# Neutrinos Bounty Challenge: Cache Smarter, Win Bigger!
**URL:** https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822
**Category:** Announcements
**Created:** [June 9, 2025, 4:17am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822 "2025-06-09T04:17:06Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@Eldho](https://community.neutrinos.com/u/Eldho)
#### Post date: [June 9, 2025, 4:17am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/1 "2025-06-09T04:17:06Z")
Got a sharp mind for systems design and a knack for clever architecture? Join our latest community contest and take a shot at solving a real-world problem in config management — with an Apple iPad up for grabs!
Challenge:
Smart Cache Invalidation for JSON Tree Configs — Design a PoC that implements node-level cache invalidation in a multi-tenant architecture. Think sharp, build smart, and show us your engineering mojo.
Key Dates:
📌 Register by: 10 June 2025
🏁 Submit by: 30 June 2025
🥇 Prize: A brand-new Apple iPad for the best solution!
💡 Bonus points for real-time updates, smart registries, and visualizations.
Let the smartest cache win!
\*\*
> Already a part of the Neutrinos Community? Simply reply to this post to register for the Neutrinos Bounty Challenge!"
\*\*
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### Author:  [@Eldho](https://community.neutrinos.com/u/Eldho)
#### Post date: [June 9, 2025, 4:17am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/2 "2025-06-09T04:17:28Z")
---
### Author:  [@Eldho](https://community.neutrinos.com/u/Eldho)
#### Post date: [June 9, 2025, 4:18am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/3 "2025-06-09T04:18:21Z")
**🧠🔥** **Bounty Challenge: Smart Cache Invalidation for JSON Tree Configs**
**🚨** **The Problem**
In systems where configs are structured as a **JSON tree** , each node (e.g. pricing.rules.discount) acts as an independent unit. Services often depend on specific **nodes or subtrees** , but today’s cache invalidation strategies still treat configs as monoliths — leading to **full cache refreshes** even when only one small config changes.
This leads to:
- 🚫 Cache cold starts across unrelated services
- 🐢 Slower response times post-deployment
- 💸 Wasted infra usage and increased load on config/data layers
* * *
**🎯** **The Challenge**
Build a **Proof of Concept (POC)** that implements **targeted cache invalidation** in services based on **fine-grained, node-level config changes** in a **multi-tenant JSON tree** structure.
* * *
**✅** **Core Requirements**
1. **Fine-Grained Dependency Tracking**
- Services must be able to declare interest in specific config paths (e.g. pricing.rules.discount) or entire subtrees (e.g. pricing.rules.\*).
1. **Targeted Cache Invalidation**
- Only invalidate the portion of the cache directly affected by the config change. All unaffected cached values must remain warm.
1. **Hot Reloading**
- After a config change, services must **automatically update** their local cache or state **without restart**.
1. **Hierarchical Subscription Support**
- Services can subscribe to config **subtrees** so that a change in any child node triggers an update (e.g., ui.labels.language.\* updates if ui.labels.language.en changes).
1. **Multi-Tenant / Namespace Awareness**
- Config changes must be scoped to tenants. A config change for Tenant A should only affect Tenant A’s services — not Tenant B.
* * *
**🌳** **Sample Config Tree**
{
“tenantA”: {
“pricing”: {
“rules”: {
“discount”: 0.1
}
},
“ui”: {
“labels”: {
“language”: {
“en”: { “greeting”: “Hello” },
“es”: { “greeting”: “Hola” }
}
}
}
},
“tenantB”: {
“pricing”: {
“rules”: {
“discount”: 0.2
}
}
}
}
If only tenantB.pricing.rules.discount changes:
- Only **Tenant B services** subscribed to pricing.rules.discount or pricing.rules.\* should invalidate and reload.
* * *
**💡** **Bonus Points**
- Real-time change notification using pub-sub/event stream
- Efficient subscription registry (in-memory or distributed)
- Visualization of dependency maps or cache hit/miss logs
- Support for wildcard path subscriptions (\*.labels.language.en)
* * *
**🛠** **Tech Stack is Yours**
Use Redis, Consul, etcd, Spring Cloud, NestJS, GraphQL subscriptions, or anything else. What matters is your **architecture, efficiency, and clarity**.
---
### Author:  [@Simphiwe](https://community.neutrinos.com/u/Simphiwe)
#### Post date: [June 9, 2025, 5:56am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/4 "2025-06-09T05:56:31Z")
**Hi Eldho,**
**Great competition! 🎉🥳**
Could you please share the link to register?
Thanks!
---
### Author:  [@Eldho](https://community.neutrinos.com/u/Eldho)
#### Post date: [June 9, 2025, 6:02am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/5 "2025-06-09T06:02:20Z")
Hi Smiphive, you don’t need to fill out any forms — just reply to this post saying you’re interested, and you’re good to go!
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### Author:  [@Simphiwe](https://community.neutrinos.com/u/Simphiwe)
#### Post date: [June 9, 2025, 6:06am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/6 "2025-06-09T06:06:02Z")
Okay noted, thanks.
I’m interested
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### Author:  [@Shamnad\_KS](https://community.neutrinos.com/u/Shamnad_KS)
#### Post date: [June 9, 2025, 6:23am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/7 "2025-06-09T06:23:23Z")
Hey, I’m interested. 🙌
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### Author:  [@dhishon](https://community.neutrinos.com/u/dhishon)
#### Post date: [June 9, 2025, 7:29am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/8 "2025-06-09T07:29:07Z")
Hey, I’m interested 👊
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### Author:  [@AdithyaSiva](https://community.neutrinos.com/u/AdithyaSiva)
#### Post date: [June 9, 2025, 2:18pm UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/9 "2025-06-09T14:18:36Z")
looks intresting to me .
i am intrested
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### Author:  [@Utkarsh](https://community.neutrinos.com/u/Utkarsh)
#### Post date: [June 9, 2025, 5:12pm UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/10 "2025-06-09T17:12:04Z")
Hey, I’m interested!
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### Author:  [@Hariharan\_J](https://community.neutrinos.com/u/Hariharan_J)
#### Post date: [June 10, 2025, 9:01am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/11 "2025-06-10T09:01:38Z")
Hey Eldho, I’m interested, add me in.
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### Author:  [@Manikantha\_M](https://community.neutrinos.com/u/Manikantha_M)
#### Post date: [June 10, 2025, 11:36am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/12 "2025-06-10T11:36:55Z")
@Eldho
I am interested. Please add me.
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### Author:  [@ShrinidhiS](https://community.neutrinos.com/u/ShrinidhiS)
#### Post date: [June 10, 2025, 3:39pm UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/13 "2025-06-10T15:39:26Z")
@Eldho I am interested please add me.
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### Author:  [@sonu.suresh](https://community.neutrinos.com/u/sonu.suresh)
#### Post date: [June 10, 2025, 5:18pm UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/14 "2025-06-10T17:18:31Z")
Hey, I’m interested. Lets do this
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### Author:  [@Sumit](https://community.neutrinos.com/u/Sumit)
#### Post date: [June 11, 2025, 6:54am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/15 "2025-06-11T06:54:37Z")
I’m interested to participate
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### Author:  [@\_Karthik\_Kodeer](https://community.neutrinos.com/u/_Karthik_Kodeer)
#### Post date: [June 11, 2025, 7:12am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/16 "2025-06-11T07:12:24Z")
Hey, I’m interested. Please add me
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### Author:  [@Sidharth\_K\_P](https://community.neutrinos.com/u/Sidharth_K_P)
#### Post date: [June 12, 2025, 4:37am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/17 "2025-06-12T04:37:15Z")
Hey, I’m interested. Please add me. 🤸
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### Author:  [@Nitheesh.K.P](https://community.neutrinos.com/u/Nitheesh.K.P)
#### Post date: [June 12, 2025, 4:37am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/18 "2025-06-12T04:37:52Z")
Hi @Eldho
I am interested. Please add me.
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### Author:  [@Richu](https://community.neutrinos.com/u/Richu)
#### Post date: [June 12, 2025, 5:44am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/19 "2025-06-12T05:44:32Z")
I am Interested. Let’s try
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### Author:  [@Gunasekhar\_S](https://community.neutrinos.com/u/Gunasekhar_S)
#### Post date: [June 12, 2025, 5:44am UTC](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822/20 "2025-06-12T05:44:38Z")
Hi @Eldho
Register me please
[Next page](https://community.neutrinos.com/t/neutrinos-bounty-challenge-cache-smarter-win-bigger/822.md?page=2)