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Senior Software Engineer Jobs

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Senior Python Software Engineer
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Join our Warsaw team as a Senior Python Software Engineer & Consultant. This hybrid role requires 5+ years of Python expertise, Python Agent knowledge, and strong B2 communication skills in Polish and English. Enjoy flexible hours, a cafeteria system, mentoring, and a supportive culture while dri...
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Poland , Warsaw
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Inetum
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Senior Software QA Engineer
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Join Inetum Polska in Warsaw as a Senior Software QA Engineer. Design and automate tests with Playwright/JavaScript for a key telecom e-commerce platform. Enjoy a hybrid model, flexible hours, and strong development support in an inclusive culture.
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Poland , Warsaw
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Inetum
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Senior .Net Software Engineer
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Join our Warsaw team as a Senior .NET Software Engineer. Develop a custom CRM and back-end systems using C#, .NET, and SQL for a global telecom client. Enjoy a hybrid model, flexible hours, and strong mentorship in a supportive culture.
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Poland , Warsaw
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Inetum
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Gsuite Senior Software Engineer
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Join our team in Noida as a Senior Software Engineer specializing in Gsuite and cloud solutions. You will design scalable applications using AWS, Node.js, and Angular/React, with direct client engagement. This role offers high independence and an inclusive, respectful work environment for all.
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India , Noida
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Sopra Steria
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Axway B2B Senior Software Engineer
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Seeking a Senior Axway B2B Software Engineer in Noida. This role demands strong Unix/Linux, SQL, and networking skills for L2/L3 support and production upgrades. Expertise in Track & Trace products, especially Axway, and the healthcare serialization domain is essential. You will engage directly w...
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India , Noida
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Sopra Steria
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Senior JVM Software Engineer
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Seeking a Senior JVM Software Engineer in Warsaw for a hybrid role. Drive feature development (70% BE/30% FE) using Java, Spring Boot, React, and PostgreSQL. Enjoy flexible hours, a cafeteria system, and a supportive culture with technical mentoring. Join a telecom project requiring 4+ years of f...
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Poland , Warsaw
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Inetum
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Senior iOS Software Engineer
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Join our Warsaw team as a Senior iOS Software Engineer, also leveraging Android expertise. Develop innovative mobile solutions using Swift, Kotlin, and modern architectures like MVVM and SwiftUI. Enjoy a hybrid model, flexible hours, and a rich benefits package including mentoring and a cafeteria...
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Poland , Warsaw
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Inetum
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Senior Python Software Engineer
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Join Inetum Polska as a Senior Python Software Engineer in Warsaw. Develop AI-driven microservices with Python, FastAPI, and PostgreSQL on Azure. Enjoy a hybrid model (3 days office/week), flexible hours, and strong mentorship in an innovative team.
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Poland , Warsaw
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Inetum
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Senior Software Engineer
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Join UpGuard's mission to protect the world's data as a Senior Software Engineer. Design and build highly scalable SaaS features in a green-fields environment, using React, Go, and Kubernetes. Enjoy a hybrid/remote role from major Australian cities, with a collaborative team that values impact an...
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Australia , Sydney; Melbourne; Hobart; Brisbane
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UpGuard
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Freelance Senior Software Engineer
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Seeking a freelance Senior Software Engineer for a remote contract role based in Colombia. You will lead full-cycle development using React.js, Node.js, and AWS. The position requires 6+ years of experience, expertise in modern JavaScript stacks, and fluency in English and Spanish. Join a collabo...
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Colombia
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Seamless.AI
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Freelance Senior Software Engineer
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Seeking a Freelance Senior Software Engineer for a contract role in Costa Rica. Lead full-cycle development using React.js, Node.js, and AWS. Requires 6+ years' experience, fluency in English/Spanish, and expert full-stack JavaScript skills. Deliver high-quality solutions independently in a colla...
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Costa Rica
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Seamless.AI
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Freelance Senior Software Engineer
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Seeking a remote Freelance Senior Software Engineer for contract work. This role requires 6+ years of experience and expertise in React.js, Node.js, and Express.js. Fluency in both English and Spanish is essential. Lead full-cycle development and collaborate on innovative software projects from M...
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Mexico
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Seamless.AI
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Freelance Senior Software Engineer
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Join our team as a Freelance Senior Software Engineer in Uruguay. This contract role requires a bilingual expert (English/Spanish) with 6+ years' experience in full-stack JavaScript (React.js, Node.js). You will lead technical design, development, and deployment on AWS, ensuring high-quality deli...
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Uruguay
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Seamless.AI
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Senior Software Engineer
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Lead the development of high-quality software as a Senior Software Engineer. This remote US role requires 6+ years of experience and expertise in React.js, Node.js, and AWS. You will provide technical leadership, mentor a team, and drive projects using Agile methodologies.
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United States
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Seamless.AI
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Senior Java Software Engineer
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Join our Warsaw team as a Senior Java Engineer. Lead the migration of JBoss systems to a modern Spring Boot cloud environment using Java 17+, Camunda, and Kubernetes. Enjoy a hybrid model, flexible hours, and a rich benefits package including mentoring and a team-building budget. Apply your exper...
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Poland , Warsaw
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Inetum
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Senior Software Engineer
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Join a Cambridge-based quantum computing leader as a Senior Software Engineer. Develop cutting-edge cloud infrastructure using Python, AWS/Azure, and Terraform. Enjoy flexible work, equity, and collaborate with world-class innovators on revolutionary quantum AI and cybersecurity platforms.
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United Kingdom , Cambridge
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Gitmax
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Senior Frontend Software Engineer
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Join KAYAK as a Senior Frontend Engineer in Cambridge, USA. Build the Flights product used by millions, owning UI end-to-end with React/TypeScript. Enjoy great benefits like flexible hours, 4 weeks vacation, and a focus on work-life balance.
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United States , Cambridge
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KAYAK
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Senior Front-End Software Engineer
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Join KAYAK as a Senior Frontend Engineer in Kaunas. You will build innovative checkout flows and B2B platforms using React, TypeScript, and modern tooling. This hybrid role offers global collaboration, career growth funds, and extensive benefits.
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Lithuania , Kaunas
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3333.00 - 6600.00 EUR / Month
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KAYAK
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Senior Network Software Engineer
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Join Aruba, an HPE company, as a Senior Network Software Engineer in San Jose. Develop next-gen packet forwarding solutions, including stateful firewall, SDN, and scalable cloud applications. We seek an expert in C programming, networking protocols, and embedded/cloud systems with 6-10 years' exp...
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United States , San Jose
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133500.00 - 307000.00 USD / Year
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Hewlett Packard Enterprise
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Senior Software Engineer
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Join Fever's Engineering team as a Senior Software Engineer. Develop high-traffic Python applications, work with RESTful APIs, and mentor peers. Enjoy a home office anywhere in Spain, health insurance, and great discounts. Strong English and a focus on code quality are key.
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Spain
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50000.00 - 65000.00 EUR / Year
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Fever
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Senior Software Engineer jobs represent a pivotal career stage where technical expertise converges with leadership and strategic influence. These professionals are the cornerstone of software development teams, responsible for designing, building, and maintaining complex, scalable systems that power modern businesses. Moving beyond foundational coding tasks, senior engineers architect solutions, make critical technology decisions, and mentor others, ensuring both product excellence and team growth. Typically, individuals in these roles undertake a broad spectrum of responsibilities. They are deeply involved in the full software development lifecycle, from requirement analysis and system design to implementation, testing, deployment, and ongoing optimization. A core duty is architectural design, where they choose appropriate technologies, design patterns, and frameworks to create robust, secure, and scalable applications. This often involves building backend services, APIs (RESTful or GraphQL), and dynamic frontend interfaces. They ensure code quality through rigorous practices like code reviews, writing comprehensive tests (unit, integration), and establishing CI/CD pipelines. Furthermore, senior software engineers frequently collaborate with cross-functional partners, including product managers, designers, and DevOps specialists, to translate business needs into technical specifications and seamless user experiences. The skill set for these jobs is both deep and wide. Proficiency in one or more core programming languages (such as Python, Java, JavaScript/TypeScript, C#, or Go) is essential, alongside expertise in relevant frameworks and libraries for both frontend (e.g., React, Angular) and backend development. A strong grasp of data structures, algorithms, and system design principles is mandatory. Experience with cloud platforms (AWS, Azure, GCP) and their services for computing, storage, and networking is increasingly standard. Knowledge of database technologies, encompassing both SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, DynamoDB) systems, is crucial. Beyond technical acumen, senior roles demand excellent problem-solving abilities to debug complex issues and optimize performance. Soft skills are equally important; effective communication to articulate technical concepts to non-technical stakeholders, project leadership, and the ability to mentor junior developers are key differentiators. Common requirements for Senior Software Engineer jobs usually include a bachelor’s degree in computer science or a related field, although substantial equivalent experience is often acceptable. Most positions seek candidates with 5+ years of professional software development experience, demonstrating a proven track record of shipping and maintaining production systems. Employers look for individuals who exhibit end-to-end ownership of projects, a passion for continuous learning in a rapidly evolving field, and a strategic mindset focused on long-term maintainability and business impact. For those seeking to lead through technology and drive meaningful innovation, senior software engineer jobs offer a challenging and rewarding career path at the heart of the digital world.

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