---
title: "Container build cache tools — niche opportunity inside Developer Tools"
url: https://signals.gitdealflow.com/niche-down/developer-tools/container-build-cache-tools
description: "Docker builds in CI are still slow. The remote cache layer is where the speedup hides."
source: VC Deal Flow Signal
---
# Container build cache tools

> Docker builds in CI are still slow. The remote cache layer is where the speedup hides.

**Sector**: [Developer Tools](https://signals.gitdealflow.com/niche-down/developer-tools)  
**Build cost**: Month-long build  
**Deal velocity**: Trickle — one deal per quarter

## Why now

Monorepos and AI-heavy CI have made Docker build times the single biggest CI tax. Caching layers compound — every team that adopts saves real money.

## What the signal looks like

Repos with BuildKit configuration tutorials, distributed cache backends (S3, GCS, R2), and benchmarks showing 5-10x build speedups.

## Public examples

*Public projects + categories only — we never name founders tracked inside the paid product.*

- Depot.dev — managed remote build cache
- Earthly's BuildKit-based cache layer
- Self-hosted BuildKit + S3 cache patterns

## What this displaces

GitHub Actions cache + a Dockerfile and prayers.

## Our build-vs-invest call

Niche but durable. Buyers are platform teams that benchmark CI cost weekly. Hard to displace once installed. Fund if you see a repo gaining stars from named SREs across multiple companies.

## Frequently asked

### How do you make money?

Hosted cache with bandwidth + storage markup. $500-50k/mo per customer.

### Is this competitive with Bazel?

Adjacent. Bazel users have their own cache story. The wedge is the Dockerfile crowd.

### What kills this?

GitHub shipping fast Actions cache or Docker shipping a free hosted cache. Both are possible.

## Canonical

https://signals.gitdealflow.com/niche-down/developer-tools/container-build-cache-tools