System Architect (GO/Rust)

Workato; Amsterdam; On-site; EUR 90,000 - 130,000; Full time

Job summary

Workato is seeking a talented systems/backend engineer to own core language and runtime features for the Expression Language, Data Mapper, and Decision Engine. You will extend the Rust core and embed it inside Ruby and Go services via FFI bindings.

You’ll help expand the Decision Engine to support formulas, contribute to WASM sandboxing, and collaborate with Product and AI teams to shape the platform's next generation.

Qualifications

• Deep hands-on Rust experience at a systems/backend level.
• Production competence in Go.
• Experience embedding Rust as a library inside other runtimes (e.g., Rust-in-Ruby, Rust-in-Go).
• Strong algorithms and data-structures fundamentals.
• Ability to work without a fixed process in a deadline-driven environment.
• Experience with AI-assisted workflows and large-scale systems.
• Excellent technical writing and cross-team communication.

Responsibilities

• Design and build core language and runtime features across Expression Language, Data Mapper, and Decision Engine.
• Own and extend the Rust core, embedding it as a native component inside Ruby and Go services via FFI bindings.
• Help expand Decision Engine from static rules to support formulas.
• Contribute to WASM sandboxing so components run safely and isolated.
• Partner with Product and AI teams to define surface area and expose component capabilities.

Skills

Rust

Go

Rust-in-Ruby

Rust-in-Go

Algorithms & data structures

AI-assisted workflows

Systems engineering

Technical writing

Cross-team collaboration

Mentorship

Tools

Wasmtime

Wasmer

WASM sandboxing

Job description

About Workato

Workato delivers enterprise infrastructure for the agentic era, redefining iPaaS and helping enterprises unify data, applications, processes, and AI into a single, governed platform. A leader in Enterprise MCP and trusted by 50% of the Fortune 500, Workato’s cloud-native architecture connects every application, data source, and process to power real-time orchestration at scale. With enterprise-grade security and continuous innovation at its core, Workato provides the trusted foundation for organizations to automate with confidence and operationalize AI across the business. To learn more, visit www.workato.com

Why join us

Ultimately, Workato believes in fostering a flexible, trust-oriented culture that empowers everyone to take full ownership of their roles. We are driven by innovation and looking for team players who want to actively build our company. But, we also believe in balancing productivity with self-care. That’s why we offer all of our employees a vibrant and dynamic work environment along with a multitude of benefits they can enjoy inside and outside of their work lives.

Also, Feel Free To Check Out Why

• Business Insider named us an "enterprise startup to bet your career on"
• Forbes’ Cloud 100 recognized us as one of the top 100 private cloud companies in the world
• Deloitte Tech Fast 500 ranked us as the 17th fastest growing tech company in the Bay Area, and 96th in North America
• Quartz ranked us the #1 best company for remote workers

Responsibilities

Engine team owns three components used company-wide: Workato Expression Language (our original mini-language for data transformation in recipes), Data Mapper (a new, UI-oriented mapping and format-transformation component), and Decision Engine (a rules component, currently static-only, being expanded to support formulas). The stack is a Rust core with WASM sandboxing per component, with bindings into Ruby and GO.

In This Role, You Will Also Be Responsible To

• Design and build core language and runtime features across the Expression Language, Data Mapper, and Decision Engine.
• Own and extend the Rust core, embedding it as a native component inside Ruby and Go services via FFI bindings.
• Help expand Decision Engine from static rules to support formulas.
• Contribute to WASM sandboxing so each component runs safely isolated from the others.
• Partner closely with Product and with the AI team on what these components need to expose.

Qualifications / Experience / Technical Skills

• Deep, hands-on Rust experience at a systems/backend level.
• Working competence in Go - real production ability, though not necessarily your primary language.
• Proven experience embedding Rust as a library or native extension inside another language's runtime (e.g. Rust-in-Ruby, Rust-in-Go).
• Strong algorithms and data-structures fundamentals (sorting, trees, data processing).
• Comfort operating without a fixed process methodology, in a deadline-driven, cross-team environment.
• Experience with AI-assisted workflows, particularly in system analysis and hunting for inconsistencies and corner cases.
• Scale: Experience with systems handling millions of requests/events per day.
• Exceptional technical writing and communication abilities for diverse audiences.
• Experience planning phased implementations and leading complex cross-team projects.
• Proven track record with feature flags, gradual rollouts, and zero-downtime deployments.
• Ability to facilitate architectural decision-making and create technical roadmaps.
• Mentorship mindset and cost analysis capabilities.

Nice to Have

• Compiler engineering experience - a strong plus.
• WASM/sandboxing experience (Wasmtime, Wasmer, WASI, or similar).
• Familiarity with data-format standards/RFCs (JSON, Unicode).
• Awareness of project-cycle practices (Scrum/waterfall) and testing discipline.
• Community: open source contributions, conference speaking, technical writing.