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Short, practical courses built from what interviewers ask today. Read every lesson free.

65

courses

335

lessons

250 h

of reading

AI engineer

8 courses
Advanced

Agents, Evals & LLMOps

  1. 01Tool & function calling foundations
  2. 02Agent patterns: plan, act, recover
  3. 03MCP: standardizing tools & context
7 lessons5 h 30 min6 skills
Intermediate

Backend Foundations for AI Builders

  1. 01HTTP, REST, and API design that survives clients
  2. 02Data modeling, transactions, and when not to normalize
  3. 03AuthN/Z: sessions, tokens, RBAC, service identity
8 lessons6 h 47 min6 skills
Intermediate

Behavioral & Storytelling for Technical Interviews

  1. 01What behavioral rounds actually grade
  2. 02STAR / PAR that sounds like a senior, not a script
  3. 03Ownership, agency, and tell me about a project
8 lessons6 h 26 min6 skills
Intermediate

Coding Interviews for Applied Engineers

  1. 01The interview loop and the hire rubric
  2. 02Two pointers on arrays and lists
  3. 03Sliding window
8 lessons6 h 30 min5 skills
Intermediate

Ship Your First LLM Feature

  1. 01How LLMs actually behave
  2. 02Prompting & context engineering
  3. 03Structured outputs & function schemas
6 lessons4 h 48 min5 skills
Intermediate

Retrieval-Augmented Generation

  1. 01Retrieval foundations & the shapes of RAG
  2. 02Chunking & contextual retrieval
  3. 03Hybrid retrieval & the multi-stage pipeline
7 lessons5 h 30 min5 skills
Intermediate

SQL & Data Modeling Interviews

  1. 01SQL mental model: grain, order, nulls
  2. 02Joins & nulls under interview pressure
  3. 03Aggregations & metric definitions
8 lessons6 h 37 min6 skills
Advanced

SWE System Design Interview

  1. 01Building blocks every round reuses
  2. 02The 45–60 min framework + capacity with a why
  3. 03Multi-region, multi-tenancy, cost, ops
8 lessons7 h 25 min6 skills

Forward deployed

8 courses
Intermediate

Backend Foundations for AI Builders

  1. 01HTTP, REST, and API design that survives clients
  2. 02Data modeling, transactions, and when not to normalize
  3. 03AuthN/Z: sessions, tokens, RBAC, service identity
8 lessons6 h 47 min6 skills
Intermediate

Behavioral & Storytelling for Technical Interviews

  1. 01What behavioral rounds actually grade
  2. 02STAR / PAR that sounds like a senior, not a script
  3. 03Ownership, agency, and tell me about a project
8 lessons6 h 26 min6 skills
Intermediate

Coding Interviews for Applied Engineers

  1. 01The interview loop and the hire rubric
  2. 02Two pointers on arrays and lists
  3. 03Sliding window
8 lessons6 h 30 min5 skills
Intermediate

Discovery, Decomposition & Client Communication

  1. 01Discovery: the questions before code
  2. 02Decomposing vague problems
  3. 03Defining success & first 90 days
6 lessons4 h 50 min5 skills
Advanced

Enterprise RAG & Secure Deployment

  1. 01Enterprise RAG architecture
  2. 02Auth, SSO, RBAC & auditability
  3. 03Private/VPC deployment patterns
6 lessons4 h 48 min5 skills
Intermediate

Full-Stack + Enterprise AI Integration

  1. 01Data wrangling under the gun
  2. 02APIs & integration patterns
  3. 03The LLM app/agent layer
6 lessons4 h 48 min5 skills
Intermediate

SQL & Data Modeling Interviews

  1. 01SQL mental model: grain, order, nulls
  2. 02Joins & nulls under interview pressure
  3. 03Aggregations & metric definitions
8 lessons6 h 37 min6 skills
Advanced

SWE System Design Interview

  1. 01Building blocks every round reuses
  2. 02The 45–60 min framework + capacity with a why
  3. 03Multi-region, multi-tenancy, cost, ops
8 lessons7 h 25 min6 skills

Software engineer

6 courses
Intermediate

Backend Foundations for AI Builders

  1. 01HTTP, REST, and API design that survives clients
  2. 02Data modeling, transactions, and when not to normalize
  3. 03AuthN/Z: sessions, tokens, RBAC, service identity
8 lessons6 h 47 min6 skills
Intermediate

Behavioral & Storytelling for Technical Interviews

  1. 01What behavioral rounds actually grade
  2. 02STAR / PAR that sounds like a senior, not a script
  3. 03Ownership, agency, and tell me about a project
8 lessons6 h 26 min6 skills
Intermediate

Coding Interviews for Applied Engineers

  1. 01The interview loop and the hire rubric
  2. 02Two pointers on arrays and lists
  3. 03Sliding window
8 lessons6 h 30 min5 skills
Intermediate

Frontend Engineering for Product Teams

  1. 01What production FE ownership means
  2. 02React + Next.js core and interview questions
  3. 03Component architecture and state design
8 lessons7 h 39 min6 skills
Intermediate

SQL & Data Modeling Interviews

  1. 01SQL mental model: grain, order, nulls
  2. 02Joins & nulls under interview pressure
  3. 03Aggregations & metric definitions
8 lessons6 h 37 min6 skills
Advanced

SWE System Design Interview

  1. 01Building blocks every round reuses
  2. 02The 45–60 min framework + capacity with a why
  3. 03Multi-region, multi-tenancy, cost, ops
8 lessons7 h 25 min6 skills

AI PM

5 courses
Intermediate

Eval, Metrics & Responsible-AI Launch

  1. 01Defining success for AI products
  2. 02Product KPIs + model-quality metrics
  3. 03Offline, online & human evaluation
6 lessons4 h 48 min6 skills
Intermediate

Behavioral & Storytelling for Technical Interviews

  1. 01What behavioral rounds actually grade
  2. 02STAR / PAR that sounds like a senior, not a script
  3. 03Ownership, agency, and tell me about a project
8 lessons6 h 26 min6 skills
Intermediate

AI Product Sense & PRDs

  1. 01AI product-sense framework
  2. 02Designing for trust & failure
  3. 03Prioritization under uncertainty
6 lessons4 h 45 min6 skills
Foundational

AI Technical Fluency for PMs

  1. 01LLMs for PMs
  2. 02Prompting & context
  3. 03RAG vs fine-tuning vs API
6 lessons4 h 49 min6 skills
Intermediate

Product Case Studies (Senior Bar)

  1. 01How to run any product case (senior bar)
  2. 02Case type: Design a 0→1 product
  3. 03Case type: Improve a metric
8 lessons7 h 28 min6 skills

GTM engineer

5 courses
Intermediate

Behavioral & Storytelling for Technical Interviews

  1. 01What behavioral rounds actually grade
  2. 02STAR / PAR that sounds like a senior, not a script
  3. 03Ownership, agency, and tell me about a project
8 lessons6 h 26 min6 skills
Intermediate

Customer-Facing AI Prototypes

  1. 01Building a convincing LLM demo, fast
  2. 02Grounding the demo in the customer’s own documents
  3. 03Automating sales and support workflows with agents
5 lessons4 h4 skills
Intermediate

GTM Engineering: Outbound Systems

  1. 01Outbound as a system: funnel, SLAs, unit economics
  2. 02ICP definition and scoring services that don't rot
  3. 03Enrichment waterfalls: coverage, cost, and freshness
8 lessons6 h 28 min6 skills
Intermediate

AI Solution Design, Evals & Demo Selling

  1. 01Enterprise AI system design
  2. 02Evals for customer-facing AI
  3. 03Observability & feedback loops
6 lessons4 h 46 min5 skills
Intermediate

GTM Engineering Stack & Automation

  1. 01RevOps & the GTM funnel, end to end
  2. 02CRM data modeling & hygiene
  3. 03APIs, webhooks & auth
6 lessons4 h 46 min5 skills

Data scientist

4 courses
Intermediate

Experiment Design & A/B Testing

  1. 01Hypotheses & metrics
  2. 02Significance & power
  3. 03A/B test design & the peeking problem
6 lessons4 h 47 min4 skills
Intermediate

GenAI Evaluation for Data Scientists

  1. 01Why GenAI eval is hard
  2. 02Golden datasets & rubrics
  3. 03LLM-as-judge & its traps
6 lessons4 h 44 min6 skills
Intermediate

ML Fundamentals for Interviews

  1. 01Bias-variance & generalization
  2. 02Loss functions & optimization
  3. 03Regularization & calibration
6 lessons4 h 45 min4 skills
Intermediate

SQL & Data Modeling Interviews

  1. 01SQL mental model: grain, order, nulls
  2. 02Joins & nulls under interview pressure
  3. 03Aggregations & metric definitions
8 lessons6 h 37 min6 skills

LLM engineer

4 courses
Advanced

Fine-Tuning & Inference Optimization

  1. 01Fine-tune vs prompt vs RAG — the decision
  2. 02Datasets for SFT — quality over quantity
  3. 03LoRA & QLoRA — PEFT and the memory math
6 lessons4 h 48 min5 skills
Advanced

ML & LLM System Design Interview

  1. 01The ML system design framework
  2. 02Data, features & embedding pipelines
  3. 03Serving, latency & cost at scale
6 lessons4 h 45 min6 skills
Advanced

SWE System Design Interview

  1. 01Building blocks every round reuses
  2. 02The 45–60 min framework + capacity with a why
  3. 03Multi-region, multi-tenancy, cost, ops
8 lessons7 h 25 min6 skills
Advanced

Transformers & LLM Internals

  1. 01Tokenization deep dive
  2. 02Attention from scratch
  3. 03Embeddings & positional encoding
7 lessons5 h 31 min5 skills

AI designer

3 courses
Intermediate

AI Design Systems & Patterns

  1. 01A pattern language for AI
  2. 02Naming & terminology
  3. 03Provenance: authored vs suggested vs executed
5 lessons4 h5 skills
Intermediate

Designing Human-AI Interaction

  1. 01Mental models for AI
  2. 02Designing for uncertainty & errors
  3. 03Trust calibration & transparency
6 lessons4 h 52 min5 skills
Intermediate

Prompt & Context as a Design Material

  1. 01How prompts shape UX
  2. 02Context, retrieval & tools for designers
  3. 03Designing AI copy & system messages
6 lessons4 h 45 min6 skills

Agent engineer

3 courses
Advanced

Agent failure investigation and interview lab

  1. 01Find the first wrong transition
  2. 02Build an outcome verifier that cannot be fooled by narration
  3. 03Defend architecture with a failure budget
4 lessons2 h 20 min6 skills
Advanced

Stateful agent workflows that survive interruption

  1. 01Persist the task, not just the conversation
  2. 02Budgets are part of control flow
  3. 03Parallel work needs independent ownership
4 lessons2 h 20 min6 skills
Intermediate

Reliable tool contracts for agents

  1. 01A tool call is a request, not a result
  2. 02Retries and the uncertain-write window
  3. 03Untrusted text cannot grant permission
4 lessons2 h 20 min6 skills

AI infra platform

3 courses
Intermediate

GPU capacity and inference mechanics

  1. 01Build a GPU memory budget
  2. 02Explain prefill, decode and batching
  3. 03Choose replication or model parallelism
4 lessons1 h 40 min6 skills
Intermediate

AI infrastructure interview lab

  1. 01Diagnose a training slowdown across ranks
  2. 02Design a checkpoint that can actually resume
  3. 03Work a serving incident from observations
4 lessons1 h 40 min6 skills
Intermediate

Reliable multi-tenant model serving

  1. 01Put admission before the expensive work
  2. 02Make cache reuse measurable and safe
  3. 03Scale using queue behavior and warm capacity
4 lessons1 h 40 min6 skills

Backend engineer

3 courses
Intermediate

Asynchronous backend operations

  1. 01An asynchronous API needs an honest contract
  2. 02Concurrency is a capacity decision
  3. 03Retries can turn an outage into overload
4 lessons2 h 45 min6 skills
Intermediate

Correct writes under failure

  1. 01A successful request is not the invariant
  2. 02Read the schedule before selecting isolation
  3. 03A committed order needs a durable next step
4 lessons2 h 45 min6 skills
Advanced

Backend debugging and design interviews

  1. 01Investigate the payment that appears twice
  2. 02Review a patch as a future operator
  3. 03Design one path before scaling the diagram
4 lessons4 h6 skills

Frontend engineer

3 courses
Intermediate

Behavioral & Storytelling for Technical Interviews

  1. 01What behavioral rounds actually grade
  2. 02STAR / PAR that sounds like a senior, not a script
  3. 03Ownership, agency, and tell me about a project
8 lessons6 h 26 min6 skills
Intermediate

Coding Interviews for Applied Engineers

  1. 01The interview loop and the hire rubric
  2. 02Two pointers on arrays and lists
  3. 03Sliding window
8 lessons6 h 30 min5 skills
Intermediate

Frontend Engineering for Product Teams

  1. 01What production FE ownership means
  2. 02React + Next.js core and interview questions
  3. 03Component architecture and state design
8 lessons7 h 39 min6 skills

Data engineer

3 courses
Intermediate

Event correctness, late data and replay

  1. 01Give each event a business meaning
  2. 02Draw the exactly-once boundary
  3. 03Handle late data with explicit window rules
4 lessons1 h 40 min6 skills
Intermediate

Data engineering interview lab

  1. 01Reconstruct latest state from a dirty change table
  2. 02Calculate a cohort metric with a fixed denominator
  3. 03Design a delayed-event alert pipeline
4 lessons1 h 40 min6 skills
Intermediate

Trustworthy production data pipelines

  1. 01Join the snapshot to the change log
  2. 02Evolve schemas without silently changing meaning
  3. 03Publish data only when its contract passes
4 lessons1 h 40 min6 skills

DevRel

3 courses
Advanced

DevRel technical interview studio

  1. 01Design a ten-minute technical presentation
  2. 02Debug the demo without losing the audience
  3. 03Edit for a successful reader action
4 lessons4 h6 skills
Intermediate

Teach developers through working examples

  1. 01Start with what the developer must do
  2. 02Make the demo reproducible on an ordinary laptop
  3. 03Document the failure a learner will actually see
4 lessons4 h6 skills
Intermediate

Build a workshop and feedback loop

  1. 01A workshop is a sequence of learner decisions
  2. 02Turn workshop friction into a reproducible issue
  3. 03Measure useful adoption without overclaiming attribution
4 lessons4 h6 skills

Founding engineer

3 courses
Intermediate

Ship and operate a first product

  1. 01A release plan includes the previous version
  2. 02Measure use that changes a customer's work
  3. 03Operate the incident before writing the postmortem
4 lessons4 h6 skills
Advanced

Founding engineer decision interviews

  1. 01Choose what will not fit this week
  2. 02Leave a decision trail in the work sample
  3. 03Change the design when the numbers change
4 lessons4 h6 skills
Intermediate

Scope and architecture under uncertainty

  1. 01A feature request is evidence to investigate
  2. 02Choose a small architecture that can change
  3. 03Know the cost of one successful outcome
4 lessons4 h6 skills

Fullstack engineer

3 courses
Intermediate

Build a reliable async workflow

  1. 01Build the smallest complete export flow
  2. 02Treat progress messages as hints about durable state
  3. 03Conflicts and cancellation are user-visible decisions
4 lessons4 h6 skills
Advanced

Full-stack interview work samples

  1. 01Turn a broad dashboard brief into a finished core
  2. 02Debug the search that shows the wrong customer
  3. 03Explain the waterfall with numbers
4 lessons4 h6 skills
Intermediate

State across browser and server

  1. 01One user action crosses several versions of reality
  2. 02Optimistic interfaces need a reconciliation rule
  3. 03A server-rendered component is still a data boundary
4 lessons4 h6 skills

ML engineer

3 courses
Intermediate

Training data contracts for ML engineers

  1. 01What did the system know at prediction time?
  2. 02Split by the unit you want to generalize to
  3. 03Labels can be missing for a reason
4 lessons2 h 20 min6 skills
Advanced

ML interview case lab: debug the decision, not the diagram

  1. 01Use a tiny example to debug the learning loop
  2. 02Why precision falls when the world changes
  3. 03Offline improvement can miss the product objective
4 lessons2 h 20 min6 skills
Intermediate

Model release decisions under real constraints

  1. 01A threshold is an operating decision
  2. 02Ranking quality does not make scores trustworthy probabilities
  3. 03A release needs an observable escape route
4 lessons2 h 20 min6 skills

Platform engineer

3 courses
Intermediate

Platform incident and design interviews

  1. 01Separate naming, routing, and application failures
  2. 02Plan maintenance without confusing it with failure tolerance
  3. 03Design a safe self-service scaling API
4 lessons1 h 40 min6 skills
Intermediate

Safe delivery and developer platforms

  1. 01Keep a rollout inside its capacity budget
  2. 02Treat infrastructure state as shared operational data
  3. 03Build a supported path with an escape route
4 lessons1 h 40 min6 skills
Intermediate

Kubernetes control and workload contracts

  1. 01Read desired state as a control loop
  2. 02Budget requests, limits and scheduling
  3. 03Choose probes that do not create an outage
4 lessons1 h 40 min6 skills

Research engineer

3 courses
Intermediate

Reproducible experiment systems

  1. 01The experiment is larger than the model file
  2. 02A checkpoint is a continuation contract
  3. 03A seed is one control, not a reproducibility guarantee
4 lessons2 h 20 min6 skills
Advanced

Research engineering interview lab

  1. 01Reproduction triage: find the first disagreement
  2. 02Optimize a benchmark without changing the problem
  3. 03Spend experiment budget on discriminating tests
4 lessons2 h 20 min6 skills
Advanced

Training performance investigations

  1. 01Optimize the critical path you actually measured
  2. 02Memory accounting before memory tricks
  3. 03Mixed precision changes arithmetic, so test the update
4 lessons2 h 20 min6 skills

Research scientist

3 courses
Advanced

Valid empirical claims for research scientists

  1. 01Name the claim before selecting the experiment
  2. 02Pair the evidence and respect the sampling unit
  3. 03Selection changes the meaning of the winning score
4 lessons2 h 20 min6 skills
Advanced

Research interview lab: defend the evidence

  1. 01When the average tells the wrong comparison
  2. 02Critique a result without substituting your own story
  3. 03Propose a study that can fail informatively
4 lessons2 h 20 min6 skills
Advanced

Research study design: isolate the mechanism

  1. 01Ablations need controls that answer the explanation
  2. 02Equal steps may not mean a fair resource comparison
  3. 03Keep the evaluation separate from the method's memory
4 lessons2 h 20 min6 skills

Security engineer

3 courses
Intermediate

Secure delivery and useful detection

  1. 01Bind CI identity to the exact deployment authority
  2. 02Verify what an artifact attestation actually proves
  3. 03Build a detection rule with a useful evidence trail
4 lessons1 h 40 min6 skills
Intermediate

Security engineering interview lab

  1. 01Review an export handler from authority to output
  2. 02Scope an incident from incomplete audit evidence
  3. 03Negotiate a temporary security exception
4 lessons1 h 40 min6 skills
Intermediate

Threat models and authorization boundaries

  1. 01Turn a feature diagram into a threat model
  2. 02Make authorization follow the object
  3. 03Design a server-side fetcher with bounded reach
4 lessons1 h 40 min6 skills