SKS Video Diary
SKS

@sksthecrazyguysoftware engineering

Shubham Kumar

Software Development Engineer at Polyteia

Full-stack and DevOps engineer. I ship Go and TypeScript backends, Next.js frontends and the Kubernetes infra underneath them, I also like talk about what I learned on Instagram.

At Polyteia I do DevOps side (Terraform, Helm, CI/CD across dev, sandbox and production clusters) backend and sometime frontend, I redesigned the SaaS platform on Next.js and Go, moved legacy services from gRPC to JSON-RPC then to oRPC.

Before that I built fintech frontends with Stripe, conversational AI on Dialogflow CX and Gemini, and computer-vision models for PCB defect detection.

GoTypeScriptReact / Next.jsKubernetesTerraformHelmDockerGCPPostgreSQLgRPC / JSON-RPCLLM integrations
InstagramGitHubLinkedInWebsite
years shipping
3+

Video diary

One entry per video: the full idea in text, the animations you saw on screen, and the code. Pick a day on the calendar or browse the list.

September 2026

6 entries

Serverless container or edge function? Same promise, different runtime
Read

Cloud Run ships a whole Docker image into a private room; Cloudflare Workers and Vercel Edge load just your code into a V8 isolate. Runtime, startup, freedom and location follow from that.

serverlessedge-functionscloud-runcloudflare-workersdocker
Ranking backend concepts from intern to senior, part 2
Read

Six more backend concepts on the intern-to-senior tier list, ranked by how much of the system you have to hold in your head before you can make a good call.

backendcareersystem-designtier-list
The thread that makes production debugging possible
Read

A request ID connects one request across services and logs, while traces and correlation IDs reveal timing and longer workflows.

apisobservabilitydebuggingdistributed-systems
Stop using WebSockets for everything
Read

Choose SSE, long polling, or WebSockets based on the direction, frequency, and latency your real-time feature actually needs.

backendwebsocketsserver-sent-eventslong-polling
Ranking backend concepts from intern to senior, part 1
Read

Six backend concepts placed on a tier list from intern to senior, and the reasoning behind each placement: how much of the system you must hold in your head, not how hard the code is.

backendcareersystem-designtier-list
Why durable workflows exist
Read

Sharing a resource with 300 people is a chain of side effects across services. A database transaction can't protect that chain. A durable workflow can.

backendworkflowsinngesttemporal