Software Engineer Intern, Engine (Summer 2026)

at Single Store

Lisbon, Portugal

Position Overview

As a Software Engineer, Intern, you'll have the opportunity to spend 12 weeks working on one (or more) of the engineering teams at Single Store. As an intern, you will be at the forefront of real-time technology that’s revolutionizing how companies run their businesses every day. With release cycles throughout the year, our engineers are accustomed to moving quickly in a rapid production environment. To do this successfully, we work collaboratively and creatively across teams to maximize our opportunity for impact. We also believe it’s important to celebrate our wins together whether it be at a local spot or getting out of the city for some exploring.

As a Software Engineer Intern, you will be empowered to own your projects end-to-end and be an active contributor throughout the product life cycle. To expedite your growth path, you will partner with engineers who deeply care about your success and will lend their expertise to your professional development. Our engineers are not just technical partners/mentors, but are also business partners who are exposed to all areas of the business, working with teams such as product, marketing, and sales.

Role and Responsibilities

Our Software Engineers work on small, collaborative teams to help drive our company forward. Whether you’re exploring cutting-edge technologies like LLM and vector index, improving the fault tolerance of a Single Store cluster, accelerating the performance of SQL queries with techniques like SIMD and LLVM code Gen, or writing search and costing modules for the query optimizer, our interns are responsible for projects that are deployed into production in the next release after your internship*. Your work will include everything from writing to testing software, and you’ll gain a significant understanding of both the product and the business.*

Required Skills and Experience

Enrolled in a B.S. Degree in Computer Science, Computer Engineering, Electrical Engineering, or related discipline

Deep understanding of C.S. fundamentals

Strong programming skills with C++ or C

Passionate about building highly reliable software

Firm grasp of algorithms and data structures

Preferred skill and experience

Understanding of core C.S. fundamentals, in particular operating systems, distributed systems, concurrency, multithreading, and server architectures

Single Store delivers the cloud-native database with the speed and scale to power the world’s data-intensive applications. With a distributed SQL database that introduces simplicity to your data architecture by unifying transactions and analytics, Single Store empowers digital leaders to deliver exceptional, real-time data experiences to their customers. Single Store is venture-backed and headquartered in San Francisco with offices in Sunnyvale, Seattle, Raleigh, Boston, Lisbon, London, Bangalore, Dublin, and Kyiv.

Consistent with our commitment to diversity & inclusion, we value individuals with the ability to work on diverse teams and with a diverse range of people.

Sponsorship is available for this position and other select roles

Please note that Single Store’s COVID-19 vaccination policy requires that team members in the United States be fully vaccinated, including a booster shot with one of the United States FDA-approved vaccine options to meet in person for Single Store business or to work from one of our U.S. office locations. It is expected that this will be a requirement for this role. If an exemption and/or accommodation to our vaccination policy is requested, a member of the Human Resources department will be available to begin the interactive accommodation process.

To all recruitment agencies: Single Store does not accept agency resumes. Please do not forward resumes to Single Store employees. Single Store is not responsible for any fees related to unsolicited resumes and will not pay fees to any third-party agency or company that does not have a signed agreement with the Company.