Senior Software Engineer - 99Pledges

Beacon Software • San Francisco, CA

1d

About The Position

99Pledges is a fundraising technology platform that powers online donation campaigns for organizations, teams, and individuals through our flagship product and through white-label deployments for partners. We process real money at scale, so correctness, reliability, and security are core to everything we build. We're looking for a Senior Software Engineer who thrives in a mature, production Rails codebase, cares deeply about payment integrity, and can own features end-to-end from database schema to background jobs to the user-facing UI.

Requirements

• 3+ years building and maintaining production web applications, with strong Ruby on Rails experience.
• Solid grasp of relational database design, query performance, and safe migrations against large production tables.
• Experience integrating third-party APIs, ideally payment processors, and an appreciation for the failure modes that come with them (retries, idempotency, webhooks, reconciliation).
• A test-first mindset, you write well-tested code and treat correctness and edge cases as first-class concerns.
• Comfort working across the stack, including server-rendered views and front-end interactivity.
• Strong communication skills and the ability to explain technical tradeoffs clearly.

Nice To Haves

• Experience with payment/fintech systems, PCI considerations, or handling money in software.
• Familiarity with multi-tenant / white-label architectures.
• Experience with background job systems and asynchronous processing at scale.
• Exposure to fraud detection or trust & safety systems.
• Experience with feature flagging and A/B experimentation (e.g., PostHog).

Responsibilities

• Core fundraising platform: Campaigns, participants, donations, and the reporting and metrics that fundraisers rely on.
• Payment processing: Integrations with multiple payment providers (credit card, PayPal, and ACH/EFT), including automatic payouts, payment requests, and reconciliation.
• Multi-tenant white-label system: Branding, feature flags, and configuration that let partners run the platform under their own identity.
• Fraud prevention & trust: Fraud detection, device fingerprinting, and abuse mitigation that keep donors and organizations safe.
• Background processing: Reliable email delivery, data exports, and scheduled metric calculations.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed