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Senior Backend Developer

Proten International
Lagos Posted Oct 9, 2026
On-siteNGN 1,500,000 - 1,800,000 / year

About this role

Senior Backend Developer

Proten International\u2022Lagos full time\u20a0\u20a01.5M  1.8M/yr On-site\u2028senior level Posted 6 days ago

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Description

Requirements

  • CompanyBenefits

  • Job Description

  • The Senior Backend Developer will be responsible for designing, developing, maintaining, and optimizing robust backend applications and database systems. The role requires strong hands-on expertise in C#, VB.NET, ASP.NET, .NET Core, Blazor Web App, ASP.NET Web Forms, and Microsoft SQL Server (MSSQL).

  • The successful candidate will develop reliable, secure, scalable, and high-performing applications, maintain existing systems, troubleshoot technical issues, and collaborate with relevant teams to deliver quality software solutions aligned with business requirements.

Key Responsibilities

    1. Backend Development and Application Engineering

  • Design, develop, test, and maintain backend applications using C#, VB.NET, ASP.NET, and .NET Core.

  • Build and maintain web applications using Blazor Web App and ASP.NET Web Forms.

  • Develop reusable, maintainable, and efficient code in line with established coding standards and software development best practices.

  • Translate business and technical requirements into functional software solutions.

  • Maintain and enhance existing applications while ensuring compatibility, reliability, and performance.

  • Identify opportunities to improve application architecture, code quality, and system efficiency.

    1. Database Management and Optimization

  • Design, develop, maintain, and optimize databases using Microsoft SQL Server (MSSQL).

  • Write and optimize SQL queries, stored procedures, functions, and database scripts.

  • Ensure data integrity, consistency, security, and efficient retrieval.

  • Troubleshoot database-related issues and improve query performance.

  • Support database maintenance, backup, recovery, and performance monitoring in collaboration with relevant teams.

    1. Application Maintenance and Troubleshooting

  • Diagnose, investigate, and resolve complex application defects, performance issues, and system errors.

  • Conduct code reviews, debugging, testing, and performance optimization.

  • Maintain and improve legacy applications, including systems built with ASP.NET Web Forms and VB.NET.

  • Implement fixes, updates, and enhancements while minimizing disruption to business operations.

  • Document technical issues, resolutions, system changes, and application configurations.

    1. System Integration and Performance

  • Develop and maintain application components and integrations required for effective communication between systems.

  • Ensure applications are responsive, reliable, scalable, and capable of supporting business needs.

  • Apply appropriate security practices to protect application functionality and data.

  • Identify and address performance bottlenecks across backend services and database operations.

  • Support the deployment, configuration, and ongoing maintenance of applications.

    1. Testing and Quality Assurance

  • Develop and execute unit tests and other relevant technical tests to validate application functionality.

  • Identify and resolve defects before deployment.

  • Ensure code meets defined quality, security, maintainability, and performance standards.

  • Participate in technical reviews and contribute to continuous improvement of development processes.

  • Provide technical support during user acceptance testing and production releases where required.

    1. Collaboration and Technical Documentation

  • Work with frontend developers, software engineers, business analysts, quality assurance personnel, and other stakeholders to deliver integrated solutions.

  • Participate in requirements analysis, technical planning, and solution design.

  • Provide technical guidance and support to other developers where necessary.

  • Prepare and maintain clear documentation covering application architecture, database structures, code changes, and system procedures.

  • Communicate technical issues, progress, and proposed solutions effectively.

  • Requirements & Qualifications

  • Bachelor’s degree or HND in Computer Science, Software Engineering, Information Technology, Computer Engineering, or a related discipline.

  • Relevant professional certifications or additional technical training will be an advantage.

  • Minimum of 10 years’ professional experience in backend development.

  • Demonstrable hands-on experience developing and maintaining applications using C#, VB.NET, ASP.NET, and .NET Core.

  • Practical experience with Microsoft SQL Server (MSSQL) database development and optimization.

  • Experience working with both modern .NET applications and legacy ASP.NET Web Forms systems.

  • A strong track record of troubleshooting complex software issues and delivering reliable application solutions.

  • Required Technical Skills

  • Database: Microsoft SQL Server (MSSQL), SQL queries, stored procedures, database design, and performance optimization.

  • Programming Languages: C# and VB.NET.

  • Frameworks: ASP.NET and .NET Core.

  • Platforms and Technologies: Blazor Web App and ASP.NET Web Forms.

  • Software Engineering: Object-oriented programming, debugging, testing, code optimization, application maintenance, and technical documentation.

  • Problem-Solving: Ability to investigate complex technical issues and implement effective, sustainable solutions.

  • Frequently Asked Questions

  • Common questions about applying and the hiring process

  • How do I know if my application was received?

  • Can I apply with just my profile, or do I need a resume?

  • How long does the hiring process typically take?

  • What happens if I don't hear back?

  • Can I withdraw my application?

  • Is my personal information shared with the employer?

  • Hiring Process

    1. Application Review

  • We review your profile and application.

    1. Initial Interview

  • A quick call to discuss the role & your goals.

    1. Technical Assessment

  • Deep dive into your skills & experience.

    1. Final Decision

  • Offer extended to successful candidates.

  • Interested in this role?

  • Join thousands of candidates who found their dream job on our platform.

  • Apply Now

  • Senior Backend Developer

  • Proten International

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