Senior Integration & Composition Engineer

Client Job Title: Senior Integration & Composition Engineer
Location Denver/Englewood, CO OR West Chester, PA (3 Days Onsite)
Duration: 6-12+ Months Contract

Mandatory Skills JQ, Go Template, REST API, JSON

Preferred Skills (Preferred Experience) Python, GO Language, Java, CI/CD



Mandatory Skills
JQ, Go Template, REST API, JSON



Preferred Skills (Preferred Experience)
Python, GO Language, Java, CI/CD



Job Description


Senior Integration & Composition Engineer to design and implement dynamic payload transformations and configuration compositions to integrate multiple systems reliably and efficiently. This role focuses on payload composition, transformation, and system integration across internal systems and external partners. The engineer will use JQ and Go templates to implement dynamic request/response mappings, configuration-driven workflows, and environment-specific integrations while ensuring scalability, resiliency, and compliance.



Key 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 requests/responses for downstream systems based on business rules
Support system-to-system integration, orchestration, and data mapping
Troubleshoot integration issues related to payload structure and transformations
Collaborate with platform, API, and DevOps teams to ensure seamless deployments
Maintain versioned, reusable templates and transformation logic
Build Go template-driven configurations to support reusable, parameterized integrations across environments (DEV, QA, UAT, PROD)
Integrate 3rd party platforms with upstream channels and downstream providers
Implement standardized error handling and decline mapping to ensure consistent customer and operational experiences
Partner with product, architecture, QA, and operations teams to ensure payment integrations meet business, regulatory, and performance requirements
Troubleshoot production issues related to payment composition logic, payload mismatches, or partner integration failures
Contribute to documentation, best practices, and reusable integration assets



Required Skills & Experience
Hands-on expertise with JQ for JSON filtering, mapping, aggregation, conditionals
Strong proficiency with Go templating, including conditionals, loops, and reusable templates (Helm-style experience is a plus) & payload generation
Integration & APIs - Experience integrating REST-based payment APIs and event-driven flows. REST APIs, JSON, API gateways, middleware, or integration platforms
Experience in programming and scripting languages such as GO/Java/Python
Understanding of payment failure scenarios, declines, and reconciliation impacts
Experience supporting high-throughput, low-latency transaction systems
Knowledge in DevOps such as Kubernetes, Helm, CI/CD Pipeline
Familiarity with orchestration frameworks
Strong debugging and problem-solving skills



Preferred / Nice-to-Have
Prior experience with payment platforms and end-to-end payment lifecycles
Knowledge of alternative payment methods, recurring billing, and subscription models
Exposure to cloud-native deployments, CI/CD pipelines, and Kubernetes-based platforms