Senior Integration & Composition Engineer

Senior Integration & Composition Engineer

Who We Are:

Born digital, UST transforms lives through the power of technology. We walk alongside our clients and partners, embedding innovation and agility into everything they do. We help them create transformative experiences and human-centered solutions for a better world.

UST is a mission-driven group of 29,000+ practical problem solvers and creative thinkers in more than 30 countries. Our entrepreneurial teams are empowered to innovate, act nimbly, and create a lasting and sustainable impact for our clients, their customers, and the communities in which we live.

With us, you'll create a boundless impact that transforms your career and the lives of people across the world.

The 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.

• 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 Dev Ops teams to ensure seamless deployments

This position description identifies the responsibilities and tasks typically associated with the performance of the position. Other relevant essential functions may be required.

• 10+ years of experience
• Hands‑on expertise with JQ for JSON filtering, mapping, aggregation, and conditionals
• Strong proficiency with Go templating, including conditionals, loops, and reusable templates (Helm‑style experience is a plus)
• 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 Dev Ops 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 life cycles
  • Knowledge of alternative payment methods, recurring billing, and subscription models
  • Exposure to cloud‑native deployments, CI/CD pipelines, and Kubernetes‑based platforms

Compensation can differ depending on factors including but not limited to the specific office location, role, skill set, education, and level of experience. UST provides a reasonable range of compensation for roles that may be hired in various U.S. markets as set forth below.

Role

Location:

Colorado

Compensation Range: $109,000–$164,000

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, and are eligible for paid bereavement leave and jury duty. They are eligible to participate in the Company's 401(k) Retirement Plan with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance, as well as the following Company‑paid Employee Only benefits: basic life insurance, accidental death and disability insurance, and short‑ and long‑term disability benefits.

Regular employees may purchase additional voluntary short‑term disability benefits, and participate in a Health Savings Account (HSA) as well as a Flexible Spending Account (FSA) for healthcare, dependent child care, and/or commuting expenses as allowable under IRS guidelines. Benefits offerings vary in Puerto Rico.

Part‑time employees receive 6 days of paid sick leave each year (pro‑rated for new…