Duolingo Kubernetes migration timeline?

Ongoing — foundations built in a year, early services live, full fleet trickling over.

Why move from AWS ECS to Kubernetes ?

ECS too basic for massive scale; K8s brings ecosystem (Argo, Karpenter), multi-cloud, richer features.

Kubernetes migration team size at Duolingo?

Just 6-7: PM, lead, two engineers, rotating specialists.

Will Kubernetes slow down Duolingo engineers?

Short-term ramp-up yes, long-term self-service speeds them up.

🏗️ DevOps & Infrastructure

Duolingo's Kubernetes Leap: Ditching ECS for a Scalable Future

Duolingo had it easy with AWS ECS — simple, reliable. But with 128 million users, they leaped to Kubernetes, unlocking an ecosystem that could turbocharge their language empire.

Open Source Beat Apr 07, 2026 4 min read

Franka Passing presenting Duolingo's Kubernetes migration journey at InfoQ

⚡ Key Takeaways

Tiny 6-7 person team drives massive migration from ECS to EKS 𝕏
Kubernetes unlocks ecosystem tools ECS lacks, perfect for Duolingo's scale 𝕏
Iterative approach with early adopters yields real trench lessons 𝕏

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Open Source Beat

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#AWS ECS to EKS #AWS orchestration #Duolingo EKS #Duolingo engineering #ECS to Kubernetes #Kubernetes migration #container orchestration

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Originally reported by InfoQ

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