Take-home coding assignments: a 24–48 hour playbook to ship clean code and a crisp write-up

Take-home tasks are simple on paper and stressful in practice: a vague brief, a short clock, and a reviewer with a pile of submissions. You don’t need wizardry to stand out. You need a routine that turns the brief into a tiny, shippable product, shows clear decisions, and leaves a write-up anyone can scan in five minutes.

The plan below assumes a 24–48 hour window. Adjust the hour marks to your schedule; the order stays the same. You’ll read like an engineer, carve a small walking slice, code with guardrails, and deliver a package that feels usable and thoughtful.

Hour 0–1: read the brief like an engineer

Start by extracting inputs, outputs, and constraints. Rewrite the problem in your own words, list the endpoints or screens you must deliver, and underline any non-functional asks (pagination, auth, rate limits, offline hints, etc.). Write down acceptance checks in plain English (“Can list items; can filter; errors show an actionable message; state is preserved on refresh”). These become your micro-tests.

Next, try to spot unknowns early. If the brief is silent on authentication, data volume, or error cases, write a tiny “assumptions log” at the top of your README and code to it. Reviewers value candidates who surface ambiguity and move forward.

If you like brief visual cues for common patterns, take a thirty-second look at a neutral login layout – for example, desi casino – note where login, reset, and help live, and come back to the task. Treat this purely as a layout reference so you can place forms and links quickly without sinking time into UI bikeshedding.

Finally, draft a scope fence. Decide what you will ship no matter what (the walking slice) and what you will try if time allows (one extension). Write both in the README before you code. A tight fence keeps you from wandering into “nice to have” while the core is still shaky.

Hour 1–6: design small, prove value early

Sketch the walking slice: the thinnest path from input to observable output. On a CRUD task, that’s “create + list with validation”; for a UI brief, it’s “form → success view with state stored and errors shown”. Keep infrastructure light: a single process, a single datastore (even a file or in-memory DB with a swap-in interface), and a single page or endpoint that proves the idea.

Make three decisions up front and document them in one paragraph:

Stack you’ll use and why it fits the brief (e.g., FastAPI + SQLite for speed and a typed surface; React + Vite for quick dev server and small bundle). Data model in three fields (id, core attributes, timestamps).Error model (shape of error responses; where messages appear in UI). Set up the repo with guardrails before writing features: Formatter and linter (Prettier/ESLint, Black/Ruff, etc.). Minimal test harness (one unit test proves the rig works). Makefile or npm scripts for setup, test, run, lint..env.example with the two or three variables you’ll actually need. Create seed data and a fixture to reset state quickly. Reviewers want to clone and see it working in seconds; you want to demo flows without hand-typing rows.

Hour 6–18: build the walking slice

Code in vertical slices: finish one end-to-end path before touching the next. Each slice should compile, run, and pass your plain-English checks. Commit small and write messages that tell a story: “validate title on create”, “list view preserves filters on refresh”, “return 422 with field map”.

A few implementation notes that pay back fast:

Validation first. Fail early with clear messages. In UI, show the message beside the field; in APIs, return a JSON body with a stable shape {error:{field:’title’, message:’Required’}}.

Loading and empty states. Don’t leave blank screens; show a spinner and a one-line empty message with a call to action.

Errors you can act on. “Network error. Retry” beats a generic toast. Add a simple retry button or key across the app.

State and refresh. Keep filters and form values on refresh (URL params or local storage). Reviewers notice this.

Logging and observability. One line per request with method, path, status, and duration. On the client, log to the console only in dev; keep production quiet.

Security hygiene, even in toy tasks, reads well: never trust client input, avoid secrets in the repo, and use a simple CORS and content-security posture that matches your chosen stack. For auth-adjacent briefs, show a mock auth that can be swapped for a real provider – e.g., a stub that issues a signed local token and a middleware that checks it.

When a feature sprawls, cut it. A working create/list with tests beats an ambitious half-built dashboard.

Hour 18–30: polish, measure, and write

With the core walking, spend real time on developer experience and the README. Your reviewer will install a dozen projects this week; make yours the easy one.

README structure that lands:

  • What it is in two sentences.
  • How to run (copy-paste block; no guessing).
  • What to try (three bullet “click paths”: create, list, fail case).
  • Design notes: the trade-offs you made and what you’d do next with one extra day.
  • Tests: how to run them and what they cover.
  • Assumptions: a short list you coded against.

Polish check:

  • Accessibility surface: labels tied to inputs, focus order sane, enter/esc do something helpful, contrast acceptable.
  • Performance sanity: bundle size printed, obvious N+1 avoided, list virtualization for long sets if needed.
  • Screenshots: two or three small images in the README so a recruiter sees the app before cloning.
  • Demo (optional): a short screen capture or a small hosted version if the brief allows – but never at the cost of local setup clarity.

End with tests that matter: one happy path, one validation fail, one error branch. Add a tiny e2e check if the stack makes it easy (Playwright/Cypress). Coverage percentages are less persuasive than tests that reflect your acceptance checks.

Submission package checklist

Repo runs from a clean machine with make setup && make run (or npm i && npm start). Walking slice complete: create + list (or form → result), with validation, loading, empty, and error states. Seed script and fixture; deterministic demo data. Minimal tests pass locally and in CI (GitHub Actions file is a bonus). README with what/why/how, three click paths, trade-offs, next steps, and assumptions. Commit history tells a clear story; no secret keys in history; .env.example provided. Code style consistent (formatter + linter); filenames and functions read like verbs and nouns, not puzzles. Optional demo or screenshots included; local run remains first-class.

Closing notes

Reviewers look for judgement under time pressure. This playbook shows it: you fence scope, ship a thin slice that actually works, and explain choices without fluff. Do it twice and the rhythm sticks. The next brief will still be short and a little vague, but your process won’t be – and that calm shows up in every line they read and every click they try.

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