Jobs and Careers
AG
Sr. Software Engineer
Agile DefenseUKRemotefull_timeVerifiedPosted 17 Dec 2025
💰 $135,000/yr($110,000/yr – $135,000/yr)
About the role
At Agile Defense we know that action defines the outcome and new challenges require new solutions. That’s why we always look to the future and embrace change with an unmovable spirit and the courage to build for what comes next.
Our vision is to bring adaptive innovation to support our nation's most important missions through the seamless integration of advanced technologies, elite minds, and unparalleled agility—leveraging a foundation of speed, flexibility, and ingenuity to strengthen and protect our nation’s vital interests.
Requisition #: 1340Job Title: Sr. Software EngineerLocation: RemoteSalary: $110,000 - $135,000/year
SUMMARY
Agile Defense is seeking a skilled and driven Sr. Software Engineer to join our dynamic team. As a Sr. Software Engineer, you will contribute to the development and optimization of software systems that drive mission-critical outcomes for our clients. This role demands a technical expert eager to innovate, solve complex problems, and deliver high-quality software solutions in a collaborative and supportive environment.At Agile Defense, we are passionate about empowering our employees, fostering career progression, and maintaining a vibrant company culture that values innovation, teamwork, and diversity. Join a company that is committed to making a real impact through cutting-edge technology and industry-leading practices.
JOB DUTIES AND RESPONSIBILITIES
· Own end-to-end architecture for complex systems, including service boundaries, data models, API design, integration patterns, and non-functional requirements (scalability, performance, security, reliability).· Lead design and implementation of mission-critical applications and platforms in Java/Spring Boot, with React-based frontends that consume RESTful APIs.· Define technical standards and best practices for coding, testing, documentation, and observability; ensure adoption across teams.· Drive system integration strategies (REST, events, messaging), interoperability, and data consistency across services and platforms.· Champion secure-by-design principles: authentication/authorization (Spring Security, OAuth2/JWT), secrets management, secure data handling, least privilege, and compliance with industry standards.· Optimize performance across the stack: JVM tuning, SQL query optimization, caching strategies (e.g., Redis), API throughput, frontend rendering and bundle performance.· Establish robust reliability practices: SLAs/SLOs, error budgets, circuit breakers, retries, idempotency, graceful degradation, and disaster recovery plans.· Partner with product, UX, security, SRE/DevOps, and data teams to align architecture with business goals; translate complex technical concepts for non-technical stakeholders.· Lead technical planning, RFCs/ADRs, design reviews, and phased delivery plans; decompose large initiatives into measurable milestones.· Mentor and develop engineers (L2–L3); elevate code quality through constructive reviews, pairing, and guidance on design patterns and trade-offs.· Evaluate and introduce new frameworks, libraries, and cloud services; govern proof-of-concepts and production rollouts.· Oversee CI/CD, infrastructure-as-code, and automated testing strategies to enable frequent, safe releases.· Maintain high-quality documentation: architectural diagrams, API specifications (OpenAPI), runbooks, and operational playbooks.
QUALIFICATIONS
Education, Background, and Years of Experience· Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience).· 8–12+ years of professional software engineering experience, including leading large-scale, multi-team initiatives.
ADDITIONAL SKILLS & QUALIFICATIONS Required Skills
· Deep expertise in Java and Spring Boot for building production-grade, secure RESTful services.· Strong proficiency with React for building performant, accessible, and maintainable front-end applications.· Demonstrated success in systems architecture, integration, and scaling high-availability services.· Hands-on experience with relational and NoSQL databases, data modeling, indexing, transactions, and performance tuning.· Solid understanding of software security fundamentals (OWASP Top 10, threat modeling) and practical implementation using Spring Security, OAuth2/JWT.· Experience with cloud platforms (AWS/Azure/GCP), containers (Docker), and orchestration (Kubernetes).· Proven track record with CI/CD pipelines, automated testing (unit, integration, contract, end-to-end), and infrastructure-as-code.· Excellent communication and leadership skills; able to influence strategy and drive consensus across diverse teams.
Preferred Skills
· Microservices and event-driven architecture (Kafka/RabbitMQ) and API-first design (OpenAPI/Swagger).· Domain-driven design, clean/hexagonal architecture, and advanced design patterns.· Observability and operations: metrics, logs, traces (Prometheus/Grafa
Our vision is to bring adaptive innovation to support our nation's most important missions through the seamless integration of advanced technologies, elite minds, and unparalleled agility—leveraging a foundation of speed, flexibility, and ingenuity to strengthen and protect our nation’s vital interests.
Requisition #: 1340Job Title: Sr. Software EngineerLocation: RemoteSalary: $110,000 - $135,000/year
SUMMARY
Agile Defense is seeking a skilled and driven Sr. Software Engineer to join our dynamic team. As a Sr. Software Engineer, you will contribute to the development and optimization of software systems that drive mission-critical outcomes for our clients. This role demands a technical expert eager to innovate, solve complex problems, and deliver high-quality software solutions in a collaborative and supportive environment.At Agile Defense, we are passionate about empowering our employees, fostering career progression, and maintaining a vibrant company culture that values innovation, teamwork, and diversity. Join a company that is committed to making a real impact through cutting-edge technology and industry-leading practices.
JOB DUTIES AND RESPONSIBILITIES
· Own end-to-end architecture for complex systems, including service boundaries, data models, API design, integration patterns, and non-functional requirements (scalability, performance, security, reliability).· Lead design and implementation of mission-critical applications and platforms in Java/Spring Boot, with React-based frontends that consume RESTful APIs.· Define technical standards and best practices for coding, testing, documentation, and observability; ensure adoption across teams.· Drive system integration strategies (REST, events, messaging), interoperability, and data consistency across services and platforms.· Champion secure-by-design principles: authentication/authorization (Spring Security, OAuth2/JWT), secrets management, secure data handling, least privilege, and compliance with industry standards.· Optimize performance across the stack: JVM tuning, SQL query optimization, caching strategies (e.g., Redis), API throughput, frontend rendering and bundle performance.· Establish robust reliability practices: SLAs/SLOs, error budgets, circuit breakers, retries, idempotency, graceful degradation, and disaster recovery plans.· Partner with product, UX, security, SRE/DevOps, and data teams to align architecture with business goals; translate complex technical concepts for non-technical stakeholders.· Lead technical planning, RFCs/ADRs, design reviews, and phased delivery plans; decompose large initiatives into measurable milestones.· Mentor and develop engineers (L2–L3); elevate code quality through constructive reviews, pairing, and guidance on design patterns and trade-offs.· Evaluate and introduce new frameworks, libraries, and cloud services; govern proof-of-concepts and production rollouts.· Oversee CI/CD, infrastructure-as-code, and automated testing strategies to enable frequent, safe releases.· Maintain high-quality documentation: architectural diagrams, API specifications (OpenAPI), runbooks, and operational playbooks.
QUALIFICATIONS
Education, Background, and Years of Experience· Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent experience).· 8–12+ years of professional software engineering experience, including leading large-scale, multi-team initiatives.
ADDITIONAL SKILLS & QUALIFICATIONS Required Skills
· Deep expertise in Java and Spring Boot for building production-grade, secure RESTful services.· Strong proficiency with React for building performant, accessible, and maintainable front-end applications.· Demonstrated success in systems architecture, integration, and scaling high-availability services.· Hands-on experience with relational and NoSQL databases, data modeling, indexing, transactions, and performance tuning.· Solid understanding of software security fundamentals (OWASP Top 10, threat modeling) and practical implementation using Spring Security, OAuth2/JWT.· Experience with cloud platforms (AWS/Azure/GCP), containers (Docker), and orchestration (Kubernetes).· Proven track record with CI/CD pipelines, automated testing (unit, integration, contract, end-to-end), and infrastructure-as-code.· Excellent communication and leadership skills; able to influence strategy and drive consensus across diverse teams.
Preferred Skills
· Microservices and event-driven architecture (Kafka/RabbitMQ) and API-first design (OpenAPI/Swagger).· Domain-driven design, clean/hexagonal architecture, and advanced design patterns.· Observability and operations: metrics, logs, traces (Prometheus/Grafa
Apply for this role
Generate a tailored application kit with a matched cover letter, interview prep, and CV highlights — in under 60 seconds.
Apply Now →Generate Application KitFree account required — sign up in 30s