How long should a spike be?

Usually 1–3 days, rarely more than a week. It's time-boxed so it doesn't eat your whole sprint. Once the time is up, you report what you learned and move on, even if you didn't finish exploring everything.

What's the difference between a spike and a feature story?

A spike answers a question or reduces risk—its goal is learning. A feature story delivers code to users. You often spike *before* you write a feature story, so you can estimate it better.

Should spike code be committed to production?

No. Spike code is throwaway exploration. It's not production-quality. Once the spike is done, either throw it away or use it only as reference when you build the real feature.

Who decides if we need a spike?

Usually the team, product owner, or tech lead. In backlog refinement or planning, if there's unclear technical risk, someone says 'We should spike this first.' Then you time-box it and assign someone to explore.

No—a spike always succeeds because its goal is learning, not delivery. Even if you discover 'this approach won't work,' that's a success because now the team knows and can try something else.

Is a spike the same as a proof of concept?

Similar but not identical. A spike investigates risk or questions. A PoC goes slightly further—it builds a working prototype to prove something works. Spike is usually faster and lighter.

What is a Spike in Software Development?

Say it like this

✓Let's spike this first to understand the problem

✓I'll do a quick spike on the database migration

✓We should spike the infrastructure cost before committing

✓Can you spike the third-party API integration?

✓This ticket is marked as a spike—time-boxed to Friday

Real examples

Sprint Planning

"We don't know if this payment gateway will work with our system, so let's create a spike to test it before we start the actual feature."

Standup

"Today I'm spiking the performance issue. I'll try three different approaches and report back tomorrow on which one looks promising."

Slack

"Hey, I spent the morning spiking that Kubernetes migration. The learning curve is steep, but it's definitely doable in two sprints."

Jira Ticket

"Spike: Investigate whether we can replace our legacy auth system with OAuth2. Time-boxed: 2 days. Owner: Sarah."

Code Review

"This is exploratory code from my spike—don't merge it, just look at the approach and let me know if it makes sense."

Retro

"The spike on machine learning helped us realize we need a data engineer. It saved us from wasting a sprint on the wrong track."

Interview

"When we faced uncertainty about scaling, we ran a spike to test the architecture under load before committing to the design."

Don't say this

✕We're going to spike the new payment feature next sprint.

✓We're going to spike the payment API integration before building the feature.— A spike investigates a question or risk, not the feature itself. You spike to decide *how* to build it, not to build it.

✕The spike is done, and we have 500 lines of production-ready code.

✓The spike is done. We learned the technology works, so now we can estimate the real feature story.— Spike code is throwaway exploration. It should be short and used only to learn, not as the base for production code.

✕Let's do a spike on building the entire dashboard.

✓Let's do a spike on whether we should use React or Vue for the dashboard.— A spike tackles one specific question or risk, not a whole feature. Keep it focused and time-boxed.

Other forms

noun

spike

"We created a spike to test the new library."

verb (present)

spike

"I'm going to spike the authentication flow today."

verb (past)

spiked

"We spiked the infrastructure question last week."

noun (plural)

spikes

"The backlog has three open spikes blocking the roadmap."

Often used with

time-boxed spikeA spike with a fixed deadline (usually 1–3 days)

technical spikeA spike focused on solving a technical problem or understanding technology

spike storyA Jira/Agile ticket formatted as a spike

spike to investigateCommon phrasing: 'Let's spike to investigate X'

run a spikeTo conduct or execute a spike investigation

spike results / spike findingsThe outcome or learnings from a spike

Similar words

research taskBroader term; spike is specific to tech decisions and uncertainty reduction

proof of concept (PoC)Similar goal (validate an idea), but PoC often produces a working demo; spike is often just exploration

investigationGeneral term; spike is a formal, time-boxed type of investigation used in Agile

explorationBroader; spike is a structured, team-tracked form of exploration with a clear outcome

feasibility studySimilar purpose (determine if something is possible), but spike is shorter and lighter-weight

Opposites

production story / feature storybusiness as usual (BAU)committed workshipping code

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Practice

Try it

4 quick exercises

Which sentence uses 'spike' correctly?

1. Choose the most natural way a team lead would talk about a spike.

We need to spike whether we can migrate to PostgreSQL before we start the migration.Let's finish the spike on the payment integration so we can ship it to production.I'm spiking the entire user dashboard next sprint.

Spot the mistake

2. Which sentence has an error in how 'spike' is used?

This is a spike—we'll spend 2 days figuring out if Kafka fits our needs.The spike code will be merged and used as the foundation for the real feature.After the spike, we'll have a clear answer on whether to use AWS Lambda or containers.

Fill in the blank

3. We need to _____ the database migration strategy before we commit to a timeline.

Rewrite naturally

4. Rewrite this to sound more like a software engineer: 'We will do research on whether the new framework is good for our project.' Use the word 'spike'.

Questions

Quick poll

Have you said "spike" in a standup this week?

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