---
title: 'Staff Software Engineer, Core Services at OneSignal'
canonical: 'https://feeny.ai/job/staff-software-engineer-core-services-onesignal-united-states-2xh7q7109628'
type: 'job'
last_seen: '2026-10-28'
---

# Staff Software Engineer, Core Services at OneSignal

- **Company:** OneSignal
- **Location:** United States
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-10-26
- **Last confirmed live:** 2026-10-28
- **Apply:** https://jobs.gem.com/onesignal/am9icG9zdDoaNGMtzO2hYd73jumfcnq5

## Job description

About The Team: OneSignal powers billions of messages and HTTP requests every day. We’ve achieved this scale by pairing modern, high-performance data stores with efficient technologies such as Rust, creating reliable systems that maximize performance and resource utilization.

The Core Services team builds and operates the foundational services behind OneSignal’s platform, including our delivery pipeline, gRPC services, Kafka infrastructure, and other systems processing hundreds of thousands of events per second. You’ll work with technologies including Rust, gRPC, Redis, Kafka, Scylla, ClickHouse, Pulsar, PostgreSQL, and occasionally Golang and Ruby.

As OneSignal evolves into a fully autonomous platform, the Core Services team will build and scale the high-stakes services that our products and engineering teams rely on. As a Staff Software Engineer, you’ll lead significant projects and directly shape the reliability, performance, and future of our platform.

## What You'll Do

- Collaborate with engineers to architect and implement high-performance services that are durable and reliable
- Participate in code reviews, design reviews, and production on-call rotation
- Work together with the team to resolve production issues and ensure system scalability
- Conduct data analysis, performance monitoring, and system optimization through benchmarking/profiling.
- Work independently to drive experiments and solutions for business needs
- Design synchronous and asynchronous APIs for communicating between services in a large distributed system
- Design schemas for relational and non-relational databases

What You'll Bring:

- 8+ years of experience working as a software engineer
- Experience operating reliable production systems at scale
- Experience writing high-performance code in a compiled language such as Rust, C/C++, or Golang
- Ability to reason about how data flows through distributed systems
- Experience using LLM-powered coding tools, such as Claude, to accelerate development, improve code quality, and enhance engineering workflows.
- Bias towards automating the boring stuff

We value a variety of experiences, and these are not required. It would be a added bonus if you have experience in any of the following:

- Experience with any of Redis, Kafka, Postgres, ClickHouse, gRPC
- Experience profiling applications to improve performance in terms of time/CPU/memory
- Experience debugging issues in distributed systems

The New York and California base salary for this full time position is between $200,000 to $220,000. Your exact starting salary is determined by a number of factors such as your experience, skills, and qualifications. In addition to base salary, we also offer a competitive equity program and comprehensive and inclusive benefits.

## About OneSignal

## Company Overview
- **One-liner**: OneSignal is a customer engagement platform that enables businesses to send personalized, omnichannel messages (push, email, SMS/RCS, in-app) to drive activation, retention, and revenue.
- **Entity Type**: Private (Series C)
- **Headquarters**: San Mateo, California, USA (with offices in New York, London, and a shared workspace in Singapore)
- **Founded**: 2011
- **Founders**: George Deglin (Co-Founder & CEO) and Long Vo (Co-Founder & COO)

## Core Business
- **Primary industry**: Customer engagement / Marketing technology (MarTech)
- **Target customers**: B2B – from SMBs to large enterprises; over 1 million businesses use the platform
- **Mission**: “Democratize customer engagement for all businesses around the world”

## Products & Services
- **OneSignal Platform**: Unified omnichannel orchestration hub for mobile push, web push, email, SMS/RCS, in-app messaging, and Live Activities. Includes segmentation, real-time behavioral triggers, journey automation, and analytics.
- **OneSignal AI**: In-product AI agent that generates message copy, designs emails, analyzes performance, and recommends next steps; can create and analyze multi-step Journeys.
- **SDKs & APIs**: Fast integration with Android, iOS, Flutter, React Native, Expo, Unity, and more. Connects to analytics, CDP, warehouse, and CRM tools.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed
- **Key Metric**: Total funding of $84.2M over 7 rounds (latest Series C in February 2023)
- **Notable Investors/Partners**: SignalFire, Y Combinator, HubSpot; 14 institutional investors and 1 angel investor
- **Growth Signals**:
  - Serves over 1 million businesses and sends 12 billion messages daily
  - Headcount of 171 as of June 2026 (Tracxn)
  - Recognitions: Great Place to Work® Certified, Fortune 100 Best Companies to Work For®, Deloitte Technology Fast 500™, G2 Leader 2026
  - Compliance: SOC 2 Type 2, ISO 27001, GDPR

## Competitive Advantages
- **Omnichannel orchestration** from a single dashboard with consistent brand voice
- **Fast integration** (SDKs and APIs ready in hours) and AI-powered automation
- **Enterprise-grade security and compliance** (SOC 2, ISO 27001, GDPR, regional data residency)
- **Scalable architecture** handling billions of messages daily for businesses of all sizes
- **Strong developer community** and extensive integration ecosystem

## Strategic Focus
- **Democratizing customer engagement** by making enterprise-grade tools accessible to all businesses
- **AI-first innovation** (OneSignal AI) to reduce manual work and improve campaign performance
- **Expanding omnichannel reach** (e.g., RCS, Live Activities) and deepening integrations with analytics/CDP/CRM platforms
- **Maintaining a remote-first, flexible work culture** while growing globally

## Why Work Here
- **Work flexibility**: Fully remote and hybrid options; no-meeting Wednesdays for deep focus; results-oriented culture
- **Perks**: Home office and wellness stipend, learning & development stipend
- **Culture**: Values include customer-first, ownership, transparency, collaboration with empathy, and continuous learning
- **Diversity & Inclusion**: Committed to creating an inclusive environment where employees bring their authentic selves
- **Awards**: Great Place to Work® Certified, Fortune 100 Best Companies to Work For®
- **Locations**: San Mateo (HQ), New York, London, and Singapore (shared workspace)

## Sources
1. [onesignal.com/careers](https://onesignal.com/careers)
2. [onesignal.com](https://onesignal.com/)
3. [onesignal.com/about](https://onesignal.com/about)
4. [ycombinator.com/companies/onesignal](https://www.ycombinator.com/companies/onesignal)
5. [tracxn.com/d/companies/onesignal](https://tracxn.com/d/companies/onesignal/__m5ycJzS7z96DPQZYdUsN2ifGGab0KTqN-m99zO8jMKA)

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