--- title: 'Sr. Software Engineer, Fullstack (UK) at Firstup' canonical: 'https://feeny.ai/job/sr-software-engineer-fullstack-uk-firstup-london-b39caskg8acy' type: 'job' last_seen: '2026-11-05' --- # Sr. Software Engineer, Fullstack (UK) at Firstup - **Company:** Firstup - **Location:** London, United Kingdom - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2026-10-30 - **Last confirmed live:** 2026-11-05 - **Apply:** https://jobs.lever.co/firstup/9f32d630-05b5-4828-82d0-d1448582479a ## Job description ## Who We Are At Firstup, our mission is to improve the employee experience at every moment that matters, large and small. As the communication pipeline for the world's workforce, we now serve 40 of the Fortune 100 companies, reaching and connecting more than 17 million employees daily. Our employees are experts in the employee experience, workforce communications and technology. Joining Firstup means joining a movement to make work better for every worker. As the world’s first intelligent communication platform, Firstup meaningfully engages employees at every moment from hire to retire, and delivers engagement insights to help companies support, promote and retain their talent. Our movement has taken root and is evident in our world-class customer base. Now we need your help. Ready to make a difference in the world? Job Summary The Software Engineer will join the team responsible for Firstup's public APIs, Agentic tools, third-party integrations with enterprise systems such as HRIS platforms, and shared platform services. You will deliver innovative, scalable solutions while constantly improving our approach to architecture, scale, availability, and fault-tolerance. You are an active user of Generative AI tools and coding agents, applying them daily to accelerate delivery and improve code quality. ## Responsibilities - Core Engineering & Ownership: Build and own scalable SaaS applications end-to-end — frontend, backend, and data layers. Write production-grade code that is reliable, readable, efficient, and testable. Raise the bar through thoughtful code reviews and comprehensive documentation. - System Architecture: Design future-ready architectures and proactively close gaps before they become problems. - Performance & Reliability: Drive system availability and performance — investigate, analyze, and resolve reliability issues across the stack. Recognize opportunities and advocate for better performance and efficiency of software, systems, and processes across teams. - Shift Left Testing & Quality: You champion a rigorous 'shift-left' quality culture, embedding comprehensive testing—unit, integration, and contract—early and continuously in the development lifecycle, not as an afterthought. - AI Integration: Leverage and advocate for AI-assisted tools (e.g., GitHub Copilot, Claude) to accelerate development while maintaining rigorous engineering judgment and accountability for code correctness. - Leadership: Drive team-wide best practices, conduct quality code reviews, and mentor engineers to elevate overall engineering quality. - Collaboration (Product & Design): Partner with Product and Design to translate requirements into intuitive UI, making informed technical trade-offs in the face of ambiguity. - Collaboration (Engineering Standards): Champion engineering best practices across teams and collaborate on solving complex, high-impact problems. ## Minimum Qualifications - Bachelor's degree in Computer Science or related field, or equivalent experience. - 8+ years building reliable, performant applications and microservices in production environments. Proven full stack fluency - you're comfortable across frontend, backend, and the database layer. - A polyglot mindset — you evolve with the tech. Familiarity with Ruby on Rails, TypeScript, [Node.js](http://node.js), Go, or React.js is a strong plus. - Proven full-stack experience across frontend (React.js), backend, and database layers. - Contribute to production health, including on-call rotations and incident response, in a "you build it, you run it" environment. - Technical depth in at least one engineering domain: distributed systems, multi-tenant SaaS, application databases, networking, security, serverless, event streaming, or similar. - A genuine drive to build beautiful, intuitive products with the customer always in focus. Innate curiosity — you love learning and have a desire to teach and lift others. Strong communication skills and openness to collaborative idea-sharing across teams. Preferred Qualifications: - Core Stack Experience: Familiarity with Ruby (including Ruby on Rails), TypeScript, Node.js, Go, or React.js is a strong plus. Why Firstup? Because you care - about people, the work you do, and the connections you make. Work is such a large part of life; it only makes sense to make it awesome. If you want to engage brilliant minds in a high-growth and inclusive environment where ideas are rewarded regardless of who they come from, join us. This is a rapidly changing space so if you thrive on ambiguity, are hungry for a challenge, and have the guts to speak your mind, you could be a perfect fit. We offer an excellent PTO program, great health benefits, a casual and friendly environment, remote work, and a leadership team who truly believes in your growth – both personally and professionally. Firstup is committed to providing equal employment opportunities to all applicants for employment and to all employees, without regard to race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, protected disability, veteran status, or any other protected status in accordance with applicable federal, state or local laws. ## #LI-TM1 #LI-Remote ## About Firstup ## Company Overview - **One-liner**: Firstup provides an intelligent communication platform that helps large organizations engage, inform, and activate their workforce through personalized, multi-channel messaging. - **Entity Type**: Private (Series D; total funding $114.8M) - **Headquarters**: San Francisco, California, United States - **Founded**: 2008 - **Founders**: Greg Shove and Nicole Alvino ## Core Business - **Primary industry**: Workforce communications and employee experience software - **Target customers**: Large enterprises with deskless/frontline workers (healthcare, manufacturing, distribution, retail, aviation, etc.) - **Mission/purpose**: "Empower organizations to put their people first" by cutting through communication noise and driving measurable business outcomes. ## Products & Services - **[Firstup Intelligent Communication Platform](https://firstup.io)**: A unified SaaS platform that enables hyper-personalized employee journeys, automated campaigns, and real-time engagement analytics. Includes: - **Employee App**: Mobile-first communication for deskless workers. - **Employee Intranet**: Centralized personalized workspace. - **Employee Email**: Intelligent timing and targeting to break through inbox clutter. - **Digital Signage**: Targeted messages for break rooms and common areas. - **Integrations**: Seamlessly connects with Microsoft, Workday, ServiceNow, and other HR/IT tools. ## Market Standing - **Valuation**: Not publicly disclosed (private company) - **Key Metric**: Annual revenue estimated at $100M (LinkedIn data) - **Total Funding**: $114.8M across 6 rounds, including: - Series D (2016): $25M led by Akkadian Ventures - Series E (2018): $10M led by DTCP - Earlier rounds from Rembrandt Venture Partners and others - **Notable Investors/Partners**: Akkadian Ventures, Rembrandt Venture Partners, DTCP; integrations with Microsoft, Workday, ServiceNow - **Growth Signals**: - Named a **Leader in the 2025 Gartner® Magic Quadrant™ for Intranet Packaged Solutions** - Case study: Swissport unified 45,000 employees across 300 airports with 75% frontline engagement - Case study: Southern Company Gas saved 91K hours and $3.9M - LinkedIn followers grew **101.3% year-over-year** (37,672 followers as of late 2025) ## Competitive Advantages - **AI-powered personalization**: Automates targeted, role-based communication across channels (mobile, email, intranet, signage). - **Frontline-first focus**: Designed specifically for deskless and shift workers, a large underserved segment. - **Proven ROI**: Forrester TEI study quantified improvements in frontline retention, productivity, and safety for a 10,000-employee organization. - **Deep integrations**: Native connections with major enterprise platforms (Microsoft, Workday, ServiceNow) reduce friction. ## Strategic Focus - **AI as a core differentiator**: "AI that works as hard as your workforce" – providing virtual assistants for employees, content creation tools for communicators, and analytics for leaders. - **Expanding in healthcare, manufacturing, and retail** verticals where frontline communication is critical. - **Continued international growth** (offices in London, presence across 8 countries). ## Why Work Here - **Culture & values**: Emphasizes innovation, accountability, transparency, teamwork, and speed. "Be real" (fact-based, authentic feedback) and "operate with pace and urgency." - **Remote/hybrid policy**: Mix of remote-first roles (e.g., UK-based Software Engineer) and hybrid roles (e.g., Chicago Sales Development Representative). Headquarters in San Francisco. - **Benefits**: Paid volunteer days, donation matching program, and a focus on "community" both inside and outside the company. - **Engineering environment**: Roles for fullstack, frontend, mobile UX, and cloud operations; uses AI tools in hiring process. - **Headcount**: Approximately 194–300 employees (conflicting reports: LinkedIn shows 194 with -3.9% YoY decline; Wikipedia states 300). Distributed across 8 countries. ## Sources 1. [firstup.io](https://firstup.io) 2. [Firstup Careers](https://firstup.io/careers/) 3. [LinkedIn Company Page](https://www.linkedin.com/company/firstup-io) 4. [Wikipedia](https://en.wikipedia.org/wiki/Firstup) ## Other roles at Firstup - [Sr. Site Reliability Engineer (UK)](https://feeny.ai/job/sr-site-reliability-engineer-uk-firstup-london-ceak3xy02k4s) — London, United Kingdom - [Sales Development Representative - Chicago (Hybrid) - Healthcare](https://feeny.ai/job/sales-development-representative-chicago-hybrid-healthcare-firstup-chicago-5bycmbcaxjr5) — Chicago, IL - [Account Executive (Dubai)](https://feeny.ai/job/account-executive-dubai-firstup-dubai-ze5zk3vfyaeq) — Dubai, United Arab Emirates - [Account Executive (Sweden)](https://feeny.ai/job/account-executive-sweden-firstup-sweden-aw49mt1ppwn0) — Sweden - [Account Executive - Healthcare](https://feeny.ai/job/account-executive-healthcare-firstup-united-states-x28fcyp5xab9) — United States - [Senior Data Engineer (US)](https://feeny.ai/job/senior-data-engineer-us-firstup-united-states-xkdxj61xy54s) — United States - [Head of Digital Marketing](https://feeny.ai/job/head-of-digital-marketing-firstup-chicago-r0pzksgbyf7n) — Chicago, IL - [Account Executive (London, England)](https://feeny.ai/job/account-executive-london-england-firstup-london-jz1c8t7pa86e) — London, United Kingdom - [Senior Data Engineer (UK)](https://feeny.ai/job/senior-data-engineer-uk-firstup-london-ssss4cdw12rj) — London, United Kingdom - [Sr. Software Engineer, Fullstack - Remote](https://feeny.ai/job/sr-software-engineer-fullstack-remote-firstup-united-states-869fkttmghrx) — United States