Why Extend Went All-In on Serverless Platform Engineering

Billions of requests a month on AWS Lambda can cost less than a single engineer’s laptop budget, but only if the architecture and developer workflow are designed for it.

Justin Masse, Senior Platform DevOps Engineer at Extend, shares how Extend committed early to a serverless-first approach and built a platform that prioritizes developer speed and low operational toil. The conversation breaks down what it takes to run active-active, multi-region systems in a serverless world, how the team keeps services small and fast, and why asynchronous, event-driven design changes both reliability and cost.

You’ll also hear how Extend treats developer experience as a core platform responsibility: templated microservices, fast deployment pipelines, ephemeral environments for pull requests, and infrastructure that developers can own without becoming cloud specialists. A big theme is using AWS CDK and internal abstractions to keep infrastructure close to the application code, so teams can move quickly while keeping platform standards consistent.

Finally, the discussion gets practical about tradeoffs that show up after the “serverless is easy” pitch: local development challenges, the real cost center (observability), and where AI is helping today, including an internal agent that diagnoses failed deployments and suggests fixes.

What you’ll learn

1. Why Extend avoids servers and VPC complexity, and what they use instead
2. Patterns for active-active, multi-region thinking in a serverless architecture
3. How DevEx practices like templates and ephemeral environments reduce friction
4. A pragmatic approach to IaC with CDK and reusable internal constructs
5. Where serverless costs stay low, and why observability often dominates the bill
6. How AI is being applied to platform workflows without skipping engineering judgment

Guest: Jusin Masse, Senior Platform DevOps Engineer at Extend

Justin Masse is a self-proclaimed lead chaos engineer, recognized within niche engineering communities for his expertise Chaos Engineering and Infrastructure & DevOps.

The father of three young kids, a husband, a recent MBA graduate, recent cancer survivor, and competitive powerlifter, he still finds time to actively contribute to the platform engineering community.

Justin Masse, website

Justin Masse, GitHub

Extend, website

Links to interesting things from this episode:

1. Episode with Adrian Cockroft
2. “From $erverless to Elixir” by Cory O’Daniel