QCon Software Development Conferences

Uncover emerging trends and practices from the world’s most innovative software professionals to help you validate your software roadmap. Celebrating 20+ years.

[QCon Software Development Conferences @QCon]

More sessions like this are lined up for QCon London 2027, April 13-16.

Find out more about QCon London 2027 here: https://t.co/RF3LqoFEML

#QConLondon #CodingAgents #DeveloperExperience

[QCon Software Development Conferences @QCon]

When a codebase is predictable, agents can generate more correct code.

Jo Kelly-Fenton, Engineer at Spotify, explains the compounding effect: more correct code is cheaper to verify automatically, which reduces review load and creates more capacity to keep improving the codebase.

[QCon Software Development Conferences @QCon]

More sessions like this are lined up for QCon London 2027, April 13-16.

Find out more about QCon London 2027 here: https://t.co/bC8QULTGw6

#QConLondon #AIEvals #RAG

[QCon Software Development Conferences @QCon]

Building an evaluation dataset can look like a large upfront investment, which is one reason teams defer it.

[QCon Software Development Conferences @QCon]

Lan Chu, AI Tech Lead and Senior Data Scientist, recommends starting with a small set of real user queries covering the key production cases. They can give more useful signal than large batches of synthetic examples.

[QCon Software Development Conferences @QCon]

More sessions like this are lined up for QCon London 2027, April 13-16.

Find out more about QCon London 2027 here: https://t.co/N7Z7bPohEt

#QConLondon #EngineeringLeadership #DeveloperExperience

[QCon Software Development Conferences @QCon]

A question about dependency injection frameworks on the company Slack came back with 342 replies.

[QCon Software Development Conferences @QCon]

Jo Kelly-Fenton, Engineer at Spotify, explains how a five-person advisory board was given responsibility for the call, turning a company-wide debate into a smaller, explicit decision-making process.

[QCon Software Development Conferences @QCon]

More sessions like this are lined up for QCon London 2027, April 13-16.

Find out more about QCon London 2027 here: https://t.co/t9Km6gDGUp

#QConLondon #AIEvals #AIEngineering

[QCon Software Development Conferences @QCon]

Running an AI system a few times and getting reasonable-looking output isn't the same as evaluating it.

[QCon Software Development Conferences @QCon]

Lan Chu, AI Tech Lead and Senior Data Scientist, describes two phases: a controlled dataset to test quality before launch, then production signals to show where the evaluation set and the system need to evolve.

[QCon Software Development Conferences @QCon]

More sessions like this are lined up for QCon London 2027, April 13-16.

Find out more about QCon London 2027 here: https://t.co/a5sEf3V7lx

#QConLondon #CodingAgents #CodeReview

[QCon Software Development Conferences @QCon]

Airplanes can largely fly themselves, yet pilots still monitor the system and judge when something isn't safe.

[QCon Software Development Conferences @QCon]

Aleksandar Mitic, Software Engineer at Spotify, uses that analogy for reviewing agent-generated PRs: the reviewer monitors the evidence and decides whether the change is safe to merge, rather than recreating every step.

[QCon Software Development Conferences @QCon]

More sessions like this are lined up for QCon London 2027, April 13-16.

Find out more about QCon London 2027 here: https://t.co/N6qAvqmHem

#QConLondon #RAG #AIEngineering

[QCon Software Development Conferences @QCon]

A production RAG query about Mexico's 2026 monetary policy returned perfectly relevant results. Every one was from 2020 or 2021.

[QCon Software Development Conferences @QCon]

Lan Chu, AI Tech Lead and Senior Data Scientist, explains the missing signal: recency wasn't part of the scoring, so the retrieval system never represented the query's time intent.

[QCon Software Development Conferences @QCon]

The sessions cover Netflix’s key-value platform, 800 stateful Valkey clusters at Snapchat, object-storage-backed systems, distributed Postgres under agent workloads, and adaptive systems.

[QCon Software Development Conferences @QCon]

Latency, consistency, partial failure, scaling, and observability shape whether a distributed system can be trusted.

Review the Distributed Systems in Production track at QCon San Francisco 2026: https://t.co/8bVX4b2hRn

[QCon Software Development Conferences @QCon]

More sessions like this are lined up for QCon London 2027, April 13-16.

Find out more about QCon London 2027 here: https://t.co/ZsNGcZPHdj

#QConLondon #FeatureStore #DataEngineering

[QCon Software Development Conferences @QCon]

Aggregations such as sum and count don't depend on the order in which data is processed.

[QCon Software Development Conferences @QCon]

Nikhil Simha, Co-Founder & CTO at https://t.co/1TEgcMkM6j, explains how Chronon uses that property for rolling-window aggregations: split data across machines, aggregate independently, merge the results. The outcome doesn't change.