Full Stack MERN​/PERN Fintech Engineer

Hoyack, LLC is a Texas-based technology company specializing in building modern, scalable software solutions for the fintech and healthcare industries. We partner with startups and growth-stage companies to accelerate product development, streamline financial infrastructure, and deliver exceptional user experiences. Our team thrives on solving complex problems with clean code, thoughtful design, and a deep understanding of regulated environments. At Hoyack, we value curiosity, accountability, and craftsmanship — and we’re building products that make a meaningful impact.

Job Title: Mid-Senior Full Stack Fintech Developer (MERN/PERN + Type Script)

Location: Hybrid – Downtown San Antonio, TX (75% in-office)
Job Type: Full-time
Experience Level: Mid to Senior

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
.

• Design, develop, and maintain full‑stack applications using MERN (Mongo
  
  DB, Express, React, Node.js) and PERN (Postgre
  
  SQL, Express, React, Node.js) stacks
• Build responsive and accessible frontends using React
  , Next.js
  , and Tailwind CSS
• Integrate with payment processors
  , card networks
  , and banking APIs (e.g., ACH, RTP, Fed Now)
• 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

• 4+ years of experience as a full stack developer
• 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

• 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

• Candidates must be available to interview in person in San Antonio, TX
• Remote interviews will not be considered for this position
• Health, dental, and vision insurance
• Unlimited PTO
• Collaborative and mission‑driven work environment
• Walkable office in the heart of Downtown San Antonio