SLM Finetuning for Natural Language to Domain Specific Code Generation in Production

Abstract: Many applications today use LLMs for code generation; however, production systems have strict latency requirements that can be difficult to meet with large models. Small LLMs with a few billion parameters are resource efficient but may suffer from limited reasoning, hallucinations, or poor retention of longer context. Fine tuning improves task specific accuracy by embedding domain knowledge directly into model weights, reducing reliance on runtime context. We previously implemented a baseline natural language to code generation approach using a retrieval augmented generation pipeline that dynamically selected few shot examples to embed domain specific language context for a LLM. In this study, we evaluate small LLMs for generating domain specific language from natural language by fine tuning variants of Mistral and other models on a dataset of natural language code pairs. Our results show that the fine-tuned models achieve improved performance and latency on test datasets compared to larger models. We also demonstrate that the trained model can be further fine-tuned for customer specific scenarios without degrading general performance, helping resolve production issues. Load testing followed by production deployment confirmed optimal performance in terms of latency and quality. These findings demonstrate that task specific fine tuning with small LLMs provides an efficient, faster, and cost-effective alternative to LLMs for domain specific language generation.