Backend Engineer

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Together AI is hiring a Senior Backend/Distributed Systems Engineer to power the Together AI Sandbox, in a hybrid Amsterdam role with 40 hours a week. You should have 5+ years building high‑performance, well‑tested production code and proven experience designing large scale, fault tolerant distributed systems, plus expert programming in Golang, Java, Rust, or C/C++, and strong PostgreSQL and Redis/ClickHouse skills. Responsibilities include designing core backend components, researching AI workload architectures, conducting design and code reviews, creating tests and developer docs, and handling on‑call incidents. To apply, tailor your resume to show measurable scale and resilience, share code or project links, demonstrate collaboration with product teams, and confirm NL work eligibility without sponsorship.

About the role

Together AI/Codesandbox is looking for a Senior Backend/Distributed Systems engineer to help us build and maintain the codebase that powers the Together AI Sandbox service. This is a role for engineers that are familiar with standard backend architecture, database design, and high-performance backend services. Our API platform is under constant load and scrutiny, so a key part of the role is experience and commitment to writing easily understood and well-tested code. You will be working closely with the product team to understand and document the functional needs of their product requirements, developing new code to solve new problems, as well as maintaining existing code to squash bugs.

• Location: Hybrid in Amsterdam, and must have be based in the Netherlands or have the relevant visa to be based in the Netherlands without sponsorship.
• Full-time: This means 40 flexible hours, Monday through Friday.

Responsibilities

• Design core, backend software components
• Perform architecture and research work for AI workloads
• Interface with other teams to incorporate their innovations
• Analyze and improve efficiency, scalability, and stability of various system resources
• Conduct design and code reviews
• Create services, tools and developer documentation
• Create testing frameworks for robustness and fault-tolerance
• Participate in an on-call rotation to respond to critical incidents as needed

Requirements

• 5+ years experience writing high-performance, well-tested, production quality code
• Bachelor's or Master's degree in Computer Science, Computer Engineering, relevant technical field, or equivalent practical experience
• Demonstrated experience in building large scale, fault tolerant, distributed systems like storage, search, and computation
• Expert level programmer in one or more of Golang, Java, Rust, or C/C++
• Demonstrated experience with relational (e.g., PostgreSQL) and non-relational (e.g., ClickHouse, Redis) databases
• Experience designing, analyzing and improving efficiency, scalability, and stability of various system resources
• Excellent understanding of low level operating systems concepts including multi-threading, memory management, networking and storage, performance and scale
• Experience with Kubernetes/Nomad and containers is a plus
• Experience with virtual machines, microVMs, or sandboxing technologies (e.g., gVisor, Firecracker, QEMU) is a plus
• Experience with Ceph is a plus
• Experience with Elixir is a plus

About Together AI

Together AI is a research-driven artificial intelligence company. We believe open and transparent AI systems will drive innovation and create the best outcomes for society, and together we are on a mission to significantly lower the cost of modern AI systems by co-designing software, hardware, algorithms, and models. We have contributed to leading open-source research, models, and datasets to advance the frontier of AI, and our team has been behind technological advancement such as FlashAttention, Hyena, FlexGen, and RedPajama. We invite you to join a passionate group of researchers and engineers in our journey in building the next generation AI infrastructure.

Compensation

We offer competitive compensation, startup equity, and other competitive benefits. Our salary ranges are determined by location, level and role. Individual compensation will be determined by experience, skills, and job-related knowledge.

Equal Opportunity

Together AI is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more.