Senior Fullstack Engineer (react/.net)
3PILLAR GLOBAL Company
3Pillar is an AI transformation partner on a mission to help enterprises build the AI-native products and intelligent agents that will define the next era of business. With teams across North America, Europe, Latin America, and Asia, we work with the most ambitious companies in financial services, healthcare, media, and technology — helping them move faster, modernize boldly, and compete on their own terms. Our HelixAI platform and Helix Pods delivery model put our engineers at the center of real agentic transformation — doing work that is open, portable, and built to last. We are building the future of enterprise AI.
We work with clients to build incredible innovative products as their development partner whose solutions drive rapid revenue, market share, and customer growth for industry leaders in Software and SaaS, Media and Publishing, Information Services, and Retail. Our key differentiator is our Product Mindset and Lightwave Methodology. Our development teams focus on building for outcomes and all of our team members around the globe are trained on the Product Mindset’s core values – Minimize Time to Value, Solve for Need, and Excel at Change. Our teams apply this mindset to build digital products that are customer-facing and revenue-generating. Our business-minded approach to agile development ensures that we align to client goals from the earliest conceptual stages through market launch and beyond.
WHAT WE BELIEVE
At 3Pillar, our core values – Intrinsic Dignity, Outsized Impact, Open Collaboration, and Continuous Improvement – drive our commitment to providing best in class product development services to high growth businesses across the globe. We’ve spent more than fifteen years building innovative software solutions. Our executive team has always held our values to the highest standard which has led to active participation on the Forbes Tech Council, a winner of the Ernst & Young Entrepreneur of the Year Award, and a spot on the Washington Business Journal’s Women Who Mean Business list.
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Key Responsibilities:
Independently guide the technical direction and implementation by the whole team within defined architecture in all stages from conceptualization to deployment.
Evaluate trade-offs between correctness, robustness, performance, and customer impact to ensure the development of the right solution, with client success at the forefront.
Create and lead the team's technical documentation and repository management practices, including tasks such as creating branches, pull requests, merges, etc.
Collaborate with product, design, and engineering teams to provide necessary oversight of architecture and dependencies influencing product strategy and direction.
Contribute to code reviews, documentation, and addressing complex bug fixes with a focus on security, performance, and reliability.
Mentoring Junior Engineers on project teams, supporting the growth of technical capabilities.
Minimum Qualifications:
A minimum of 5+ years of experience/expertise working as a Full Stack Engineer, with proficiency in the specified technologies.
React
.Net Core (C#)
Azure (good to have)
High level of English proficiency required to interact with a globally-based development team.
Strong proficiency in ReactJS and modern frontend development practices:
Deep knowledge of React hooks, context, state management (Redux / Zustand / Recoil).
Advanced CSS skills — layouts, responsive design, CSS-in-JS, design tokens.
Experience with modern build tools (Vite, Webpack) and testing libraries (Jest, React Testing Library).
Deep expertise in ReactJS and modern frontend workflows. Proficient in styling and layout using advanced CSS.
Solid experience developing backend services and RESTful / GraphQL APIs (optional) using .NET Core / .NET 6+ (C#):
Proficiency in C# language features, async/await patterns, and middleware pipelines.
Good understanding of clean architecture, SOLID principles, and design patterns.
Write clean, maintainable code across the full stack (ReactJS, C#, SQL Server, and advanced CSS).
Follows strict quality standards by designing and writing comprehensive test cases to ensure structural and functional integrity.
Good working experience with SQL Server, modelling and Stored Procedures.
Set the technical direction and orchestrate implementation strategies across development teams to ensure alignment with overall product goals.
Architect and design scalable, resilient, and secure enterprise-level systems using .NET Core, ReactJS, and Azure.
Demonstrated experience following and adapting high-level architecture to project and client needs.
Ability to verify/validate architecture implementations and influence overall architecture beyond the team.
Experience in the medical domain will be an advantage.
Demonstrated initiative in mentoring other engineers and decision-makers throughout the organization.
Very good knowledge of architectural styles and design patterns, SOLID principles and OWASP.
Additional Experience Desired:
Collaborate with Tech Leads and Architects to translate high-level design into implementation-ready tasks.
Experience working in Agile / Scrum teams, participating in sprint ceremonies and backlog refinement.
Experience in building CI/CD pipelines.
Ability to refine and clarify technical details (including definition of done) based on internal or external PO for User Stories and task assignments.
Ability to provide technical orchestration among the overall tasks.
Knowledge of building Cloud Native applications.
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3Pillar is an AI transformation partner on a mission to help enterprises build the AI-native products and intelligent agents that will define the next era of business. With teams across North America, Europe, Latin America, and Asia, we work with the most ambitious companies in financial services, healthcare, media, and technology — helping them move faster, modernize boldly, and compete on their own terms. Our HelixAI platform and Helix Pods delivery model put our engineers at the center of real agentic transformation — doing work that is open, portable, and built to last. We are building the future of enterprise AI.
We work with clients to build incredible innovative products as their development partner whose solutions drive rapid revenue, market share, and customer growth for industry leaders in Software and SaaS, Media and Publishing, Information Services, and Retail. Our key differentiator is our Product Mindset and Lightwave Methodology. Our development teams focus on building for outcomes and all of our team members around the globe are trained on the Product Mindset’s core values – Minimize Time to Value, Solve for Need, and Excel at Change. Our teams apply this mindset to build digital products that are customer-facing and revenue-generating. Our business-minded approach to agile development ensures that we align to client goals from the earliest conceptual stages through market launch and beyond.
WHAT WE BELIEVE
At 3Pillar, our core values – Intrinsic Dignity, Outsized Impact, Open Collaboration, and Continuous Improvement – drive our commitment to providing best in class product development services to high growth businesses across the globe. We’ve spent more than fifteen years building innovative software solutions. Our executive team has always held our values to the highest standard which has led to active participation on the Forbes Tech Council, a winner of the Ernst & Young Entrepreneur of the Year Award, and a spot on the Washington Business Journal’s Women Who Mean Business list.
\n
Key Responsibilities:
Independently guide the technical direction and implementation by the whole team within defined architecture in all stages from conceptualization to deployment.
Evaluate trade-offs between correctness, robustness, performance, and customer impact to ensure the development of the right solution, with client success at the forefront.
Create and lead the team's technical documentation and repository management practices, including tasks such as creating branches, pull requests, merges, etc.
Collaborate with product, design, and engineering teams to provide necessary oversight of architecture and dependencies influencing product strategy and direction.
Contribute to code reviews, documentation, and addressing complex bug fixes with a focus on security, performance, and reliability.
Mentoring Junior Engineers on project teams, supporting the growth of technical capabilities.
Minimum Qualifications:
A minimum of 5+ years of experience/expertise working as a Full Stack Engineer, with proficiency in the specified technologies.
React
.Net Core (C#)
Azure (good to have)
High level of English proficiency required to interact with a globally-based development team.
Strong proficiency in ReactJS and modern frontend development practices:
Deep knowledge of React hooks, context, state management (Redux / Zustand / Recoil).
Advanced CSS skills — layouts, responsive design, CSS-in-JS, design tokens.
Experience with modern build tools (Vite, Webpack) and testing libraries (Jest, React Testing Library).
Deep expertise in ReactJS and modern frontend workflows. Proficient in styling and layout using advanced CSS.
Solid experience developing backend services and RESTful / GraphQL APIs (optional) using .NET Core / .NET 6+ (C#):
Proficiency in C# language features, async/await patterns, and middleware pipelines.
Good understanding of clean architecture, SOLID principles, and design patterns.
Write clean, maintainable code across the full stack (ReactJS, C#, SQL Server, and advanced CSS).
Follows strict quality standards by designing and writing comprehensive test cases to ensure structural and functional integrity.
Good working experience with SQL Server, modelling and Stored Procedures.
Set the technical direction and orchestrate implementation strategies across development teams to ensure alignment with overall product goals.
Architect and design scalable, resilient, and secure enterprise-level systems using .NET Core, ReactJS, and Azure.
Demonstrated experience following and adapting high-level architecture to project and client needs.
Ability to verify/validate architecture implementations and influence overall architecture beyond the team.
Experience in the medical domain will be an advantage.
Demonstrated initiative in mentoring other engineers and decision-makers throughout the organization.
Very good knowledge of architectural styles and design patterns, SOLID principles and OWASP.
Additional Experience Desired:
Collaborate with Tech Leads and Architects to translate high-level design into implementation-ready tasks.
Experience working in Agile / Scrum teams, participating in sprint ceremonies and backlog refinement.
Experience in building CI/CD pipelines.
Ability to refine and clarify technical details (including definition of done) based on internal or external PO for User Stories and task assignments.
Ability to provide technical orchestration among the overall tasks.
Knowledge of building Cloud Native applications.
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