Gemini for Developers: Essentials — Refactoring & Migration Playbook

A focused playbook for safe refactoring and migration with Gemini. Learners pin down what legacy code must keep doing, rename and extract functions in small behaviour-preserving steps, then move off deprecated Python date helpers without breaking the nightly job. They leave with a step-by-step refactor plan and the habit of checking what the tests do not cover. About 45 minutes including the final.

What this course covers

The course runs across 3 topics, each one a short adaptive session rather than a recorded lecture. The tutor explains the idea, works an example, checks understanding, and adjusts the next step to the answer given.

Invariants and the tests you actually have — Before changing anything, learners ask Gemini to list what the code must keep doing (exact reminder text, order, the 24-hour window, the names callers import) and compare that list with what the tests really cover. They find paths, such as the default 'now', that no test runs.
Small, behaviour-preserving refactors — Learners ask Gemini for a plan of small steps - extract a helper, remove copy-paste, rename - with the tests green after each one and old public names still working. They review each step as a change to check, not a full rewrite to accept.
Migrating off deprecated APIs without surprises — Learners weigh a teammate's 'just swap utcnow()' suggestion against what the code compares the time with, and see how mixing naive and timezone-aware datetimes breaks only the path the tests skip. They plan the migration, the test that would catch the problem, and a rollback.

Skills you build

Results are measured against named skills in the OneRange taxonomy of more than 10,000 skills, so a manager sees proficiency per skill rather than a completion tick.

Who it is for

Software developers. The material is pitched at beginner level, and takes roughly 45 minutes at a typical pace. Because every session adapts, someone who already knows a topic moves through it quickly instead of sitting through an explanation they do not need.

It sits in the Tool: Gemini track of the Vero AI Catalog, and can be assigned to one person, a team, or the whole company.

How it is delivered and assessed

Delivery is conversational and interactive, including code lab, branching scenario exercises. There is no video to sit through and no slide deck to click past.

Understanding is checked with a lab assessment of 5 items, with a pass mark of 70%.

Administrators can copy this course into their own library and adapt it — edit the outline, change the duration, swap the assessment format, or ground it in internal documentation so answers cite the company's own source material.

Also in this track

All Gemini training courses →
Gemini: Essentials — Data & Analysis Playbook — A focused playbook for doing data and analysis work in Gemini. Learners run real tasks end to end - data cleanup, analysis, charts, and interpretation - and leave with repeatable workflows they can use the same day. About 45 minutes including the final.
Gemini: Essentials — Everyday Work — This course applies Gemini to everyday knowledge work: email, documents, meeting prep, and quick research. Learners practice each workflow directly in Gemini and leave with daily habits, not just features.
Gemini: Intro — An absolute-baseline introduction to Google Gemini for first-time users. Learners see what Gemini is, how to open it (including inside Google Workspace), and how to send their first prompt. It gets total beginners started in minutes. About 30 minutes including the final.
Gemini: Essentials — Coding Playbook — A focused playbook for doing coding work in Gemini. Learners run real tasks end to end - code generation, explanation, debugging, and review - and leave with repeatable workflows they can use the same day. About 45 minutes including the final.
Gemini for Developers: Essentials — Testing Playbook — A focused playbook for testing with Gemini. Learners use the Gemini app to write unit and edge-case tests for untested code, diagnose a failing test and a flaky one, and prove that a test really guards the behaviour instead of just passing. They leave with a repeatable prompt pattern for tests they can trust. About 45 minutes including the final.
Gemini for Developers Pathway — Gemini for developers from coding in Gemini chat to the Antigravity CLI and Google Antigravity, agentic engineering, and guarded production integrations on the Gemini API and AI Studio. Also includes 4 optional playbooks (Testing, Code Review, Refactoring & Migration, Docs & Onboarding) to take any time after Essentials; they don't count toward the certificate.

Frequently asked questions

How long does this course take?

It runs roughly 45 minutes at a typical pace. Because every session adapts, someone who already knows a topic moves through it quickly instead of sitting through an explanation they do not need.

How is it assigned to a team?

An administrator assigns it from the Vero dashboard to one person, a team, a department or the whole company, and sees progress and results per person and per skill.

Can we customise it with our own documents and terminology?

Yes. Administrators can copy this course into their own library and adapt it — edit the outline, change the duration, swap the assessment format, or ground it in internal documentation so answers cite the company's own source material.

Course code TUL-GEM-DEV-123.