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61 principal software engineer jobs at 12 companies in New Hampshire

2mo
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Principal Software Engineer
Merrimack, New Hampshire, United States
$118k-$201k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Provides advanced defense, aerospace, and security technology solutions.
10+ YOEActive Secret clearance, Bachelor's in CS/CE + 10+ years (or equivalent) experience, embedded C/C++ development on Linux, Python scripting, Agile/DevSecOps and CI/CD, software testing/verification, and strong communication and team leadership skills.
C++, C, Python, Linux, Jira, Confluence, Bitbucket, Git, CI/CD
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3mo
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Principal Software Engineer
Westlake or Merrimack
HybridFull Time
Fidelity Investments
Fidelity Investments: Provides investment management, retirement planning, and brokerage services.
4+ YOEBachelor’s degree preferred; 4+ years software engineering; strong Python/Java, AWS, CI/CD, Spring Boot, SQL; experience with automation, AI-assisted code, and mentoring.
Python, Java, Spring Boot, AWS, EKS, Docker, REST, Maven, JSON, Tomcat, Swagger, Message Queues, Concourse, Git, Jenkins, Artifactory, Veracode, uDeploy, Selenium, Cucumber, FitNesse, Oracle, SQL
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2mo
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Principal Engineer
Alabama or Arizona or Arkansas or California or Colorado or Connecticut or Florida or Georgia or Hawaii or Idaho or Illinois or Indiana or Iowa or Kansas or Kentucky or Maryland or Massachusetts or Michigan or Minnesota or Missouri or Nevada or New Hampshire or New Jersey or New Mexico or New York or North Carolina or Ohio or Oklahoma or Oregon or Pennsylvania or Rhode Island or South Carolina or Tennessee or Texas or Vermont or Virginia or Washington or Wisconsin
$210k-$262k/yr RemoteFull Time
Fuze Health
Fuze Health: Integrated digital health, home diagnostics, and virtual pharmacy platform.
10+ YOEBachelor's in CS or related; 10+ years software engineering experience with 3+ years at staff/principal level; deep expertise in AWS, PostgreSQL, Ruby on Rails, Python, TypeScript/JavaScript; experience building scalable, high-throughput systems; strong communication; U.S. work authorization required.
AWS, PostgreSQL, Ruby on Rails, Python, TypeScript, JavaScript, Slack, GSuite, Jira, HL7, FHIR, NCPDP, EHR
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1mo
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Principal Software Engineer
Westlake or Merrimack
OnsiteFull Time
Fidelity Investments
Fidelity Investments: Provides investment management, retirement planning, and brokerage services.
8+ YOEBachelor's degree and 8+ years of software engineering experience. Requires Python or Java, cloud and containerization experience, CI/CD, automation frameworks, SQL, and strong analytical communication skills.
Python, Java, Spring Boot, AWS, EKS, Docker, Spring, REST, Web Services, Maven, JSON, Apache Tomcat, Swagger, Message Queues, Selenium, Cucumber, FitNesse, SQL, Oracle, Concourse, GIT, Jenkins, Artifactory, Veracode, uDeploy
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Principal Software Engineer – Algorithm Team
Merrimack, New Hampshire, United States
$118k-$201k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Designs and manufactures advanced defense and aerospace systems.
6+ YOEBachelor's in CS/CE +6 yrs (or Master's +4 yrs); current/obtainable Secret clearance; expertise in ML/algorithm development, embedded or application software, C++/Python/Java; strong communication and software engineering practices.
C++, Python, Java, CUDA, Open CL
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Principal Software Engineer
Rhode Island or Mississippi or Montana or North Carolina or Louisiana or Maryland or Maine or Minnesota or Nebraska or Missouri or North Dakota or New York or New Jersey or New Mexico or Nevada or Ohio or South Carolina or Texas or South Dakota or Vermont or Tennessee or Virginia or Washington or Utah or Wisconsin or West Virginia or Oregon or Wyoming or Oklahoma or Pennsylvania or Colorado or Alabama or Arizona or California or Connecticut or District of Columbia or Florida or Iowa or Arkansas or Idaho or Illinois or Kansas or Delaware or Georgia or Indiana or Kentucky or Michigan or Massachusetts or New Hampshire
$144k-$288k/yr RemoteFull Time
CVS Health
CVS HealthNYSE: CVS: Provides retail pharmacy, health insurance, and pharmacy benefit management services.
10+ YOE10+ years IT experience, 7+ years Java/Swift/SwiftUI/Kotlin, 5+ years mobile architecture experience, CI/CD and testing experience, 1+ year AI/ML experience, Flutter and EM/ML framework familiarity.
Java, Swift, SwiftUI, Kotlin, MVVM, Clean Architecture, Flutter, TensorFlow, PyTorch, Scikit-learn, JavaScript, AngularJS, Angular, NodeJS, LangSmith, Braintrust, Promptfoo, Claude Code, Codex, Cursor, GitHub Copilot, Oracle
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2w
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Principal Software Engineer (Sign-on bonus available)
Nashua, New Hampshire, United States
OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA.: Produces advanced defense, aerospace, and information security systems.
6+ YOEBachelor's in CS/CE,6+ years' software engineering experience,proficient in C++,experience with testing/verification,ability to obtain/hold Secret clearance.
C++, GIT, Jira, Bitbucket, Visual Studio, Confluence, ClearCase, Linux
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1w
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Sr. Principal Software Engineer
Pelham, New Hampshire, United States
$132k-$252k/yr OnsiteFull Time
RTX
RTXNYSE: RTX: Provides advanced aerospace and defense systems and services.
10+ YOEBachelor's degree in a STEM field and 10 years of relevant experience; C or C++, Linux or real-time operating systems, multithreaded applications, UI/UX, and active Secret clearance required.
C, C++, Linux, VxWorks, Agile, Scrum, DevSecOps, VxWorks Workbench, Tornado, ClearCase, Git, Microsoft Windows, DOORS, MATLAB, UDP/IP, TCP/IP
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1w
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Principal Engineer
California or Maryland or Texas or United States or Alabama or Arizona or Arkansas or Colorado or Connecticut or Florida or Georgia or Hawaii or Idaho or Illinois or Indiana or Iowa or Kansas or Kentucky or Massachusetts or Michigan or Minnesota or Missouri or Nevada or New Hampshire or New Jersey or New Mexico or New York or North Carolina or Ohio or Oklahoma or Oregon or Pennsylvania or Rhode Island or South Carolina or Tennessee or Vermont or Virginia or Washington or Wisconsin
$210k-$262k/yr RemoteFull Time
Fuze Health
Fuze Health: Technology-powered provider of digital pharmacy and home health services.
10+ YOEBachelor's degree and 10+ years of software engineering experience, including 3+ years at Staff or Principal level. Requires distributed systems expertise and AWS, PostgreSQL, Ruby on Rails, Python, TypeScript, and JavaScript.
AWS, PostgreSQL, Ruby on Rails, Python, TypeScript, JavaScript, Slack, Google Workspace, Jira, HIPAA, SOC 2, HL7, FHIR, NCPDP, EHR
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3w
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Principal Embedded Software Engineer – APKWS
Hudson, New Hampshire, United States
HybridFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Designs and manufactures advanced defense and aerospace systems.
6+ YOEBachelor's in CS/CE or related and 6+ years experience, strong C/C++ skills, RTOS and embedded development, hardware-software co-design, low-power SBC experience, ability to obtain Secret clearance.
C, C++, RTOS
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2mo
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Principal Embedded Software Engineer
Ashburn or Boston or Nashua or Tewksbury
$125k-$175k/yr OnsiteFull Time
Curtiss-Wright
Curtiss-WrightNYSE: CW: Engineers and manufactures critical components for aerospace and defense.
10+ YOEU.S. citizenship and active DoD clearance required. Bachelor's in EE or CE with 10+ years' experience. Hands-on C/C++, Linux/VxWorks, device drivers, bootloaders, scripting, Python, LabVIEW, and embedded development tools. Strong troubleshooting and documentation skills.
C, C++, Linux, Red Hat, LynxOS, Wind River, VxWorks, bash, csh, Python, LabVIEW, IPMI, Visual Studio, Eclipse, Vivado, Vitis, PetaLinux, GCC, CMake, Yocto, U-Boot, BIOS, SlimBootLoader, Microsoft Office
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1mo
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Principal Tetragon Software Engineer
San Jose or North Dakota or Montana or Maine or Ohio or Nebraska or Louisiana or Texas or Nevada or Hawaii or Georgia or Mississippi or Connecticut or Colorado or Wyoming or Wisconsin or West Virginia or Maryland or California or Vermont or New York or New Jersey or Arkansas or South Dakota or Pennsylvania or Michigan or Indiana or Idaho or Arizona or New Mexico or New Hampshire or Kentucky or Alabama or South Carolina or Illinois or Missouri or Massachusetts or Iowa or Tennessee or North Carolina or Minnesota or Kansas or Alaska or Rhode Island or Delaware or Washington or Virginia or Utah or Oregon or Florida or Oklahoma
$231k-$332k/yr RemoteFull Time
Cisco
CiscoNASDAQ: CSCO: Develops and sells networking hardware and cybersecurity software.
10+ YOE10+ years systems programming experience; strong Go and eBPF knowledge; Linux, distributed systems, and kernel-level experience; architecture and performance optimization skills.
Go, eBPF, C, C++, Java, Python, Rust, Kubernetes, Cilium, Tetragon, Splunk, Linux
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2mo
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Principal / Senior Software Engineer (C++, Linux)
Salem, New Hampshire, United States
OnsiteFull Time, Contract
Analogic
Analogic: Provides imaging and detection technology for healthcare and aviation.
Strong C++ and Linux experience, Python scripting familiarity, microservices (REST APIs, MQTT), production distributed systems support, debugging, releases, and technical documentation skills.
C++, Python, Linux, REST APIs, MQTT
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4w
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Principal Engineer – Autonomous Systems
Gulfport or Durham or Baton Rouge or Columbia
OnsiteFull Time
Integer Technologies
Integer Technologies: Applied research and product development for national security.
6+ YOEU.S. citizen able to obtain DoD Secret clearance; advanced degree with substantial experience (BS+10/MS+8/PhD+6); expertise in maritime or adjacent autonomy, modern software engineering, and production research coding.
Git, CI/CD, Python, C++, Rust, PyTorch, TensorFlow, Gazebo, Isaac Sim, MOOS-IvP
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1mo
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Principal AI Engineer
St. Petersburg or Alabama or Arizona or Florida or Georgia or Hawaii or Idaho or Louisiana or Maine or Maryland or Missouri or Montana or New Hampshire or New Jersey or New Mexico or New York or North Carolina or Oklahoma or Oregon or Texas or Utah or Virginia or West Virginia or Wisconsin
$180k-$200k/yr HybridFull Time
The HOTH
The HOTH: Provider of managed SEO and white-label digital marketing services.
10+ YOE10+ years building production software and production AI applications; strong Python and AWS experience; ability to work across frontend, backend, cloud, and AI systems; debugging and architecture skills.
React, Next.js, TypeScript, Tailwind CSS, Python, Django, FastAPI, PostgreSQL, Redis, OpenAI, Anthropic, Gemini, RAG, vector databases, embeddings, AWS, ECS/Fargate, S3, Lambda, Terraform, Docker, Cloudflare, CI/CD
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Principal Systems Engineer-Future Opportunity
Merrimack, New Hampshire, United States
OnsiteFull Time
HiArc
HiArcNASDAQ: ESLT: Designs and manufactures advanced diagnostic and life science systems.
9+ YOEBachelor's in engineering, 9+ years electro-mechanical systems experience, hardware/software integration, onsite daily presence, experience with multidisciplinary requirements and FDA/ISO processes.
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3mo
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Principal Engineering Project Lead
Hudson or Andover
OnsiteFull Time
Mercury Systems
Mercury SystemsNASDAQ: MRCY: Provides secure processing solutions for aerospace and defense missions.
6+ YOEBS degree; 6+ years in project management for hardware/software products; DoD Secret Clearance or ability to obtain; PM tools proficiency; lifecycle knowledge.
Microsoft Project, Jira, Confluence
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