Senior Full-Stack Integration Engineer - Fintech APIs

Findjobit; United States; Remote; USD 140,000 - 200,000; Full time

Job summary

Findjobit is seeking a senior software engineer to design, build, and maintain integrations across internal and external systems. You will own full stack development (backend and frontend) to support integration needs with minimal dependencies.

Role requires deep RESTful API expertise, CI/CD know-how, and strong Docker/Kubernetes experience. Spanish fluency is required to collaborate with the team, with English as a plus.

Qualifications

• 8+ years of professional software engineering experience.
• Strong hands-on .NET Core / C# backend development.
• Solid frontend experience with React, Next.js, and TypeScript.
• Deep expertise with RESTful APIs, webhooks, OAuth2, JWT, and OpenID Connect.
• Experience with SQL Server, PostgreSQL, and Redis.
• Experience building fintech or payment-related products.
• Hands-on CI/CD pipelines and deployment automation.
• Docker/containerization and basic orchestration.
• Spanish fluency is required; English a plus.

Responsibilities

• Design, build, and maintain scalable integrations between internal and external systems using RESTful APIs and webhooks.
• Develop full stack applications (backend + frontend) to support integration requirements with minimal dependencies.
• Implement CI/CD pipelines and deployment automation using Docker and containerization.
• Ensure integrations meet security standards and performance benchmarks in production.
• Collaborate with product, operations, and engineering teams to translate business needs into technical solutions.
• Mentor teammates through code reviews and drive standards for integration and full stack development.

Skills

Backend development (.NET Core / C#)

Frontend development (React, Next.js,

Tools

Docker

Kubernetes

GitHub Actions

GitLab CI

Azure DevOps

Job description

Findjobit is seeking a senior software engineer to design, build, and maintain integrations across internal and external systems. You will own full stack development (backend and frontend) to support integration needs with minimal dependencies.

Role requires deep RESTful API expertise, CI/CD know-how, and strong Docker/Kubernetes experience. Spanish fluency is required to collaborate with the team, with English as a plus.