Software Engineer - Core Database (Kernel)

Neo4j

About Neo4j: Neo4j is the graph intelligence platform that transforms data into knowledge to power the next generation of intelligent applications and AI systems. It includes enterprise-ready knowledge graphs for accurate, explainable, and governed AI; the most comprehensive, trusted, and easy-to-deploy graph capabilities across any environment and data source; and an unmatched ecosystem trusted by 84 of the Fortune 100 and supported by the world’s largest graph community. Intelligence that works. Results that matter. Built to work everywhere and integrate with everything across every cloud for dynamic, personalized, and autonomous AI systems. We deliver quicker results, contextual knowledge, and solutions that impact customers and employees across the business. Our Vision:  At Neo4j, we have always strived to help the world make sense of data.   As business, society and knowledge become increasingly connected, our technology promotes innovation by helping organizations to find and understand data relationships. We created, drive and lead the graph database category, and we’re disrupting how organizations leverage their data to innovate and stay competitive. The Role: Do you like to solve advanced and complex computer science problems? Do you want to be part of a team that values user success and where you can have intellectually honest discussions? We are looking for an experienced backend engineer who is able to solve technical challenges and deliver high-quality code to join our talented, innovative Kernel team. You will be part of a brilliant, energetic, and fun team of engineers working on the development of the storage engines, transaction handling, indexes, data import and page cache in order to build the core of the graph database! You will be part of an international team based in Malmö and London. What you will do: * Build and ship new features for the core of the leading graph database * Write high-quality, testable, and efficient code * Promote new ideas, take an active part in features discussions and roadmap prioritisation * Integrate research and technologies into the database core - the team regularly reads research papers to see if there are some new ideas to incorporate into the product * “Do what you want weeks” to work on your own product enhancements and integrations You'll thrive in this role if: * You have experience designing multi-threaded systems and algorithms * You have a deep understanding of system design, data structures, and algorithms * You are proficient in Java or a C-style programming language * You have strong troubleshooting skills * You have knowledge about performance profiling and optimisation * You have experience with leading and delivering development projects * You are humble. Being able to discuss ideas and, challenge each other to build better solutions together * You have good communication skills and a sense of humour!   You may also have experience and interest in the following: * Database management systems * Deep JVM experience * Experience with large codebases #LI-Hybrid Why Join Neo4j? Neo4j is, without question, the most popular graph intelligence platform in the world. We have customers in every industry globally, and our products are a proven product/market fit. Joining our team is an opportunity to shape the future of data and analytics. Below are just a few exciting facts about Neo4j.  * Neo4j is one of the fastest-scaling technology companies in this industry. It recently surpassed $200M in annual recurring revenue (ARR), doubling its ARR over the past three years.  * Raised the biggest funding round in database history ($325M Series F). Backed by world-class investors like Eurazeo, GV (formerly Google Ventures), and Inovia Capital, Neo4j has raised over $600M in funding and is currently valued at over $2Bn. This puts Neo4j among the most well-funded database companies in history. * 84% of the Fortune 100 and 58% of the Fortune 500 use Neo4j. Examples include Boston Scientific, BT Group, Caterpillar, Cisco, Comcast, Department for Education UK, eBay, NBC News, Novo Nordisk, Worldline, and others.  * Co-founder and CEO Emil Eifrem has built an amazing culture that prides itself on relationships, inclusiveness, innovation, and customer success. * Countless industry awards. Massive enterprises and individual developers/data scientists love Neo4j. A strong sense of community and ecosystem is built around the platform. * A recent Forrester Total Economic Impact™ Study cited Neo4j as delivering 417% ROI to customers.  Research shows that members of underrepresented communities are less likely to apply for jobs when they don’t meet all the qualifications. If this is part of the reason you hesitate to apply, we’d encourage you to reconsider and give us the opportunity to review your application. At Neo4j, we are committed to building awareness and helping to improve these issues.  One of our central objectives is to provide an inclusive, diverse, and equitable workplace for everyone to develop their potential and have a positive, career-defining experience. We look forward to receiving your application. Neo4j Values: Neo4j is a Silicon Valley company with a Swedish soul. We foster collaboration and each of us is empowered to contribute and put our innovative stamp on projects. We hire candidates who reflect the following Neo4j core values: (we)-[:VALUE]->(relationships) (we)-[:FOCUS_ON]->(userSuccess) (we)-[:THRIVE_IN]->(:Culture {type: [‘Open’, ‘Inclusive’]}) (we)-[:ASSUME]->(:Intent {direction:’Positive’}) (we)-[:WELCOME]->(:Discussions {nature: ‘IntellectuallyHonest’}) (we)-[:DELIVER_ON]->(ourCommitments)  Neo4j is committed to protecting and respecting your privacy. Please read the privacy notice regarding Neo4j's recruitment process to understand how we will handle the personal data that you provide.  More information at www.neo4j.com.   ©2026 Neo4j, Inc., Neo Technology®, Neo4j®, Cypher®, Neo4j Bloom™, Neo4j Graph Data Science Library™, Neo4j® Aura™, and Neo4j® AuraDB™ are registered trademarks or a trademark of Neo4j, Inc. All other marks are owned by their respective companies.

Stripe

WHO WE ARE ABOUT STRIPE Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. ABOUT THE TEAM The Core Infrastructure team at Stripe is entrusted with developing and maintaining the infrastructure utilized by all product teams to create services that underpin all Stripe business operations. This includes defining and executing a vision that ensures industry-leading scale and availability, and actively balancing these concerns with efficiency, latency, and organizational health. We are committed to advancing new distributed services and scaling existing technologies across the industry, in close collaboration with various teams to support their current and future demands, and various external partners in the open source community. Our infrastructure supports businesses worldwide by processing payments, managing marketplaces, assisting entrepreneurs in launching internet businesses, and more. The Infrastructure organization comprises teams responsible for operating system components, databases, caching, high availability, disaster recovery, cloud infrastructure, Linux servers, container orchestration, mesh networking, service discovery, change management, and network edge infrastructure. WHAT YOU'LL DO As a Software Engineer on the Infrastructure team, you will be part of a team that is in charge of building the core infrastructure used by product teams which support our business. Examples include control plane services responsible for managing our primary database and cache infrastructure as well as building automation around managing cloud components for compute, cache, and networking. You will also build a great customer experience for internal Stripe teams that build on your software to power all of our products, globally and at scale. RESPONSIBILITIES * Design, build, and maintain distributed cloud infrastructure and platform services * Work on scaling, automation, reliability, and observability of infrastructure services * Operate your service, debug issues, and support customers * Participate in roadmap planning and prioritization WHO YOU ARE We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement. MINIMUM REQUIREMENTS * 5+ years of professional experience in a software development role * Experience building, deploying, and managing infrastructure on a major cloud provider * A strong engineering background in building platform services and/or distributed systems at scale, with a solid grasp of underlying operating system primitives * Experience developing, maintaining, and debugging distributed systems, including diagnosing low-level resource constraints * Experience with operational excellence and modern observability practices, including distributed tracing, structured logging, and system-level metrics PREFERRED QUALIFICATIONS * Experience with popular cloud technologies — AWS, Azure, GCP, or Oracle Cloud * Experience with Go or other systems languages (e.g., Rust, C/C++) * Experience with Linux OS internals, performance optimization, and kernel-level troubleshooting * Experience working with Kubernetes clusters and low-level container mechanics * Experience in networking and traffic systems at scale * Experience handling critical incidents for production systems

Apotea Sverige AB

Tech Innovation at Apotea Apotea is Sweden’s largest online pharmacy. We are rebuilding our core platform on a modern cloud-native architecture and investing in our technology stack. In Tech, our vision is to move toward AI-first, automated and data-driven systems — not by adding AI on top of legacy workflows, but by redesigning how software is built and operated. We focus on scalable, observable systems owned by engineers end-to-end. We are now looking for Senior Full-Stack Software Engineers who want ownership, impact and engineering challenges. The Role As a Senior Full-Stack Software Engineer, you will design, build and operate distributed backend systems and modern frontend applications that power Apotea’s core products and emerging AI-driven experiences. You will own the full software lifecycle: architecture, implementation, deployment, monitoring and improvement — from database design and backend services in Go to frontend experiences for teams and customers. You will work with data engineers, ML engineers, product managers and business stakeholders to turn problems into production systems, including agentic AI applications where software agents interact with data, services and workflows. Key Responsibilities Full-Stack System Design & Implementation: Design and build backend services in Go for distributed, cloud-native applications. Build frontend applications that connect users to data, workflows and AI-powered capabilities. Build APIs and event-driven components across e-commerce, logistics, data and AI platforms. Design systems with scalability, resilience and observability in mind. Database Design & Data Ownership: Design application-level data models and database schemas. Make informed trade-offs between storage approaches. Understand query patterns and performance implications. Integrate operational systems with analytics and ML pipelines. Agentic AI Applications: Build production-grade agentic AI applications that integrate LLMs with real systems and workflows. Design services that enable AI agents to act safely with business data. Collaborate with ML and data engineers to operationalize AI in real products — not demos. Help define guardrails and patterns for reliable AI-driven systems. Engineering Excellence: Write clean, maintainable, production-quality code across backend and frontend. Participate in code reviews and architectural discussions. Build automated tests and CI/CD pipelines. Take responsibility for production reliability and incident resolution. Improve engineering standards, tooling and AI-assisted coding workflows. We are looking for someone with: Strong experience as a Senior Full-Stack Software Engineer building production systems. Proven experience with Go (Golang) in backend environments. Solid understanding of distributed systems and modern architectures. Experience building frontend applications. Experience with database design and application data modeling. Strong fundamentals: testing, versioning, CI/CD, documentation and code quality. Ownership mindset and ability to balance speed and quality. Excellent communication skills and collaborative attitude. Nice to Have Experience with A/B testing or experimentation frameworks. Familiarity with event-driven architectures and streaming systems. Experience with AWS and cloud-native architectures. Experience building AI-powered or agentic applications. Exposure to high-scale e-commerce, logistics or data-heavy environments. Knowledge of Infrastructure as Code, such as Terraform, CDK or CloudFormation. Why Join Apotea? A stable, future-focused company with a meaningful mission to improve healthcare accessibility. Work on AI, ML and automation projects that impact millions of customers. Work with modern cloud-native, automated and event-driven systems. Join a flat, agile organization with minimal bureaucracy. Grow through training, mentorship and industry conferences. Collaborate in a transparent, cross-functional environment. Own projects from concept to deployment. About Apotea Apotea.se is Sweden’s largest online pharmacy. We simplify everyday life for customers with fast deliveries, a broad product range and expert advice. In 2024, Apotea reached a turnover of SEK 6.5 billion and employs about 1,000 people across Stockholm, Lidingö and Morgongåva. Apotea is an inclusive employer that values diversity. We welcome all applicants and strive to create a work environment where everyone can thrive and grow. Recruitment Process Apply Interview: Screening Interview: Technical Capabilities Interview: Culture Fit Background Check: As a pharmacy, we always conduct a background check. Offer Presented Application Send in your application today. For more information, visit our career page or contact us at jobb@apotea.se. We do not accept applications via email. Join Us and Make a Difference - We hope you want to be part of our team! Interviews are ongoing, and the position may be filled immediately. Start date by agreement. Location: Sveavägen 168, Stockholm, Sweden (On-site) Open Positions: 4 Welcome to Apotea – where technology meets health and creates magic!