Renaldi Purwanto – Medium

Renaldi Purwanto

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Renaldi Purwanto

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13h ago

I Built a Dead Letter Queue in Go After Retry Was Not Enough

Retry helped for temporary failures, but it became dangerous when broken messages kept returning to the worker like nothing had happened.

I Built a Dead Letter Queue in Go After Retry Was Not Enough

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Level Up Coding

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Renaldi Purwanto

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1d ago

I Added Request Size Limits to My Go API After One Payload Hurt the Service

The endpoint was designed for normal JSON requests, but production reminded me that not every client sends normal payloads.

I Added Request Size Limits to My Go API After One Payload Hurt the Service

Renaldi Purwanto

·

2d ago

AI Wrote My Go Code, But Production Taught Me the Real Lesson

The code compiled, the feature worked in staging, but production exposed every shortcut I ignored.

AI Wrote My Go Code, But Production Taught Me the Real Lesson

Renaldi Purwanto

·

3d ago

Logs Were Not Enough: How I Added Observability to a Go Microservice

A practical backend story about debugging a slow Go service with structured logs, metrics, pprof, request IDs, and tracing mindset.

Logs Were Not Enough: How I Added Observability to a Go Microservice

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Level Up Coding

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Renaldi Purwanto

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5d ago

I Upgraded a Production Go Service to Go 1.26: Here Is What Changed

A practical story about upgrading a real Go microservice.

I Upgraded a Production Go Service to Go 1.26: Here Is What Changed

In

Stackademic

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Renaldi Purwanto

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5d ago

I Overengineered My Go Project So You Do Not Have To

How I simplified my Go project without losing maintainability.

I Overengineered My Go Project So You Do Not Have To

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Stackademic

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Renaldi Purwanto

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Jul 2

The Goroutine Leak That Slowly Killed My Go Service

Backend story about Go concurrency, context cancellation, pprof, worker pools, and the small goroutine mistake that became a production…

The Goroutine Leak That Slowly Killed My Go Service

In

Level Up Coding

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Renaldi Purwanto

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Jun 29

testing/synctest Just Made Concurrent Go Tests Reliable. Here Is What That Means in Practice.

How the package that graduated to standard in Go 1.25 solves the hardest problem in testing concurrent code: time.

testing/synctest Just Made Concurrent Go Tests Reliable. Here Is What That Means in Practice.

In

Level Up Coding

by

Renaldi Purwanto

·

Jun 26

5 Context Mistakes That Are Quietly Breaking Your Go Backend

A practical guide to the context propagation bugs that slip through code review, based on real production incidents.

5 Context Mistakes That Are Quietly Breaking Your Go Backend

In

Stackademic

by

Renaldi Purwanto

·

Jun 25

Go 1.23’s range-over-func Is the Most Underrated Feature of the Last Two Years

A practical guide to custom iterators for backend developers, with real patterns for pagination, database rows, and streaming responses.

Go 1.23’s range-over-func Is the Most Underrated Feature of the Last Two Years

Renaldi Purwanto

Renaldi Purwanto

he

Software Engineer | Golang Enthusiast | Passionate about scalable systems, APIs, and backend solutions.

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