Senior Backend Engineer - Grant Underwriting and Payment

About Grant

Grant is revolutionizing financial access through our intelligent cash advance product. We're solving real customer pain points by providing fast, fair access to earned wages when life happens, without the predatory fees common in the industry. Our business model is profitable while maintaining customer-first values, and we're experiencing rapid user growth as we scale our impact.

Recent Team Accomplishments

Our engineering team is pushing the boundaries of what's possible in fintech infrastructure:

• Advanced Underwriting Engine: Developed sophisticated underwriting ML models that leverage unstructured transaction data to make instant, accurate lending decisions at scale

• Smart Collection System: Built ML-powered collection strategies using mathematical models and algorithms

• Real-Time Payments (RTP) Integration: integrated and deployed RTP rail support alongside our existing ACH infrastructure, enabling instant fund disbursement and same-day collections - a critical differentiator in our market

The Role

We're looking for a Senior Backend Engineer to join our Grant Core team and help us scale. You'll be working on the critical systems that power our underwriting decisions, payment processing, and collection strategies.

Key Focus Areas:

• Payment Infrastructure: Own and scale our multi-rail payment systems (ACH, RTP, card networks) to handle transaction volume while maintaining 99.99% reliability

• Distributed Systems: Design and build scalable backend services that can handle millions of transactions with low latency and high throughput

• Background Processing: Optimize our Sidekiq job infrastructure to efficiently process complex workflows for underwriting, collections, and payment distribution

• System Architecture: Lead architectural decisions for our core financial systems, balancing speed, reliability, and cost as we scale

• Data Pipeline Engineering: Build robust data pipelines that power our ML models and real-time decision engines

• You'll work closely with our product and data science teams to ship features that directly impact our customers' financial wellbeing while maintaining the highest standards of reliability and security.

Required Experience:

• 5+ years of experience with modern backend frameworks and a track record of building and scaling production systems

• Strong systems design skills - you've architected and shipped distributed systems that handle high throughput and maintain data consistency

• Production experience with background job processing systems (Sidekiq, Resque, or similar)

• Solid understanding of database optimization, caching strategies, and performance tuning

Ideal Candidate Also Has:

• Experience with payment systems, financial infrastructure, or regulated environments (ACH, card processing, real-time payments)

• Track record of making infrastructure decisions that balance technical excellence with business pragmatism

• Experience working with ML/data science teams to productionize models and algorithms

• Background in fintech, payments, or lending infrastructure

• Strong system observability mindset (metrics, logging, tracing, monitoring)

• Technical Leadership: Ability to own complex technical initiatives end-to-end, from design through implementation and rollout

• Mentorship: Help level up the team through code reviews, design docs, and technical guidance

• Impact Focus: Balance technical perfection with pragmatic delivery - you know when to build for scale vs. ship fast

• Cross-functional Collaboration: Partner effectively with product, data science, and operations to deliver customer value

• Operational Excellence: Take ownership of the reliability and performance of the systems you build

What Makes This Role Exciting:

• Work on real-time payment systems at the cutting edge of fintech infrastructure

• Your work directly improves the financial lives of real customers

• Greenfield opportunities to architect new systems alongside legacy modernization challenges

• Small, high-impact team where your contributions are immediately visible

• Solve interesting technical problems at the intersection of payments, ML, and distributed systems