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Senior Software Engineer - Core Jobs

3184 Job Offers

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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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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 Specialty Software Engineer - Capital Markets Reference Data
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Senior Specialty Software Engineer needed for Wells Fargo’s Capital Markets Reference Data Platform in Charlotte, NC. Design and build high-performance Java microservices for financial instrument data ingestion and distribution. Requires 4+ years in Java 17+, Spring ecosystem, and SQL optimizatio...
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United States of America , Charlotte
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Wells Fargo
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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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Capital Market Electronic Trading Specialty Software Engineering Senior Manager
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Lead hands-on engineering teams building low-latency electronic trading platforms at Wells Fargo in New York or Charlotte. This Senior Manager role combines people leadership with deep technical contribution, requiring 7+ years of experience in capital markets and high-throughput systems. You wil...
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United States , New York; Charlotte
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185000.00 - 300000.00 USD / Year
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Wells Fargo
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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 Manager, Software Engineering
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Senior Manager, Software Engineering role in Hyderabad, India, leading mobile and backend development with React Native, Python, and Java. Drive digital transformation at PepsiCo, owning full-stack architecture, DevOps, and AI-assisted coding tools like GitHub Copilot. Requires 15+ years of exper...
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India , Hyderabad
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Pepsico
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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 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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Microsoft Corporation
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Senior Software Engineer
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Join Microsoft as a Senior Software Engineer in Redmond, WA, to shape the future of OneDrive and SharePoint. Design scalable systems for cloud migration, enhance core performance, and ensure zero customer impact. Requires a BS in CS or equivalent with 4+ years in C++, C#, Java, or Python. Drive b...
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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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Join Microsoft Security as a Senior Software Engineer in Redmond, WA. Design and ship core security capabilities with C, C++, C#, Java, JavaScript, or Python. Drive least-privilege and data-protection solutions in high-throughput, multi-tenant environments. Requires a Bachelor’s in CS + 4 years’ ...
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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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About the Senior Software Engineer - Core role

Explore Senior Software Engineer – Core jobs and discover a pivotal career at the heart of technology innovation. A Senior Software Engineer in a Core capacity is a seasoned professional responsible for designing, building, and maintaining the fundamental, business-critical systems and services that power modern applications. This role is central to an organization's technical infrastructure, focusing on creating robust, scalable, and high-performance platforms that serve as the backbone for other products and features. Professionals in these jobs move beyond feature development to solve deep architectural challenges, ensuring the entire ecosystem is reliable, efficient, and secure.

Typical responsibilities for a Senior Core Software Engineer involve architecting and implementing scalable, cloud-native systems and distributed computing solutions. They write clean, maintainable, and thoroughly tested code with a strong emphasis on performance, reliability, and fault tolerance. A key part of the role is designing and optimizing data storage and retrieval mechanisms, often working with relational and non-relational databases. These engineers actively collaborate with cross-functional teams, including product management, DevOps, Site Reliability Engineering (SRE), and quality assurance, to define technical roadmaps and operational excellence. They are also tasked with mentoring junior engineers, conducting code reviews, and establishing best practices for the entire engineering organization.

The typical skill set and requirements for these high-impact jobs are comprehensive. Candidates generally possess 5+ years of progressive software development experience, with deep proficiency in one or more backend-oriented languages such as Go, Java, C#, or Python. A strong foundation in computer science fundamentals—data structures, algorithms, and system design—is essential. Practical expertise with modern cloud platforms (AWS, Azure, GCP), containerization (Docker), and orchestration (Kubernetes) is standard, as is experience with microservices architecture and API design. A security-first mindset and understanding of DevOps principles, including CI/CD pipelines and infrastructure as code, are highly valued. Beyond technical acumen, successful Senior Core Engineers demonstrate exceptional problem-solving abilities, a passion for elegant and scalable design, and the leadership skills to drive complex projects from conception to deployment. If you are seeking jobs where you build the foundational technology that enables everything else, a Senior Software Engineer – Core position represents the pinnacle of backend engineering challenges and opportunities.

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