Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I’m Jennifer Green, a senior full-stack engineer with nine years building payment infrastructure, third-party integrations, and production web systems. I’ve owned services end-to-end—from schema design and API contracts through deployment, monitoring, and incident response. The bulk of my career has been fintech and payments, so I design for correctness, idempotency, and thoughtful failure modes. The last two years running my own consulting practice sharpened my product-thinking—translating messy business requirements into clean technical designs and making tough trade-offs without committee oversight. I enjoy collaborating across teams, teaching others, and delivering high-impact, maintainable systems.…I’m Jennifer Green, a senior full-stack engineer with nine years building payment infrastructure, third-party integrations, and production web systems. I’ve owned services end-to-end—from schema design and API contracts through deployment, monitoring, and incident response. The bulk of my career has been fintech and payments, so I design for correctness, idempotency, and thoughtful failure modes. The last two years running my own consulting practice sharpened my product-thinking—translating messy business requirements into clean technical designs and making tough trade-offs without committee oversight. I enjoy collaborating across teams, teaching others, and delivering high-impact, maintainable systems.

Jennifer Green

Full Stack Developer, Back-End Developer, Front-End Developer, +2





I’m Jennifer Green, a senior full-stack engineer with nine years building payment infrastructure, third-party integrations, and production web systems. I’ve owned services end-to-end—from schema design and API contracts through deployment, monitoring, and incident response. The bulk of my career has been fintech and payments, so I design for correctness, idempotency, and thoughtful failure modes. The last two years running my own consulting practice sharpened my product-thinking—translating messy business requirements into clean technical designs and making tough trade-offs without committee oversight. I enjoy collaborating across teams, teaching others, and delivering high-impact, maintainable systems.…I’m Jennifer Green, a senior full-stack engineer with nine years building payment infrastructure, third-party integrations, and production web systems. I’ve owned services end-to-end—from schema design and API contracts through deployment, monitoring, and incident response. The bulk of my career has been fintech and payments, so I design for correctness, idempotency, and thoughtful failure modes. The last two years running my own consulting practice sharpened my product-thinking—translating messy business requirements into clean technical designs and making tough trade-offs without committee oversight. I enjoy collaborating across teams, teaching others, and delivering high-impact, maintainable systems.

Available to hire

I’m Jennifer Green, a senior full-stack engineer with nine years building payment infrastructure, third-party integrations, and production web systems. I’ve owned services end-to-end—from schema design and API contracts through deployment, monitoring, and incident response. The bulk of my career has been fintech and payments, so I design for correctness, idempotency, and thoughtful failure modes.

The last two years running my own consulting practice sharpened my product-thinking—translating messy business requirements into clean technical designs and making tough trade-offs without committee oversight. I enjoy collaborating across teams, teaching others, and delivering high-impact, maintainable systems.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Senior Software Engineer at Greens Growth Consulting

May 1, 2023 - Present

Designed and rebuilt the payment flow for a regional property management SaaS as a single async event-driven pipeline in Python; downstream systems subscribe to domain events. Migrated Stripe webhooks to an SQS-backed worker to reduce duplicate charges caused by client retries during slow responses. For a Shopify brand, designed a layered B2B ordering portal with Next.js frontend, Node.js middleware for wholesale pricing and session management, and Shopify draft order API as the backend of record; pricing rules stored in Postgres with a configurable admin UI. Built the B2B portal end-to-end, including an admin panel to manage discount tiers. Optimized server-side rendering decisions, async state management, and API response shapes. Implemented an AI-assisted ticket triage service using Anthropic to classify inbound tickets, cutting first-response time by ~60% and reducing escalations. Integrated AI-assisted coding workflows in 2024 with attention to security-adjacent code and complex b

Senior Software Engineer at Blueciate

June 1, 2021 - April 30, 2023

Designed and owned the integration layer for a commercial real estate workflow platform to decouple deal pipelines and document management from client CRM/ERP systems. Expanded Salesforce integration from basic contact sync to a bidirectional pipeline processing ~40k records nightly with deterministic conflict resolution. Built a webhook ingestion service in Node.js that normalizes events from Salesforce, HubSpot, Yardi, MRI Software, and others into a single internal schema; downstream processing remained agnostic to source systems. Designed integrations as async, queue-backed jobs with retries and dead-letter queues; nightly sync failures dropped from ~8% to under 1%. Contributed to on-call rotations, wrote practical runbooks, and set alerting thresholds based on real failure modes. Mentored two junior engineers, established code-review standards, and translated vague requirements into precise technical contracts with client stakeholders.

Senior Software Engineer at CardConnect

June 1, 2019 - June 30, 2021

Rewrote the transaction search and filtering interface from a server-rendered multi-page flow to a React SPA with client-side filtering and virtualized rendering. Reduced latency significantly and decreased support tickets related to report misreads. Managed state across the merchant portal using server state (React Query) and local UI state. Built the PCI-scoped Django backend dispute management API with endpoints for intake, evidence attachment, status transitions, and submission to card network formats; designed API contracts with frontend and product managers to prevent scope creep. Implemented structured validation at the API layer to ensure evidence completeness per card-network requirements. Owned the end-to-end dispute flow from design through deployment and monitoring, improving chargeback response rates by ~25%. Adhered to PCI-DSS controls and secure coding practices.

Senior Software Engineer at Heartland Payment Systems

August 1, 2018 - June 30, 2019

Worked on the Python SDK and API tooling that ISVs used to embed Heartland’s payment capabilities, focusing on tokenization paths that minimize PCI scope. Refactored the SDK to encourage a safe, straightforward usage pattern and added clear exceptions for incorrect usage. Audited the sandbox against production behavior, documented divergences, and fixed gaps to reduce developer time spent on sandbox issues.

Software Engineer at Constant Processing

September 1, 2016 - August 31, 2018

First engineering role at a small payment facilitator; shipped billing and subscription management features including database schema, backend API, and a React frontend. Gained hands-on understanding of authorization, capture, settlement, and reconciliation. Developed a habit of reading logs carefully to diagnose production failures and debug incidents alongside a senior engineer.