Engineering Advanced FintechPaymentsLedger

Fintech Engineer

Fintech systems: ledgers, payments, idempotency, reconciliation, risk controls, auditability, and regulatory-aware architecture.

A fintech engineering skill centered on correctness under retries, partial failure, and audit scrutiny. It helps teams design money movement, immutable ledgers, reconciliation workflows, operational controls, and risk-sensitive integration boundaries.

Added Apr 12, 2026

$npx skills add johnefemer/skillfish --skill fintech-engineer

Capabilities Get Started Models & Context Works Great With

What This Skill Can Do

Concrete capabilities you get when you install this skill.

Design payment, wallet, ledger, and settlement flows with correctness first

Model idempotency, reconciliation, reversals, disputes, and retry behavior

Separate processor state, workflow state, and accounting truth cleanly

Define operator controls, approvals, audit logs, and privileged workflows

Integrate payment processors, banks, KYC or fraud systems safely

Identify architectural risk around money movement, security, and compliance-sensitive behavior

Get Started

How to install and use this skill in your preferred environment.

Skills are designed for AI coding agents (Claude Code, Cursor, Windsurf) and IDE-based workflows where the agent can read files, run scripts, and act on your codebase.

Models & Context

Which AI models and context windows work best with this skill.

Recommended Models

Requires careful reasoning; Claude Sonnet or GPT-4o recommended. Financial correctness, retries, and operational controls benefit from stronger models.

Context Window

SKILL.md is concise (~3KB). Fits in 32K context; payment-flow design with external processors and ledgers benefits from 64K+.

Pro tips for best results

1

Be specific

Include numbers — users, budget, RPS — so the skill can size the architecture.

2

Share constraints

Compliance needs, team size, and existing stack all improve the output.

3

Iterate

Start with a high-level design, then ask follow-ups for IaC, cost analysis, or security review.

4

Combine skills

Pair with companion skills below for end-to-end coverage.

Works Great With

These skills complement Fintech Engineer for end-to-end coverage. Install them together for better results.

Stripe Integration Expert

Production-grade Stripe integrations: subscriptions, webhooks, and billing.

StripePayments

Senior Backend

REST APIs, database optimization, authentication, and microservices.

BackendAPIs

API Design Reviewer

REST API linter, breaking change detector, and design scorecard.

APIReview

Postgres Pro

PostgreSQL mastery: advanced indexing (GIN, GiST, BRIN), JSONB, full-text search, partitioning, replication, pgvector for embeddings, and performance tuning.

PostgreSQLpgvector

$ skillfish add johnefemer/skillfish --all # install all skills at once

Ready to try Fintech Engineer?

Install the skill and start getting expert-level guidance in your workflow — any agent, any IDE.