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Integration & Composition Engineer (Hybrid, 3 days onsite)
Length: 9 month contract (potential extension)
Location: Englewood, CO or West Chester, PA 
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Overview:

We are seeking a Integration & Composition Engineer to design and implement dynamic payload transformations and configuration-driven compositions that enable reliable and scalable system integrations.

This role focuses heavily on payload composition, transformation logic, API integrations, and system-to-system orchestration across internal platforms and external partners. The ideal candidate will have strong hands-on experience with JQ and Go templating and a deep understanding of REST APIs, JSON-based payloads, and high-throughput transaction environments.

 Responsibilities:

• Design and implement integration compositions across APIs, services, and platforms

• Transform, filter, and enrich JSON payloads using JQ

• Build reusable and parameterized templates using Go templating

• Compose dynamic request and response payloads based on business rules

• Develop configuration-driven workflows to support multi-environment deployments (DEV, QA, UAT, PROD)

• Support system-to-system integration, orchestration, and complex data mapping

• Maintain version-controlled, reusable templates and transformation logic

• Integrate third-party platforms with upstream channels and downstream providers

• Implement standardized error handling and decline mapping for consistent transaction outcomes

• Troubleshoot integration failures related to payload structure, mapping logic, or partner systems

• Collaborate with Product, Architecture, QA, DevOps, and Operations teams

• Contribute to documentation, best practices, and reusable integration assets

Required Skills & Experience (Mandatory):

• Strong hands-on expertise with JQ for JSON filtering, mapping, conditionals, and aggregations

• Advanced proficiency with Go templating, including loops, conditionals, and reusable templates (Helm-style experience is a plus)

• Experience integrating REST APIs, working with JSON and HTTP-based services

• Experience supporting system integrations involving API gateways, middleware, or integration platforms

• Experience with at least one programming language: Go, Java, or Python

• Experience working in high-throughput, low-latency transaction systems

• Understanding of payment failure scenarios, declines, and reconciliation impacts

• Strong troubleshooting and debugging skills

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