Senior Software Engineer (.Net)

Senior Software Engineer - .NET & Enterprise Systems About the Role We are seeking a Senior Software Engineer to join an enterprise technology team focused on building, maintaining, and modernizing critical business applications. This is an opportunity for an engineer who enjoys working within complex, established environments and understands that great software engineering is about more than writing code. You’ll be responsible for understanding how systems support the business, translating real-world requirements into thoughtful technical solutions, and improving existing applications without disrupting the operations that depend on them. The current environment is heavily centered around C#, .NET, and SQL Server, while the team is actively modernizing its technology foundation. You’ll have the opportunity to contribute to initiatives involving Linux, Docker, containerization, cloud-native technologies, and more portable data solutions. The ideal candidate is comfortable operating across the full software development lifecycle and can move between technical implementation, architecture, requirements gathering, and collaboration with business stakeholders. What You'll Do Design, develop, maintain, and modernize enterprise applications using C# and .NET, including .NET Framework and modern .NET Take ownership of significant portions of the software development lifecycle, including requirements gathering, technical design, development, testing, deployment, and ongoing support Work with SQL Server data layers, including schema design, complex queries, stored procedures, and performance optimization Contribute to the modernization and migration of applications toward Linux-based container environments Containerize .NET applications using Docker and contribute to orchestration strategies using Kubernetes or comparable technologies Collaborate directly with business stakeholders to understand workflows, clarify requirements, and translate business needs into technical solutions Challenge requirements and approaches when necessary to identify potential risks, gaps, or opportunities for improvement before development begins Build and consume REST APIs and integrate applications with internal and third-party systems Apply strong software design principles, coding standards, architectural patterns, and development practices Identify technical debt and help develop practical, prioritized plans for addressing it Troubleshoot and support applications in production environments Mentor less experienced developers and contribute to the overall growth of the engineering team Document technical decisions, system behavior, and implementation details to support long-term maintainability What We're Looking For Technical Experience Strong professional experience with C# and the .NET ecosystem Experience working across both .NET Framework and modern .NET Strong understanding of object-oriented design, SOLID principles, and common enterprise design patterns Strong SQL Server experience, including database design, complex queries, stored procedures, and performance tuning Experience with Docker and application containerization Familiarity with Kubernetes or similar container orchestration platforms Comfortable working in Linux environments, including troubleshooting and application operation Experience with Git, CI/CD pipelines, and production deployments Experience building and consuming RESTful APIs Understanding of distributed systems and application integration patterns Business & SDLC Experience Experience gathering, clarifying, and documenting business requirements Ability to understand complex business workflows and accurately translate them into software Experience owning or co-owning the end-to-end SDLC, beyond simply writing code Strong ability to evaluate requirements and identify when a request needs to be reconsidered or reframed Strong written communication skills, particularly around technical documentation and design decisions Ability to work effectively with both technical and non-technical stakeholders Working Style Highly autonomous and capable of managing priorities, commitments, and quality without close supervision A systems thinker who considers downstream impacts before making changes to shared systems Comfortable working within complex, established applications and environments Honest and transparent about technical risk, scope, and delivery timelines Comfortable navigating ambiguity and bringing structure to unclear requirements Collaborative and willing to mentor and support other engineers Takes ownership of problems from discovery through resolution Nice to Have Experience migrating .NET applications from Windows environments to Linux-based containers Experience with alternative relational databases such as PostgreSQL or MySQL Exposure to cloud-native application architecture and open-source technologies Experience with workflow or BPM platforms Experience designing workflow or state-machine logic Experience working in regulated or compliance-driven environments Familiarity with message queues, event-driven architecture, or asynchronous integration patterns Experience working across Microsoft and non-Microsoft technology ecosystems Determining compensation for this role (and others) at Vaco/Highspring depends upon a wide array of factors including but not limited to the individual’s skill sets, experience and training, licensure and certifications, office location and other geographic considerations, as well as other business and organizational needs. With that said, as required by local law in geographies that require salary range disclosure, Vaco/Highspring notes the salary range for the role is noted in this job posting. The individual may also be eligible for discretionary bonuses, and can participate in medical, dental, and vision benefits as well as the company’s 401(k) retirement plan. Additional disclaimer: Unless otherwise noted in the job description, the position Vaco/Highspring is filing for is occupied. Please note, however, that Vaco/Highspring is regularly asked to provide talent to other organizations. By submitting to this position, you are agreeing to be included in our talent pool for future hiring for similarly qualified positions. Submissions to this position are subject to the use of AI to perform preliminary candidate screenings, focused on ensuring minimum job requirements noted in the position are satisfied. Further assessment of candidates beyond this initial phase within Vaco/Highspring will be otherwise assessed by recruiters and hiring managers. Vaco/Highspring does not have knowledge of the tools used by its clients in making final hiring decisions and cannot opine on their use of AI products. EEO Notice Vaco by Highspring is an Equal Opportunity Employer and does not discriminate against any employee or applicant for employment because of race (including but not limited to traits historically associated with race such as hair texture and hair style), color, sex (includes pregnancy or related conditions), religion or creed, national origin, citizenship, age, disability, status as a veteran, union membership, ethnicity, gender, gender identity, gender expression, sexual orientation, marital status, political affiliation, or any other protected characteristics as required by federal, state or local law. Vaco by Highspring and its parents, affiliates, and subsidiaries are committed to the full inclusion of all qualified individuals. As part of this commitment, Vaco by Highspring and its parents, affiliates, and subsidiaries will ensure that persons with disabilities are provided reasonable accommodations. If reasonable accommodation is needed to participate in the job application or interview process, to perform essential job functions, and/or to receive other benefits and privileges of employment, please contact . Vaco by Highspring also wants all applicants to know their rights that workplace discrimination is illegal. Representation Notice By submitting to this position, you agree that you will be giving Vaco by Highspring the exclusive right to present your as a candidate for the foregoing employment opportunity. You further agree that you have represented information about yourself accurately and have not affirmatively misrepresented your qualifications. You also agree to maintain as confidential, to the fullest extent permitted by law, any information you learn from Vaco by Highspring about the position and you will limit disclosure of information about the position only to the extent necessary to perform any obligations in furtherance of your application. In exchange, Vaco by Highspring agrees to exercise reasonable efforts to represent you through all solicitation, job screening and resume dispersal. For residents of Ontario, Canada: Based on Highspring’s discussions with its Client, Highspring’s understanding is that this position for employment is a current vacancy (either through Highspring as a contractor or with the client directly). Privacy Notice Vaco by Highspring and its parents, affiliates, and subsidiaries (“we,” “our,” or “Vaco by Highspring”) respects your privacy and are committed to providing transparent notice of our policies. California residents may access Vaco by Highspring HR Notice at Collection for California Applicants and Employees here. Virginia residents may access our state specific policies here. Residents of all other states may access our policies here. Canadian residents may access our policies in English here and in French here. Residents of countries governed by GDPR may access our policies here. Additionally, submissions to this position are subject to the use of AI to perform preliminary candidate screenings, focused on ensuring minimum job requirements noted in the position are satisfied. More details about Vaco by Highspring’s use of AI can be found here ( Further assessment of candidates beyond this initial phase will be conducted by recruiters and hiring managers. Vaco by Highspring does not know and cannot opine on if its client’s use of AI products in hiring. Pay Transparency Notice Determining compensation for this role (and others) at Vaco by Highspring depends upon a wide array of factors including but not limited to: the individual’s skill sets, experience and training; licensure and certification requirements; office location and other geographic considerations; other business and organizational needs. With that said, as required by local law, Vaco by Highspring believes that the following salary range referenced above reasonably estimates the base compensation for an individual hired into this position in geographies that require salary range disclosure. The individual may also be eligible for discretionary bonuses.