Scaling
53 bites tagged Scaling — interview questions with model answers, and 60-second explainers.
SAFe vs. LeSS: Planning, Dependencies, and Autonomy
Tests your grasp of the trade-offs between coordination and autonomy in scaling frameworks. A good answer contrasts SAFe's top-down PI Planning with LeSS's bottom-up, team-focused approach.
What is the purpose of a shared 'Definition of Done'?
Tests your ability to ensure quality and transparency across multiple teams. A shared 'Definition of Done' is a formal description of quality for the integrated Increment. It ensures all work is combinable and shippable.
What is a Community of Practice or Guild?
Tests understanding of cross-team knowledge sharing. Define CoPs as voluntary groups for a shared craft, explain their purpose (sharing best practices, standardizing tools), and give an example like a 'Frontend Guild.'
SAFe vs. LeSS: Planning, Dependencies, and Autonomy
This tests your grasp of how org structure affects engineering work. Contrast SAFe's top-down, prescriptive nature (central PI planning) with LeSS's bottom-up, team-centric model (direct dependency management). A red flag is reciting buzzwords without context.
Purpose of a Shared Definition of Done for Multiple Teams
This tests your ability to maintain quality and transparency across multiple teams. Explain that a shared Definition of Done ensures a consistent quality standard for a usable, integrated Increment, impacting testing by requiring integration and end-to-end…
What is a Scrum of Scrums and what's shared there?
This tests your understanding of scaling Agile. A good answer defines it as a coordination meeting for multiple teams, focusing on sharing inter-team blockers, dependencies, and integration points, not just status.
Agile Center of Excellence: Internal Consultants, Not Process Police
Think of an Agile CoE as internal consultants, not process police. They enable teams by providing coaching, tools, and shared standards. They're useful for scaling Agile consistently, but fail when they become a bureaucratic bottleneck instead of an…
Nexus Integration Team: Air Traffic Control for Scrum
The Nexus Integration Team is like air traffic control for multiple Scrum teams, guiding them to a single, integrated product. It's used in the Nexus framework to coordinate 3-9 teams on one product, resolving cross-team dependencies and integration failures.
Nexus Framework: Scaling Scrum Without Breaking It
Nexus is a lightweight wrapper for 3-9 Scrum teams working on one product. It adds a coordinating Nexus Integration Team and shared events to manage dependencies and deliver a single, integrated increment each sprint.
Uvicorn Workers: Scaling Your FastAPI App
Uvicorn workers are like adding cashiers to a store. Instead of one process handling all requests, you run multiple, letting your FastAPI app use all CPU cores to serve more users concurrently.
PM2 Cluster Mode: Scale Node.js Across All Cores
PM2's cluster mode lets your Node.js app run on every CPU core, multiplying its capacity. It's essential for scaling networked apps on a single machine, but requires a stateless design—storing sessions in memory will break things as requests hit different…
Sticky Sessions: Pinning a User to a Server
Sticky sessions pin a user's requests to a single server in a multi-server setup. This is crucial for stateful apps like Socket.IO, where a user's session lives on one machine.
Socket.IO Adapters: Scaling Beyond One Server
Socket.IO adapters let you scale beyond one server. They use a backend like Redis Pub/Sub to broadcast messages across all your instances, so a user on Server A gets events from Server B. The footgun is assuming this handles everything; you still need a load.
Node.js Cluster: Scaling on a Single Machine
The `cluster` module turns a single-threaded Node.js app into a multi-process server that uses all CPU cores. It's ideal for scaling network applications on one machine by sharing a single port.
Horizontal Scaling: Add More Machines, Not Bigger Ones
Horizontal scaling (scaling out) means handling more load by adding more machines to your resource pool, not upgrading a single one. It’s used for web servers behind a load balancer. The footgun is that your app must be stateless to avoid losing user data.
Load Balancing for Model Serving
A load balancer is a traffic cop for your AI model's API, directing requests to multiple model copies to prevent overload. It's essential for production systems to ensure high availability. The footgun is forgetting health checks, causing failed requests.
Mixture of Experts: Scaling Models by Activating Specialists
A Mixture of Experts (MoE) model acts like a team of specialists instead of one generalist. A router sends each token to a few expert sub-networks, enabling faster training and inference for massive models.
Design System Steering Committee: Governance in Practice
A steering committee is the board of directors for a design system, ensuring its long-term stability and direction. They set technical standards, manage releases, and resolve conflicts. The footgun is becoming a bottleneck if not diverse and well-chartered.
Release Trains: Aligning Multiple Agile Teams
A Release Train is a long-lived 'team of teams' (50-125 people) building a large solution together. It aligns multiple Agile teams to a common roadmap, ensuring they deliver value in sync.
Read Replicas: Scale Out Your Database Reads
A read replica is a read-only copy of your database that handles query traffic. Use it for read-heavy apps to prevent your primary DB from becoming a bottleneck. The footgun: replication is asynchronous, so reads from a replica can return slightly stale data.
Team Topologies: Organizing for a Fast Flow of Value
Team Topologies is an organizational design framework for accelerating value. As teams scale or adopt new tech, complexity often slows them down. This model structures teams to maintain a fast flow of delivery and innovation.
The Unfix Model: An Org Design Pattern Library
The Unfix Model treats org design like a Lego set, not a pre-built model. It's a library of patterns for companies moving beyond rigid agile frameworks to build dynamic, self-managed teams. The footgun is treating it as another framework to install wholesale.
LeSS Huge: Scaling Scrum Beyond Eight Teams
LeSS Huge is a framework for applying Scrum when over eight teams work on one product, organizing them into "Requirement Areas." It’s for massive projects, like autonomous driving systems, where dozens of teams must coordinate.
Solution Train: The Train of Agile Trains
A Solution Train is a 'train of trains,' coordinating multiple Agile Release Trains (ARTs) to build one massive product. It's used for complex systems like autonomous vehicles where many teams must align.
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