Senior Full-Stack .NET Developer (Security & Modernization)

EPAM Systems; Brasil; Remote; BRL 180,000 - 300,000; Full time

Benefits offered by this job

Healthcare benefits

Employee learning programs

Paid time off

Upskilling and certification courses

LinkedIn Learning access

Global career opportunities

Volunteer opportunities

Employee Groups

Job summary

EPAM Systems in Brazil is seeking a Senior Full-Stack .NET Developer to remediate security vulnerabilities, modernize legacy apps, and build secure .NET Core services for global clients.

You will maintain ASP.NET Web Forms, MVC, WCF, and ASMX code while advancing REST APIs, front-end with HTML, CSS and modern JS frameworks, and collaborate with DevOps for secure CI/CD.

Qualifications

• 3+ years of full-stack .NET development experience.
• Expertise in C#, .NET Framework, and SQL Server.
• Proficiency in ASP.NET Web Forms and MVC.
• Background in .NET 6/8+, ASP.NET Core, and REST APIs.
• Understanding of dependency injection and secure coding practices.
• Practical security experience and OWASP Top 10 knowledge.
• Experience with React, Angular, or Vue.js.
• English proficiency at Upper-Intermediate level (B2) or higher.

Responsibilities

• Investigate and remediate security vulnerabilities per OWASP Top 10.
• Maintain and modernize legacy ASP.NET Web Forms, MVC, WCF, and ASMX applications.
• Develop and enhance ASP.NET Core Web APIs and modern .NET services.
• Work with SQL Server using ADO.NET, EF Core or Dapper for secure data access.
• Support frontend development using HTML, CSS, JavaScript/TypeScript, jQuery, and modern SPA frameworks.
• Collaborate with DevOps to support secure CI/CD and production deployments.

Skills

C#

ASP.NET Web Forms

ASP.NET MVC

REST APIs

.NET Core

Security

OWASP Top 10

JavaScript

TypeScript

React

Angular

Vue.js

SQL Server

IIS

Tools

TeamCity

Octopus Deploy

IIS

SQL Server

EF Core

Dapper

ADO.NET

OAuth2

OIDC

JWTs

Job description

We are looking for a Senior Full-Stack .NET Developer experienced with both legacy .NET Framework and modern .NET (.NET 6/8+). The primary focus is security vulnerability remediation, legacy application support, and modernization.ResponsibilitiesInvestigate and remediate application security vulnerabilities, including OWASP Top 10, SAST/DAST findings, SQL injection, XSS, and dependency risksMaintain and modernize legacy ASP.NET Web Forms, MVC, WCF, and ASMX applicationsDevelop and enhance ASP.NET Core Web APIs and modern .NET servicesWork with SQL Server, ADO.NET, EF Core/Dapper, ensuring secure data accessSupport frontend development using HTML, CSS, JavaScript/TypeScript, jQuery, and modern SPA frameworksCollaborate with DevOps to support secure CI/CD and production deploymentsRequirements3+ years of full-stack .NET development experienceExpertise in C#, .NET Framework, and SQL ServerProficiency in ASP.NET Web Forms and MVCBackground in .NET 6/8+, ASP.NET Core, and REST APIsUnderstanding of dependency injectionPractical application security experience and knowledge of OWASP Top 10Experience with React, Angular, or Vue.jsStrong troubleshooting skills and ability to work with large legacy codebasesEnglish proficiency at an Upper-Intermediate level (B2) or higherNice to haveExperience with TeamCity, Octopus Deploy, and IISKnowledge of OAuth2, OIDC, and JWTSkills in HTML, CSS, and jQueryWe offerInternational projects with top brandsWork with global teams of highly skilled, diverse peersHealthcare benefitsEmployee financial programsPaid time off and sick leaveUpskilling, reskilling and certification coursesUnlimited access to the LinkedIn Learning library and 22,000+ coursesGlobal career opportunitiesVolunteer and community involvement opportunitiesEPAM Employee GroupsAward-winning culture recognized by Glassdoor, Newsweek and LinkedInEPAM is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, sexual orientation, gender identity or expression, disability, protected veteran status, or any other characteristic protected by applicable law.