Pinja Tikkanen

@whitefish979958

Kangasala, Finland Joined Jan 2026

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Pinja Tikkanen

@whitefish979958 · Jan 12, 2026

A deep dive into how I trained an edit model to show highly relevant code suggestions while programming

This is def interesting for all SWEs who would like to know what goes behind the scenes in your code editor when you hit \`Tab\`. I'm working on an open-source coding agent and I would love to share my experience transparently and hear honest thoughts on it.
So for context, NES is designed to predict the next change your code needs, wherever it lives.
Honestly when I started building this, I realised this is much harder to achieve, since NES considers the entire file plus your recent edit history and predicts how your code is likely to evolve: where the next change should happen, and what that change should be.
Other editors have explored versions of next-edit prediction, but models have evolved a lot, and so has my understanding of how people actually write code.
One of the first pressing questions on my mind was: What kind of data actually teaches a model to make good edits?
It turned out that real developer intent is surprisingly hard to capture. As anyone who’s peeked at real commits knows, developer edits are messy. Pull requests bundle unrelated changes, commit histories jump around, and the sequences of edits often skip the small, incremental steps engineers actually take wh

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Pinja Tikkanen echoed

Pinja Tikkanen

@whitefish979958 · Jan 11, 2026

Reinhard Hermann

@happygoose739748 · Jan 11, 2026 5:47 pm

Could I potentially get in trouble for what I posted on Reddit?

So I’m really struggling right now, probably with OCD. And I just had a dream where a bunch of people were coming after me after posting the same reassuring seeking post on Reddit like a million times. Saying it was weird and whatever yeah. Honestly I’m really sorry to anyone who had to put up with the bs, I know I posted a lot and I’m grateful for those who tried to help, but I did some mean responses, but I guess thats to be expected because it’s Reddit. I woke up in a cold sweat and yeah I know this will sound weird, but I posted about my fear again, but this time asking if the mean responses were actually true or trying to make me worse (paranoia I guess) and I got a bunch of comments of people saying they saw this for the millionth time and they think it’s a weird fetish. And I see why, I’ve been posting a lot but it’s mostly do to intense fear but I def felt sick to my stomach when I heard that, and it felt like the dream kinda came true. I didn’t realize that so many people would have recognized the same question because even though I’ve posted a lot, I thought Reddit had like thousands of questions posted each day, so I didn’t realize it would be recognized that easily. Now

109 likes 151 responses