Efrain Castillo

FP&A | Financial Analysis | Finance Analytics

Finance professional with 8+ years across FP&A, accounting, and analytics in fintech, SaaS, marketplace, and foundation environments.

At Jaris, I owned quarterly and annual forecasts for a $50M+ fintech loan portfolio. My background combines driver-based forecasting and business partnership with public-company accounting, reconciliation, and controls experience.

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Work

Selected Finance Case Studies

Summaries of selected finance analysis. Completed case studies have HTML write-ups, with PDFs and supporting repositories linked when they are public.

Corporate FP&A

Corporate FP&A Operating Case

A corporate FP&A case covering revenue drivers, workforce planning, departmental Opex, annual planning, budget vs. actuals, rolling reforecasting, risks and opportunities, and executive commentary.

Coming Soon

GTM / Marketing Finance

Marketing Investment Economics

Self-directed portfolio project using synthetic data. Evaluated channel acquisition efficiency, contribution-margin payback, and downside sensitivity to identify where incremental marketing tests deserve attention.

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SaaS economics

SaaS Growth Economics

Self-directed portfolio case using synthetic subscription data. Analysis of ARR and MRR growth, ARR bridge, retention, NRR, GRR, churn, CAC, LTV, payback, cohort behavior, contribution economics, and management reporting.

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Revenue forecasting

Merchant Revenue Forecasting

Self-directed portfolio project using synthetic data. A planning framework for choosing a 12-month merchant-revenue forecast method and managing merchant-level exceptions.

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Services

Monthly FP&A & Management Reporting

Decision-ready financial visibility for growing businesses that need stronger planning and reporting without building a full internal FP&A function.

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Core deliverables

  • Monthly budget vs. actual analysis
  • Rolling forecast and revised outlook
  • Cash and runway visibility
  • Revenue and operating KPI reporting
  • Variance commentary and driver analysis
  • Risks and opportunities summary
  • Management-ready financial reporting

The goal is to turn accounting and operating data into a recurring management view of what happened, why it happened, what is changing in the outlook, and where management may need to act.

Best suited for growing SaaS, services, fintech, marketplace, and other operating businesses that have financial data but need a more structured forecasting and management-reporting cadence.

About

About

I connect operating drivers to financial decisions and make sure the underlying data can be trusted. My experience includes $50M+ portfolio forecasting at Jaris, IPO and SEC reporting support at Poshmark, CapEx analysis and systems work at Egnyte, and current contract accounting and controls work through DeWinter Group at the William and Flora Hewlett Foundation.

Read my professional background

Contact

Contact

For roles or independent FP&A / finance analytics work, use the links below.