Python Full Stack Developer - Lift & Shift Migration

UST is searching for a Python Full Stack Developer to join our Cloud Platform Engineering team, supporting the migration of on-premises batch processing systems to AWS. This role goes beyond a pure lift-and-shift - it involves refactoring legacy batch jobs, many currently written in PERL, into modern, cloud-native Python applications and services.

The opportunity:

• Refactor and migrate legacy on-premises batch processing jobs, including existing PERL scripts, into Python-based services on AWS

• Design, build, and maintain full stack applications (Python backend, web front end) to support batch job monitoring and operations

• Re-architect batch workflows to run on AWS-native services (e.g., AWS Batch, Lambda, Step Functions) as appropriate

• Analyze existing PERL scripts and on-prem batch logic to identify functionality, dependencies, and edge cases prior to refactoring

• Write automated tests to validate that refactored jobs produce equivalent results to the legacy systems

• Collaborate with cloud engineers on infrastructure, deployment pipelines, and cutover sequencing for migrated workloads

• Troubleshoot and resolve data or processing discrepancies surfaced during migration validation

• Document refactored logic, architecture decisions, and operational runbooks

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

• (Must Have) Python Development

• Strong hands-on experience building production applications and scripts in Python

• Experience with batch/ETL processing patterns - scheduling, error handling, retries, idempotency

• Comfortable working with Python data processing libraries and writing automated tests Full Stack Development

• Experience building both backend services and front-end interfaces (e.g., React, Vue, or similar)

• Experience designing and consuming REST APIs

• Comfortable owning a feature end-to-end, from data layer to UI PERL Scripting

• Able to read, understand, and refactor existing PERL scripts

• Experience translating PERL-based batch logic into equivalent, maintainable Python code Lift & Shift / Refactoring Migration Experience

• Has been a core contributor to a migration project involving refactoring - not just re-hosting - legacy code

• Experience with batch job migration, including validation and parallel-run/cutover strategies

• Comfortable working with legacy, undocumented code and reverse-engineering business logic

• Preferred Qualifications (Nice to Have)

• These skills will strengthen a candidate’s profile but are not a hard requirement. AWS & Cloud

• Experience with AWS Batch, Lambda, or Step Functions

• Familiarity with Docker and containerized batch job deployment

• AWS Certified Developer - Associate Additional Experience

• Experience with SQL and relational or NoSQL data stores (RDS, DynamoDB)

• Familiarity with CI/CD pipelines (CodePipeline, CodeBuild, or GitHub Actions) Core Technology Stack Area Technologies Migration Scope On-premises to AWS lift-and-shift migration with refactoring of batch processing workloads Primary Language Python (Must) - application development, batch/ETL scripting Legacy Scripting PERL (Must) - reading, refactoring, and migrating existing scripts Full Stack Backend (Python) + Frontend (JavaScript/React or similar), REST APIs Batch Processing AWS Batch, Lambda, Step Functions, EventBridge, scheduled jobs Data & Storage S3, RDS, DynamoDB CI/CD CodePipeline, CodeBuild, GitHub Containers Docker

3.73.7 out of 5 stars Chicago, IL Remote $82,000 - $123,000 a year, Pulled from the full job description

• Health insurance
• 401(k) matching
• Vision insurance
• Health savings account
• Dental insurance
• Paid sick time
• Paid jury duty, 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 hires throughout the year) and are eligible to participate in the Company’s 401(k) Retirement Plan with employer matching.

Full-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year) and are eligible to participate in the Company’s 401(k) program with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance.

Part-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year).

All US employees who work in a state or locality with more generous paid sick leave benefits than specified here will receive the benefit of those sick leave laws., Compensation range: $82,000.00 to $123,000.00 per year

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., We proudly embrace the values that have shaped UST since day one. We build our culture of Humility, Humanity, and Integrity. These values inspire us to nurture a people-first, human centric culture that fosters diversity, prioritizes sustainable solutions, and keeps our people and clients at the forefront of all decisions., UST is a global digital transformation solutions provider. For more than 20 years, UST has worked side by side with the world’s best companies to make a real impact through transformation. Powered by technology, inspired by people and led by purpose, UST partners with their clients from design to operation. With deep domain expertise and a future-proof philosophy, UST embeds innovation and agility into their clients’ organizations. With over 30,000 employees in 30 countries, UST builds for boundless impact-touching billions of lives in the process.