I help companies turn payments complexity into revenue.

Twenty years in payments, from developer support to sales engineering to product leadership.

Whether it means scoping a solution for an enterprise prospect, shaping a product roadmap, strategic project management, or standing up a new payments offering, I bring the domain expertise and cross-functional instinct to move it forward.

John Simpson
Open to opportunities Solutions Engineering · Product Management · Project Management · Technical Consulting · PreSales, and similar roles where payments expertise and technical depth drive results.
Track Record

Measurable results across roles

Impact spanning solutions engineering, product management, and technical consulting. Each one tied to a business outcome, not a job title.

$5M → $40M ARR growth

Led the technical and commercial strategy for a semi-integrated payment solution adopted by Fortune 500 retailers and QSRs.

60% of company revenue

Owned four payment products serving 2,200+ B2B, SaaS, and B2C clients across the full product lifecycle.

50% faster onboarding

Launched an embedded payments solution that cut underwriting and implementation time in half, adding 100+ new customers in six months.

$12M+ revenue influenced

Delivered 150+ enterprise demonstrations and proofs of concept, contributing to a 15% win-rate increase.

6 weeks → 10 days go-live acceleration

Identified handoff bottlenecks for a growth-stage fintech and streamlined the path from signed deal to live integration.

40% pipeline growth

Designed and deployed an AI-assisted monitoring tool that surfaced high-intent prospects in real time.

Approach

Where technical depth meets business outcome

I have spent my career in the space where technical systems meet business decisions, scoping payment integrations for enterprise prospects, shaping product roadmaps around authorization rates and interchange economics, and assessing startup operations to find the weeks they are leaving on the table.

The demos below are examples of how I think about problems, the kind of artifact I produce in discovery, product evaluation, and technical strategy.

Portfolio

Interactive demos

Each demo is built with AI coding tools and grounded in real payment scenarios. Click to open in your browser. No setup or download required.

Interchange · Visa / Mastercard
InterchangeIQ

Six tools for interchange fee optimization: transaction validation, downgrade simulation, routing comparison, CEDP readiness checking, rate lookup, and agentic commerce risk analysis.

Open demo →
Discovery · Payment Scoping
Solution Scoping Assistant

Walk a merchant through early discovery and build a scoped recommendation covering methods, integration approach, what to watch for, and what to deliberately leave out. Includes a self-running demo mode.

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ACH / RTP / FedNow
US Payment Rails Explorer

Bank-based payment rails across gaming, prediction market, and crypto verticals, with an animated transaction lifecycle.

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Checkout · Identity · Fraud
Checkout & Fraud Explorer

Three simulations showing how checkout, identity verification, and fraud screening fit together in a single commerce flow.

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Agentic Commerce
Agent Trust Dashboard

Monitoring and intervention for autonomous purchasing agents: live activity feed, decision audit trail, anomaly detection, per-agent kill switches.

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Monte Carlo · Optimization
FundraiseAI

Portfolio-level optimization with Monte Carlo scenario simulation for capital campaign planning.

Open demo →
Colleagues & Leaders

What others say

Selected from LinkedIn recommendations spanning a decade of working together.

“
He has a unique skill set of being highly technical but also business and solution focused. I’ve seen John grow professionally and personally over the past decade and strongly recommend him.
Joe Mach CEO North America · Managed John directly
“
John has a real knack for moving the ball forward. He brings a sense of urgency to every project and keeps client needs front and center. I watched him navigate a fast-moving startup environment and then adapt seamlessly as the company scaled.
James Harbert Solution Engineer, Payments · 7+ years together
“
He consistently executes with a collected demeanor. He is dependable, thorough, and able to communicate effectively. I would highly recommend him for any business analysis, project management, product management, or sales engineering role.
Tony Lucento Executive Director, Payments Product Strategy
“
Great engineering, project, and product management experience. He always puts the client first, and executes business priorities very well even when the decision is tough to make. He’s also a fantastic colleague and always supports his team.
Jason Curtis Payments Executive Director, Product & Strategy

Connect with Me

LinkedIn GitHub