Lead Python Developer

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.

- 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
- Skills

Must have
- 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
- 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 subsystemsCICS 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 front-end development (preferably React) for building migration dashboards and progress monitoring interfaces
- 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