Proxy Vote Designing scalable applications that costs a penny Christopher MANEU Principal Advocate Data Microsoft maneu.net

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How Proxy voting works?

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ProxyVote

Scalability requirements https://observatoire.numerique.gouv.fr/observatoire/

Scalability requirements At time of building. As of Sept 2023: 2.6M https://observatoire.numerique.gouv.fr/observatoire/

Iteration 1: Start Simple PostgreSQL database App Service

Cost-based architecture

Iteration 1: Start Simple Cloud Economics: Yearly cost ~ 3000€ Cost per proxy voting Paper Proxy Voting (1 A4 paper sheet) 0.00304 € / vote 0.00886 €/ vote Iteration 1 Voting x2.9

Iteration 1 Takeaways Cheaper than Paper-based Unknown scalability App service can autoscale up to 10 instances PostgreSQL Flexible Server can scale. Uneven usage throughout day/week/month. Long no-usage periods

Iteration 2: Serverless architecture Cosmos DB (SQL) Database Serverless APIs Static Front

Iteration 2: Serverless architecture Process / Steps Function invocation Cosmos DB RUs Register Proxy Voter Access the homepage 0 0 Login (State OpenId) 0 0 View Application Form 0 0 Submit Application 1 6 - C Validate Application email 1 1 - R Validate Application Identity Access internal app homepage 0 0 Search application by Id 1 1 – R Validate application 1 6 - C Total 4 14

Iteration 2: Serverless Cloud Economics: Cost at @1M Reg: ~5€ / year, @3M: ~15€ Cost per proxy voting Paper Proxy Voting (1 A4 paper sheet) 0.00304 € / vote 0.00886 €/ vote Iteration 1 Voting x672 0.00000452 € / vote Iteration 2 Voting

Iteration 2 Takeaways Scalability predictable Cosmos DB Serverless Max RU/s: 5000-20000 From 0 to 800-3200 applications / s instantly, 0 engineering effort All France yearly application can be processed in <14 minutes, for less than 15€

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Q&A Christopher MANEU maneu.net