Python Developer

6 days ago

Belgrade, Central Serbia Luxoft Serbia Full time €60,000 - €80,000 per year

Project Description:

Modernization as a Service (MaaS) is a horizontal practice, supporting all business verticals in the company.

We are looking for a Senior Python Developer who will be able to work with different modernization projects.

Responsibilities:


• 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:

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 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

Languages:

English: B2 Upper Intermediate

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