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Senior Software Engineer - Core Jobs (Remote work)

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Senior Software Engineer
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Senior Software Engineer (C++ / Algorithms) sought to build a high-performance visualization engine in the UK. This role demands strong C++ skills, deep computer science fundamentals, and a passion for solving complex algorithmic and graphical problems. Join a culture of technical excellence, foc...
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United Kingdom
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200000.00 GBP / Year
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Oho Group Ltd
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Senior Software Engineer - Azure Hyper Networking
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Senior Software Engineer – Azure Hyper Networking. Build and optimize the software-defined network infrastructure powering Microsoft’s global cloud and AI data centers. Requires expertise in C, C++, C#, or Python, large-scale distributed systems, and switch/router configuration. Join a team at th...
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Serbia , Multiple Locations
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Not provided
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Microsoft Corporation
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Senior Software Engineer, Data Management
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Senior Software Engineer, Data Management – Bogotá, Colombia. Design and build scalable APIs and distributed systems to power Fullstory’s AI-enhanced products. Drive zero-configuration features, manage services that auto-label user event data, and collaborate on design and code reviews. Leverage ...
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Colombia , Bogotá
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80000.00 - 89000.00 USD / Year
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Fullstory
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Senior Software Engineer (Rocks)
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Senior Software Engineer (Rocks) sought by Invent.ai, a fast-growing AI firm revolutionizing retail supply chain. You will own end-to-end development across Python/PySpark, AWS Lambda, and React, leveraging AI coding tools to accelerate delivery. Requires 6+ years in scalable SaaS, deep OOP knowl...
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United States
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Not provided
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invent.ai
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Senior Software Engineer - Applications
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Senior Software Engineer - Applications: Build and scale high-throughput backend services and messaging infrastructure for healthcare platforms. Leverage Ruby on Rails, JavaScript, and PostgreSQL to design reliable APIs and distributed systems. Drive technical ownership of complex features, from ...
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United States
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60.00 - 80.00 USD / Hour
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Signify Technology
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Senior Software Engineer
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Senior Software Engineer – Firefox Monitor. Build cloud-native Node.js/TypeScript systems at the intersection of security and privacy. Lead backend development, own GCP/AWS infrastructure, and optimize PostgreSQL at scale. Join Mozilla to protect millions from data breaches with top benefits and ...
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United States; Canada
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Not provided
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Mozilla
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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 (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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Not provided
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Edvantis
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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 (AWS & Data)
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Senior Software Engineer (AWS & Data) – remote role in Poland. Build cloud-native apps and data pipelines using AWS Glue, PySpark, ECS/Kubernetes, FastAPI, and React. Requires strong DevOps skills with Terraform and CI/CD. Enjoy full remote work, private medical care, Multisport card, and life in...
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Poland
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130.00 - 150.00 PLN / Hour
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Cyclad Sp. z o.o.
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Senior Software Engineer - Github Copilot API
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Join GitHub as a Senior Software Engineer on the Copilot API team, building scalable backend services and APIs for the world’s leading AI pair programmer. You’ll design distributed systems, ensure high reliability and performance, and mentor engineers across multiple locations in Czech Republic. ...
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Czech Republic , Multiple Locations
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Microsoft Corporation
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Senior Software Engineer
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Senior Software Engineer sought to design and deliver scalable micro frontend architectures using React, TypeScript, and NestJS. This UK-based role focuses on building high-performing, secure applications with a DevSecOps mindset. You will mentor engineers, drive CI/CD improvements, and shape tec...
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United Kingdom
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Admiral Group Plc
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Senior Software Engineer - Engineering Workflow and CI
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Mozilla seeks a Senior Software Engineer to enhance developer productivity by improving Firefox’s CI/CD and engineering workflows. You’ll build Python-based services, optimize testing pipelines, and work cross-platform (Windows, Linux, Mac). Ideal for experts in FastAPI, GCP/AWS, and GitHub Actio...
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Sweden, Germany, France, UK, Finland, Belgium, Spain, Netherlands
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Mozilla
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Senior Software Engineer (Golang)
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Senior Software Engineer (Golang) needed in Minneapolis to design scalable backend systems and high-performance microservices. Requires 8+ years of experience, 3+ years with Golang, and deep AWS expertise. You will build APIs, containerize apps with Docker, and optimize MySQL databases. Benefits ...
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United States , Minneapolis
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69.00 USD / Hour
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Apex Systems
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Senior Software Engineer - Azure Storage
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Join Microsoft Azure Storage as a Senior Software Engineer on the Ultra Disk team, building the fastest block storage platform in the cloud. Design and implement scalable, high-performance distributed systems for exascale data, using C, C++, C#, or Python. Based in multiple US locations, this rol...
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United States , Multiple Locations
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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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Invert seeks a Senior Software Engineer to join our remote-first team in San Francisco. You will leverage 6+ years of experience with Python, React, TypeScript, and AWS to ship features and mentor engineers. Drive technical decisions for sustainable scaling in bioprocessing automation. Enjoy comp...
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United States , San Francisco
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130000.00 - 200000.00 USD / Year
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Helpcare AI
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Senior Software Engineer II
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Senior Software Engineer II – Confluent, India (Remote-First). Design and scale the Kora Serverless platform, Confluent’s cloud-native Kafka service. Requires 6+ years of experience, deep expertise in distributed systems, and proficiency in Java/Scala. Join a collaborative team building high-perf...
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India
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Not provided
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Confluent
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Senior Software Engineer, Android
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Senior Software Engineer, Android – Prague, Czechia. Join the Corrigo Platform team to build a leading CMMS enterprise solution. You need 6+ years of Android experience, expertise in Java, Kotlin, Jetpack Compose, and Clean Architecture. Develop new features, write clean code, and collaborate wit...
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Czechia , Prague
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JLL
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Senior Software Engineer
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Join a leading AI and software engineering firm in Oklahoma City as a Senior Software Engineer. Drive innovation on enterprise products using .NET, C#, Angular, and modern CI/CD practices. Enjoy a collaborative Agile environment with full benefits, including medical, dental, and 401(k). Lead feat...
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United States , Oklahoma City
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Robert Half
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Senior Software Engineer
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Join our Core Gateway team as a Senior Software Engineer. You will design and own critical backend systems for our global, high-volume payment platforms. We require expertise in C#/PHP, cloud environments (GCP/AWS), and building secure, scalable systems. Enjoy a remote-first culture, flexible wor...
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50000.00 - 65000.00 GBP / Year
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Parking Network B.V.
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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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