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Lazar Janosevic
Verified Expert in Engineering
Software Engineer and Developer
Toronto, ON, Canada
Toptal member since November 3, 2025
Bio
Lazar is a senior software engineer and architect with over 20 years of experience designing, developing, and delivering complex enterprise applications across the banking, education, and government sectors. Drawing on deep expertise in the .NET ecosystem, Azure, Angular, and modern DevOps practices, he combines strong architectural vision with proven leadership. Lazar is an accomplished technical leader with expertise in managing the full software development lifecycle (SDLC).
Portfolio
Pathways to Education
Azure, .NET Core, Microsoft SQL Server, TypeScript, RESTFul APIs...
Uniondome
C#, .NET Core, REST, Windows, Azure, SQL, Angular, TypeScript, Cloud...
RBC Ventures
C#, .NET Core, REST, PostgreSQL, Cloud, System Integration, Unit Testing...
Experience
- Software Engineering - 20 years
- APIs - 20 years
- .NET - 20 years
- SQL - 20 years
- Software Architecture - 20 years
- TypeScript - 11 years
- Angular - 11 years
- Azure - 7 years
Preferred Environment
.NET, Azure, Angular, SQL, JavaScript, TypeScript, APIs, NoSQL, C#, React, Windows, Windows Desktop
The most amazing...
...achievement has been driving the development of a nationwide education platform in Canada, modernizing data systems that serve tens of thousands of students.
Work Experience
Team Lead and Software Architect
2022 - PRESENT
Pathways to Education
- Architected and launched the Connex Platform, a nationwide education system on Azure serving tens of thousands of students and enhancing data accessibility and reliability across partner institutions.
- Directed a cross-functional engineering team through the end-to-end SDLC, introducing CI/CD pipelines, automated testing frameworks, and agile delivery practices that reduced release time by over 40% and increased deployment stability.
- Introduced a cloud-native design and modular front-end architecture, enabling independent feature releases and improving maintainability, which reduced technical debt and post-release defects by 30%.
Technologies: Azure, .NET Core, Microsoft SQL Server, TypeScript, RESTFul APIs, Identity Server, Windows, Software Architecture, Software Engineering, .NET, Angular, SQL, APIs, JavaScript, React, C#.NET, Cloud Architecture, Large Language Models (LLMs), Authentication, Authorization, Microsoft Entra, OAuth, CSS, Cypress, React Testing Library, Webpack, CSS3, HTML5, Node.js, Test-driven Development (TDD), Web Performance Optimization (WPO), Architecture, Event-driven Systems, .NET 10, Enterprise Architecture, Artificial Intelligence (AI), Technical Leadership, .NET Framework, Stored Procedure, API Integration, Full-stack Development, Agentic AI, Claude, Anthropic, OpenAI, Microservices, ASP.NET Web API, Microservices Architecture, Azure App Service, Azure Blob Storage, Azure SQL, RESTful Microservices, Event-driven Architecture, GraphQL, Entity Framework
Technology Principal/Senior Full-stack Developer
2021 - 2022
Uniondome
- Developed and launched a cloud-based enterprise platform from the ground up using C# and .NET Core, supporting secure, role-based access and scalable business workflows.
- Designed and implemented RESTful APIs and back-end services integrated with SQL Server and Azure infrastructure, ensuring reliability, performance, and maintainability.
- Led and mentored a cross-functional development team, defined system architecture, enforced coding standards, and oversaw end-to-end delivery from design to production.
Technologies: C#, .NET Core, REST, Windows, Azure, SQL, Angular, TypeScript, Cloud, System Design, CI/CD Pipelines, Software Architecture, Software Engineering, .NET, APIs, JavaScript, C#.NET, Cloud Architecture, Large Language Models (LLMs), Authentication, Authorization, CSS, Webpack, CSS3, HTML5, Node.js, Web Performance Optimization (WPO), Architecture, Docker, Event-driven Systems, Kubernetes, .NET 10, xUnit, Enterprise Architecture, Technical Leadership, .NET Framework, Stored Procedure, API Integration, Full-stack Development, Microservices, ASP.NET Web API, Microservices Architecture, Azure App Service, Azure Blob Storage, Azure SQL, RESTful Microservices, Event-driven Architecture, Entity Framework
Senior Software Engineer
2020 - 2021
RBC Ventures
- Developed UI, back-end services, and APIs using Angular, C#, and .NET Core for a high-traffic consumer platform within RBC Ventures, supporting secure and scalable financial workflows.
- Integrated third-party services and internal systems via RESTful APIs, ensuring data consistency, reliability, and compliance with enterprise security standards.
- Improved system stability and code quality by contributing to automated testing, performance optimization, and production issue resolution in a regulated financial environment.
Technologies: C#, .NET Core, REST, PostgreSQL, Cloud, System Integration, Unit Testing, API Design, Software Architecture, Software Engineering, .NET, Angular, SQL, TypeScript, APIs, Azure, JavaScript, C#.NET, Cloud Architecture, Authentication, Authorization, CSS, Webpack, CSS3, HTML5, Node.js, Test-driven Development (TDD), Web Performance Optimization (WPO), Architecture, Docker, Event-driven Systems, xUnit, Enterprise Architecture, Amazon Web Services (AWS), .NET Framework, ASP.NET Core, API Integration, Full-stack Development, MongoDB, Microservices, ASP.NET Web API, Microservices Architecture, Azure App Service, Azure Blob Storage, Azure SQL, RESTful Microservices, Event-driven Architecture, Entity Framework, Vue, Nuxt.js
Senior Software Engineer
2018 - 2020
TD Bank Group
- Developed and maintained enterprise-grade back-end services using Angular, C#, and .NET for internal banking and securities platforms, supporting mission-critical financial operations.
- Designed and integrated RESTful APIs and data access layers with SQL Server, ensuring performance, reliability, and adherence to enterprise security standards.
- Collaborated with cross-functional teams to modernize existing systems, resolve production issues, and improve long-term maintainability within a large-scale financial institution.
Technologies: Angular, System Integration, Unit Testing, API Development, .NET Core, Software Architecture, Software Engineering, TypeScript, APIs, SQL, JavaScript, C#.NET, Authentication, Authorization, CSS, Webpack, CSS3, HTML5, Node.js, RxJS, Test-driven Development (TDD), Web Performance Optimization (WPO), Architecture, Event-driven Systems, Enterprise Architecture, .NET Framework, Stored Procedure, API Integration, Full-stack Development, Apache Kafka, Microservices, ASP.NET Web API, Microservices Architecture, RESTful Microservices, Entity Framework
Senior Software Engineer
2014 - 2018
Ontario Ministry of Education (Government of Ontario)
- Developed and maintained large-scale government systems using Angular, C#, and ASP.NET to support education funding, student information, and regulatory reporting across Ontario.
- Designed and integrated secure back-end services and RESTful APIs with SQL Server and Oracle databases, ensuring data integrity, auditability, and compliance with public-sector standards.
- Contributed to modernization initiatives by improving system architecture, performance, and maintainability for long-lived applications used by multiple government agencies and institutions.
Technologies: AngularJS, C#, ASP.NET, .NET Core, Angular, Oracle, Reports, Enterprise Security, System Integration, Software Architecture, Software Engineering, .NET, SQL, TypeScript, APIs, JavaScript, C#.NET, VB.NET, Authentication, Authorization, CSS, HTML5, Web Content Accessibility Guidelines (WCAG), Web Performance Optimization (WPO), Architecture, Event-driven Systems, Visual Basic, Enterprise Architecture, .NET Framework, IIS, Visual Basic .NET (VB.NET), Internet Information Services (IIS), VB.NET WinForms, ASP.NET Web Forms, Stored Procedure, Microsoft Power BI, ASP.NET Core, API Integration, Full-stack Development, Microservices, ASP.NET Web API, Entity Framework, Vue, Nuxt.js
Senior Software Engineer
2010 - 2014
Lanworks
- Developed enterprise applications and workflow automation solutions using Symantec Workflow, C#, and ASP.NET for large organizations, supporting asset management, incident management, and HR processes.
- Integrated multiple enterprise platforms and systems through SOAP-based services, reporting tools, and database-driven workflows to streamline business operations.
- Delivered consulting solutions across multiple clients, translating complex business requirements into reliable, maintainable software in enterprise IT environments.
Technologies: Symantec, SQL, Oracle, C#, SOAP, BPA, Business Process Automation, ASP.NET, Software Architecture, Software Engineering, .NET, APIs, C#.NET, CSS, Architecture, Event-driven Systems, .NET Framework, IIS, Internet Information Services (IIS), ASP.NET Web Forms, Stored Procedure, Manufacturing, API Integration, Full-stack Development, C#.NET WinForms, Windows Forms (WinForms), ASP.NET Web API, Entity Framework
Team Lead/Senior Software Engineer
2008 - 2010
Open Technologies Visual
- Led development of enterprise B2B platforms using C# and ASP.NET for international clients, delivering scalable systems used across multiple countries.
- Designed and implemented Windows-based applications and rich client interfaces using WPF and SQL Server, supporting complex business workflows and reporting.
- Managed a development team, defined system architecture, coordinated delivery milestones, and ensured quality and maintainability of long-lived enterprise solutions.
Technologies: C#, ASP.NET, SQL, WPForms, Windows Desktop, System Architecture, Enterprise Integration, Software Architecture, Software Engineering, .NET, APIs, C#.NET, CSS, Architecture, .NET Framework, IIS, Internet Information Services (IIS), Desktop App Development, ASP.NET Web Forms, Stored Procedure, Full-stack Development, C#.NET WinForms, Windows Forms (WinForms), Entity Framework
Software Engineer
2005 - 2008
Spinnaker (ComTrade Group)
- Developed Windows desktop and web applications using C# and the .NET Framework for government and enterprise clients, supporting critical administrative and regulatory processes.
- Built and integrated Windows-based systems with SQL Server databases and legacy components using Windows APIs and COM/DCOM technologies.
- Contributed to large-scale government projects by implementing reliable, maintainable software solutions designed for long-term use and strict data integrity requirements.
Technologies: C#, .NET Framework, Windows Desktop, Windows API, SQL, COM, DCOM, UML, System Integration, Software Architecture, Software Engineering, .NET, APIs, C#.NET, CSS, IIS, Internet Information Services (IIS), Desktop App Development, ASP.NET Web Forms, Stored Procedure, Full-stack Development, C#.NET WinForms, Windows Forms (WinForms)
Software Engineer
2003 - 2005
SCube
- Developed Windows desktop applications using C# and the .NET Framework for transportation and media organizations, supporting core operational and accounting workflows.
- Implemented data-driven desktop systems integrated with SQL Server, ensuring reliability, performance, and accuracy for business-critical processes.
- Contributed to full application lifecycle activities, including requirements analysis, system design, development, and maintenance of long-lived Windows-based solutions.
Technologies: C#, .NET Framework, Windows Desktop, Windows API, SQL, System Design, UML, Software Architecture, Software Engineering, .NET, APIs, C#.NET, IIS, Internet Information Services (IIS), Desktop App Development, ASP.NET Web Forms, Stored Procedure, Full-stack Development, C#.NET WinForms, Windows Forms (WinForms)
Experience
Uniondome Platform
https://uniondome.com/I co-founded and led the technical development of a SaaS platform for document collaboration and workflow automation. I defined the cloud architecture, developed core modules, and managed the full software development lifecycle. I delivered a production-ready MVP with multi-tenant support and role-based access control, positioning the product for B2B adoption.
Government Registry & Compliance Platform (Windows → Enterprise Modernization)
Designed and implemented a mission-critical government registry system used to manage regulated business entities and administrative workflows. The solution included Windows desktop applications built in C#, deep integration with Windows APIs, and back-end services connected to SQL Server databases.
The system was designed for long-term reliability, data integrity, and auditability, supporting strict regulatory requirements and high data accuracy. It was deployed across multiple government offices and used daily by administrative staff.
The system was designed for long-term reliability, data integrity, and auditability, supporting strict regulatory requirements and high data accuracy. It was deployed across multiple government offices and used daily by administrative staff.
Enterprise Workflow Automation & Integration Platform
Delivered an enterprise workflow automation platform designed to streamline IT service management, HR, and operational processes across large organizations. The system automated approvals, notifications, reporting, and cross-system data synchronization.
The solution integrated multiple enterprise systems using API and service-based architectures, enabling organizations to reduce manual work and improve process consistency.
The solution integrated multiple enterprise systems using API and service-based architectures, enabling organizations to reduce manual work and improve process consistency.
MoveSnap (RBC Ventures)
MoveSnap is a consumer-facing digital platform developed within RBC Ventures to help users plan and manage residential moves. The platform supports high user traffic and integrates multiple external services while operating under enterprise security and quality standards.
I contributed to the design and implementation of UI and back-end services using Angular, C#, and .NET Core, building RESTful APIs and integrating third-party providers. The work focused on scalability, reliability, and maintainability within a regulated financial environment.
I contributed to the design and implementation of UI and back-end services using Angular, C#, and .NET Core, building RESTful APIs and integrating third-party providers. The work focused on scalability, reliability, and maintainability within a regulated financial environment.
Education
2008 - 2010
Master of Science Degree in Computer Science
University of Belgrade - Belgrade, Serbia
1997 - 2004
Bachelor of Science Degree in Computer Science
University of Belgrade - Belgrade, Serbia
Skills
Libraries/APIs
Windows API, Windows Forms (WinForms), Entity Framework, React, React Testing Library, Node.js, RxJS, Vue, API Development
Tools
Git, C#.NET WinForms, Azure App Service, Claude, Microsoft Copilot, Webpack, xUnit, Microsoft Power BI
Languages
SQL, TypeScript, C#, C#.NET, CSS, Stored Procedure, JavaScript, VB.NET, CSS3, HTML5, Visual Basic, Visual Basic .NET (VB.NET), GraphQL, UML
Frameworks
.NET, Angular, .NET Core, ASP.NET, ASP.NET Web Forms, ASP.NET Web API, Cypress, VB.NET WinForms, ASP.NET Core, Nuxt.js, AngularJS
Paradigms
REST, Web Performance Optimization (WPO), Desktop App Development, Microservices, Microservices Architecture, Event-driven Architecture, Test-driven Development (TDD), DevOps, Unit Testing
Platforms
Windows, Windows Desktop, Azure, Oracle, Docker, Kubernetes, Amazon Web Services (AWS), Apache Kafka, Xamarin
Storage
Microsoft SQL Server, PostgreSQL, Azure SQL, MongoDB, NoSQL
Industry Expertise
Enterprise Security
Other
APIs, Software Engineering, RESTFul APIs, Software Architecture, Software Development, Back-end, Debugging, .NET Framework, Cloud Architecture, Large Language Models (LLMs), Architecture, Event-driven Systems, .NET 10, Enterprise Architecture, Artificial Intelligence (AI), Technical Leadership, IIS, Internet Information Services (IIS), Full-stack Development, Azure Blob Storage, RESTful Microservices, Identity Server, CI/CD Pipelines, Cloud, Cloud Infrastructure, Authentication, Authorization, Microsoft Entra, OAuth, Web Content Accessibility Guidelines (WCAG), Manufacturing, Agentic AI, Anthropic, OpenAI, DocumentDB, System Design, System Integration, API Design, Reports, Symantec, SOAP, BPA, Business Process Automation, WPForms, System Architecture, Enterprise Integration, COM, DCOM, Symantec Workflow, API Integration
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