Top Senior Software Engineer Jobs in Jacksonville, FL

As a Senior Software Engineer at SmithRx, you will design, develop, and maintain back-end architecture for our product suite using various programming languages, collaborate with stakeholders, ensure high-quality software, and mentor junior team members.

Own and modernize iHerb's product catalog across backend, React frontend, and relational data. Build end-to-end features, use AI-driven SDLC tools, write automated tests, ensure observability, participate in on-call incident response, and contribute to shared engineering standards.

The Senior Software Engineer II will design and build backend features, evolve AI-native workflows, and enhance the payment infrastructure while collaborating closely with product teams to deliver high-quality solutions.

The Staff/Principal Software Engineer will work in a remote global team, addressing software engineering challenges while fostering collaboration and clear communication.

The Senior Software Quality Engineer will architect the automated QA framework for WISEcode's platform, focusing on quality engineering practices, automated testing for ASP.NET and Blazor applications, CI/CD integration, and collaboration with engineering teams to ensure robust quality standards are met.

Design and develop scalable backend systems for SaaS applications, mentor engineers, and lead projects while collaborating with cross-functional teams.

Work on Firefox accessibility by improving the Gecko accessibility engine: write and test C++ code, debug multi-process/multi-threaded and OS-specific issues, collaborate with designers and other browser teams, influence web accessibility standards, and build infrastructure to expose the web platform to assistive technologies.

Lead development and improvement of Firefox's Gecko accessibility engine: write and test C++ code, debug multi-process/multi-threaded and OS-specific issues, collaborate with design and product teams, influence web accessibility standards, build infrastructure exposing the web platform to assistive technologies, and ensure memory and performance targets are met.

Develop and maintain backend services for the Leap quantum-classical cloud platform. Deliver features across the SDLC, improve system performance and scalability, troubleshoot and resolve production issues, participate in code reviews and on-call rotation, mentor junior developers, and collaborate with cross-functional teams to ship reliable, high-quality software.

Design, build, and maintain backend systems and APIs for the Wikidata Query Service. Improve reliability, observability, automation, and scalability; monitor production, respond to incidents, support migrations, and collaborate across SRE, data, and product teams.

Lead low-level bring-up and stabilization of Qualcomm-based Android/Linux device OS for a large fleet of solar-powered cameras. Implement devicetree and pSIM frameworks, customize bootloaders, develop/debug ADSP firmware, collaborate with hardware and application teams, and improve CI/tooling to ensure reliable field deployments.

Design, build, and maintain a quality platform and developer tooling to enable testable, observable, and measurable software. Improve CI/CD gates, telemetry, and feedback systems; integrate testing and production signals; leverage AI/agents to automate quality tasks; partner on design and quality strategy; coach engineers and reduce operational toil to increase release confidence.

Lead full‑stack development of the imaging web platform: architect and build ASP.NET Core services and Vue frontends, design secure APIs integrating EMRs and AI, own testing, CI/CD, and Azure deployments, mentor engineers, and collaborate with product, design, and clinical teams to deliver performant, reliable screening experiences.

Lead design and delivery of full-stack imaging features, architect high-performance ASP.NET Core services, build Vue frontends, integrate APIs with EMRs and imaging partners, mentor engineers, enforce automated testing, CI/CD and observability, and drive technical roadmap in an Agile team.

Design, build, and maintain scalable medical imaging software; evaluate and integrate AI-assisted development tools; collaborate with product and engineering teams; troubleshoot clinical environments; support CI/CD, testing, and deployment; participate in pair programming and knowledge sharing.

Lead design and development of software that interfaces with quantum processors, supporting calibration, hardware interfaces, testing, monitoring, and operational infrastructure. Drive architecture, optimize performance, mentor engineers, run technical investigations, and participate in on-call rotations to ensure QPU solver availability on the Leap cloud platform.

Own and deliver full-stack features across Ruby on Rails backend, React web, and Flutter mobile. Translate user needs into pragmatic solutions, drive architecture and production deployments, mentor teammates, address technical debt, and ensure reliability, performance, and security for mission-critical healthcare systems.

As a Senior Software Engineer, you'll lead efforts to improve configuration management and tackle challenges in identity and access management while promoting a culture of clean code and effective architectural solutions.

Lead end-to-end design, implementation, and operation of cloud partner integrations: auth/identity flows, multi-tenancy, data movement, CI/deployment, and observability. Own production systems and on-call duties, collaborate with partner platforms and internal teams, write design docs, and set technical defaults for a growing team.

Design, build, and maintain Python-based systems that interface with custom hardware. Own hardware drivers across serial/USB/I2C/SPI/Modbus, implement maintainable state machines, write async event-driven code, build RESTful APIs, persist device telemetry in SQL, contribute computer vision work, and collaborate with hardware, firmware, and operations while mentoring engineers and raising engineering standards.

The Senior Software Engineer, Payments will design and implement backend infrastructure for a blockchain-integrated banking platform, focusing on payment processing and operations.

Join Dakota's core engineering team to design and implement back-end infrastructure for a blockchain-integrated banking platform, addressing high-visibility projects.

As a Principal Software Engineer at Fetch, you'll design scalable systems for user engagement, drive experimentation, lead technical strategy, and mentor teams to improve engineering productivity and system reliability.

Design, build, and maintain automation and testing infrastructure for the North platform: CI/CD pipelines, GitHub workflows, containerized test environments (Docker/Kubernetes), Helm and ArgoCD deployments, infrastructure-as-code, benchmarking, parallel test execution, and cross-team standards to improve test coverage, reliability, and deployment confidence.

As a Founding Staff Software Engineer, you will lead the design and development of robust backend systems and APIs, optimize large-scale data workflows, and mentor a growing engineering team.