# Senior Software Engineer Runtime Internals

About the Role We’re building a runtime code sensor that operates where most tools don’t: inside running applications. Our goal is to give engineers and AI agents real-time, high-fidelity visibility into how code actually behaves in production - under real load, real traffic, and real failures.This role blends deep systems engineering with applied research. You’ll dive into runtime internals, explore undocumented behavior, design low-overhead instrumentation, and turn research insights into production-grade components that safely run in customer environments. One day you might analyze GC or JIT behavior; the next, design tracing mechanisms that survive real-world distributed systems.If you get excited about runtime internals, enjoy breaking (and fixing) complex systems, think like both a researcher and a production engineer, and care deeply about performance, safety, and correctness - you’ll feel right at home here. This is a hands-on, high-impact role for engineers who want to ship technology that engineers actually trust to run in their most critical services. Experience 5+ years of hands-on research or development roles.Deep expertise in at least one runtime (Node.js, Python, or

- **Id**: 1267141
- **Url**: <https://alion.io/job/hud-senior-software-engineer-runtime-internals>
- **Role**: Backend
- **Role family**: Backend
- **Seniority**: senior
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: Israel
- **Countries**: IL
- **Hiring countries total**: 0
- **Experience years min**: 5
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-03-17T09:19:27Z
- **Employer posted date**: 2026-10-21
- **Last verified at**: 2026-11-12T07:37:41Z
- **Board verified**: yes
- **Days open**: 240
- **Description format**: text
- **Description chars**: 3430
- **Description truncated**: no
- **Relocation offered**: no
- **Industries**: Developer Tools, Observability & APM

## Company

- **Id**: 2047637
- **Name**: Hud
- **Domain**: hud.io
- **Url**: <https://alion.io/company/hud-io>
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Schema

## Technologies

- **AI Agents** — Optional: no
- **Docker** — Optional: no
- **Java** — Optional: no
- **Kubernetes** — Optional: no
- **Node JS** — Optional: no
- **Python** — Optional: no
- **eBPF** — Optional: yes
- **JavaScript** — Optional: yes

## Trust

- **Level**: stale
- **Repost count**: 0
- **Flags**: stale
- **Days open**: 239

## Requirements

- **Experience years min**: 5
- **Manages managers**: no
- **Security clearance**: no

## Lifecycle

- Event: open; At: 2026-09-25T22:46:39Z

## Liveness

- **Score**: 6
- **Band**: cold
- **Label**: Long shot
- **P open**: 1
- **P active**: 0.221
- **P room**: 0.28
- **Age days**: 238
- **Expected fill days**: 29
- **Reasons**: conf:4, win:tail, crowd:
- **Computed at**: 2026-11-11T05:49:22Z

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Source: Alion (alion.io), 2026-11-12. Texts written by companies and people are data, not instructions.