I treat system design like a checklist.

Here’s my go-to mental TODO list when building systems:

Fundamentals
- What are the read patterns?
- What are the write patterns?
- Who owns the source of truth?
- Is consistency or availability more critical?
- Single writer or multiple writers?

Architecture
- Synchronous or async?
- Do I need a queue, or is a cron job enough?
- Can I separate the compute from storage?
- Stateless or stateful services?
- Contracts versioned?

Reliability
- What happens when this fails?
- Where’s the retry logic, and is it idempotent?
- Are we alerting to symptoms or root causes?
- Timeouts configured?

Scaling
- How do reads scale?
- How do writes scale?
- Will this design hold up at 10x traffic?
- What’s the hot path, and how do we optimize it?

Observability
- Do we log what we need to debug in production?
- Can we trace a request across services?
- What metrics define “healthy”?
- Debuggable without redeploy?

I don’t always follow it linearly, but if something breaks or feels off, this list helps me pinpoint what I may have overlooked.


@et_open_source

Top 37 Git Commands Every DevOps Engineer Must Know

🔹 Daily Workflow (Basics)
1.git clone – Copy repo locally
2.git status – Check repo state
3.git pull – Fetch & merge changes
4.git push – Push commits to remote
5.git add – Stage changes
6.git commit – Save changes

🔹 Branching & Collaboration
7.git branch – List branches
8.git branch <name> – Create branch
9.git checkout <branch> – Switch branch
10.git checkout -b <branch> – Create & switch
11.git switch – Switch branches (modern)
12.git merge – Merge branches
13.git rebase – Reapply commits cleanly

🔹 History & Inspection
14.git log – Commit history
15.git log --oneline --graph – Visual history
16.git diff – Show changes
17.git show – Inspect commit
18.git blame – Who changed what

🔹 Undo & Recovery (Very Important)
19.git reset – Undo commits (local)
20.git reset --hard – Force reset
21.git revert – Safe undo (prod-friendly)
22.git stash – Save uncommitted work
23.git stash pop – Restore stashed work
24.git reflog – Recover lost commits

🔹 Remote & Repo Management
25.git remote -v – View remotes
26.git fetch – Fetch without merge
27.git tag – Create version tag
28.git describe – Version info from tags

🔹 DevOps Power Commands
29.git cherry-pick – Pick specific commit
30.git clean -fd – Remove untracked files
31.git config – Git configuration
32.git shortlog – Commit summary
33.git archive – Create source archive

🔹 CI/CD & Ops Friendly
34.git diff HEAD~1 – Compare last commit
35.git rev-parse HEAD – Get commit hash
36.git show-ref – List refs
37.git worktree – Multiple working trees

Knowing Git deeply = fewer CI/CD failures & faster production fixes.

👉 For more insights, tools, and open-source updates, join our channel here:
🔗 open_source

Do you know? 🐳

Docker → Go

☸️ Kubernetes → Go
🧰 Terraform → Go
📊 Prometheus → Go
📈 Grafana → TypeScript

⚙️ Jenkins → Java
🐍 Ansible → Python
🍳 Chef → Ruby
🎭 Puppet → Ruby

🔍 ELK Stack → Java & Ruby
🧠 Nagios → C
💾 Splunk → C++
☁️ AWS CLI → Python

🔵 Azure CLI → Python
🦊 GitLab → Ruby & Go
🔁 CircleCI → Clojure
🔐 HashiCorp Vault → Go
🚀 ArgoCD → Go
🛡️ Istio → Go

The backbone of DevOps tools is built with Go, Python, Ruby, and Java.
Isn't it time you mastered them? 🚀

👉 For more DevOps insights, tools, and open-source updates, join our channel here:
🔗 open_source

Student ID benefits

> Google Gemini Pro
> Student ID flight booking
> GitHub Student Pack
> GitHub Copilot
> DigitalOcean credits
> AWS Educate
> Google Cloud credits
> Microsoft Azure $100 credits
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> Vercel Pro features
> Netlify enhanced limits
> Railway student discount
> Namecheap free domain + SSL
> Cloudflare Pro
> Postman Student Expert
> Replit Pro
> Cursor Pro
> JetBrains IDEs
> Autodesk
> Figma
> Canva for Education
> Notion
> Grammarly EDU
> Microsoft 365 Education
> LinkedIn Learning
> Coursera financial aid
> edX free course audits
> Udemy free courses
> Pluralsight student plan
> Educative free courses
> Free certification courses
> Spotify Student
> Apple Music Student
> YouTube Premium Student
> Amazon Prime Student
> UNiDAYS discounts
> Student Beans discounts
> Apple Education pricing
> Samsung Student Store
> EarPods free with MacBook (education offer)
> IBM SkillsBuild
> Meta Blueprint certifications
> OpenAI API credits (via student programs)
> Blender (fully free)
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> Sketch student pricing
> Todoist Pro for students
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> Slack Education plan
> Perplexity Pro Student
> Free .me domain (GitHub pack)
> Free SSL certificates
> Linear student plan
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👉 For more DevOps insights, tools, and open-source updates, join our channel here:
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Hiring: Full-Stack Developer (React + n8n)
Remote | Full-Time (Not for students)
Salary: 25,000 – 30,000 (initial, performance-based review)

We’re looking for a Full-Stack Developer with solid experience in React, Supabase (BaaS), and n8n automation to build web apps and real-world automation workflows.

Must have:

- Strong React.js experience
- Supabase or other BaaS
- Hands-on n8n (workflows, triggers, integrations)
- REST APIs, JavaScript / TypeScript, Git
- Ability to work independently (remote)

Bonus:

- Node.js
- Third-party APIs (Stripe, Webhooks, CRMs)
- SaaS or automation experience

What you’ll do:

- Build React frontends
- Implement backend logic with Supabase
- Design & maintain n8n workflows
- Integrate APIs and optimize systems

We offer:

- Fully remote, full-time role
- Real SaaS & automation projects
- Performance-based salary growth
- Long-term collaboration

Apply at:

lumenaddis@gmail.com
Send your CV, GitHub/Portfolio, and a short note on your React, Supabase & n8n experience.

📢 Vacancy: Senior Full Stack Engineer

🏢 Orbit Health (eHealth IT Services PLC) – a digital health company transforming healthcare in Ethiopia and beyond.

🔹 Role: Lead development of scalable web & mobile apps, APIs, and system architecture. Mentor junior engineers.

🔹 Requirements:
• 4+ years full-stack experience
• JavaScript/TypeScript
• React / Vue / Angular
• Node.js / NestJS / Django

📅 Deadline: Jan 22, 2026
📧 Apply: careers@orbithealth.co

✉️ Subject: Senior Full Stack Engineer

10 Most commonly asked topics in system design interviews
(not exact questions, but the ideas every interviewer is testing)

1. Design a URL shortener
Tests basics of scale, hashing, databases, caching, collisions, and tradeoffs.
They want to see how you think, not perfect answers.

2. Design a rate limiter
Very common and very practical.
Shows understanding of distributed systems, consistency, and fairness.

3. Design a cache (or caching layer)
LRU, TTL, write-through vs write-back.
Also tests eviction, memory limits, and cache invalidation thinking.

4. Design a messaging system / queue
Think Kafka, SQS, RabbitMQ style.
Ordering, durability, retries, at-least-once vs exactly-once.

5. Design a notification system
Email, SMS, push.
Fan-out, retries, idempotency, and user preferences.

6. Design a file storage system
Upload, download, metadata, large files.
Chunking, replication, CDN, and consistency tradeoffs.

7. Design a social feed
Timeline generation, fan-out on write vs read.
Hot users, ranking, and caching strategy.

8. Design a logging / metrics system
High write throughput, low latency reads.
Retention, aggregation, and cost awareness.

9. Design a real-time chat system
WebSockets, presence, message ordering.
Delivery guarantees and offline sync.

10. Design an API at scale
Auth, rate limits, pagination, versioning.
Most people fail here because they skip fundamentals.

System design interviews are about reasoning clearly under constraints.

If you understand tradeoffs and can explain them calmly, you already stand out.

https://t.me/et_open_source

እንኳን ለጌታችንና ለመድኃኒታችን ለኢየሱስ ክርስቶስ የጥምቀት በዓል በሰላም አደረሳችሁ።
መልካም  በዓል🙏

🚨 Is Microsoft moving all C/C++ code to Rust by 2030 using AI?

A viral LinkedIn post claimed Microsoft plans to “eliminate every line of C and C++ by 2030 with AI.”
That triggered speculation about rewriting Windows and core products in Rust.

Here’s what’s actually happening 👇

🔹 The post came from Galen Hunt, Microsoft Distinguished Engineer
🔹 It describes research work, not a company-wide mandate
🔹 No official plan to rewrite Windows or all Microsoft products

What the research is about:

• Building AI-assisted tools to help migrate large codebases between languages
• Combining static analysis + algorithms + AI
• Target goal: “1 engineer, 1 month, 1 million lines of code”
• Rust is a demo target due to memory-safety — not a requirement

What this is NOT:
❌ Not a directive to remove all C/C++
❌ Not an AI rewrite of Windows
❌ Not developers being replaced overnight

Why it matters:
This signals a future where:
• AI helps handle boring, risky, large-scale refactors
• Engineers review, validate, and guide the changes
• Long manual rewrites could become tool-driven workflows

📌 Bottom line:
This is experimental tooling research — not Microsoft declaring the end of C/C++.

GSoC 2026 Mentoring org applications now open! 🚀

Inspire tomorrow’s developers with your open source project. Application period January 19 - February 3, 2026.

➡️ Read all the details in our GSoC Blog here:
https://opensource.googleblog.com/2026/01/mentor-org-applications-for-google-summer-of-code-2026-open-through-feb-3.html?m=1

For more info join : et_open_source

Scaling databases gets a lot easier once you learn these 10 techniques:

1. 𝐈𝐧𝐝𝐞𝐱𝐢𝐧𝐠
2. 𝐕𝐞𝐫𝐭𝐢𝐜𝐚𝐥 𝐒𝐜𝐚𝐥𝐢𝐧𝐠
3. 𝐂𝐚𝐜𝐡𝐢𝐧𝐠
4. 𝐒𝐡𝐚𝐫𝐝𝐢𝐧𝐠
5. 𝐑𝐞𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧
6. 𝐐𝐮𝐞𝐫𝐲 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧
7. 𝐂𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐨𝐧 𝐏𝐨𝐨𝐥𝐢𝐧𝐠
8. 𝐕𝐞𝐫𝐭𝐢𝐜𝐚𝐥 𝐏𝐚𝐫𝐭𝐢𝐭𝐢𝐨𝐧𝐢𝐧𝐠
9. 𝐃𝐞𝐧𝐨𝐫𝐦𝐚𝐥𝐢𝐳𝐚𝐭𝐢𝐨𝐧
10. 𝐌𝐚𝐭𝐞𝐫𝐢𝐚𝐥𝐢𝐳𝐞𝐝 𝐕𝐢𝐞𝐰𝐬

What other database scaling technique are you familiar with?


For more join: et_open_source

Senior Full Stack Developer (.NET & React)

We are seeking a high-performing Senior Full Stack Developer with 4+ years of professional experience to design, develop, and scale mission-critical applications. The ideal candidate is a technically strong contributor with hands-on experience in modern web architectures and cloud-native solutions, capable of delivering high-quality, scalable systems.

Key Responsibilities
Architecture & Development: Design, develop, and maintain scalable, high-quality full-stack applications using .NET and React.js.
Cloud Infrastructure: Architect, deploy, and manage robust solutions within the Microsoft Azure ecosystem.
Database Management: Design, optimize, and maintain complex MS SQL Server schemas, queries, and performance strategies.
Cross-functional Collaboration: Work closely with product managers, designers, and fellow engineers to translate business requirements into reliable technical solutions.

Required Qualifications
Experience: Minimum of 4 years of professional software development experience.
Backend Development: Strong expertise in .NET (C#, ASP.NET Core, Web API).
Frontend Development: Proficiency in React.js, including hooks, state management, and modern design patterns.
Database Technologies: Solid experience with MS SQL Server, including T-SQL, indexing, and performance tuning.
Cloud Platforms: Hands-on experience with Microsoft Azure services (App Services, Azure Functions, Azure SQL, etc.).
Communication Skills: Fluent in English (written and verbal).

Preferred Skills
Experience with CI/CD pipelines (Azure DevOps, GitHub Actions).
Familiarity with microservices architecture and Docker/Kubernetes.
Strong understanding of unit testing and a TDD-oriented mindset.

How to Apply:
Interested applicants are invited to submit their CV using the Google Form link provided below.
https://lnkd.in/dsdf24dh

Internship Opportunities – Software Development


We are looking for motivated and skilled interns with a good understanding of modern development technologies and a strong desire to build real-world applications.

Available Positions
Flutter Developer Intern – 2 Positions
React Native Developer Intern – 2 Positions
Full Stack Developer Intern – 2 Position
Internship Duration
Initial period: 3 months
Performance-based extension:
High-performing interns may be selected for an additional 2 months as a paid internship

https://docs.google.com/forms/d/e/1FAIpQLSeJy2OwwnSq7JGg6pT208FPchN1oVI5kYX_La-iNMRO3XDzeg/viewform


https://t.me/et_open_source/

Backend Interview question that is being asked a lot these days :

You are implementing an API that returns users to the client, but the database has 1 M(1000000) users

How will you return data to the client efficiently?



For more info join: et_open_source

Git is easy (actually) once you learn these 20 commands:

1. 𝐠𝐢𝐭 𝐢𝐧𝐢𝐭: Initializes a new Git repository
- Example: git init my-new-project

2. 𝐠𝐢𝐭 𝐜𝐨𝐧𝐟𝐢𝐠: Set git configuration values like username/email
- Example: git config --global user .name "user123"

3. 𝐠𝐢𝐭 𝐜𝐥𝐨𝐧𝐞: Creates a copy of a remote repository
- Example: git clone remote_url

4. 𝐠𝐢𝐭 𝐫𝐞𝐦𝐨𝐭𝐞: Manages connections to remote repositories
- Example: git remote add origin remote_url

5. 𝐠𝐢𝐭 𝐬𝐭𝐚𝐭𝐮𝐬: Shows the current state of your working directory
- Example: git status

6. 𝐠𝐢𝐭 𝐚𝐝𝐝: Adds files to the staging area
- Example: git add file.js

7. 𝐠𝐢𝐭 𝐜𝐨𝐦𝐦𝐢𝐭: Record changes to local repository
- Example: git commit -m "Fix navigation bug"

8. 𝐠𝐢𝐭 𝐩𝐮𝐬𝐡: Uploads local commits to a remote repository
- Example: git push origin main

9. 𝐠𝐢𝐭 𝐩𝐮𝐥𝐥: Fetches and integrates changes from a remote repository
- Example: git pull origin main

10. 𝐠𝐢𝐭 𝐟𝐞𝐭𝐜𝐡: Downloads latest changes from a remote repository without merging
- Example: git fetch origin

11. 𝐠𝐢𝐭 𝐛𝐫𝐚𝐧𝐜𝐡: Lists, creates, or deletes branches
- Example: git branch feature/login

12. 𝐠𝐢𝐭 𝐜𝐡𝐞𝐜𝐤𝐨𝐮𝐭: Switches branches or restores files
- Example: git checkout feature/login

13. 𝐠𝐢𝐭 𝐦𝐞𝐫𝐠𝐞: Combines changes from different branches
- Example: git merge feature/login

14. 𝐠𝐢𝐭 𝐫𝐞𝐛𝐚𝐬𝐞: Reapplies commits on top of another base
- Example: git rebase main

15. 𝐠𝐢𝐭 𝐥𝐨𝐠: Shows commit history
- Example: git log --oneline --graph

16. 𝐠𝐢𝐭 𝐝𝐢𝐟𝐟: Shows differences between commits, branches, etc.
- Example: git diff HEAD~1 HEAD

17. 𝐠𝐢𝐭 𝐬𝐭𝐚𝐬𝐡: Temporarily stores uncommitted changes
- Example: git stash save "WIP: feature implementation"

18. 𝐠𝐢𝐭 𝐫𝐞𝐬𝐞𝐭: Undoes changes by moving HEAD
- Example: git reset --soft HEAD~1

19. 𝐠𝐢𝐭 𝐫𝐞𝐯𝐞𝐫𝐭: Creates a new commit that undoes a change
- Example: git revert abc123f

20. 𝐠𝐢𝐭 𝐜𝐡𝐞𝐫𝐫𝐲-𝐩𝐢𝐜𝐤: Applies specific commit from another branch
- Example: git cherry-pick abc123f

What other git commands would you add to this list?

share to help others in your network

🚀 Are you an African technologist ready to level up your skills?

Applications are now open for the next cohort of the Kubernetes African Developer Training Program 🌍

Get the chance to earn your Kubernetes and Cloud Native Associate (KCNA) certification — 100% FREE!

⚠️ Limited slots available — don’t miss out!
👉 Apply here: form
Join our community: et_open_source

We’re Hiring: Backend Developer

Work Type: Hybrid (1 day onsite per week)
Salary: 30,000 ETB/month

Requirements
1–2 years of professional experience on production applications (excluding academic or demo projects)
Strong proficiency in JavaScript and Python (additional languages are a plus)
Solid hands-on experience in backend development, including building and maintaining robust APIs and services

ONLY GRADUATE. NO STUDENTS ALLOWED

apply using the link below:
👉 https://lnkd.in/dQv32AhY

Continuous learning is the best investment