MercadoLibre
MercadoLibre says AI agents reviewed more than half a million code submissions and migrated roughly 9,000 services
MercadoLibre told shareholders that AI agents now do autonomous engineering work. They independently reviewed more than half a million code submissions and migrated roughly 9,000 services in a year, while code submissions rose 110% year on year.
Key figures
Copied exactly from the sources. Copy any figure with its citation.
up 110% YoY
Code submissions, Q2 2026 versus Q2 20251
up more than 100%
Merged code, Q2 2026 versus Q2 20251
up nearly 75%
Deployments, Q2 2026 versus Q2 2025 (rollbacks fell year on year)1
more than half a million
Code submissions independently reviewed by AI agents, over the past year1
What it took
Cost, team size and timeline were not disclosed in the sources.
The problem
MercadoLibre runs a large e-commerce and fintech business across Latin America. Its technology teams must ship more features while keeping the marketplace stable and costs in check. Routine engineering work such as reviewing code changes and moving old services to newer platforms takes a lot of engineer time.
What they built
The company moved from AI as a writing aid to AI agents that do work on their own. Its shareholder letter says that a year earlier AI was a tool engineers used to help write code. It now describes agents doing genuinely autonomous work and says human-written code has become the exception.
How they did it
The letter names two jobs for the agents: reviewing code submissions on their own and migrating services to newer platforms. It gives no detail on tools, models, team size or rollout. It adds that the company analyzes usage patterns across teams to improve its mix of models and lower the cost of the tools built on them, and that it negotiated better terms with AI suppliers.
Results
For Q2 2026 the company reports code submissions up 110% year on year, merged code up more than 100% and deployments up nearly 75%, with rollbacks down. Agents reviewed more than half a million code submissions and migrated roughly 9,000 services over the past year. The company reports that AI investment grew roughly $80mn year on year. It says Product Development expenses still fell from 8.4% to 7.2% of net revenue, because it can grow without adding engineers at its former pace.
All reported figures
| Measure | Figure | Citation |
|---|---|---|
| Code submissions, Q2 2026 versus Q2 2025 | up 110% YoY1 | |
| Merged code, Q2 2026 versus Q2 2025 | up more than 100%1 | |
| Deployments, Q2 2026 versus Q2 2025 (rollbacks fell year on year) | up nearly 75%1 | |
| Code submissions independently reviewed by AI agents, over the past year | more than half a million1 | |
| Services migrated to newer platforms by AI agents, over the past year | roughly 9,0001 | |
| Product Development expenses as a share of net revenue, Q2 2025 versus Q2 2026 | 8.4% to 7.2%1 | |
| Growth in AI investment, Q2 2026 versus Q2 2025, split between cost of goods sold and Product Development | roughly $80mn1 |
Lessons for your project
Track output and quality together. MercadoLibre reports rollbacks falling while deployments rose, which answers the usual worry that speed costs stability.
Give agents bounded, repeatable jobs first, such as reviewing code submissions and moving services to newer platforms.
Tie AI spend to a business line. The company links the gain to growing without adding engineers at the pace it once would have.
Watch the model bill. The company says it analyzes usage across teams to choose cheaper model mixes, and reports a lower cost per token.
Caveats
- The only source is the company's own Q2 2026 letter to shareholders, filed with the SEC. It is not audited and the letter gives no method for the figures.
- The letter does not say which models or tools the agents use, or how many engineers use them.
- It does not say when the agents went live. The deployed date is the date of the letter, and the agent figures cover 'the past year'.
- The letter links these gains to AI but does not separate AI's contribution from other factors.
- The Product Development share fell from 8.4% to 7.2% of net revenue, but revenue also grew 50% year on year in the same period, which contributes to a lower ratio.
- The GitHub Copilot customer story about MercadoLibre is undated and is not used here.
Sources
- MercadoLibre, Inc. Letter to Shareholders, Q2'26 Results (Exhibit 99.1)
MercadoLibre, via SEC EDGAR · 2026-08-05 · Filing · sec.gov
Summarized in our own words from the sources above. Spotted an error? See corrections.