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Senior Software Engineer - Systems Jobs (On-site work)

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Amentum seeks a Senior Software Engineer to support the Space Force Range Contract in Melbourne, FL. You will design, develop, and test complex software for new and existing systems. Requires a STEM Bachelor’s degree, 8+ years of experience, and proficiency in Python, JavaScript, Windows, and Lin...
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United States , Melbourne
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135000.00 - 150000.00 USD / Year
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Amentum
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UI UX Senior Software Engineer
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Senior UI/UX Software Engineer needed to lead full-stack development for U.S. Army and USMC defense systems at Aberdeen Proving Ground. Requires expertise in Java, JavaScript, React, Angular, and Agile methodologies. Must have experience with DoD mission-critical platforms, CI/CD pipelines, and c...
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United States , Aberdeen Proving Ground
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VES
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Senior Software Engineer
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Senior Software Engineer sought for full-stack development in Warrenton, VA or Augusta, GA. Must have strong Java, JavaScript/TypeScript, and an active TS/SCI with polygraph. Collaborate on mission-critical systems using Python, Angular, React, and ElasticSearch. Join a supportive team offering d...
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United States , Warrenton, VA; Augusta, GA
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Altamira Technologies
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Senior Software Engineer
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Senior Software Engineer with Top Secret Clearance needed in Warrenton, VA. You’ll deliver full-stack solutions using Java, JavaScript, and TypeScript, while adapting to Python, Angular, or React. Join a collaborative team that values independent problem-solving and continuous integration. Must h...
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United States , Warrenton
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Altamira Technologies
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Senior Software Engineer
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Senior Software Engineer sought for full-stack development in Dayton, US. Requires TS/SCI clearance, 10+ years’ experience, and expertise in C++, Python, JavaScript, React, or Angular. You’ll drive algorithm innovation, legacy support, and web solutions in a collaborative, problem-solving environ...
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United States , Dayton
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Altamira Technologies
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Senior Principal Software Engineer — Layer 7 Security
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Senior Principal Software Engineer — Layer 7 Security role in Santa Clara, CA. Lead architecture and development of next-gen, high-performance distributed security systems. Requires 12+ years of experience, expert-level C and Go, deep networking and TCP/IP expertise. Drive innovation in mission-c...
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United States , Santa Clara
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147000.00 - 237500.00 USD / Year
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Palo Alto Networks
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Senior Lead Software Engineer
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Senior Lead Software Engineer sought by Capital One to drive major tech transformation in McLean, VA. Lead full stack teams building cloud-based solutions on AWS, Azure, or GCP using Java, Python, or TypeScript. Requires 6+ years software engineering experience and 1+ year cloud computing. Enjoy ...
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United States , McLean
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229900.00 - 262400.00 USD / Year
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Capital One
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Senior Lead Software Engineer (Full Stack)
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Senior Lead Full Stack Software Engineer sought by Capital One to drive cloud-native transformation in Houston, McLean, or Riverwoods. Lead diverse tech projects, mentor engineers, and build robust solutions using JavaScript, Java, Python, or Go. Requires 6+ years’ software engineering experience...
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United States , Houston; McLean; Riverwoods
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209000.00 - 262400.00 USD / Year
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Capital One
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Senior Software Engineer - Full Stack
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Join Microsoft Clarity as a Senior Full Stack Engineer to build a high-performance user behavior analytics platform used by millions. You’ll own data accuracy and efficiency, develop AI-forward features, and design scalable distributed services on Azure. Based in Redmond, this role requires 4+ ye...
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United States , Redmond
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119800.00 - 234700.00 USD / Year
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Microsoft Corporation
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Senior Software Engineer
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Senior Software Engineer sought by a London health-tech scale-up to scale a platform used by 100k+ customers. You’ll own problems end-to-end, working across Python backend, React/TypeScript frontend, and AWS infrastructure. Ideal candidates have 5+ years experience, actively use AI in their workf...
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United Kingdom , London
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100000.00 GBP / Year
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Orbis Consultants
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Senior Software Engineer
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Join a greenfield AI startup in London redefining innovation discovery and protection. As a Senior Software Engineer, you’ll build production systems from scratch using Java, TypeScript, or Python, integrate with LLMs, and collaborate directly with founders. No legacy code or bureaucracy—just fas...
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United Kingdom , London
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120000.00 - 150000.00 GBP / Year
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Linux Recruit
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Senior Software Engineer
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Senior Software Engineer needed in Annapolis Junction to design and optimize scalable data pipelines using Apache Spark, Airflow, and Python/Java. You will architect high-performance data ingress/egress systems for analytics workloads. Requires expertise in distributed processing, Linux CLI, Bash...
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United States , Annapolis Junction
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2HB
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Senior Software Engineer
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Senior Software Engineer needed in Annapolis Junction to design, sustain, and troubleshoot complex operational data flows. You will manage data storage, transport, security, and compliance while performing exploratory analysis to clean and transform raw data. Requires a Master’s degree plus 5 yea...
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United States , Annapolis Junction
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2HB
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Senior Software Engineer - Test Automation/Java
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Senior Software Engineer – Test Automation (Java) role in Warsaw, Poland. Join Mastercard's Developer Experience team to build and maintain high-quality automated tests and frameworks. Requires 5+ years of experience, strong Java skills, and expertise in API, UI, and distributed systems testing. ...
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Poland , Warsaw
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Mastercard
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Senior Software Engineer
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Join Microsoft’s OneDrive-SharePoint team in Noida as a Senior Software Engineer. You’ll solve cloud-scale challenges for 200M+ MAU using C#, .NET, or Python. Lead full-stack development, mentor juniors, and influence M365’s roadmap. Requires 8+ years’ experience, agile skills, and Azure knowledg...
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India , Noida
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Microsoft Corporation
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Senior Full Stack Software Engineer
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Senior Full Stack Software Engineer role at Miracle Heights, India, seeking 8-10 years of experience. You will design and deploy scalable cloud-native applications using Angular, React, Python (Flask/FastAPI), and SQL on GCP. Key responsibilities include building CI/CD pipelines, managing infrast...
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India , Miracle Heights
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Miracle Software Systems
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Senior Software Engineer - Fullstack | Data & Product | Enabling Functions | Inter IKEA
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Senior Software Engineer - Fullstack role at Inter IKEA in Malmö, Sweden. You will design scalable data & digital products, develop RESTful/GraphQL APIs, and build responsive React applications. Requires 5+ years in API design, authentication (OAuth 2.0, JWT), and test-driven development. Join a ...
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Sweden , Malmö
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IKEA
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Senior Embedded Software Engineer
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Senior Embedded Software Engineer sought to architect next-gen motion control systems for robotics and industrial automation. This role demands strong C/C++, ARM, and RTOS/bare metal expertise to optimize real-time algorithms. Based in Gloucestershire, you'll join a global R&D team solving comple...
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United Kingdom , Gloucestershire
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T2M Resourcing
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Senior Software Engineer
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Join Microsoft Advertising as a Senior Software Engineer to reinvent AI-era measurement systems. You’ll build near real-time conversion pipelines, optimizing attribution signals for global campaign performance. Requires a CS degree and 4+ years in C#, Java, or Python. Based in Redmond, WA, this r...
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United States , Redmond
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119800.00 - 234700.00 USD / Year
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Microsoft Corporation
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Senior Principal Software Engineer — Layer 7 Security
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Senior Principal Software Engineer sought to lead Layer 7 security innovation in Santa Clara. This strategic role demands expert-level C/Go skills, deep Unix/Linux experience, and a proven track record designing large-scale distributed systems. You will define architecture for next-gen firewall p...
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United States , Santa Clara
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170000.00 - 277000.00 USD / Year
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Palo Alto Networks
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About the Senior Software Engineer - Systems role

Explore Senior Software Engineer - Systems jobs and discover a pivotal role at the intersection of software development and core infrastructure. Professionals in these positions are the architects and builders of the foundational platforms, services, and frameworks that power large-scale, reliable, and performant applications. Unlike roles focused solely on end-user features, Senior Software Engineers in Systems delve into the underlying engine, optimizing for scalability, resilience, and efficiency to support millions of users and complex data flows.

Typically, individuals in this profession are responsible for designing, developing, and maintaining critical system-level software. This includes creating distributed systems, high-throughput data pipelines, low-latency services, and robust platform infrastructure. Common responsibilities involve architecting scalable solutions, conducting deep-dive performance analysis and debugging across the entire software stack, establishing engineering best practices and standards, and providing technical leadership and mentorship to other engineers. They own the full lifecycle of system components, from conceptual design and implementation to deployment, monitoring, and iterative improvement.

The role demands a unique blend of deep technical expertise and strategic vision. Typical skills and requirements include extensive experience with systems programming languages such as C++, Go, Java, or Rust, and a profound understanding of computer science fundamentals like data structures, algorithms, operating systems, and networking. Expertise in distributed systems concepts—including consensus, consistency, and fault tolerance—is paramount. These engineers are proficient in profiling and debugging complex systems, often needing to trace issues from high-level application logic down to native code or kernel interactions. A performance-first mindset, experience with cloud-native technologies and containerization, and a strong grasp of CI/CD pipelines and observability tools are standard expectations. Leadership skills are crucial, as these senior professionals champion technical excellence, drive architectural decisions, and elevate the entire engineering organization through mentorship and the establishment of a culture focused on robustness and scalability.

For those seeking to solve the most challenging engineering problems and build the bedrock upon which digital experiences stand, exploring Senior Software Engineer - Systems jobs offers a career path defined by high impact, continuous learning, and shaping the technological future of an organization.

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