UST · 4 hours ago
Senior Integration & Composition Engineer
Denver, CO
Full-time
Onsite
Mid, Senior Level
$109K/yr - $164K/yrUST is a mission-driven group that transforms lives through the power of technology. The Senior Integration & Composition Engineer will design and implement dynamic payload transformations and configuration compositions to integrate multiple systems reliably and efficiently.
ConsultingInformation ServicesInformation Technology
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
Qualification
Required
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, HTTP, 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
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
Benefits
Full-time, regular employees accrue a minimum of 10 days of paid vacation per year
Receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year)
10 paid holidays
Eligible for paid bereavement leave and jury duty
Eligible to participate in the Company’s 401(k) Retirement Plan with employer matching
Eligible for medical, dental, and vision insurance
Basic life insurance
Accidental death and disability insurance
Short- and long-term disability benefits
May purchase additional voluntary short-term disability benefits
Participate in a Health Savings Account (HSA)
Flexible Spending Account (FSA) for healthcare, dependent child care, and/or commuting expenses
Company
UST
UST is a Digital Transformations Solutions Provider.
Founded in 1999
10001+ employees
H1B Sponsorship
UST has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (870)
2024 (800)
2023 (647)
2022 (634)
2021 (612)
2020 (984)
Funding
Current Stage
Late StageTotal Funding
$250MKey Investors
Temasek Holdings
2018-06-27Private Equity· $250M
Leadership Team
Krishna Sudheendra
CEO
Alexander Varghese
Chief Administrative Officer & COO
Recent News
Orange County Business Journal
2026-01-24
2026-01-20
Company data provided by crunchbase