Catalog · Nexora

Agentic AI intermediate

RAG Systems in Production

The gap between a RAG demo and a RAG product is chunking strategy, retrieval evaluation and latency budgets. Covers document parsing, chunk boundary design, hybrid retrieval, cross-encoder re-ranking, and caching layers that keep p95 sane.

DO Daniel Okafor 4.9

$89.00

13 hours

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Career Skills

Career Skills beginner

Writing for Engineers: Design Docs and Postmortems

Writing is the highest-leverage engineering skill nobody teaches. Structure a design doc so reviewers engage with the decision instead of the prose, run a blameless postmortem that produces real action items, and write updates that make your work legible to people two levels away.

AB Aisha Bello 4.8

$35.00

6 hours

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Web Development

Web Development intermediate

Web Security Essentials for Application Developers

The vulnerability classes that actually get exploited: injection, broken access control, XSS, CSRF and session fixation. Password storage, token design and cookie flags that matter, secret management, and a threat-modelling habit you can apply in a design review.

AR Ahmed Rahal 4.8

$75.00

11 hours

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Deep Learning

Deep Learning advanced

Fine-Tuning LLMs with LoRA and QLoRA

Adapt a large model on a single GPU. Parameter-efficient fine-tuning, 4-bit quantisation, dataset curation and formatting, catastrophic-forgetting mitigation, and evaluation that detects when your tune made the model worse at everything else. Includes the decision framework for fine-tune versus RAG versus prompt engineering.

AR Ahmed Rahal 4.8

$119.00

13 hours

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Agentic AI

Agentic AI intermediate

Agentic RAG: Retrieval That Reasons

Naive RAG retrieves once and hopes. Agentic RAG grades what it retrieved, rewrites the query when results are thin, and decides when it has enough context. Covers relevance grading, query rewriting loops, hybrid dense plus keyword retrieval, reciprocal rank fusion and LLM-as-judge re-ranking, with honest evaluation of when each technique actually helps.

DO Daniel Okafor 4.8

$79.00

10 hours

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Python

Python beginner

Testing Python: Pytest, Fixtures and Property-Based Testing

Tests that catch regressions instead of cementing current behaviour. Fixture composition and scoping, parametrisation, sensible mocking boundaries, property-based testing with Hypothesis, and coverage read as a diagnostic rather than a target.

TN Tomas Nowak 4.7

$45.00

8 hours

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Data Engineering

Data Engineering advanced

Lakehouse Architecture with Apache Iceberg

Table formats brought database guarantees to object storage. Snapshot isolation, hidden partitioning, schema evolution without rewrites, compaction strategy, and time-travel queries that make debugging a bad load tractable.

KM Kwame Mensah 4.5

$105.00

14 hours

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Cloud

Cloud beginner

Cloud Architecture Fundamentals

The primitives every cloud gives you and how to compose them: compute options, object storage, managed databases, queues, VPC networking and identity. Includes cost modelling and the failure modes of each pattern, so your design survives both an outage and a finance review.

EV Elena Vasquez 4.5

$59.00

13 hours

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