Rust Systems Developer (SDK, Mobile & Routers)

ExitLag; São Paulo; On-site; BRL 167,400 - 279,000; Full time

Benefits offered by this job

30 days paid vacation

Annual bonus (13th month)

Performance bonus

Stock options

Flash Card allowance

Birthday day off

Bradesco health plan

Wellness partnerships

Educational subsidy

Unlimited ExitLag license

Job summary

Cooperflora is seeking a Rust Systems Developer to enhance its libexitlag-rs technology for optimizing connections between players and game servers. You will be responsible for developing integrations across multiple platforms including SDKs and mobile, while ensuring performance and reliability. Ideal candidates should have 3+ years of experience in Rust, with strong networking and debugging skills. The position offers various benefits including a health plan, performance bonuses, and generous vacation time.

Qualifications

• 3+ years of experience with Rust in production.
• Strong skills in systems and network programming.
• Experience with FFI (JNI, C bindings, etc.).

Responsibilities

• Work on the core of our network pipeline.
• Develop integrations for multiple platforms.
• Contribute to architecture improvements.

Skills

Experience with Rust in production

Systems and network programming

FFI (JNI, C bindings, or similar)

Cross-compilation

Strong debugging skills

Tools

Tokio

TCP/UDP Networking

Protobuf

SQLite

CI/CD

Job description

Job Purpose

ExitLag is looking for a Rust Systems Developer to work at the heart of our technology: libexitlag-rs, the library responsible for optimizing the connection between players and game servers.

You’ll be working with a single codebase running on multiple platforms, SDK (Windows/macOS), mobile (Android/iOS), and routers (OpenWrt).

If you enjoy asynchronous Rust, networking, and high-performance systems, this position is for you.

What you’ll be doing

• Work on the core of our network pipeline (proxy, routing, and traffic optimization)
• Develop integrations for SDK (Windows/macOS), Mobile (Android and iOS), Routers (OpenWrt / ARM / MIPS)
• Work on performance, latency, and reliability
• Work on cross-platform projects (from the core to integrations via FFI)
• Contribute to continuous improvements in architecture and builds

Main Stack

• Rust (async with Tokio)
• Networking (TCP/UDP, TUN/TAP, SOCKS, Netfilter, WFP)
• FFI (JNI, C API, bindgen)
• Protobuf, SQLite
• CI/CD and cross-compilation

Essential requirements

• Experience with Rust in production (3+ years)
• Experience with systems and network programming
• Experience with FFI (JNI, C bindings, or similar)
• Experience with cross-compilationStrong debugging skills (multi-platform / network)

Preferred

• Experience with Android, iOS, Windows, or OpenWrt
• Knowledge of VPNs, proxies, or gaming networking
• System performance and optimization
• English and/or Portuguese for technical communication

Benefits

• Paid vacation: 30 days after 12 months of employment, with the option to sell up to 10 days.
• Annual bonus (13th month): equivalent to 1 additional month’s salary, paid proportionally based on length of service.
• Performance bonus (In-Company Goal): potential for up to 5x additional monthly salaries per year, based on goal achievement.
• Stock Options: eligibility after 6 months of employment, 4‑year vesting period.
• Flash Card: R$ 1,200.00/month with flexible use (food, home office, bills, or as preferred)
• Birthday Day Off: a day off to celebrate however you like.
• Bradesco Health Plan: 100% covered by the company for the primary beneficiary (initially).
• Wellness partnerships: access to Zenklub (emotional health) and TotalPass (gyms and physical activities).
• Educational subsidy: up to 50% coverage for courses and specialized training (after 6 months with the company).
• Unlimited ExitLag license: full access to our premium product.