Senior Full Stack Web Developer Jobs in Leominster, MA

Job Description We are looking for a Senior Full Stack Developer to join our team and take a leading role in the evolution of our internal business solutions and line-of-business web applications. You will start as a hands-on senior engineer, collaborating with product and business stakeholders to deliver features, improve reliability, and refine the architecture. Over time, you will become the technical lead for one or more key solutions, guiding their roadmap, mentoring other engineers, and setting engineering standards. Key Responsibilities * Deliver features end-to-end from requirements through design, implementation, testing, and release. * Develop and maintain ASP.NET Core APIs, business logic, and Blazor UI components. * Design and optimize SQL Server schemas, queries, and data access. * Apply validation, security, and quality standards, including test automation. * Improve architecture and code quality through refactoring, patterns, and best practices. * Collaborate with product and business stakeholders to clarify requirements and trade-offs. * Review code and mentor teammates, gradually taking on technical leadership and ownership. Required Education, Experience, & Skills Required Education, Experience, and Skills * Bachelor's degree in computer science or related field, or equivalent experience. * 4+ years of professional software development experience. * Significant experience delivering full stack web applications (backend + frontend) in production * Experience building and consuming APIs and integrating with external systems/services. * Proficiency with at least one modern frontend framework (e.g., a component-based SPA or similar) and strong skills in HTML, CSS, and JavaScript/TypeScript. * Solid experience with relational databases: schema design, SQL queries, indexing, and performance considerations. * Comfortable working with version control (Git) and modern collaboration workflows (branching, pull requests, code reviews). * Experience writing and maintaining unit and integration tests and using them as part of regular development. * Understanding software design principles and patterns (e.g., SOLID, layering, separation of concerns) Preferred Education, Experience, & Skills * Prior experience as a tech lead or lead engineer on a significant application or subsystem. * Professional experience with C#, ASP.NET Core, and Blazor in production environments. * Experience with MudBlazor or similar component libraries. * Experience with SQL Server and micro-ORMs or lightweight data access libraries (e.g., Dapper). * Familiarity with FluentValidation or similar validation frameworks. * Experience with enterprise authentication (e.g., Windows/Negotiate, Active Directory). * Hands-on experience with CI/CD, monitoring, and performance tuning for web applications. * Experience modernizing or refactoring existing codebases and managing technical debt. * Background building internal enterprise or business process automation solutions and working closely with business stakeholders. Pay Information
Full-Time Salary Range: $97008 - $164914 Please note: This range is based on our market pay structures. However, individual salaries are determined by a variety of factors including, but not limited to: business considerations, local market conditions, and internal equity, as well as candidate qualifications, such as skills, education, and experience. Employee Benefits: At BAE Systems, we support our employees in all aspects of their life, including their health and financial well-being. Regular employees scheduled to work 20+ hours per week are offered: health, dental, and vision insurance; health savings accounts; a 401(k) savings plan; disability coverage; and life and accident insurance. We also have an employee assistance program, a legal plan, and other perks including discounts on things like home, auto, and pet insurance. Our leave programs include paid time off, paid holidays, as well as other types of leave, including paid parental, military, bereavement, and any applicable federal and state sick leave. Employees may participate in the company recognition program to receive monetary or non-monetary recognition awards. Other incentives may be available based on position level and/or job specifics. About BAE Systems Electronic Systems BAE Systems, Inc. is the U.S. subsidiary of BAE Systems plc, an international defense, aerospace and security company which delivers a full range of products and services for air, land and naval forces, as well as advanced electronics, security, information technology solutions and customer support services. Improving the future and protecting lives is an ambitious mission, but it's what we do at BAE Systems. Working here means using your passion and ingenuity where it counts - defending national security with breakthrough technology, superior products, and intelligence solutions. As you develop the latest technology and defend national security, you will continually hone your skills on a team-making a big impact on a global scale. At BAE Systems, you'll find a rewarding career that truly makes a difference. Electronic Systems (ES) is the global innovator behind BAE Systems' game-changing defense and commercial electronics. Exploiting every electron, we push the limits of what is possible, giving our customers the edge and our employees opportunities to change the world. Our products and capabilities can be found everywhere - from the depths of the ocean to the far reaches of space. At our core are more than 14,000 highly talented Electronic Systems employees with the brightest minds in the industry, we make an impact - for our customers and the communities we serve. This position will be posted for at least 5 calendar days. The posting will remain active until the position is filled, or a qualified pool of candidates is identified.