I'm a Senior Full-Stack Engineer with over 9 years of experience architecting and delivering production-grade SaaS platforms, specializing in React, Supabase, PostgreSQL row-level security, and Stripe Connect payment integrations across multi-tenant environments. I have led backend hardening initiatives, enforced strict tenant isolation, and launched subscription billing systems at scale - most notably during my tenure at Tapcheck, where I helped evolve a fintech platform serving millions of users and over $1 billion in disbursements. I bring both the technical depth to audit and secure AI-generated codebases and the cultural mindset of a collaborative, outcome-driven engineer who is passionate about turning demos into resilient, compliant, revenue-generating products. I’m excited by building robust, compliant systems that scale, collaborating with product, design, and compliance teams, and mentoring peers to grow into independent contributors who deliver measurable business impact.

Joshua Preston

I'm a Senior Full-Stack Engineer with over 9 years of experience architecting and delivering production-grade SaaS platforms, specializing in React, Supabase, PostgreSQL row-level security, and Stripe Connect payment integrations across multi-tenant environments. I have led backend hardening initiatives, enforced strict tenant isolation, and launched subscription billing systems at scale - most notably during my tenure at Tapcheck, where I helped evolve a fintech platform serving millions of users and over $1 billion in disbursements. I bring both the technical depth to audit and secure AI-generated codebases and the cultural mindset of a collaborative, outcome-driven engineer who is passionate about turning demos into resilient, compliant, revenue-generating products. I’m excited by building robust, compliant systems that scale, collaborating with product, design, and compliance teams, and mentoring peers to grow into independent contributors who deliver measurable business impact.

Available to hire

I’m a Senior Full-Stack Engineer with over 9 years of experience architecting and delivering production-grade SaaS platforms, specializing in React, Supabase, PostgreSQL row-level security, and Stripe Connect payment integrations across multi-tenant environments. I have led backend hardening initiatives, enforced strict tenant isolation, and launched subscription billing systems at scale - most notably during my tenure at Tapcheck, where I helped evolve a fintech platform serving millions of users and over $1 billion in disbursements. I bring both the technical depth to audit and secure AI-generated codebases and the cultural mindset of a collaborative, outcome-driven engineer who is passionate about turning demos into resilient, compliant, revenue-generating products.

I’m excited by building robust, compliant systems that scale, collaborating with product, design, and compliance teams, and mentoring peers to grow into independent contributors who deliver measurable business impact.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
See more

Language

English
Fluent

Work Experience

Senior Software Engineer | Tech Lead at Tapcheck Inc
May 1, 2021 - April 1, 2026
Spearheaded the evolution of Tapcheck's Earned Wage Access platform from a growing startup product into a production-grade, multi-tenant SaaS serving over 12,000 employer locations and millions of employees. Architected strict tenant isolation and data integrity across PostgreSQL, implemented row-level security, and performed multi-tenant audits to prevent cross-tenant leakage. Led backend hardening, replacing prototype code with production-grade ASP.NET Core microservices. Implemented Stripe Connect-based payment flows for employer billing, employee fees, and multi-party fund routing; designed the billing lifecycle with metered billing. Built a real-time earned wage calculation engine using AWS Lambda and DynamoDB, integrating data from ~300 HCM systems (ADP, Workday, Paychex). Established observability with Grafana and CloudWatch; introduced SonarQube-gated checks and xUnit tests; set up blue-green CI/CD pipelines using Terraform, Docker, and AWS. Delivered a React employee portal an
Senior Software Engineer at Amalie Oil
October 1, 2017 - April 1, 2021
Modernized Amalie's on-premises digital operations into a cohesive, service-oriented architecture and built a multi-tenant dealer/distributor portal with strict account-level data isolation for partners such as Walmart and AutoZone. Exposed a RESTful API for product catalog, pricing, and order status; integrated Stripe-based payments and webhook-driven reconciliation. Developed a React-based internal operations dashboard, migrated transactional data to a unified schema with performance improvements, and implemented Azure AD SSO with RBAC. Containerized services with Docker and automated deployments via Azure DevOps; added Application Insights for end-to-end tracing, achieving significant performance gains and onboarding efficiency.
Software Engineer II at The Baldwin Group
September 1, 2016 - September 1, 2017
Contributed to an Embedded Insurance platform (multi-tenant SaaS) by building GraphQL and REST endpoints for quotes, binding, and policy management with strict data isolation. Developed React-based white-label front-end components, enabling partner-brand integration. Implemented RESPA-compliant data flows and policy transaction logic; orchestrated insurance lifecycle events using AWS EventBridge and Step Functions; instrumented partner flows with analytics and supported GenAI-based document extraction to accelerate policy issuance for high-volume mortgage partners.

Education

Bachelor of Science in Computer Science at University of Kentucky
April 1, 2014 - August 1, 2016
Associate's Degree in Computer Science at Bluegrass Community and Technical College
April 1, 2010 - March 1, 2012

Qualifications

Add your qualifications or awards here.

Industry Experience

Financial Services, Software & Internet, Manufacturing, Professional Services