Senior Python Full-Stack Developer (Python+React)

Job Description

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 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