A significant portion of backend logic is shared across services, and this role will help define, maintain, and scale that foundation.

You will own and improve internal schema and code generation tooling that ensures consistency and correctness across services.

You will work on and extend our custom job scheduler, improving reliability, observability, and execution guarantees for distributed workloads.

You will contribute to safely execute large-scale concurrent and distributed operations.

You will play a key role in defining and maintaining API standards across teams, ensuring performance, backward compatibility, and clear evolution strategies.

You will collaborate closely with Product and various Engineering teams to design systems that are reliable, scalable, and maintainable over time.

The Core Systems team is responsible for the foundational backend infrastructure that powers Weights & Biases within CoreWeave.

Much of the platform's critical logic is shared across services, and this role sits at the center of that foundation.

You will work on the systems that other engineers build upon , from execution frameworks and schedulers to schema tooling and API standards.

This is a high-leverage role focused on durability, scalability, and long-term maintainability.

The systems you design and evolve will directly impact reliability, developer velocity, and the ability of the platform to scale with growing workloads.

You'll collaborate across teams to ensure that shared backend abstractions remain clean, performant, and consistent as we continue to expand our adoption of technologies like GraphQL and gRPC.

If you enjoy owning deep technical infrastructure, shaping engineering standards, and building systems that other engineers depend on every day, this role offers meaningful scope and impact.

You will be surrounded by some of the best talent in the industry, who will want to learn from you, too.

Come join us!

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At Yuno, we are building the payment infrastructure that enables all companies to participate in the global market.

About The Role

We are looking for an experienced Engineering Leader to join our team. As a Technical Leader, you will lead a core part of our payments ecosystem, building and evolving solutions that serve enterprise clients using our payments platform.

Responsibilities

• Lead the technical evolution of Yuno's merchant experience, focused on Core platform, APIs, and payment integrations.
• Own system and integration architecture connecting backend services and payment flows.
• Contribute hands-on to development, architecture decisions, and code reviews.
• Ensure scalable, maintainable, and well-documented solutions for enterprise merchants.
• Collaborate with Product, Backend, and Payments teams to align platform and merchant needs.
• Drive engineering best practices in API design, testing, and performance.
• Support and mentor engineers through technical guidance and architectural direction.

What We Offer at Yuno

• Competitive Compensation.
• Remote Work – You can work from everywhere!
• Home Office Bonus – A one-time allowance to help you create your ideal home office.
• Work Equipment.
• Stock Options.
• Health Plan wherever you are.
• Flexible Days Off.
• Language, Professional, and Personal Growth courses.

Skills You Need

• Advanced English; conversational Spanish is a plus.
• Experience in payments companies or payments-related teams.
• Deep experience in payments infrastructure, including network tokens, routing, and transaction optimization.
• Staff-level technical leadership experience, with the ability to influence architecture, mentor engineers, and represent technical decisions to both technical and non-technical audiences.
• Strong backend engineering experience, with focus on implementation and system design.
• Proven experience building and maintaining platforms, APIs, and integrations.
• Solid understanding of scalable architectures and distributed systems.
• Hands-on experience with Java, Golang or Kotlin.
• Experience contributing to technical decisions and code reviews.
• Hands-on experience leveraging AI tools and systems (e.g. Claude, AI agents, or LLM-powered workflows) to improve developer productivity or platform capabilities.

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What you'll do

• Design, build, and operate mission-critical APIs in Python, Go, or Rust optimized for low latency, high throughput, and strong consistency.
• Lead major technical initiatives, from new platform components to multi-team system redesigns.
• Improve system reliability and security by implementing rate limiting, authentication, observability (metrics, tracing, logging), and automated testing.
• Collaborate across teams to determine when to extend existing systems versus build new, specialized services.
• Translate customer needs into scalable platform capabilities and generalized API features.
• Uphold engineering excellence through design reviews, code quality, and internal documentation.

What you need

• 5+ years of backend engineering experience with Python, Go, or Rust.
• Strong understanding of high-traffic API design: versioning, schema evolution, idempotency, auth patterns, and performance tuning.
• Hands-on experience running AWS services, plus fluency with Kubernetes, CI/CD, and modern DevOps practices.
• Experience with LLM or natural-language APIs (latency tuning, streaming, model orchestration) is a strong plus.
• Strong customer empathy and product sense, ensuring the APIs you build are ergonomic, well-documented, and easy to adopt.

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What you'll do

• Design and develop backend microservices in Rust for scalable and resilient operation
• Analyze and optimize data flow from client-side to backend services and data storage

What you need

• 5+ years of backend engineering experience, ideally including technical project ownership
• Expert proficiency in Rust and related backend libraries

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