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Senior Software Engineer - Java/Kotlin Jobs

3426 Job Offers

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Senior Java Software Engineer
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Senior Java Software Engineer sought for a permanent, hybrid role in Athens' northern suburbs. Join a fintech leader to build high-performance backend services using Spring, PostgreSQL, and Bash. You'll optimize systems serving millions, tackle performance bottlenecks, and adopt modern tools like...
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Greece , Athens
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Not provided
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Randstad
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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 (Kotlin)
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Senior Software Engineer (Kotlin) sought by hyperexponential, a high-growth AI startup backed by a16z. Build scalable, cloud-native data systems on AWS using Terraform and Kotlin. You will design distributed analytics infrastructure and deliver customer-facing features for a $7 trillion insurance...
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United Kingdom , London
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Not provided
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hyperexponential
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Senior Software Engineer
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Senior Software Engineer sought to design and scale validation platforms for system-level confidence. This hands-on role requires 5+ years building distributed systems, Python/JavaScript expertise, and AWS experience. You will develop cloud-native services, APIs, and automation tooling for CI-int...
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India
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SimpliSafe
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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, MediaWiki
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Join the Wikimedia Foundation as a Senior Software Engineer on the MediaWiki Platform team. You will enhance the core open-source platform powering Wikipedia, focusing on performance, scalability, and reliability. We seek backend engineering expertise, strong system design skills, and experience ...
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United States
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113082.00 - 175725.00 USD / Year
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Wikimedia Foundation
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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 Development Engineer
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Senior Software Development Engineer sought by CVS Health Digital to drive backend innovation using Java, Spring Boot, and microservices. You will design complex systems, integrate cloud-native services on GCP, and streamline CI/CD pipelines. This hybrid role in Buffalo Grove or Richardson offers...
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United States , Buffalo Grove; Richardson
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92700.00 - 203940.00 USD / Year
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CVS Health
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Senior Software Engineering-CoreAI
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Senior Software Engineering role at Microsoft CoreAI in Redmond, WA. Design and develop foundational platforms for Generative AI, including agent tooling, authentication, and control plane APIs. Requires 4+ years experience in C, C++, C#, Java, JavaScript, or Python, plus expertise in large-scale...
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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 - Margin Technology - Assistant Vice President
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Senior Software Engineer (AVP) sought for Citi’s Margin Technology team in London. You will build high-impact financial systems using Java, React, and Python, with expertise in RESTful APIs, Spring, and TDD. Ideal candidates have investment banking experience and knowledge of AWS, Kafka, or Kuber...
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United Kingdom , London
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Citi
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Senior Software Engineer (React)
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Senior Software Engineer (React) sought to build intuitive, high-performance UIs for cloud-based industrial AI solutions. You will lead technical design, develop complex data visualizations, and define front-end best practices. Requires 7+ years experience, expert TypeScript, and deep React exper...
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Poland , Rzeszów
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Edvantis
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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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Not provided
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Mastercard
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Senior CAM Software Engineer
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Senior CAM Software Engineer sought in White River Junction, VT to lead development of advanced manufacturing software for complex turbomachinery. Requires 5+ years of C++ and Python experience, plus expertise in geometric modeling and CNC machining. Drive multi-axis toolpath programming, mentor ...
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United States , White River Junction, VT
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100000.00 - 130000.00 USD / Year
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Concepts NREC
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Senior Software Engineer (Python)
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Senior Software Engineer (Python) sought to build core back-end systems for cloud-based industrial AI solutions. You will design scalable, multi-tenant SaaS platforms using Python, FastAPI, and PostgreSQL, deploying to Kubernetes on Azure. This remote-first role in Poland offers flexible hours, c...
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Poland
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Edvantis
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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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Not provided
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Microsoft Corporation
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About the Senior Software Engineer - Java/Kotlin role

Explore senior software engineer jobs specializing in Java and Kotlin, a high-demand career path for experienced developers who architect and build robust, scalable software systems. Professionals in this role are pivotal in transforming complex business requirements into efficient, reliable, and maintainable applications. Typically, they engage in the full software development lifecycle, from conceptual design and technical specification to implementation, testing, deployment, and ongoing optimization. A core responsibility involves making critical architectural decisions, often designing and implementing microservices, APIs, and cloud-native solutions that form the backbone of modern digital products.

Senior software engineers in the Java/Kotlin ecosystem commonly shoulder a wide array of duties. They design and develop high-performance backend services, distributed systems, and data processing pipelines. Ensuring code quality is paramount; they rigorously write unit and integration tests, conduct thorough code reviews, and advocate for best practices in clean code and design patterns like MVC. Collaboration is a key aspect, as they frequently work alongside cross-functional teams including product managers, UX/UI designers, DevOps specialists, and other engineers to deliver cohesive user experiences. Furthermore, they often provide technical leadership, mentoring junior developers, driving technical discussions, and contributing to strategic planning and knowledge-sharing initiatives.

The typical skill set for these jobs is extensive. Mastery of Java and/or Kotlin is fundamental, complemented by deep knowledge of JVM internals, concurrency, and memory management. Proficiency with popular frameworks such as Spring Boot, Micronaut, or Quarkus is highly valued. These roles require strong experience with both SQL (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB, Cassandra) databases, as well as expertise in designing RESTful and often GraphQL APIs. Familiarity with cloud platforms (AWS, Azure, GCP), containerization (Docker, Kubernetes), and CI/CD pipelines is standard for deploying and managing applications. A strong understanding of software architecture principles, including event-driven and serverless designs, is essential.

Candidates seeking senior software engineer jobs are generally expected to possess a bachelor's degree in computer science or a related field, along with 5+ years of professional development experience. Beyond technical acumen, success in this senior role demands excellent problem-solving abilities to debug complex issues, a proactive approach to learning emerging technologies, and strong communication skills to articulate technical concepts to both technical and non-technical stakeholders. This career offers the opportunity to work on challenging problems, influence technology stacks, and build systems that serve millions of users, making it a cornerstone role in the technology industry.

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