Full Stack MERN/PERN Fintech Engineer

Hoyack•San Antonio, TX

188d•Hybrid

About The Position

We’re looking for a skilled Full Stack Developer with strong fintech experience to join our team. This role is ideal for someone who enjoys working across the stack, thrives in collaborative environments, and has hands-on experience with card processing and banking rails. You’ll help us build secure, scalable systems that power real-time financial transactions and account services. Note: This is not a remote position. Candidates must be local or willing to relocate, and be able to work on-site in Downtown San Antonio at least 75% of the time.

Requirements

4+ years of experience as a full stack developer
Strong proficiency in JavaScript and TypeScript, including React, Node.js, and Express
Experience building apps with Next.js and styling with Tailwind CSS
Deep understanding of MongoDB and PostgreSQL
Hands-on experience integrating with financial APIs and banking/payment infrastructure
Familiarity with platforms like Plaid, Galileo, Marqeta, Lithic, Synapse, Unit, Modern Treasury, or similar
Experience with KYC/AML, PCI DSS, and secure coding practices
Experience with KYC platforms such as Alloy, Persona, Middesk, or Jumio
Able to work on-site in Downtown San Antonio at least 75% of the time

Nice To Haves

Experience with TypeORM, Mongoose, or similar database abstraction layers
Familiarity with Docker, Kubernetes, and modern CI/CD practices
Knowledge of event-driven architectures, webhooks, and message queues
Prior experience in embedded finance, banking-as-a-service (BaaS), or neobanking platforms
Understanding of SOC 2, GDPR, or other compliance standards

Responsibilities

Design, develop, and maintain full-stack applications using MERN (MongoDB, Express, React, Node.js) and PERN (PostgreSQL, Express, React, Node.js) stacks
Build responsive and accessible frontends using React, Next.js, and Tailwind CSS
Write clean, well-structured, and well-typed code in JavaScript and TypeScript, with a focus on maintainability and scalability
Integrate with payment processors, card networks, and banking APIs (e.g., ACH, RTP, FedNow)
Build and maintain backend services and APIs to support onboarding, KYC/AML, account management, and transaction flows
Collaborate with designers and product managers to build intuitive financial interfaces
Ensure compliance with security, privacy, and regulatory standards in financial systems
Participate in code reviews, technical design sessions, and architecture discussions