Backend Software Engineer Internship

Join Reltio as a Software Engineering Intern and embark on a journey to enhance your coding skills and gain hands-on experience in a dynamic tech environment. You will work closely with our talented engineering team, contributing to innovative projects and learning from industry experts.

Internship Overview evolution is looking for a Backend Engineering Intern to join the team in Lisbon. This position offers hands-on experience with real projects and the chance to work closely with seasoned engineers. What to Expect Collaborate with the engineering team on active backend projects Gain practical skills and learn from experienced colleagues Contribute ideas and support ongoing development work This internship is designed for those eager to grow technical abilities in a supportive, team-driven setting.

SingleStore is offering a paid, 12-week Software Engineer Internship in Lisbon, Portugal for Summer 2026. This program places interns within the Engine group, where hands-on learning and mentorship from experienced engineers are central. The internship is designed to help students develop technical skills while contributing to meaningful projects. What you will do Join a small, collaborative engineering team focused on improving SingleStore’s database engine Work on projects that span the full product life cycle, from design and coding to testing and deployment Explore technologies such as large language models (LLM) and vector indexing Enhance the fault tolerance of SingleStore clusters Optimize SQL query performance using methods like SIMD and LLVM code generation Develop modules for query optimization, including search and costing components Write and test software, gaining exposure to both technical and business aspects Interns can expect support from engineers who value mentorship and professional growth. There are also opportunities to learn about other business areas, including product, marketing, and sales. Teamwork and celebrating shared successes are part of the culture, with group meals and outings in and around Lisbon. Requirements Currently enrolled in a Bachelor’s program in Computer Science, Computer Engineering, Electrical Engineering, or a related field Strong understanding of computer science fundamentals Proficiency in C++ or C Interest in building reliable software Solid grasp of algorithms and data structures Preferred experience Previous internship in software development

SingleStore is hiring a Software Engineer Intern to join the Helios team in Lisbon, Portugal for Summer 2026. This is a paid, 12-week internship designed to provide hands-on experience with real-time technologies that support business operations around the globe. Internship Experience Interns at SingleStore work side by side with engineering teams, contributing directly to projects that move quickly from concept to production. Each intern takes ownership of a project, following it through the full product lifecycle. Throughout the program, experienced engineers provide mentorship and share both technical and business insights. Collaboration extends beyond engineering, with opportunities to work with product, marketing, and sales teams. Achievements are celebrated together, both in the office and at events across Lisbon. What you will do Join small teams to develop and test new product features Deploy code to production incrementally during the internship Experience the full software development process from start to finish Build a broad understanding of SingleStore’s products and business Requirements Currently enrolled in a Bachelor’s program in Computer Science, Electrical Engineering, Computer Engineering, or a related field Strong foundation in computer science fundamentals Proficiency in at least one programming language: JavaScript, Golang, or TypeScript Interest in creating highly reliable software Solid understanding of algorithms and data structures Preferred experience Familiarity with operating systems, distributed systems, concurrency, multithreading, or server architectures

The Product Engineer for New Product Development at Haworth International focuses on bringing innovative furniture concepts to life. Based in Lodz, this role ensures new designs are technically feasible and profitable, balancing creativity with practical engineering and cost considerations. Key responsibilities Product design and development: Use CAD software to create and refine furniture concepts. Develop detailed product specifications that reflect customer needs. Ensure each design meets standards for safety, efficiency, and effectiveness. Research and feasibility: Carry out research and feasibility studies to identify opportunities for new products or improvements. Analyze market trends and customer feedback to spot areas for growth. Prototyping and testing: Test prototypes to identify and resolve design issues. Evaluate prototypes for durability, functionality, and regulatory compliance. Quality assurance and compliance: Ensure all products meet required safety standards and regulations. Support testing and quality control to confirm product performance. Cross-functional collaboration: Work closely with design, production, marketing, and sales teams to align products with customer and business needs. Offer technical guidance to sales and marketing on product features and benefits. Production oversight: Oversee manufacturing and production processes, setting standards and seeking ways to improve efficiency. Analyze workflows to find cost-saving opportunities. Continuous improvement: Update and enhance existing products to stay competitive. Implement changes efficiently and cost-effectively, based on careful analysis. What this role involves Developing and implementing technical solutions for new furniture products Performing cost calculations to support product profitability Ensuring products comply with safety and quality standards Collaborating across teams to deliver products that meet customer expectations

Join GoCardless: Pioneers in Global Payment SolutionsAt GoCardless, we are redefining how businesses manage their payments. With a trusted platform utilized by over 100,000 businesses, ranging from budding startups to renowned brands, we facilitate seamless payment collection and disbursement through direct debit, real-time payments, and open banking.We proudly process over US$130 billion in payments annually across more than 30 countries, empowering our clients to effortlessly handle both recurring and one-off payments—all without the hassle of chasing payments or incurring hefty fees. Our innovative AI-driven solutions enhance payment success rates and minimize fraud. Through our open banking connections with over 2,500 banks, we enable our clients to make informed, swift financial decisions.Headquartered in the UK, with offices in London and Leeds, we have expanded our footprint to Australia, France, Ireland, Latvia, Portugal, and the United States.At GoCardless, we prioritize an inclusive and supportive hiring process. If you need any accommodations or assistance, please reach out to our Talent Partner—we're here to support you!If this opportunity excites you, we encourage you to apply, even if you do not meet every single requirement!Engineering Excellence at GoCardlessAs a Software Development Engineer at GoCardless, you will face a variety of technical challenges, from simplifying banking schemas to optimizing dashboard rendering times.You will thrive in our environment if:You aspire to foster a vibrant engineering culture at GoCardless and within the broader tech community.You enjoy collaborating with diverse teams and learning from varied experiences.You take pride in your contributions and their positive impact on real users.Our engineers actively shape the engineering landscape, contributing to Open Source Software initiatives (visit our Github) and sharing insights through post-mortems, conferences, and on our blog.

Role overview GoCardless is looking for a Senior Software Development Engineer based in Lisbon, Portugal. The main focus is on developing and refining software that helps businesses handle payment processing more easily across the globe. What you will do Collaborate with engineers to design, build, and launch new product features Improve existing systems with an emphasis on performance and security Support a dependable and user-friendly experience for customers The team This engineering group values quality and the impact of their work. Team members prioritize collaboration and technical skill in their daily projects.

At Arkadium, we believe in the joy of creating fun experiences, and for the past 20 years, we have done just that. As the creators of some of the world’s most-played games, including the iconic Solitaire that has graced countless Windows machines, our games are available on Arkadium.com, iOS, Android, and numerous prominent platforms worldwide.As a proud Evergreen business, our core values of Fierce Drive, Positive Energy, and Living Full Lives guide our operations and decisions.We are a privately held company (ensuring stability and a balanced approach to growth), founder-led (demonstrating passion for our craft), and we consistently earn accolades as a “Best Place to Work” – we are not your average gaming company.Recognized by 'Happiness Works' in 2023, 2024, and 2025 in Portugal, alongside 'Crain's Best Places to Work 2022' and 'Great Place to Work 2022 and 2023' in New York, we take pride in our culture!If you're excited about becoming an Arkadian, we would love to hear from you!OverviewArkadium is on the lookout for an outstanding and seasoned Senior Full-Stack Engineer to join our Core Tech team.Our Core Tech team operates with a backend-first philosophy, developing and refining shared services that power essential functionalities in Arkadium’s games and platforms. This includes authentication, chat, tournaments, friend systems, inventory management, microtransactions, and multiplayer infrastructure (Nakama) among other platform-wide capabilities.What You’ll DoLead the technical direction and delivery of complex, scalable full-stack systems utilized by live games.Design and make architectural decisions for backend and frontend systems, striking a balance between performance, scalability, and long-term maintainability.Develop and enhance backend services and APIs that support real-time, live-operated games.Seamlessly integrate backend systems with web-based frontends and browser games.Empower internal game teams by creating shared services, frameworks, and developer tools.Design, implement, and maintain reliable data models focusing on accuracy, security, and high performance.Identify performance bottlenecks throughout the stack and proactively initiate optimizations.Establish and uphold security standards for authentication, authorization, and data protection.Set engineering quality benchmarks through code reviews, architectural guidance, and mentoring.Create clear technical documentation and decision records to facilitate long-term ownership and knowledge transfer.Stay updated with modern backend, frontend, and infrastructure practices while continuously raising the technical standards of the team.Collaborate closely in an agile environment, contributing to planning, execution, and ongoing improvements.

SingleStore offers a 12-week Software Engineer Internship on the Platform team in Lisbon, Portugal for Summer 2026. This internship places interns alongside experienced engineers, contributing to projects that support real-time technologies used by businesses around the world. The team values quick release cycles, collaboration, and creative problem-solving. Interns see their work make a visible impact, with chances to join team outings and explore Lisbon together. What you will do Take responsibility for assigned projects from start to finish, with guidance from mentors. Participate in the entire product lifecycle, working closely with engineering, product, marketing, and sales teams. Contribute to SingleStore’s internal testing platform, which helps ensure the reliability and scalability of the database engine. Develop new features, write tests, and help improve the platform’s user experience. Platform team focus The Platform team builds and maintains systems that increase productivity for SingleStore’s engineering organization of over 180 people. Interns play a role in strengthening the internal testing platform, directly supporting the quality of SingleStore’s core technology. Mentorship and growth Interns receive support from engineers committed to their professional development, gaining exposure to both technical and business aspects of software engineering. Collaboration with cross-functional teams is an essential part of the internship experience.

Join GoCardless as a Software Development Engineer IIAt GoCardless, we are redefining the way businesses manage their payments. As a leading global bank payment provider, we empower over 100,000 businesses — from innovative start-ups to renowned enterprises — to seamlessly collect and send payments using direct debit, real-time payments, and open banking.With an impressive processing volume exceeding US$130bn annually across more than 30 countries, we facilitate both recurring and one-time payments without the hassles of chasing payments or incurring prohibitive fees. Our cutting-edge AI-powered solutions enhance payment success rates while minimizing fraud. We are proud to connect with over 2,500 banks worldwide, enabling our clients to make faster, informed decisions.Headquartered in the UK, with offices in London, Leeds, Australia, France, Ireland, Latvia, Portugal, and the United States, GoCardless is committed to fostering an inclusive and accessible workplace. If you require any support or adjustments during the hiring process, please contact your Talent Partner — we are here to assist you!We understand that you may not meet every single requirement. If you are passionate about this role, we encourage you to apply!Engineering at GoCardlessAs a Software Development Engineer II, you will tackle a variety of technical challenges, from simplifying banking schemes to optimizing dashboard performance. You'll thrive in our engineering culture if:You are eager to promote an exceptional engineering culture both at GoCardless and within the broader tech community.You enjoy collaborating with diverse teams and learning from individuals with different backgrounds.You take pride in your work and its positive impact on real customers.Our engineers actively contribute to the engineering community by engaging in Open Source Software projects (check out our Github) and sharing insights through post-mortems, conferences, and our blog.

Role overview Jobgether is hiring a Senior Software Engineer for Product Engineering in Portugal. This position focuses on building and refining products that address customer needs. Expect hands-on development work and frequent collaboration with colleagues from various departments. What you will do Design and develop software products, guiding new features from initial idea through to launch Maintain and improve existing solutions to support reliability and strong performance Collaborate with cross-functional teams to deliver well-tested releases Help advance engineering practices and processes Location This position is based in Portugal.

Join the Tripadvisor Group, where we connect people with unforgettable experiences and strive to be the world's most trusted source for travel and adventure. Utilizing our vast portfolio of travel brands and advanced technology, we aim to engage a global audience and facilitate meaningful connections with our partners across diverse travel categories including accommodations, restaurants, and unique experiences. The Tripadvisor Experiences Engineering team, distributed across Europe, plays a pivotal role in managing Tripadvisor.com and our mobile applications, alongside the supporting infrastructure. We empower operators to grow their businesses while enabling third parties to leverage our comprehensive inventory. Our dedicated team provides essential tools that support our customer service representatives in delivering exceptional service to travelers and operators worldwide. We are in search of a Senior Software Engineer to become part of our dynamic team. This position is available to candidates who can commute (generally within a 2-hour radius) to one of our office hubs in Lisbon. We appreciate flexibility in work arrangements and value the importance of in-person interactions for collaboration and connection. Expect a remote-first work model complemented by periodic office gatherings for team planning and engagement. At Tripadvisor, our engineers thrive on tackling a diverse array of technical challenges. This backend-focused full-stack role primarily involves backend development, with opportunities to engage in frontend projects as well. While a willingness to learn is essential, expertise in frontend development is not required at the outset, as we offer on-the-job training. Our collaborative environment is designed for productivity, where engineers work closely with product managers and designers throughout the entire software development lifecycle—from design and coding to testing and deployment. Most engineers deploy code to production every few days within our daily release cycle. The technology stack at Tripadvisor includes Java, React, Typescript, GraphQL, Kubernetes, SQL, and NoSQL databases on AWS. While strong proficiency in Java is mandatory, familiarity with the entire stack is not a prerequisite; a passion for learning is what we value most. Why Work with Us? Competitive compensation packages, including base salary, annual bonuses, and more. “Work your way” approach offering flexibility to cater to your lifestyle and needs.

Join our innovative team as a Senior Software Engineer at Inetum in Lisbon. We are seeking a passionate individual who excels in software development and thrives in a collaborative environment. As a Senior Software Engineer, you will play a pivotal role in designing and implementing cutting-edge software solutions that meet our clients' needs.Ideal candidates will possess a strong background in software engineering, a knack for problem-solving, and the ability to mentor junior engineers. You will work closely with cross-functional teams to deliver high-quality products while ensuring best practices in software development.

Join Reltio as a Software Engineer Intern and immerse yourself in an innovative environment where technology meets creativity. As an intern, you will work alongside experienced engineers, contribute to exciting projects, and gain hands-on experience in software development. This is a fantastic opportunity to enhance your skills and build a foundation for your career in tech.

Join Cross Border Talents as a Software Engineer, where you will play a pivotal role in understanding project objectives and phase-specific requirements.Your key responsibilities will include:Grasping the overall project vision and contributing to phase-wise requirements.Executing tasks aligned with specific requirements and ensuring the quality and timeliness of deliverables.Collaborating with team leads and members to devise optimal solutions.Participating in the review of test plans for various phases and integrations.

Join Dashlane as a Junior Backend Software Engineer and embark on a journey to enhance user security and experience. In this role, you will collaborate with seasoned engineers to design and develop backend solutions that power our innovative password management platform.As a key member of our engineering team, you will engage in coding, debugging, and testing applications while contributing to architecture discussions. This is an excellent opportunity for those eager to learn and grow in a supportive environment.

Why Choose VerifoneWith over three decades of excellence, Verifone has carved a prominent niche in the electronic payment technology sector. Recognized as a leading brand in electronic payment solutions, we are one of the largest global providers of electronic payment systems.At Verifone, our vibrant and diverse work environment fosters a results-driven culture where employees are empowered to excel. Collaborating with top retailers, merchants, banks, and partners worldwide, we are committed to delivering innovative payment solutions. Our obsession with excellence and customer satisfaction drives our team to lead the industry through ingenuity and an ambitious mindset. Whether it’s advancing secure payment systems or exploring new market opportunities, every Verifone employee is dedicated to the success of our customers and partners. This passion for innovation fuels personal and professional growth.We embrace an in-office culture, recognizing the immense benefits of co-location for career advancement and business outcomes. Currently, we offer a hybrid work schedule, with continual evaluations of our attendance policy.

Are you an accomplished software engineer with a fervor for innovation? Do you excel in collaborative settings, keen to leave your mark on the technology landscape? We invite you to become a part of our vibrant team as a Lead Software Engineer, where you will play a pivotal role in pushing the boundaries of technology!Your ResponsibilitiesDesign and implement state-of-the-art web applications using industry-leading web development practices.Engage in close collaboration with product owners, business analysts, and quality assurance teams to ensure seamless integration and delivery.Work alongside back-end developers to integrate user interface components with APIs and databases.Participate actively in agile ceremonies, fostering an environment of innovation and efficiency.Partner with product owners to create resilient, maintainable systems that meet business needs.

Join our dynamic team at Renesas Electronics as a Senior Backend Software Engineer. In this critical role, you will leverage your expertise to develop and enhance cutting-edge backend solutions that power our innovative products. You will collaborate with cross-functional teams to design scalable systems, ensuring high performance and reliability.