01
.NET setup, C# syntax and types
Explain and apply SDK/runtime, project/solution, nullable reference types, decimal, records to a tested, privacy-safe solution.
- .NET setup, C# syntax and types60 min
← Course catalogue
SWE-220Intermediate
Software development
C# & .NET Application Development
Build maintainable C# applications and APIs using modern .NET development practices.
Part of these pathways
Course outline: enrolment opens after THNF content and assessment review.
What you will be able to do
Clear outcomes. Practical evidence.
- Use C# language features
- Apply object-oriented design
- Build .NET services
- Test data and application layers
Course structure
Modules and lessons
02
Control flow and methods
Explain and apply patterns, switch expressions, loops, parameters, return, extension methods to a tested, privacy-safe solution.
- Control flow and methods60 min
03
Collections, LINQ and exceptions
Explain and apply List/Dictionary/HashSet, LINQ, deferred execution, exceptions to a tested, privacy-safe solution.
- Collections, LINQ and exceptions60 min
04
Classes, records and encapsulation
Explain and apply class/record, constructor, property, init, invariant, access modifier to a tested, privacy-safe solution.
- Classes, records and encapsulation60 min
05
Interfaces, inheritance and dependency principles
Explain and apply interface, composition, DI, substitution, SOLID to a tested, privacy-safe solution.
- Interfaces, inheritance and dependency principles60 min
06
JSON, files and asynchronous work
Explain and apply System.Text.Json, streams, File, Task, async/await, cancellation to a tested, privacy-safe solution.
- JSON, files and asynchronous work60 min
07
Entity Framework Core
Explain and apply DbContext, entity configuration, migrations, tracking, relationships to a tested, privacy-safe solution.
- Entity Framework Core60 min
08
Testing, mocking and logging
Explain and apply xUnit, Theory, fixtures, mock/fake, ILogger, structured logging to a tested, privacy-safe solution.
- Testing, mocking and logging60 min
09
ASP.NET Core Web API
Explain and apply middleware, routing, controller/minimal API, DTO, validation, OpenAPI to a tested, privacy-safe solution.
- ASP.NET Core Web API60 min
10
Security and operations
Explain and apply authentication, authorisation policy, secrets, HTTPS, health checks, rate limits to a tested, privacy-safe solution.
- Security and operations60 min
11
Capstone sprint
Explain and apply backlog, vertical slices, CI, review, definition of done to a tested, privacy-safe solution.
- Capstone sprint60 min
12
Release and demonstration
Explain and apply publish, environment config, versioning, README, monitoring, retrospective to a tested, privacy-safe solution.
- Release and demonstration60 min
Access and progression
Know what the course requires.
The required capability matters; the learner does not have to personally own every device.
Who it is for
Aspiring developers, technical learners, career changers and practitioners seeking applied computing skills.
Hardware access
Personal 64-bit computer with 4 GB RAM and 20 GB free, or use the required device and software at a readiness-approved THNF centre.
Software and practical access
Course software is available through the text-first pack, an approved offline installer or a readiness-approved THNF centre.
Possible progression
Junior development, data, web, application-support or technical-project progression appropriate to the completed portfolio.
Progression is not a guarantee of employment or external certification.Sierra Leone context
Mobile-first, low-data solutions for Sierra Leonean schools, traders, transport, agriculture, NGOs and SMEs using synthetic local names, districts and NLe values.
Skills in context
Career directions and next steps
These are realistic directions that the skills can support—not promises of employment, job titles or external certification.
- Junior software developer
- Application-support assistant
- Software-testing assistant
Possible progression pathways
Programming and software engineering