Notes from the work

One email when a tutorial or migration write-up goes live. Nothing else, and one click to leave.

LeanZero

Two people in Romania doing Atlassian migrations, Forge apps and practical AI work for teams that would rather talk to the person doing the job. Most of what we learn ends up on this site.

Services

  • Atlassian Migrations
  • Atlassian FastShift
  • Atlassian Maintenance
  • Forge App Development
  • AI Development Consultation

Topics

  • Jira
  • Jira Service Management
  • Confluence
  • Bitbucket
  • Atlassian Forge
  • Cloud Migration
  • Local AI
  • AI Coding
  • Certifications
  • Atlassian Team
  • All topics

Company

  • Blog
  • Tutorials
  • Contact

Community

  • Join Discord
  • Support this site

© 2026 LeanZero. All rights reserved.

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Available for new projects

Atlassian & AI Expertise,Made Personal

Migrations, custom Forge apps, day-to-day admin and practical AI enablement — senior and hands-on, at €50/hour with no retainer and flat-rate projects you approve up front.

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Try it yourself

Our three Jira and Confluence apps on a demo site you run as an admin, and free practice exams for every ACP certification.

NewFree, no card5 days, extend up to 3 times

Run our apps as an admin

Your own account on our Atlassian demo site with Jira and Confluence admin rights, already populated with projects, plans and spaces.

  • CogniRunner
  • LeanZero Management
  • Sentinel Vault
  1. 1Enter your work emailWe email you a link.
  2. 2Confirm from the emailYour account gets access.
  3. 3Log in as an adminThe apps' settings are yours.
Get demo accessWhat's on the site

3,138

ACP practice questionsFree

Mock exams for all 5 Atlassian certifications. Every answer explained and quoted from Atlassian’s docs.

  • ACP-120Jira Administration for Cloud
  • ACP-220Confluence Administration for Cloud
  • ACP-420Jira Service Management for Cloud
  • ACP-520Atlassian Cloud Organization Administration
  • ACP-620Jira Project Administration
Start a practice exam
  • MCP Web Search

    The live web for your AI agent: search, full-page and PDF extraction, GitHub reading.

    Free demo keyLearn more
  • MCP Doc Processor

    Your agent reads, creates and edits PDF, DOCX and Excel files, layout intact.

    Free demo keyLearn more
  • LeanZero Link

    One private mesh for the Macs you run Goose Swarm on. Sign in with a code by email.

    Sign in with your emailLearn more

Track Record

Fifteen years spent moving, building and maintaining Atlassian systems.

15+
Years on Atlassian
10+
Migrations delivered
9,500
Users in one migration
100%
Delivery record

Work with us

Three disciplines. The same people from the first conversation to the handover.

Atlassian migrations

Move Jira, Confluence and Bitbucket with the person who writes the migration scripts. Every app, permission and macro accounted for before the move.

  • Data Center to Cloud and cloud consolidations
  • Free assessment, then a fixed quote
  • FastShift supported: 20% off the total

9,500 users at UBS. 8,500 at SolarEdge.

From €1,000Plan your migration

Forge app development

A Jira or Confluence app built around the way your team works. Start with a working prototype, test it together, then decide what goes into production.

  • Prototype €500–€1,000; UAT from €1,000
  • Production and maintenance at €50/hour
  • Regular demos, source code and a documented handover

CogniRunner, Sentinel Vault and LeanZero Management.

Prototype from €500Shape your app

Practical AI for your team

Get coding agents working with your codebase, or run private AI on your own hardware. We set it up with you and leave you able to run it.

  • Readiness, setup and team training
  • Private AI, RAG and fine-tuning pilots
  • EU AI Act readiness; no ongoing retainer

The tools and skills we use are published on this site.

From €1,200Find your starting point

What People Say

2 client testimonials

“LeanZero worked with UBS on migrating their infrastructure from DC to cloud—a first for the bank in this space. Each step was uncharted territory, requiring careful navigation and precise execution. LeanZero did a magnificent job managing competing priorities and stakeholder demands. We threw ideas at them constantly—this didn't make their life any easier. they handled intense pressure with welcome calmness. 100% recommended. Excellent partner to work with.”

 Geoff Robinson MFM
Geoff Robinson MFM
Managing Director - Global Head of Fundamental Analytics, UBS

“Partnering with LeanZero for three years elevated our JIRA operations at Fiskars Group. As our dedicated JIRA owner, they delivered a lightweight migration from DC to cloud and implemented technical solutions that genuinely improved how our IT team managed services—streamlining workflows and strengthening our operational foundation along the way. Their reliability and expertise made them a trusted partner throughout our engagement.”

Michael Rossi
Michael Rossi
Senior IT Manager, Service Management at Fiskars Group, Fiskars Group

Featured Projects

Three apps on the Marketplace, two MCP servers and an agent, all in daily use

Free on Marketplace

LeanZero Management

Project planning inside Jira Cloud with a real scheduling engine: drag one date and the dependent work re-plans on your working calendar, and nothing reaches Jira until you review it.

Learn More
On the Marketplace

Sentinel Vault

Document control for Confluence Cloud: sealed attachments and page sections, enforced approval workflows, and automatic reversion of tampering. Available now on the Atlassian Marketplace.

Learn More
Paid via Atlassian

CogniRunner

AI workflow rules for Jira: validators, conditions, post-functions, listeners for 68 Jira events and scheduled jobs that read the meaning of your issues — with your own AI provider (Anthropic, OpenAI, Azure, Bedrock, local) or Atlassian's zero-key one.

Learn More
View All Projects

Latest Content

Write-ups from the last few weeks of client and product work

Atlassian Partner Accelerate at Team '26 Europe: Forge, revenue share and who we met
ArticleAtlassian Team

Atlassian Partner Accelerate at Team '26 Europe: Forge, revenue share and who we met

Atlassian Partner Accelerate, the partner-only day before Team '26 Europe, was for us a day of meeting solution partners and other Forge app builders. Here is what was on the screens about Forge and Teamwork Graph, the Marketplace revenue share that applies from 1 October 2026, the partner tiers, how we shared LeanZero by QR code, and a little of Amsterdam.

Gabriela PerdumOct 6, 20267 min read
Claude Sonnet 5.5 vs Opus 5.5 and GPT-6.1 Sol: the generalist and the specialist
ArticleLocal AIAtlassian Forge

Claude Sonnet 5.5 vs Opus 5.5 and GPT-6.1 Sol: the generalist and the specialist

Claude Sonnet 5.5 edged Claude Opus 5.5 on our general-programming benchmark, 0.7984 to 0.7926, a margin I read as level. On an Atlassian Forge app, Opus won 0.9767 to 0.5508. Every check behind both results, GPT-6.1 Sol and Sol Pro on the same two boards, how the benchmarks grade a running app, and the full bill for fine-tuning our own 27B model.

Mihai PerdumOct 5, 202645 min read
Atlassian Team '26 Europe: dates, agenda, keynote and livestream times
ArticleAtlassian Team

Atlassian Team '26 Europe: dates, agenda, keynote and livestream times

Atlassian Team '26 Europe runs 6-8 October 2026 at RAI Amsterdam. The Founder Keynote is Wednesday at 09:00 CEST (08:00 UK) and free to watch without registering. Here is the agenda by day, the keynote times, how to watch online, what Anaheim announced in May, and the three places where Atlassian's own pages disagree.

Mihai PerdumOct 5, 20266 min read
View All Articles

Tell us what you’re working on

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