A Complete End-to-End Guide for Building Intelligent Recruitment Applications using Angular, ASP.NET Core, SQL Server, and AI Models
Introduction
Recruitment is one of the biggest challenges for companies today. HR teams receive thousands of job applications for each position. Manually reading, filtering, and scoring resumes is slow, expensive, and often inconsistent. Most traditional job portals only allow keyword search or basic filtering, which does not help in identifying the right candidates.
This is where AI-powered resume matching comes in. Modern machine learning (ML) models can:
Extract skills, experience, and job roles from resumes
Match candidate profiles with job descriptions
Score and rank applicants
Highlight skill gaps
Recommend other suitable roles
Reduce manual screening time
This article is a complete guide on building a production-ready AI-powered job portal using:
SQL Server (data storage and optional ML)
ASP.NET Core (backend APIs)
Angular (frontend UI)
Python ML Models / Azure AI / OpenAI Embeddings (resume matching)
It is written for beginner to senior-level developers who want to implement intelligent job-matching features in real-world applications.
1. Understanding AI-Powered Resume Matching
Resume matching uses artificial intelligence to match candidates with jobs. It involves three core steps:
1. Parsing
Extracting structured information from resumes:
Name
Education
Skills
Experience
Certifications
2. Embedding
Converting text into numeric vectors using:
3. Matching
Computing similarity between:
Candidate resume vector
Job description vector
The most common method is cosine similarity, which gives a score between 0 and 1.
2. High-Level Architecture
A scalable AI job portal looks like this:
Angular UI
↓
ASP.NET Core API
↓
SQL Server (Candidates, Jobs, Embeddings)
↓
Python ML Service or AI Embedding API
↓
Matching Engine (Similarity Scoring)
Angular handles UI, search, dashboards, and recommendations.
ASP.NET Core manages the APIs.
SQL Server stores job listings, resume content, and embedding vectors.
AI service performs feature extraction and matching.
3. Data Model for Resume Matching
You need at least three tables:
3.1 Candidate Table
CREATE TABLE Candidates (
CandidateId INT IDENTITY PRIMARY KEY,
FullName NVARCHAR(200),
Email NVARCHAR(200),
ResumeText NVARCHAR(MAX),
Skills NVARCHAR(MAX),
ExperienceYears INT,
Embedding VARBINARY(MAX)
);
3.2 Job Table
CREATE TABLE Jobs (
JobId INT IDENTITY PRIMARY KEY,
JobTitle NVARCHAR(200),
Description NVARCHAR(MAX),
RequiredSkills NVARCHAR(MAX),
MinExperience INT,
Embedding VARBINARY(MAX)
);
3.3 Match Results Table
CREATE TABLE MatchResults (
ResultId INT IDENTITY PRIMARY KEY,
CandidateId INT,
JobId INT,
Score FLOAT,
MatchedOn DATETIME DEFAULT GETDATE()
);
4. Resume Parsing
Resumes may come as:
You need a parser to extract text. You can integrate:
Tika Server
Python PyPDF2
Azure Form Recognizer
Example API workflow:
Upload Resume → Parse Text → Extract Skills → Save in DB → Generate Embedding → Store Vector
Simple Python-based text extraction example:
import PyPDF2
def extract_text_from_pdf(file_path):
reader = PyPDF2.PdfReader(file_path)
text = ""
for page in reader.pages:
text += page.extract_text()
return text
Extract skills using regex or NLP:
skills = extract_skills(text)
Save data into the SQL Server using ASP.NET Core.
5. Generating Embeddings for Jobs and Resumes
You can use:
Option A: OpenAI Embeddings (Recommended)
Models like text-embedding-3-large.
Option B: Sentence-BERT (Local Model)
Option C: Azure OpenAI
Example C# API call to generate embeddings:
public async Task<float[]> GenerateEmbedding(string text)
{
var client = new OpenAIClient(apiKey);
var response = await client.Embeddings.CreateAsync(new EmbeddingsCreateRequest
{
Model = "text-embedding-3-large",
Input = text
});
return response.Data[0].Embedding.ToArray();
}
Store vectors as VARBINARY:
byte[] binaryVector = MemoryMarshal.AsBytes<float>(embedding.AsSpan()).ToArray();
Save into SQL:
UPDATE Candidates SET Embedding = @Embedding WHERE CandidateId = @Id;
6. Matching Engine (Cosine Similarity)
Matching involves comparing vectors:
from numpy import dot
from numpy.linalg import norm
def cosine_similarity(a, b):
return dot(a, b)/(norm(a)*norm(b))
Score ranges:
7. ASP.NET Core API for Resume Matching
7.1 API: Match a Candidate to Jobs
[HttpGet("match-candidate/{id}")]
public async Task<IActionResult> MatchCandidate(int id)
{
var candidate = await _context.Candidates.FindAsync(id);
var jobs = await _context.Jobs.ToListAsync();
var candidateEmbedding = ByteArrayToFloat(candidate.Embedding);
var results = new List<JobMatchResult>();
foreach(var job in jobs)
{
var jobEmbedding = ByteArrayToFloat(job.Embedding);
var score = CosineSimilarity(candidateEmbedding, jobEmbedding);
results.Add(new JobMatchResult
{
JobId = job.JobId,
JobTitle = job.JobTitle,
Score = score
});
}
return Ok(results.OrderByDescending(r => r.Score));
}
Utility converters:
private float[] ByteArrayToFloat(byte[] bytes)
{
return MemoryMarshal.Cast<byte, float>(bytes).ToArray();
}
private double CosineSimilarity(float[] a, float[] b)
{
double dot = 0, normA = 0, normB = 0;
for(int i=0;i<a.Length;i++)
{
dot += a[i] * b[i];
normA += a[i] * a[i];
normB += b[i] * b[i];
}
return dot / (Math.Sqrt(normA) * Math.Sqrt(normB));
}
8. Angular Integration
8.1 Angular Service
job-matching.service.ts
@Injectable({ providedIn: 'root' })
export class JobMatchingService {
constructor(private http: HttpClient) {}
getMatchesForCandidate(id: number): Observable<JobMatchResult[]> {
return this.http.get<JobMatchResult[]>(`/api/matching/match-candidate/${id}`);
}
}
export interface JobMatchResult {
jobId: number;
jobTitle: string;
score: number;
}
8.2 Angular Component
candidate-matches.component.ts
@Component({
selector: 'app-candidate-matches',
templateUrl: './candidate-matches.component.html'
})
export class CandidateMatchesComponent implements OnInit {
displayedColumns = ['jobTitle', 'score'];
dataSource = new MatTableDataSource<JobMatchResult>();
constructor(private service: JobMatchingService) {}
ngOnInit() {
this.service.getMatchesForCandidate(1).subscribe(res => {
this.dataSource.data = res;
});
}
}
HTML template:
<mat-card>
<h2>Top Job Matches</h2>
<table mat-table [dataSource]="dataSource">
<ng-container matColumnDef="jobTitle">
<th mat-header-cell *matHeaderCellDef> Job Title </th>
<td mat-cell *matCellDef="let row">{{ row.jobTitle }}</td>
</ng-container>
<ng-container matColumnDef="score">
<th mat-header-cell *matHeaderCellDef> Score </th>
<td mat-cell *matCellDef="let row">{{ row.score | number:'1.0-3' }}</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
</mat-card>
9. Recommended AI Enhancements
9.1 Skill Gap Analysis
Identify missing skills compared to job requirements.
9.2 Job Recommendations
Recommend alternative jobs if match score is low.
9.3 Candidate Ranking
Rank candidates for each job.
9.4 Resume Summarization
Use LLMs to generate:
Profile summary
Skill summary
Experience summary
9.5 Interview Question Generation
Automatically prepare questions based on job skills.
10. Candidate Dashboard (Angular)
A modern candidate dashboard includes:
Upload resume
View parsed resume data
View skill extraction
See top job matches
Track application status
You can build this with:
Angular Material
MatTable
MatStepper
MatCard
NgCharts
11. HR Dashboard (Angular)
HR dashboard shows:
Use Angular Material and charts for this.
12. Performance Considerations
Do not compute embeddings repeatedly. Store vectors.
Vector size is large. Use VARBINARY(MAX) and store compressed.
Use batch matching.
Cache results.
Use async operations for prediction APIs.
Offload ML computation to background workers.
13. Security and Compliance
Encrypt resumes in storage
Remove personal data before embedding
Use secure HTTPS connections
Restrict access to HR-only APIs
Log AI decisions for transparency
14. Scaling the System
To scale an AI job portal:
Option A: Microservices
Separate:
Resume parsing
Embedding generation
Matching service
Notification service
Option B: Vector Databases
Use:
Option C: Distributed Processing
Use workers for handling bulk resumes.
15. Deployment Strategy
Deployment Sequence
SQL Server on Azure or on-prem
ASP.NET Core on Azure App Service
Angular app on Static Web App or App Service
ML microservice on Azure Container Apps
Background jobs on Azure Functions
Conclusion
Building an AI-powered job portal with resume matching is not only achievable but highly practical for modern businesses. With the right integration of SQL Server, ASP.NET Core, Angular, and AI models, you can deliver a system that:
Reads and understands resumes
Extracts important skills
Generates embeddings for powerful text matching
Compares candidates and jobs using cosine similarity
Ranks applicants based on fit
Provides dashboards for HR teams and candidates
Automates a major part of recruitment
This guide walked through:
With these building blocks, you can deliver a real, production-grade job matching solution.