Fullstack Python Developer (Django + JS)

Project Description:

We have an ambitious goal to migrate a legacy system written in HLASM (High-Level Assembler) from the mainframe to a cloud-based Java environment for one of the largest banks in the USA.





We are looking for an experienced Senior Python Developer who can help perform the migration of the client platform:

• Collaborate with dev and client teams to ensure alignment with project goals and deliver high-quality solutions

• Maintain and fine-tune RAG application that supports the migration process, specifically optimizing LLM prompts for pattern recognition

• Build and maintain FastAPI-based microservices that orchestrate the migration workflow

• Mandatory work from the office 5 days per week



Experience in front-end development (preferably React) for building migration dashboards and progress monitoring interfaces (2+ years)

• Proficiency in Python development (5+ years), with specific expertise in:

• FastAPI for building high-performance REST APIs and WebSocket connections

• Pydantic for robust data validation in migration pipelines

• Vector database implementation for semantic search

• Graph database experience for code dependency mapping

• Building agents for code analysis, implementing custom tools for mainframe-specific transformations, creating chains for multi-step code migration

• Building knowledge bases from documentation, implementing hybrid search for code pattern matching, creating custom retrievers for language specific contexts

• Graph traversal algorithms for dependency analysis

• COBOL and PL/I for understanding integrated mainframe systems

• Assembly language debugging and performance optimization

• Mainframe utilities (DFSORT, IEBGENER, IDCAMS)

• Experience with mainframe subsystems: Experience in Java development, particularly Spring Boot, to understand target architecture requirements

• Knowledge of performance tuning and optimization in cloud environments, including auto-scaling strategies and cost optimization



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