Senior Software Engineer - 99Pledges
The posting does not state a salary. This range is our estimate from the role, the location and the stack — treat it as a guide, not an offer.
- Level
- Senior
- Apply from
- United States
Advertised before — reposted once in September 2026 This listing closed and was put back up. It usually means the search has been running a while.
About the role
- Work on core fundraising platform features.
- Integrate with multiple payment providers.
- Focus on fraud prevention and trust systems.
- Handle background processing and email delivery.
- Contribute to a mature Rails codebase.
Skills the posting asks for
- Ruby on Rails
- PostgreSQL
- jQuery
Summarised from the employer’s posting, which is reproduced in full below.
The employer’s full posting
About The Role
99Pledges 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
Required
You'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.
Our Values at Beacon Software
AI does not make hiring decisions: Every application is reviewed by a member of our team, and all decisions throughout the process are made by humans. We use AI to support efficiency and consistency, not to replace human judgment. We are committed to a fair, thoughtful, and equitable experience for every candidate.
99Pledges 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.
- 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
Required
- 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.
- 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).
- 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.
You'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.
Our Values at Beacon Software
- Humility: We acknowledge that the path to getting to the right answer involves being wrong along the way. We have strong beliefs which are weakly held. We actively seek new ideas and believe we can learn from anyone at any time.
- Honesty: We are truth seeking in our approach to business problems. Business is a repeat game and we believe that human relationships generate alpha. We understand that trust is earned over a lifetime and can be lost in an instant.
- Hunger: We play to win. We hold ourselves to high standards and will not be outworked. We take pride in having a deep sense of responsibility to ourselves, each other, our partners, and our customers. We believe to whom much is given much is expected.
- Horizon: We seek to build a generational software company. This will take decades. We manage our expectations and those of our partners to take advantage of the 8th wonder of the world - compounding growth.
AI does not make hiring decisions: Every application is reviewed by a member of our team, and all decisions throughout the process are made by humans. We use AI to support efficiency and consistency, not to replace human judgment. We are committed to a fair, thoughtful, and equitable experience for every candidate.