I Built a Developer's Second Brain in Notion — Free Template (5 Databases)

Yao Long — Thu, 27 Aug 2026 18:46:58 +0000

As developers, we consume an overwhelming amount of information every day — tutorials, docs, Stack Overflow answers, YouTube videos, code snippets, Reddit threads... But where does all that knowledge go?

Most of it disappears. We read it, maybe bookmark it, and then forget where we put it.

I built Dev Knowledge Hub — a complete developer's second brain in Notion. It's a free template with 5 interconnected databases designed specifically for developers.

What's Inside (Free Version — 5 Databases)

1. Knowledge Base — Your core knowledge management system

Track topics by category (Frontend, Backend, DevOps, Database, AI, Mobile)
Tag with language/tool (JavaScript, Python, Rust, React, Docker, K8s...)
Track mastery level: Learning → Reviewing → Mastered
Link reference URLs and related code snippets

2. Code Snippets — Stop searching for that snippet you saw 3 months ago

Organize by language and category (Algorithm, Utility, Component, Hook, API, Pattern)
Store code with descriptions and source links
Mark favorites for quick access

3. Resources — Curate your learning material

Track articles, videos, courses, books, podcasts, tools
Rate with 1-5 stars
Track reading status: To-Read → Reading → Read → Archived

4. Bookmarks — Tame your chaotic bookmark bar

Categorize: Documentation, Tutorial, Tool, Inspiration, Reference, Repository
Add descriptions so you remember WHY you bookmarked it

5. Quick Notes — Capture ideas before they're gone

Categories: Idea, Question, Bug, Tip, Reminder, Misc
Track status: Active → Resolved → Archived

All 5 Databases Are Interconnected

Knowledge Base links to Code Snippets. Resources link to Knowledge Base. Everything is cross-referenced so you can navigate your entire knowledge graph seamlessly.

How to Use It

Click the link below to open the template
Click "Duplicate" in the top right corner
Start adding your knowledge!

Free Template Link: Dev Knowledge Hub — Free

Want More? Meet the Pro Version

The free version covers the essentials. But if you're serious about leveling up your developer workflow, the Pro version adds 5 more databases for a complete developer productivity system:

Learning Path — Track your learning journeys (e.g., "React Mastery") with start/target dates, progress tracking, and auto-calculated days elapsed/remaining
Projects — Manage side projects and work projects with tech stack tags, priority levels, and linked tasks
Tasks — Break down projects into actionable tasks with priority, estimated time, and type tags
Interview Prep — Prepare for technical interviews with categories (Algorithm, System Design, Behavioral...), difficulty levels, and mastery tracking
Daily Log — Reflect on your daily progress: what you did, what you learned, challenges, blockers, mood tracking, and plans for tomorrow

All Pro databases are interconnected with the free databases — Knowledge Base links to Interview Prep and Learning Path. Projects link to Tasks and Daily Log. It's a complete second brain.

Pro Version ($29): Dev Knowledge Hub — Pro

I built this because I was tired of losing knowledge across dozens of browser tabs, scattered notes apps, and forgotten bookmarks. If it helps you too, I'd love to hear about it!

Drop a comment if you have any questions or suggestions for improvements. 🚀

I built a complete freelance business dashboard in Notion — 7 interconnected databases with rollups and formulas

Yao Long — Thu, 27 Aug 2026 13:45:25 +0000

As a solo developer doing freelance work on the side, I was constantly juggling tools: clients in a spreadsheet, projects in Trello, time tracking in a separate app, invoices in Word docs, and goals... somewhere in my head.

So I built everything into a single Notion workspace. Not just standalone databases — I wanted them to actually talk to each other.

What I built: Freelance OS

7 interconnected databases, each with relation, rollup, and formula properties:

1. Clients

Track status (Lead / Active / Completed / Archived), type, source
Total Revenue auto-calculated via rollup from Projects → Budget
Reverse relations from Projects and Finance

2. Projects

Linked to Clients (bidirectional relation)
Priority, status, budget, estimated hours, progress
Actual Hours auto-calculated via rollup from Time Entries → Duration

3. Finance

Income and expenses linked to specific projects AND clients
Type (Income/Expense), category, currency, payment method, status

4. Time Entries

Linked to Projects (bidirectional)
Billable checkbox toggle
Auto-calculates amount: if(prop("Billable"), prop("Duration (hrs)") * prop("Rate"), 0)
Rolls up into project's Actual Hours

5. Invoices

Issue date, due date, payment status, paid date
Linked to both Clients and Projects

6. Goals

Quarterly targets with deadline and status
Progress auto-calculated: round(prop("Current") / prop("Target") * 100) / 100

7. Tasks

Linked to Projects (bidirectional)
Client auto-pulled via rollup from Project → Client
Priority, tags, due date, estimated time

The relation map

Clients ←──→ Projects ←──→ Tasks
   ↑              ↑
   │              ↓
   │         Time Entries
   ↓              ↓
Finance ←──→ Invoices

Every entry you make ripples across the workspace. Log a time entry → the project's actual hours update → the client page shows the updated project. Record a payment → it's linked to both the project and the client. Add a task → the client name auto-fills from the project relation.

Why Notion instead of separate SaaS tools?

No monthly subscriptions — Notion is free for personal use
100% customizable — every property, view, and formula is yours to change
Single source of truth — no more copy-pasting between 5 apps
Your data stays yours — export anytime

Who it's for

Freelancers, solo founders, consultants, designers, developers, writers — anyone running a one-person business who wants to stop juggling tools.

Pricing

$49 one-time. Not a subscription. You duplicate it into your own Notion workspace and it's yours forever.

After purchase, you'll receive a private link to duplicate the entire template.

Preview the template here: https://app.notion.com/p/Freelance-OS-The-Complete-Solo-Business-Dashboard-3c93b3af224f80f6a593de20161be8b4

Get it here: https://www.creem.io/payment/prod_6rmvfybzKiSLHRk3Yq2GZL

Happy to answer any questions about the setup, formulas, or how I structured the relations!

DEV Community: Yao Long