Remote JavaScript & Payments API Engineer

Optomi; Charlotte (NC); Hybrid; USD 120,000 - 150,000; Full time

Job summary

Optomi is seeking a payments-focused engineer who will own the documentation lifecycle, investigate vendor APIs, and translate findings into actionable requirements for cross-team delivery. The role emphasizes a strong software engineering foundation, expertise in REST/HTTP, and experience with cloud services (AWS).

The candidate will lead technical investigations, document system behaviors, and shape end-to-end payment experiences with modern serverless architectures, while aligning with

Qualifications

• Strong software engineering background.
• Deep understanding of REST APIs, HTTP semantics and integration patterns.
• Experience with cloud services (AWS preferred).
• Proficient with observability tooling.
• Deep understanding of distributed system behavior.
• Experience in financial services, payments, or banking.
• Familiarity with payment concepts (ACH, wires, real-time payments, settlement, returns).
• Relevant certifications such as AWS Developer Associate or AWS Solutions Architect Associate.
• Has a modern technology stack over a traditional bank stack.
• Experience with serverless architecture patterns.

Responsibilities

• Investigate vendor APIs, platform behaviors, and integration patterns to identify gaps, undocumented constraints, and failure modes.
• Produce clear technical documentation including sequence diagrams, error flow mappings, API inventories, requirements specifications, and decision records.
• Own the documentation lifecycle for assigned workstreams - keeping materials current as understanding evolves and new information surfaces.
• Translate findings into actionable requirements consumable by engineering, product, vendor, and operations teams.
• Maintain traceability from observed behavior and business need through documented requirement and implementation.
• Define current-state and future-state process flows, system interactions, data flows, control points, and exception scenarios for assigned payment experiences.

Skills

REST APIs

HTTP semantics

Integration patterns

Cloud services

AWS

Observability tooling

Distributed systems

Payments domain

Serverless architecture

Modern tech stack

Job description

Optomi is seeking a payments-focused engineer who will own the documentation lifecycle, investigate vendor APIs, and translate findings into actionable requirements for cross-team delivery. The role emphasizes a strong software engineering foundation, expertise in REST/HTTP, and experience with cloud services (AWS).

The candidate will lead technical investigations, document system behaviors, and shape end-to-end payment experiences with modern serverless architectures, while aligning with