Software Engineer Intern, Helios (Summer 2026)

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.

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

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.

About UsAt Cloudflare, we are dedicated to creating a better Internet. As one of the world's largest networks, we empower millions of websites and online properties for a diverse range of clients, from solo bloggers to Fortune 500 enterprises. Our technology accelerates and protects Internet applications without the need for additional hardware, software installation, or code alterations. Every Internet property utilizing Cloudflare benefits from our intelligent global network, which continually enhances its capabilities with each request, leading to improved performance and reduced spam and attacks. We've been recognized as one of Entrepreneur Magazine's Top Company Cultures and ranked among Fast Company's Most Innovative Companies.We seek individuals who are proactive and innovative, ready to tackle the challenges of the Internet rather than settling for the status quo. We value those with a keen eye for identifying common issues and a curiosity driven by AI to develop solutions using cutting-edge tools. Our culture thrives on iterative improvement, leveraging AI to enhance our offerings today for a better tomorrow, and ensuring that all advancements, big or small, are shared across the team to foster collective growth. If you prioritize curiosity over rigidity and see AI as a collaborator in addressing complex problems, you will thrive here. Available Location: Lisbon, PortugalJob Title: Industry-Focused Analyst InternAbout The TeamThe CxO Transformation Partners (CXTP) team acts as trusted advisors to Cloudflare’s senior customers and prospects. We are a strategic group simplifying technical complexities while aligning solutions with large-scale business goals. Our mission is to unlock commercial outcomes by bridging the gap between deep technical expertise and executive-level strategies.About The InternshipThis internship focuses on conducting in-depth industry research and competitive landscape analysis to bolster our team's capacity to customize solutions and messaging for key markets. Key deliverables will include reports on cybersecurity trends, comprehensive mapping of offerings to industries, and competitive assessments. Your contributions will facilitate more informed and targeted engagements with executive customers and assist in the creation of thought leadership content, positioning Cloudflare as a leader in specialized cybersecurity.

Join Dashlane as a Backend Software Engineer Intern and take the first step in your career by contributing to our innovative projects. In this role, you will collaborate with our talented engineering team to develop robust backend solutions that enhance user experience and ensure data security.

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.

Role Overview Renesa Electronics is hiring a Software Systems Engineer in Lisbon. This role focuses on designing, developing, and implementing software systems that support the company’s electronics products. What You Will Do Create and improve software systems for electronics solutions Work with colleagues from different departments to integrate software with hardware products Support the performance and reliability of existing and new products Location This position is based in Lisbon.

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 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 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.

Join our client, an innovative early-stage startup based in Lisbon, as they seek dynamic and ambitious Software Engineers eager to advance their careers in a fast-paced startup environment. The company is actively growing and is eager to onboard talented technical professionals.Requirements We are looking for passionate individuals who thrive on technology and excel in building, experimenting, and problem-solving. The technical stack remains adaptable, making this role perfect for those who enjoy diversity and wish to influence the engineering trajectory.You may be an ideal candidate if you: Are at the beginning of your career, ready for rapid growth Or are an experienced engineer residing in Lisbon and open to new ventures Engage in side projects or passion initiatives that demonstrate your self-driven motivation Enjoy exploring emerging technologies and taking initiative Flourish in a startup environment where your ideas can create real impact Why consider this opportunity? Experience the chance to grow alongside a startup that appreciates initiative and curiosity Enjoy the freedom to influence technical decisions and shape future products Collaborate with a dedicated, ambitious team Benefit from strong career development opportunities for individuals ready to accelerate their growth BenefitsEquity participation in the venture alongside a competitive salary Support for tax services (accountant fees, returns, and related services covered) Accelerated learning curve in a venture studio environment 24 paid vacation days per year Hybrid work model (Lisbon-based) Pet-friendly office and regular team events

About the Role Renesas Electronics Corporation is hiring a Senior Backend Software Engineer in Lisbon. This role focuses on designing, building, and maintaining backend systems that support Renesas products. What You'll Do Develop and maintain backend software components Work with cross-functional teams to deliver reliable solutions Contribute to the architecture and performance of core systems Location This position is based in Lisbon.

About Air AppsAt Air Apps, we embrace a vision of expansive thinking and agile execution. Founded by a family in 2018, our mission is to revolutionize planning with the world's first AI-powered Personal & Entrepreneurial Resource Planner (PRP). With our roots in Lisbon, Portugal, and additional offices in San Francisco, we have successfully maintained self-funding while achieving over 100 million downloads globally.Our commitment to long-term innovation drives us to continually challenge conventional wisdom, expanding the frontiers of AI-driven solutions that genuinely transform lives. Here, you will play a pivotal role in crafting products that empower individuals worldwide.Join us on our mission to redefine resource management and make a lasting impact.The RoleAs a Backend Software Engineer, you will take charge of designing, developing, and maintaining the server-side components of our applications. You will work collaboratively with product managers, frontend developers, and other cross-functional teams to deliver robust and scalable backend services that enable essential features and foster rapid growth.Please be aware that this posting is intended to expand our talent pool while we prepare to officially launch the job. We will reach out to you as soon as it becomes available.ResponsibilitiesAPI & Service Architecture - Design and implement RESTful or GraphQL APIs, microservices, and business logic utilizing Node.js and TypeScript.Database Design & Integration - Model and manage data queries using Supabase and PostgreSQL, including functions, row-level security, and real-time features.Cloud Infrastructure - Deploy and oversee services on Google Cloud Platform (GCP), particularly with Cloud Run, Cloud Functions, IAM, and Pub/Sub.Code Quality & Testing - Create clean, testable code utilizing unit, integration, and end-to-end testing frameworks (e.g., Jest). Participate in code reviews and uphold quality assurance practices.Security & Reliability - Develop secure-by-default solutions for authentication, authorization, and data protection, adhering to Clean Code and Clean Architecture principles.Monitoring & Operations - Establish logging, monitoring, and operational practices to ensure system reliability.

About DashlaneDashlane is dedicated to providing essential credential security that empowers every business and employee to succeed. Trusted by millions of consumers and over 25,000 businesses globally—including prominent brands like Michelin, Air France, and Forrester—Dashlane is known for its innovative solutions, patented zero-knowledge security, and exceptional user experience. Established in Paris and with offices in New York and Lisbon, Dashlane is proud to have a diverse team of over 300 Dashlaners worldwide.We seek individuals who leverage AI tools to enhance efficiency, creativity, and impact in their roles. At Dashlane, we prioritize innovation and continuous learning, uphold excellence in all our endeavors, and foster a cohesive team environment. Discover more about life at Dashlane, including how we work, how we hire, and the benefits of being a Dashlaner.About the RoleJoin one of our talented product development teams focused on feature development, primarily aimed at driving the company’s business growth through projects like enhancing our pricing strategy, improving trial and payment experiences, and refining onboarding processes.

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.

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.

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.

SingleStore is seeking a Software Engineer - University Graduate to join the team in Lisbon, Portugal. This entry-level role centers on building real-time technology that supports business operations worldwide. Engineers here see projects through every stage, from initial design to deployment, and collaborate closely with experienced team members. The culture values teamwork, creative problem-solving, and celebrating milestones together. Role overview This position offers hands-on experience with the full product lifecycle. Engineers contribute directly to meaningful projects and have the opportunity to learn from seasoned colleagues. The team often works together in a collaborative setting and enjoys social activities outside the office as well. What you will do Develop new features using technologies like WASM Enhance fault tolerance in SingleStore clusters Optimize SQL query performance using SIMD and LLVM code generation Design and implement search and cost modules for the query optimizer Participate in all phases of development, including coding and testing Engineers in this role work closely with a small team and gain insight into various aspects of the business. Requirements Bachelor’s degree in Computer Science, Electrical Engineering, Computer Engineering, or a related field Strong grasp of computer science fundamentals, such as operating systems, concurrency, multithreading, and server architectures Proficiency in C++ or C programming Solid understanding of algorithms and data structures Interest in developing highly reliable software

Join inetum2 as a .NET Software Engineer and take your career to the next level! We are looking for passionate individuals who thrive in a dynamic environment and are eager to contribute to innovative projects. You will collaborate with a talented team to design, develop, and maintain software solutions that drive our business forward.