The best practice for a SWE to use a local LLM for coding.

Reddit r/LocalLLaMA / 3/30/2026

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Key Points

A .NET/SQL/JavaScript developer is evaluating how to use local LLMs for coding and architecture work, primarily for planning and analysis rather than fully automated code edits.
With limited hardware (RTX 5070 12GB), they experiment with Qwen3.5 (9B and 35B variants) and consider performance constraints for agentic tools and coding workflows.
They test approaches such as running models via llama.cpp with specific flags (e.g., disabling mmap and tuning fit options) to see whether it is fast enough for interactive development.
The core question is whether a “human-in-the-loop” workflow using local LLM assistance is preferable to relying on full automation for code changes.
The author’s motivation includes avoiding subscription costs and maintaining privacy/control when corporate access to hosted tools is uncertain.

I am a .Net developer (also large experience with SQL and JS, studying Python) with 7+ years of experience on a number of projects. I am considering switching to MLOps on the verge of .Net and Python. I don't want to lose my edge and I like coding and architecture.

I have a PC with 5070 Rtx 12Gb so it is kind of limited. I am experimenting with models qwen3.5:9b and qwen3.5:35b-a3b with 32K context for now. Just in case I won't have a corporate access to something like Claude Code or would need a better privacy/for my projects/AI Bubble would collapsed and subscription prices would skyrocket to the Moon.

I've found that my hardware is pretty good for analysis, reviews and planing but may struggle with agentic tools and writing the code (I am still going to test Qwen3.5-35B-A3B with llama.cpp and manual --no-mmap with --fit options and see if it is fast enough).

After a consideration I decided that this is what really need: to enchance my coding with planing and analysis yet to handle all edits on my own - to understand and control all the changes.

Is it a better approach than to relly on a full automatization?

submitted by /u/Feeling_Ad9143
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