.

About the Position

We are looking for an experienced user-focused backend software engineer to join our Partner Platform team in San Francisco. You will play a crucial role in shaping the partner experience at Parafin by building industry‑leading developer‑first experiences. The Partner Platform team owns the foundational systems that power partner integrations at Parafin. We build and operate partner data ingestion pipelines, DAG‑based processing systems, public APIs, durable webhook delivery infrastructure, sandbox environments, and partner‑specific integrations. We collaborate across engineering and data teams to ensure partner data reliably powers underwriting, risk evaluation, and reporting workflows. Our roadmap includes major platform modernization efforts, including evolving our data architecture and strengthening the reliability and scalability of our asynchronous, event‑driven systems. The ideal candidate will thrive in a fast‑paced environment, demonstrating strong technical fundamentals, the ability to navigate ambiguity, and the ownership of projects from inception to completion.

What You’ll Be Doing

• You will take ownership of key components of our partner platform infrastructure, including partner data ingestion and sharing systems and public APIs, and external webhook delivery systems, and lead exciting new initiatives leveraging our partner‑facing interfaces
• You will drive impactful product initiatives aligned with the product vision for the ultimate partner journey with Parafin, including the partner-facing dashboard, developer tooling, data integrations, and the platform systems that power ingestion, APIs, and real‑time partner updates
• You will collaborate with stakeholders across the company to prioritize and design new products and experiments
• You will design and operate asynchronous, event‑driven systems to reliably process partner data and deliver real‑time updates to partner systems

What We’re Searching For

• 5+ years of experience building and operating production backend or platform systems
• Bachelor’s Degree or higher in Computer Science (or related field)
• You care deeply about building high‑quality software and take immense pride in your craft
• You are comfortable owning and driving the development of both product and platform initiatives from scratch
• You take the initiative to identify commonalities between different problem statements and design appropriate abstractions accordingly
• You have a strong grasp of engineering fundamentals
• You have experience building and operating asynchronous systems or data pipelines in production environments
• You are excited about working on a small team and helping us set the foundations for the company

What We Offer

• Salary Range: $230k-$265k
• Equity grant
• Medical, dental & vision insurance
• Work from home flexibility
• Unlimited PTO
• Commuter benefits
• Free lunches
• Paid parental leave
• 401(k)
• Employee assistance program

If you require reasonable accommodation in completing this application, interviewing, completing any pre‑employment testing, or otherwise participating in the employee selection process, please contact us.