Top Senior Software Engineer Jobs in Philadelphia, PA

Classic automation test engineer responsible for building and configuring automated test infrastructure within sprints. Requires coding (Java or Python), strong familiarity with Gherkin/Cucumber, front-end or back-end automation, performance/load testing, and tools like Selenium, Appium, TestNG/JUnit and Spring. Role is roughly 60% coding and 40% test automation setup. 12+ month contract; good communication skills required.

Build and scale a mission-driven SaaS platform for critical care: design and develop secure APIs, collaborate with cross-functional teams, contribute to DevOps pipelines, shape application architecture and performance, and ship production-quality code.

Design and develop custom software solutions across multiple systems and collaborate with teams to ensure success in complex projects.

Lead design, development, and maintenance of native Android applications using Kotlin and modern frameworks. Define architecture, implement features, integrate APIs, ensure accessibility, security, and performance, run CI/CD and automated tests, conduct code reviews, mentor developers, and collaborate with product, design, and backend teams to deliver production apps to Google Play.

Drive full‑stack development of a SaaS EHR platform using Angular and .NET Core. Design and implement scalable APIs and services, influence architecture, own features from design through release, collaborate with engineering, and mentor junior developers to improve performance, reliability, and maintainability.

The Principal Engineer leads software development for optical networking products, mentors junior engineers, and supports pre and post-sales interactions. Requires expertise in embedded systems, C/C++, and networking protocols.

The Senior Backend Engineer at Perpay will design RESTful APIs, improve backend system reliability, and lead technical projects while mentoring team members. Collaboration with product stakeholders is essential for effective backend solutions.

The Staff Software Engineer will develop and support product features, enforce coding best practices, mentor junior engineers, and contribute to architectural decisions in a fintech environment.

Build features on the City's headless CMS (Directus) and PhilaUI Vue.js frontend, migrate from WordPress, design APIs, write unit tests, review code, mentor engineers, collaborate with stakeholders, and support AWS-hosted infrastructure and city web platforms.

The Senior Software Engineer will design, develop, and implement software solutions for law enforcement, leading projects and mentoring junior engineers in a collaborative Agile Scrum environment.

The Software Engineer will develop Link's investment analytics platform, design application infrastructure, and work directly with business teams on solutions and feedback.

Hands-on technical lead responsible for designing, coding, and maintaining APIs, integrations, automations, and services across backend, frontend, data, and DevOps. Own end-to-end delivery, set technical standards, mentor offshore/nearshore developers, manage vendor integrations, and establish engineering processes, CI/CD, and SRE practices.

The Sr. Software Engineer will develop and test applications using .NET and SQL, collaborate with teams, ensure quality practices, and maintain technical documentation. They will contribute to software design and process improvements while adapting to changing environments in payment systems.

As a Staff Software Engineer, you will design, build, and scale backend systems for a financial platform while providing technical leadership and collaborating cross-functionally.

Lead the design and architecture of software systems, mentor developers, and develop scalable applications using C#, React, and Azure. Emphasizes CI/CD and AI tools.

Lead the implementation of scalable features, develop technical requirements, collaborate across teams, and enhance product offerings at Perpay.

The Senior Software Engineer will focus on frontend technology, implement features, mentor engineers, and ensure quality user experiences, primarily using React.

Collaborate with hardware and software engineering to develop and maintain traffic sensor systems, improve operations, and enhance security and performance.

The Senior Software Developer will create and maintain server-side software, collaborate in Agile projects, and ensure system operational support.

Design, develop, and maintain secure, scalable full-stack web applications across backend, APIs, and frontend. Collaborate with product and design, perform code reviews, mentor engineers, troubleshoot complex issues, and drive continuous improvement and AI-enabled solutions throughout the SDLC.

Design, build, and scale backend services and APIs; own AWS infrastructure and CI/CD; optimize codebase and databases; ensure security, reliability, and observability; collaborate cross-functionally and evaluate AI tooling.

Design and implement automated tests, frameworks, and fixtures for embedded hardware and software. Execute regression, performance, stress, and reliability tests. Build and maintain R&D and production test environments, collaborate to debug firmware and hardware, define testability in design reviews, support manufacturing partners, and enable customers onsite (10-20% travel).