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Gabriel Anhaia

Senior Software Engineer @ Monta · 10+ years in backend, distributed systems & AI agents · Creator of Hermes IDE (AI-native terminal) & Neural Playground · Author of 2 books · Open-source enthusiast

Location Berlin, Germany Joined Joined on  Personal website https://xgabriel.com github website

Work

Software Engineer and Book Author

TypeScript strict Mode Is 8 Flags. Turn strictNullChecks On Last.
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TypeScript strict Mode Is 8 Flags. Turn strictNullChecks On Last.

#typescript #tsconfig #migration #types
1
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10 min read
Opaque Types Without `unique symbol`: A Lighter Branded-Types Pattern
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Opaque Types Without `unique symbol`: A Lighter Branded-Types Pattern

#typescript #types #generics #javascript
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8 min read
Function Overloads in 2026: Use a Discriminated Param Instead
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Function Overloads in 2026: Use a Discriminated Param Instead

#typescript #types #javascript #webdev
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8 min read
noPropertyAccessFromIndexSignature: When the Strict Flag Pays Off
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noPropertyAccessFromIndexSignature: When the Strict Flag Pays Off

#typescript #types #tsconfig #javascript
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9 min read
`infer` in Conditional Types: 5 Recipes That Aren't in the Handbook
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`infer` in Conditional Types: 5 Recipes That Aren't in the Handbook

#typescript #types #generics #advanced
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9 min read
Cross-Compiling Go for Alpine vs Distroless: The CGO_ENABLED Decision Tree
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Cross-Compiling Go for Alpine vs Distroless: The CGO_ENABLED Decision Tree

#go #docker #containers #devops
2
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9 min read
Go's net/http Server.Shutdown: The Three-Stage Drain You Probably Skip
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Go's net/http Server.Shutdown: The Three-Stage Drain You Probably Skip

#go #http #backend #deployment
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8 min read
atomic.Pointer[T] for Lock-Free Cache Updates That Don't Race
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atomic.Pointer[T] for Lock-Free Cache Updates That Don't Race

#go #concurrency #performance #atomic
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8 min read
slog Beyond Basics: Group, ReplaceAttr, and Custom Handlers
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slog Beyond Basics: Group, ReplaceAttr, and Custom Handlers

#go #observability #logging #stdlib
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8 min read
unique.Make in Go 1.23: String Interning Without sync.Pool Tricks
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unique.Make in Go 1.23: String Interning Without sync.Pool Tricks

#go #performance #stdlib #memory
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8 min read
Sub-tests Done Right: t.Run, t.Parallel, and the Cleanup-Order Trap
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Sub-tests Done Right: t.Run, t.Parallel, and the Cleanup-Order Trap

#go #testing #concurrency #backend
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7 min read
sync.OnceFunc, OnceValue, OnceValues: When Each Beats sync.Once
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sync.OnceFunc, OnceValue, OnceValues: When Each Beats sync.Once

#go #concurrency #stdlib #backend
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8 min read
Few-Shot Selection at Runtime: Why Static Examples Hurt Edge Cases
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Few-Shot Selection at Runtime: Why Static Examples Hurt Edge Cases

#ai #llm #promptengineering #rag
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8 min read
From Java Records to TypeScript: Three Patterns That Replace Them Cleanly
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From Java Records to TypeScript: Three Patterns That Replace Them Cleanly

#typescript #java #programming #migration
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8 min read
Bun's TypeScript Support in 2026: What Works, What Still Needs tsc
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Bun's TypeScript Support in 2026: What Works, What Still Needs tsc

#typescript #bunjs #runtime #build
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9 min read
PHP Enum Methods to TypeScript: Why Discriminated Unions + namespace Beats class enums
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PHP Enum Methods to TypeScript: Why Discriminated Unions + namespace Beats class enums

#typescript #php #types #migration
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8 min read
`asserts cond` vs `is X`: When the Assertion Function Beats the Type Guard
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`asserts cond` vs `is X`: When the Assertion Function Beats the Type Guard

#typescript #javascript #webdev #tutorial
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8 min read
Multi-Tenant Token Budgets: Quota Patterns That Don't Starve Your Best Customers
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Multi-Tenant Token Budgets: Quota Patterns That Don't Starve Your Best Customers

#ai #llm #observability #saas
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9 min read
Embedding Dimension Reduction: When 1536 256 Doesn't Hurt Recall
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Embedding Dimension Reduction: When 1536 256 Doesn't Hurt Recall

#rag #ai #embeddings #performance
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8 min read
Vector Index Cold Start: Why Your First Query Takes 8 Seconds
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Vector Index Cold Start: Why Your First Query Takes 8 Seconds

#rag #ai #vectordatabase #database
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9 min read
Cost-Aware LLM Routing: Sending 30% of Traffic to a Cheaper Model Without Quality Loss
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Cost-Aware LLM Routing: Sending 30% of Traffic to a Cheaper Model Without Quality Loss

#ai #llm #observability #costoptimization
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10 min read
RAG Chunk Boundary Bugs: Why Your Retriever Returns Half-Sentences
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RAG Chunk Boundary Bugs: Why Your Retriever Returns Half-Sentences

#rag #ai #llm #retrieval
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9 min read
Anthropic Stop Reasons in Production: 5 Cases That Need Different Reactions
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Anthropic Stop Reasons in Production: 5 Cases That Need Different Reactions

#llm #anthropic #agents #python
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8 min read
A Custom http.RoundTripper Is the Cleanest Place for Cross-Cutting HTTP Concerns
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A Custom http.RoundTripper Is the Cleanest Place for Cross-Cutting HTTP Concerns

#go #http #architecture #backend
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8 min read
context.WithoutCancel: When You Need Work That Outlives Its Caller
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context.WithoutCancel: When You Need Work That Outlives Its Caller

#go #concurrency #stdlib #backend
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7 min read
Go's testing/synctest Package: Time-Mocked Tests That Aren't Flaky
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Go's testing/synctest Package: Time-Mocked Tests That Aren't Flaky

#go #testing #concurrency #flaky
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9 min read
Go Race Detector Output: 3 Stack Shapes That Mean Different Things
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Go Race Detector Output: 3 Stack Shapes That Mean Different Things

#go #concurrency #testing #debugging
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9 min read
TypeScript Watch Mode in Big Projects: What --extendedDiagnostics Actually Tells You
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TypeScript Watch Mode in Big Projects: What --extendedDiagnostics Actually Tells You

#typescript #performance #build #monorepo
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9 min read
A Repository Layer in Go Without an ORM: 4 Patterns That Survive in Production
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A Repository Layer in Go Without an ORM: 4 Patterns That Survive in Production

#go #architecture #postgres #backend
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8 min read
The maps Stdlib in Go 1.21+: 8 Functions That Replace Half Your Map Helpers
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The maps Stdlib in Go 1.21+: 8 Functions That Replace Half Your Map Helpers

#go #stdlib #generics #backend
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8 min read
Tool Definition Drift: When Your Agent's Toolset Outgrows Its Prompt
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Tool Definition Drift: When Your Agent's Toolset Outgrows Its Prompt

#ai #llm #agents #promptengineering
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8 min read
Eval Set Sizing: The Statistical Power Math Behind LLM A/B Tests
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Eval Set Sizing: The Statistical Power Math Behind LLM A/B Tests

#ai #observability #machinelearning #statistics
1
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8 min read
Self-Critique Loops for Agents: Where the 3rd Iteration Stops Helping
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Self-Critique Loops for Agents: Where the 3rd Iteration Stops Helping

#ai #agents #llm #promptengineering
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8 min read
Reranker Fine-Tuning on Click Data: When Off-the-Shelf Stops Winning
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Reranker Fine-Tuning on Click Data: When Off-the-Shelf Stops Winning

#rag #ai #machinelearning #search
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8 min read
Agent Trace Sampling: When 100% Capture Stops Being Worth It
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Agent Trace Sampling: When 100% Capture Stops Being Worth It

#ai #observability #opentelemetry #llm
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9 min read
declare global vs declare module: When to Use Which
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declare global vs declare module: When to Use Which

#typescript #types #modules #javascript
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10 min read
Kotlin Coroutines to TypeScript: Three Cancellation Patterns That Aren't 1:1
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Kotlin Coroutines to TypeScript: Three Cancellation Patterns That Aren't 1:1

#typescript #kotlin #async #webdev
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9 min read
Dual ESM/CJS Publish in 2026: A Modern tsconfig + package.json Setup That Just Works
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Dual ESM/CJS Publish in 2026: A Modern tsconfig + package.json Setup That Just Works

#typescript #esm #cjs #javascript
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9 min read
MCP in Production: 5 Patterns That Surface in Real Deployments
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MCP in Production: 5 Patterns That Surface in Real Deployments

#ai #mcp #llm #agents
1
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10 min read
Stateful Agent Replay: Deterministic Reruns From a Captured Trace
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Stateful Agent Replay: Deterministic Reruns From a Captured Trace

#llm #observability #debugging #python
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10 min read
Embeddings on the Edge: sentence-transformers vs Hosted APIs
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Embeddings on the Edge: sentence-transformers vs Hosted APIs

#rag #embeddings #ai #python
1
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8 min read
Building a Plugin System in Go Without `plugin`: 3 Patterns That Actually Ship
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Building a Plugin System in Go Without `plugin`: 3 Patterns That Actually Ship

#go #architecture #webassembly #grpc
1
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7 min read
Stage 3 vs Legacy TypeScript Decorators in a NestJS App
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Stage 3 vs Legacy TypeScript Decorators in a NestJS App

#typescript #nestjs #javascript #decorators
3
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8 min read
Generic-Heavy APIs Hurt Compile Times. Here Is How to Measure It
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Generic-Heavy APIs Hurt Compile Times. Here Is How to Measure It

#go #generics #benchmark
1
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8 min read
Mocking ESM in 2026: Vitest, Bun, and Node's mock.module
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Mocking ESM in 2026: Vitest, Bun, and Node's mock.module

#typescript #javascript #testing #webdev
1
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9 min read
LLM Response Caching: When the 80/20 Hit Rate Saves the Bill
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LLM Response Caching: When the 80/20 Hit Rate Saves the Bill

#ai #llm #python #redis
1
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8 min read
Stop Wrapping Errors in TypeScript. Use `cause` Instead.
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Stop Wrapping Errors in TypeScript. Use `cause` Instead.

#typescript #javascript #node #webdev
1
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7 min read
The 7 Anthropic API Errors That Mean Different Things in Production
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The 7 Anthropic API Errors That Mean Different Things in Production

#anthropic #llm #python #errors
1
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8 min read
Spring Boot to NestJS: A Mental Model for Java Developers
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Spring Boot to NestJS: A Mental Model for Java Developers

#typescript #java #nestjs #backend
1
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8 min read
Go's cmp.Or and cmp.Compare: Three-Way Comparison Without the Boilerplate
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Go's cmp.Or and cmp.Compare: Three-Way Comparison Without the Boilerplate

#go #programming #stdlib #backend
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7 min read
Reading -gcflags='-m=2' Output: What the Go Compiler Tells You About Inlining
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Reading -gcflags='-m=2' Output: What the Go Compiler Tells You About Inlining

#go #performance #compiler
1
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9 min read
iter.Seq in Go 1.23+: The Iterator Type Behind range-over-func
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iter.Seq in Go 1.23+: The Iterator Type Behind range-over-func

#go #programming #backend #tutorial
1
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7 min read
`Awaited<T>`, `ReturnType<T>`, `Parameters<T>`: When You're Reaching for the Wrong One
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`Awaited<T>`, `ReturnType<T>`, `Parameters<T>`: When You're Reaching for the Wrong One

#typescript #javascript #programming #webdev
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9 min read
--isolatedDeclarations: The Build-Time Win for TS Library Authors
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--isolatedDeclarations: The Build-Time Win for TS Library Authors

#typescript #javascript #webdev #performance
1
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9 min read
Tool-Use Latency Budget: Where the 8 Seconds Actually Go
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Tool-Use Latency Budget: Where the 8 Seconds Actually Go

#ai #agents #observability #opentelemetry
1
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7 min read
RAG Evaluation Beyond Recall@K: Faithfulness, Coverage, Robustness
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RAG Evaluation Beyond Recall@K: Faithfulness, Coverage, Robustness

#ai #rag #llm #observability
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9 min read
Stop Using `interface{}` Even in Your Generic Code
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Stop Using `interface{}` Even in Your Generic Code

#go #generics #programming #hottake
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7 min read
Prompt Injection Defense: 6 Patterns That Don't Rely on the Model
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Prompt Injection Defense: 6 Patterns That Don't Rely on the Model

#ai #security #llm #prompt
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7 min read
Bun Test vs Vitest for TypeScript Library Authors in 2026
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Bun Test vs Vitest for TypeScript Library Authors in 2026

#typescript #javascript #testing #webdev
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9 min read
Tagged Template Literals That Type-Check SQL: A 60-Line DSL
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Tagged Template Literals That Type-Check SQL: A 60-Line DSL

#typescript #javascript #programming #tutorial
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8 min read
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