API-Driven Software Engineer — Customer Integrations

Guarantors Technology Service Inc; New York (NY); Hybrid; USD 125,000 - 145,000; Full time

Benefits offered by this job

Health savings account

Generous PTO

401(k)

Paid parental leave

Disability insurance

Flexible spending accounts

Job summary

TheGuarantors is seeking a Software Engineer - Customer Integrations (API) to help build and maintain a scalable microservices platform in a hybrid NYC setting. You will own backend work powering client integrations and collaborate across teams to deliver robust features.

The ideal candidate will bring technical expertise, work with engineering leaders on impactful features, and contribute end‑to‑end projects in a fast‑growing fintech environment.

Qualifications

• 2+ years of building backend services with common languages.
• Exceptional interpersonal skills.
• Solid understanding of API concepts and designs.
• Understanding of SQL and relational databases.
• Familiarity with modern web infrastructure components and how to manage them.
• Understanding of system design, data structures, and algorithms, with ability to evaluate design documents.
• Experience with cloud providers and IaC tooling such as Terraform.

Responsibilities

• Build and maintain highly scalable backend services and APIs that power developer‑facing platform capabilities.
• Develop secure, well‑documented, versioned APIs with a strong emphasis on developer experience, consistency and usability.
• Work on projects from planning to delivery independently.
• Partner with Engineering leaders on ideation and implementation.
• Collaborate across multiple tech teams to develop impactful features.

Skills

Go

Java

Python

C#

API design

SQL

Cloud platforms

Terraform

Tools

Terraform

AWS

Azure

GCP

Job description

TheGuarantors is seeking a Software Engineer - Customer Integrations (API) to help build and maintain a scalable microservices platform in a hybrid NYC setting. You will own backend work powering client integrations and collaborate across teams to deliver robust features.

The ideal candidate will bring technical expertise, work with engineering leaders on impactful features, and contribute end‑to‑end projects in a fast‑growing fintech environment.