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Backend Developer (Rust)

Remote, Berlin +21·Full-time·Added 19 days ago

OnHires

23 open roles

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Overview

Job details

Full-time hours
Per the ad.
Fully remote
Only from certain places, per the ad: “Elsewhere in Europe / LATAM: fully remote, no office requirement.”

Requirements

Have the right to work in Spain
OnHires doesn't mention sponsorship, but this role may fit the Digital nomad visa.
Have 7+ years of experience
Mid-level role.

Requirements

What we're looking for

7+ years of backend development experience.
3+ years of professional Rust experience.
Strong, practical grasp of distributed systems and fault-tolerant software architecture.
Familiarity with at least some of: graph theory, type theory, parsers and compilers, and related CS fundamentals. We don't expect mastery of all of these - most strong candidates bring deep expertise in 3-4 out of 5 core areas, with distributed systems being the one we weight most heavily.
Real-world DevOps experience.

Nice to have

A background in C/C++ before moving to Rust.
Experience with key-value stores or distributed databases - FoundationDB or TiKV are a big plus.
Experience with frontend web development.
Experience with existing low-/no-code workflow tools (n8n, Prefect, AWS Step Functions).
Understanding of WASM runtimes.
Previous experience with logistics or process management systems.

The role

Rust Engineer - Distributed Execution Engine

You'll join a small engineering team building the client's sourcing platform. Your focus will be their flowgraph - a horizontally scalable, step-based execution engine, similar in spirit to n8n or Unreal Engine's Blueprints, but built from the ground up in Rust with strong typing and production workloads in mind. It drives their order processing and ETL pipelines.

This isn't a typical backend role. Rather than wiring together managed queues and off-the-shelf orchestration tools, the team builds its own coordination and fault-tolerance mechanisms from scratch - because the workloads don't fit neatly into existing solutions. If you enjoy thinking about graph theory, type systems, parsers and compilers, WASM runtimes, or distributed systems architecture as part of your everyday work - not just as a personal interest - you'll feel at home here.

What you'll do

Research, design, and build on the client's bespoke distributed graph execution engine, written in Rust.
Design and implement graph executor node implementations to power third-party integrations with partner and supplier systems.
Build and maintain infrastructure for the distributed execution engine - deployment pipelines, observability, and site reliability.
Design and implement coordination and fault-tolerance mechanisms from scratch (not by wrapping existing message queues) - handling partial failures, node coordination, and recovery within the engine itself.
Develop and maintain logistics and ETL workflows within this ecosystem, tied directly to the core business.

How you'll work

Berlin / Wildau area: hybrid, with 1 day per week in the office.
Elsewhere in Europe / LATAM: fully remote, no office requirement.
Employment: official employment in Germany, or B2B contract elsewhere in Europe.
Full-time, ~40 hours/week, with meaningful overlap with CEST hours.

About OnHires

OnHires is a London-based recruitment and talent acquisition agency that specializes in connecting technology and business professionals with companies across Europe, the Middle East, and Asia. The company operates as a staffing and headhunting firm, offering services that range from executive search to full-cycle recruitment for roles in engineering, marketing, finance, and legal. With a focus on remote and hybrid placements, OnHires serves a diverse client base, from early-stage startups to established enterprises, and manages a significant volume of open positions across multiple sectors.

OnHires has a notable presence in Spain, with 28 currently open roles that are available to candidates based in the country, many of which are remote-friendly. The company's work culture is centered on flexibility and international collaboration, making it an attractive option for professionals seeking remote work opportunities with global teams. For international hires, OnHires offers the chance to work with a variety of clients and industries, providing a dynamic environment that values adaptability and cross-cultural communication.

Employees: 50
Headquarters: London, UK

Good to know if you are moving

OnHires is a remote-first recruitment agency, so most roles are remote-friendly, which is ideal for international professionals based in Spain.
The company places candidates in a wide range of industries, from tech and engineering to marketing and legal, offering diverse career opportunities.
OnHires operates across Europe, the Middle East, and Asia, providing exposure to international clients and teams.
As a staffing agency, OnHires itself does not offer direct employment; instead, it connects candidates with client companies, which may affect benefits and employment terms.

In their own words

About the company & team

Our client is a B2B sourcing platform serving the automotive dealership industry. They're a small, fast-moving engineering team building core infrastructure from the ground up rather than assembling off-the-shelf tools - the kind of environment where a single engineer's technical decisions shape the product for years.

All open roles at OnHires