About the Role99Pledges 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.
About the Role What You'll Work On- 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.
Tech Stack- Backend: Ruby on Rails 7, Ruby 3.1
- Database: PostgreSQL (production), with careful attention to migrations and denormalized/calculated fields for performance
- Frontend: HAML, SCSS, Bootstrap, jQuery
- Background jobs: Delayed Job (Active Record backend)
- Payments: Braintree, PayPal, Dwolla
- Infrastructure: Heroku, AWS S3, Redis
- Email: Postmark
- Monitoring: Honeybadger (errors), New Relic (performance), Datadog (migrating to)
- Analytics/experimentation: PostHog
What We're Looking ForRequired- 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 Have- 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).
How We Work- We review designs before writing code and favor explicit, well-engineered solutions over clever ones.
- We prefer DRY code, thorough testing, and small, reviewable changes.
- We take production seriously: careful migrations, monitoring, and a bias toward correctness - because we handle donations that matter to real people and organizations.
Why Join UsYou'll work on software that helps organizations raise money for causes they care about, with a small team where your work has direct, visible impact on both the product and the people who depend on it.
