Python Full Stack

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.

Responsibilities:

• We are looking for an experienced Senior Python Developer who can help perform the migration of the client platform:
• • Troubleshoot, debug, and resolve issues in GenAI-powered code translation pipelines
• • 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
• • Implement RAG (Retrieval Augmented Generation) systems using LangChain /Langgraph/LlamaIndex for contextual code understanding
• • Design stateful migration workflows using LangGraph/LangChain/LlamaIndex for complex multi-step transformations
• • Mandatory work from the office 5 days per week

Mandatory Skills Description:

• 
  • 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
• • Async programming patterns for handling concurrent migration tasks
• • Pydantic for robust data validation in migration pipelines
• • Experience with vector embeddings and embedding models
• • 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
• • Orchestrating stateful workflows for complex migration scenarios, managing checkpoints for long-running migrations, implementing conditional routing based on code patterns
• • Building knowledge bases from documentation, implementing hybrid search for code pattern matching, creating custom retrievers for language specific contexts
• • Implementing similarity search and semantic code retrieval systems
• Graph traversal algorithms for dependency analysis
• • Strong problem-solving and debugging skills for identifying translation anomalies and semantic preservation issues
• • Excellent communication skills for collaboration with client teams and explaining complex technical translations

Nice-to-Have Skills Description:

• • Deep understanding of HLASM instruction sets, macro definitions, and DSECT mappings
• • COBOL and PL/I for understanding integrated mainframe systems
• • Assembly language debugging and performance optimization
• • Mainframe utilities (DFSORT, IEBGENER, IDCAMS)
• • Experience with mainframe subsystems: CICS transactions, DB2 stored procedures, JCL batch processing
• • Knowledge of z/OS internals, linkage conventions, and program calling standards
• • Familiarity with EBCDIC to ASCII conversion, packed decimal (COMP-3) handling
• • Experience in Java development, particularly Spring Boot, to understand target architecture requirements
• • Familiarity with large-scale system migrations and modernization efforts, including phased migration strategies and dual-run validation
• • Prior experience working in the banking or financial services industry, understanding core banking concepts, regulatory requirements, and transaction processing
• • Knowledge of performance tuning and optimization in cloud environments, including auto-scaling strategies and cost optimization

Languages:

• English: B2 Upper Intermediate