Senior Developer - Remote Fintech Platform & Impact

ZayZoon; St. Louis (MO); On-site; USD 92,101 - 120,439; Full time

Benefits offered by this job

Remote work

Flexible time off

Benefits from day 1

Parental leave top-up

Earned wage access

Salary data access

Lifelong learning culture

Job summary

ZayZoon is seeking a Senior Developer to own features end-to-end—from back-end architecture to front-end delivery. You’ll design core web and mobile features, ensure robust testing, and ship production‑ready code that scales with our platform.

You will tackle complex engineering challenges around data ingestion, concurrency, and integrations, collaborating with Product, Customer Care, and Finance to deliver reliable software.

Qualifications

• 4+ years hands-on Ruby on Rails in production.
• Strong front-end with React or React Native.
• Solid SQL and data analysis skills.
• Full-stack ownership from backend to tests.

Responsibilities

• Design, build, and maintain core web and mobile features end-to-end.
• Tackle scale, concurrency, data ingestion with data-driven solutions.
• Integrate third-party tools and services to keep platforms reliable.
• Collaborate with Product, Customer Care, and Finance to scope features and resolve issues.
• Mentor teammates and contribute to SDLC practices.
• Use AI to streamline processes.

Skills

Ruby on Rails

JavaScript & React

SQL & data analysis

Full-stack development

Agile methodologies

Scale & concurrency

Code reviews & mentoring

AI tooling

Testing & SDLC

Tools

Git

GitHub

Jira

Job description

ZayZoon is seeking a Senior Developer to own features end-to-end—from back-end architecture to front-end delivery. You’ll design core web and mobile features, ensure robust testing, and ship production‑ready code that scales with our platform.

You will tackle complex engineering challenges around data ingestion, concurrency, and integrations, collaborating with Product, Customer Care, and Finance to deliver reliable software.