Remote Sr. Software Engineer, Fullstack (UK)

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. Now we need your help. 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 are an active user of Generative AI tools and coding agents, applying them daily to accelerate delivery and improve code quality. Develop and own integrations with external enterprise systems, including HRIS platforms such as Workday, SAP SuccessFactors, and Dayforce. Write high-quality code (reliable, readable, efficient, testable, scalable, maintainable), provide thorough code reviews, and create comprehensive tests and documentation. Actively use Generative AI tools and coding agents in day-to-day workflows to improve code quality and accelerate

delivery. Collaborate across teams on industry standards and best practices to help others solve complex problems. Identify, analyse, and resolve system availability, reliability, and performance issues, contributing to observability and resiliency improvements. Bachelor’s degree in Computer Science or related field, or equivalent experience. 5+ years building reliable, performant applications and microservices. Strong proficiency in TypeScript and Node.js. Ruby experience is a plus. Proven full-stack experience across frontend (React.js), backend, and database layers. Technical depth in at least one specialisation: networking, security, serverless, event streams, or similar. Strong AWS experience, including compute, storage, networking, and monitoring. Experience building and maintaining integrations with HRIS platforms such as Workday, SAP SuccessFactors, Dayforce, or similar enterprise HR systems. Experience with Datadog or similar observability and monitoring platforms. Demonstrated use of Generative AI tools or coding agents in development workflows. Familiarity with ML/AI integration in production systems. Open-source contributions or a history of side projects. 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-Remote We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. If you would like more information about how your data is processed, please contact us.