Senior Full-Stack Developer (.NET based)

CapTech; Philadelphia (Philadelphia County); Hybrid; USD 110,000 - 140,000; Full time

Benefits offered by this job

CapFlex – remote/hybrid flexibility

Learning & Development – certification

Modern Health

Carrot Fertility

Fringe – lifestyle benefits stipend

Employee Resource Groups

Philanthropic Partnerships

401(k) Matching

Health coverage

Disability insurance

Paid family leave

PTO

Job summary

CapTech is a U.S.-based consulting firm delivering enterprise-scale software projects. We design, develop and deliver high-quality systems, including API-driven architectures, microservices, cloud deployments, and front-end portals.

This role focuses on full-stack development with .NET, ASP.NET MVC, RESTful APIs, and modern front-end frameworks. You’ll collaborate with clients and engineers to create scalable solutions and mentor junior developers.

Qualifications

• 4+ years of experience in designing and developing applications using .Net Framework 4.7 to .Net Core 3.1.
• Proven web development experience with ASP.NET MVC, C#, and Entity Framework.
• RESTful API development using Web API and Swagger.
• Database development with SQL Server, Azure Cosmos, or MongoDB.
• Frontend development with JavaScript, CSS, and libraries like Angular, Bootstrap, Vue, or React.
• Experience with Visual Studio or Visual Studio Code.
• Experience with AI development tools including Claude, CodeX, OpenClaude and AI orchestration.
• Knowledge of source control (Git) and collaborative workflows.
• Familiarity with multi-system integrations, distributed systems, and enterprise integration challenges.
• Strong problem-solving, performance tuning, and scalable design skills.

Responsibilities

• Collaborate with team members and clients to deliver a technical solution that meets the unique needs of our clients.
• Create quality deliverables to communicate technical solutions to appropriate audiences.
• Leverage CapTech’s internal programs and self-directed training to continually develop industry-relevant knowledge and skills.
• Understand and implement object-oriented design patterns.
• Communicate effectively to team members with varying degrees of technical knowledge.
• Provide technical mentoring.

Skills

NET Framework/Core

ASP.NET MVC

C#

Entity Framework

RESTful API

Web API/Swagger

SQL Server

Azure Cosmos / MongoDB

JavaScript

CSS

Angular

Bootstrap

Vue

React

Visual Studio

Visual Studio Code

Claude / CodeX / OpenClaude

AI orchestration

Git

Distributed systems

System integrations

Performance tuning

Tools

Agentic AI development

AI toolset: Claude, CodeX, OpenClaude

Job description

CapTech is a team of master builders, creators, and problem solvers who help clients grow efficient, successful businesses. We unite diverse skills and perspectives to transform how data, systems, and ingenuity enable each client to advance what’s possible in a changing world.

As perceptive partners, our U.S-based consultants find inspiration in the unknown and enjoy getting our hands dirty solving our clients’ myriad of challenges. Across industries and business goals, we fuse technical depth and analytical prowess with creative savvy to move clients forward. This drive helps each organization use technology, management, and insight to turn ideas into action. Together, we create outcomes that exceed the expected — which is one of the reasons we’ve been on the Inc. 500/5000 list for over a decade.

Job Description

Full-Stack Developers at CapTech are part of a capable, highly-motivated community who strive to continuously learn the latest tools and architectures to deliver innovative solutions for our clients. We design, develop, and deliver high-quality enterprise systems, as well as systems integrations and work in a project-based consulting environment.

CapTech developers enjoy a collaborative environment and have many opportunities to learn from and share knowledge with other developers, architects, and our clients. Our solutions include API-driven clients, microservice architectures, event-driven integrations, cloud deployments, serverless applications, and web and portal front ends.

Responsibilities

• Collaborate with team members and clients to deliver a technical solution that meet the unique needs of our clients
• Create quality deliverables to communicate technical solutions to appropriate audiences
• Leverage CapTech’s internal programs and self-directed training to continually develop industry relevant knowledge and skills
• Understand and implement object-oriented design patterns
• Communicate effectively to team members with varying degrees of technical knowledge
• Provide technical mentoring

Qualifications

Specific qualifications for the .NET Engineer position include:

• 4+ years of experience in Solution, Design and Development of applications using .Net Framework 4.7 - .Net Core 3.1
• Demonstrated experience in Web development using ASP.NET MVC, C#, and the Entity Framework
• RESTful API development using Web API and Swagger
• Database development including SQL Server, Azure Cosmos, or Mongo DB
• Front end development using JavaScript, CSS, and popular libraries including Angular, Bootstrap, Vue, or React
• Comprehensive experience using Visual Studio or Visual Studio Code
• Experience with Agentic AI development- Developing agents and developing with agents
• Experience with a Varied AI Toolset- Claude code, CodeX, Opencode, OpenClaude
• Preferred experience with AI orchestration
• Experience with source control systems (e.g., Git) and collaborative development workflows
• Familiarity with multi-system integrations, distributed systems, and common enterprise integration challenges
• Solid understanding of application performance tuning, scalability, and optimization techniques
• Ability to clearly communicate technical concepts, designs, and solutions to both technical and non-technical stakeholders
• Strong problem-solving skills and a commitment to clean, maintainable, and well-documented code

Additional Information

We want everyone at CapTech to be able to envision a lasting and rewarding career here, which is why we offer a variety of career paths based on your skills and passions. You decide where and how you want to develop, and we help get you there with customizable career progression and a comprehensive benefits package to support you along the way. Alongside our suite of traditional benefits encompassing generous PTO, health coverage, disability insurance, paid family leave and more, we’ve launched extended benefits to help meet our employees’ needs.

• CapFlex – Employee-first mentality that supports a remote and hybrid workforce and empowers daily flexibility while servicing our clients
• Learning & Development – Programs offering certification and tuition support, digital on-demand learning courses, mentorship, and skill development paths

• Modern Health –A mental health and well-being platform that provides 1:1 care, group support sessions, and self-serve resources to support employees and their families through life’s ups and downs
• Carrot Fertility –Inclusive fertility and family-forming coverage for all paths to parenthood – including adoption, surrogacy, fertility treatments, pregnancy, and more – and opportunities for employer-sponsored funds to help pay for care
• Fringe –A company paid stipend program for personalized lifestyle benefits, allowing employees to choose benefits that matter most to them – ranging from vendors like Netflix, Spotify, and GrubHub to services like student loan repayment, travel, fitness, and more
• Employee Resource Groups – Employee-led committees that embrace and incorporate diversity and inclusion into our day-to-day operations
• Philanthropic Partnerships – Opportunities to engage in partnerships and pro-bono projects that support our communities.
• 401(k) Matching – Generous matching and no vesting period to help you continue to build financial wellness

CapTech is an equal opportunity employer committed to fostering a culture of equality, inclusion and fairness — each foundational to our core values. We strive to create a diverse environment where each employee is encouraged to bring their unique ideas, backgrounds and experiences to the workplace. For more information about our Diversity, Inclusion and Belonging efforts, click HERE.

At this time, CapTech cannot transfer nor sponsor a work visa for this position. Applicants must be authorized to work directly for any employer in the United States without visa sponsorship.

JB1

Hybrid