Iyke Williams

Software Engineer| building web apps with C#, JavaScript, & React.js”
learning & sharing web dev. frontend, code tips, tech👨‍💻 Manchester United for life

[Iyke Williams @devIykeh]

I'm iyke (@devIykeh), a Software Engineer| building web application with C#, JavaScript, & React.js
learning & sharing web dev. frontend, code tips, tech👨‍💻
#Tech #frontenddev #javascript #coding #programmer #csharp

[Dhanian 🗯️ @e_opore]

Master System Design without paying for a course.

Full playlist:
https://t.co/IToJPN1HRm

1. System Design Mastery Notebook Roadmap
https://t.co/ZZzFCHRJOp
2. Foundations & the Design Framework
https://t.co/LaF68IspBB

3. Networking & Service Communication
https://t.co/aIWISZ5R5Q

4. Databases & Data Modeling
https://t.co/VqAfQCcl1T

5. Scaling Data: Replication, Partitioning & Sharding
https://t.co/NC5ON4HPaJ

6. Caching, CDNs & Latency
https://t.co/4w2sRIiGKI

7. Load Balancing & Traffic Control
https://t.co/JmeY4gCh8G

8. Async Processing & Event-Driven Design
https://t.co/thpMxsdM0z

9. Distributed Systems Core
https://t.co/isaswL0ksK

10. Reliability, Observability, Security & Architecture Styles
https://t.co/MEkmwwJiC6

11. Case Studies & Deliberate Practice
https://t.co/bNRN93SmQv

How to use it:

→ Watch the videos in order
→ Take notes after every module
→ Practice the concepts immediately
→ After Module 10, design one complete system yourself

Want to go deeper?

System Design Ebook:

Get the ebook: https://t.co/WIMretQFPE

Repost to help another engineer discover this.

Follow @e_opore for more system design, backend engineering, and software architecture content.

Bookmark this thread.

[knowledge hub @knowl_edge01]

Computer parts & terms

[Dhanian 🗯️ @e_opore]

HOW THE JAVA COMPILER FINDS TYPE ERRORS (CLEARLY EXPLAINED IN UNDER 2 MIN)

You write Java code, but before it runs, the Java compiler (javac) checks whether your code follows Java's type system.

The compiler analyzes your variables, expressions, method calls, and assignments to detect type mismatches before execution.

AT COMPILE TIME:

→ The compiler parses your source code and checks whether its syntax follows Java's language rules.

→ It identifies the types of variables, expressions, method parameters, and return values.

→ It checks assignments to ensure that values are compatible with the declared variable types.

→ It verifies method calls to ensure the correct number and types of arguments are provided.

→ It checks whether methods return compatible values and whether objects are used according to their declared types.

→ If it detects an incompatible operation, such as assigning a String to an int variable, it reports a compilation error.

→ The compiler also checks generic type constraints, access rules, and checked exceptions before producing bytecode.

THE RESULT:

Java catches many programming mistakes before runtime, helping developers build safer, more predictable, and maintainable applications.

The key takeaway: The compiler checks types before execution, while the JVM handles runtime behavior.

→ Want to go deeper? Check out this ebook:

Java: The Complete Handbook:
https://t.co/STSI0ZDYpa

[Dhanian 🗯️ @e_opore]

Computer Science Fundamentals Roadmap 2026

Grab Modern Computer Science Course ebook: https://t.co/3CIDuO3sTn

[Iyke Williams @devIykeh]

AI Roadmap

[Dhanian 🗯️ @e_opore]

AI SYSTEM DESIGN ROADMAP
│
├── 1. FOUNDATIONS
│ ├── AI, ML, Deep Learning & Generative AI
│ ├── Mathematics, Statistics & Probability
│ ├── Python, NumPy & Pandas
│ ├── Neural Networks & Transformers
│ └── LLM Fundamentals & Tokenization
│
├── 2. AI MODEL ARCHITECTURE
│ ├── Model Selection & Evaluation
│ ├── LLMs, SLMs & Multimodal Models
│ ├���─ Embedding Models & Rerankers
│ ├── Fine-Tuning, LoRA & PEFT
│ └── Model Serving & Inference
│
├── 3. DATA ENGINEERING
│ ├── Data Collection & Ingestion
│ ├── Data Cleaning & Preprocessing
│ ├── Data Labeling & Governance
│ ├── Feature & Embedding Pipelines
│ └── Data Quality & Versioning
│
├── 4. LLM APPLICATION ARCHITECTURE
│ ├── Prompt Engineering
│ ├── Structured Outputs & Function Calling
│ ├── RAG (Retrieval-Augmented Generation)
│ │ ├── Document Chunking
│ │ ├── Embeddings & Vector Databases
│ │ ├── Hybrid Search & Reranking
│ │ └── Retrieval Evaluation
│ ├── AI Agents & Tool Use
│ ├── Memory & Context Management
│ └── Multi-Agent Systems
│
├── 5. SYSTEM ARCHITECTURE
│ ├── Requirements & Workload Estimation
│ ├── Monoliths, Microservices & Modular Design
│ ├── API Gateway & Model Gateway
│ ├── Synchronous & Asynchronous Processing
│ ├── Message Queues & Event-Driven Systems
│ ├── Caching & Semantic Caching
│ ├── Load Balancing & Autoscaling
│ └── Distributed Systems & Fault Tolerance
│
├── 6. STORAGE & INFRASTRUCTURE
│ ├── SQL & NoSQL Databases
│ ├── Vector Databases
│ ├── Object Storage & Data Lakes
│ ├── GPU / CPU Compute Infrastructure
│ ├── Containers & Kubernetes
│ ├── Cloud Platforms
│ └── Model Serving Infrastructure
│
├── 7. AI EVALUATION & OBSERVABILITY
│ ├── Offline & Online Evaluation
│ ├── Accuracy, Relevance & Groundedness
│ ├── Hallucination Detection
│ ├── LLM-as-a-Judge
│ ├── Tracing & Distributed Logging
│ ├── Latency, Throughput & Token Usage
│ └── A/B Testing & Continuous Evaluation
│
├── 8. SECURITY & GOVERNANCE
│ ├── Authentication & Authorization
│ ├── Prompt Injection Defense
│ ├── Data Privacy & PII Protection
│ ├── Secrets & Key Management
│ ├── Guardrails & Output Validation
│ ├── Model Supply Chain Security
│ └── Responsible AI & Compliance
│
├── 9. PERFORMANCE & COST OPTIMIZATION
│ ├── Quantization & Distillation
│ ├── Batching & Parallel Inference
│ ├── Model Routing & Cascading
│ ├── KV Caching
│ ├── GPU Utilization & Throughput
│ ├── Token Budget Optimization
│ └── Quality–Latency–Cost Trade-offs
│
├── 10. MLOps & LLMOps
│ ├── CI/CD & Model Versioning
│ ├── Automated Testing & Evaluation
│ ├── Model Deployment & Rollbacks
│ ├── Data & Prompt Versioning
│ ├── Drift Detection & Monitoring
│ └─�� Continuous Improvement
│
└── 11. END-TO-END AI SYSTEM DESIGN
├── AI Chatbot / Customer Support
├── RAG-Based Knowledge Assistant
├── AI Coding Assistant
├── AI Search & Recommendation Engine
├── Document Intelligence Platform
├── AI Agent / Workflow Automation
├── Real-Time Voice AI System
├── Multimodal AI Application
├── Large-Scale AI Inference Platform
└── Production-Ready AI SaaS
├── Requirements & Architecture
├── Data & Model Pipeline
├── APIs & Infrastructure
├── Security & Evaluation
├── Scaling & Cost Optimization
└── Reliability & Production Monitoring

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[Dhanian 🗯️ @e_opore]

𝐇𝐨𝐰 𝐭𝐨 𝐂𝐡𝐨𝐨𝐬𝐞 𝐭𝐡𝐞 𝐑𝐢𝐠𝐡𝐭 𝐀𝐏𝐈 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 𝐟𝐨𝐫 𝐘𝐨𝐮𝐫 𝐏𝐫���𝐣𝐞𝐜𝐭?

Grab API Design Handbook: https://t.co/khMNSzijly

[Iyke Williams @devIykeh]

Be honest… which tech stack would you choose for your entire career?

[International Cyber Digest @IntCyberDigest]

‼️ PHP UPDATE: The Dutch parliament, the Dutch national cyber agency and Finland's central government have pulled websites offline ahead of the PHP patch.

Finland's state IT centre Valtori is shutting down public-facing central government web services. The National Land Survey of Finland is already down.

In the Netherlands, the Tweede Kamer, the NCSC and the Dutch Data Protection Authority are offline. So are tech site Tweakers and NotuBiz, which runs council information for 100+ local governments.

The University of Vienna switched off its websites, webmail and Moodle. The University of Freiburg and Finland's Haaga-Helia have taken services down too.

Fur Affinity, Pinboard, explain xkcd and every wiki on Miraheze are dark as well.

Valtori says its shutdown is a precaution, not the result of an attack or breach.

PHP was created by Rasmus Lerdorf in 1994, it initially stood for Personal Home Page

PHP's fix is due at 14:00 UTC today.

[国家サイバー統括室(注意・警戒情報) @cyber_forecast]

PHPのセキュリティチームが、重大な２件の脆弱性に関する注意喚起���行っています。公開しているウェブサイトでPHPを使用しているか確認し、10月21日午後11時（日本時間）に公開される修正パッチについて、可及的速やかに適用できるよう準備をお願いいたします。
https://t.co/TFPc8QIdUN

[Iyke Williams @devIykeh]

@_saylessbr0 Data Analyst
Cyber Security
Artificial intelligence
Software engineer (master one high level programming language)

[Iyke Williams @devIykeh]

@DerasWellness Have a peaceful week

[Nyitera🇺🇬 @meriatisha1557]

Good morning beautiful people.its Monday wake up pray and let's start again with postiv energy.Blessed week.

[Iyke Williams @devIykeh]

@meriatisha1557 Good morning Nyitera

[Nyitera🇺🇬 @meriatisha1557]

Goddd is the only reason l have made it this farrrrr.

[Iyke Williams @devIykeh]

@meriatisha1557 awesome God

[Iyke Williams @devIykeh]

@MercyyyRk1 Go find work

[𝑴𝑬𝑹𝑪𝒀 𝑲𝑨𝑴𝑾𝑰 🗺️ @MercyyyRk1]

Reply im 3 words ,let’s hear it🤗

[Iyke Williams @devIykeh]

@Sue_cree_ Your full potential define who you are.

[Iyke Williams @devIykeh]

@Childofgrace811 True