Sr. Software Engineer, Fullstack (UK)

Firstup Inc.

Job Overview

Location

Remote - UK

Job Type

Full-time

Full Job Description

📋 Description

• As a Sr. Software Engineer, Fullstack at Firstup Inc., you will play a critical role in enhancing the employee experience by building and maintaining the communication pipeline that serves 40 Fortune 100 companies and connects over 17 million employees daily.
• You will design, develop, and deliver innovative, scalable solutions for Firstup's public APIs, Agentic tools, third-party integrations with enterprise systems (such as HRIS platforms), and shared platform services, while continuously improving architecture, scalability, availability, and fault tolerance.
• You will work within a team of experts in employee experience, workforce communications, and technology, contributing to a mission-driven culture focused on making work better for every worker from hire to retire.
• You will actively leverage Generative AI tools and coding agents in your daily workflow to accelerate delivery, improve code quality, and stay at the forefront of modern software engineering practices.
• You will collaborate across teams to ensure seamless integration and high performance of platform services, supporting Firstup’s goal of delivering engagement insights that help companies support, promote, and retain talent.
• You will contribute to technical excellence by participating in code reviews, architectural discussions, and continuous improvement initiatives that uphold the platform’s reliability and innovation.

🎯 Requirements

• Proven experience as a Software Engineer with strong fullstack development skills, including both frontend and backend technologies.
• Hands-on experience building and maintaining public APIs and integrating with enterprise systems such as HRIS platforms.
• Demonstrated ability to design scalable, fault-tolerant systems with a focus on performance, availability, and observability.
• Active user of Generative AI tools and coding agents to enhance development velocity and code quality.
• Strong collaboration skills and experience working in remote, cross-functional teams.

🏖️ Benefits

• Opportunity to work remotely from the UK with a global, mission-driven company impacting over 17 million employees daily.
• Engage with cutting-edge technologies including AI-powered development tools and intelligent communication platforms.
• Contribute to meaningful work that improves the employee experience for Fortune 100 clients and their workforces.
• Professional growth through exposure to complex platform services, architecture, and scalable system design.
• Collaborative and innovative culture that values experimentation, continuous learning, and technical excellence.

Skills & Technologies

Full Stack

Senior

Remote

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Firstup Inc.

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About Firstup Inc.

Firstup Inc. provides a workforce communications platform that unifies notifications, campaigns, and content delivery across email, mobile, and digital signage. Its cloud software ingests HRIS and engagement data to personalize messages, automate scheduling, and surface analytics for internal communicators and operational leaders. Serving enterprises with distributed or frontline employees, the system integrates with Microsoft 365, Workday, and other core systems to reduce information overload and improve reach, readership, and response rates across corporate and plant locations.

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