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FirstupFI

Sr. Software Engineer, Fullstack

Firstup is fundamentally changing how organizations communicate and is the backbone of the entire Digital Employee Experience.

Firstup

Employee count: 51-200

United Kingdom only

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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

We're looking for a Senior Full Stack Engineer who thrives at the intersection of craft and scale. You'll design and deliver large-scale, multi-tenant cloud services — with a relentless focus on availability, fault-tolerance, and elegant architecture. You'll set the bar for engineering quality and help elevate those around you.

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.

  • 5+ 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, or React.js is a strong plus.

  • Proven full-stack experience across frontend (React.js), backend, and database layers.

  • 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, 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.

About the job

Apply before

Posted on

Job type

Full Time

Experience level

Senior

Education

Bachelor degree

Experience

5 years minimum

Experience accepted in place of education

Location requirements

United Kingdom

Hiring timezones

United Kingdom +/- 0 hours

Job categories

Full Stack EngineeringBackend EngineeringFrontend EngineeringSoftware Engineering

Skills

NodeJS RemoteRuby on RailsTypeScriptReactGitHub Co PilotClaudeGitHubMakeMovementServerless

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About Firstup

Learn more about Firstup and their company culture.

View company profile

Firstup is fundamentally changing how organizations communicate and is the backbone of the entire Digital Employee Experience. From the front line to the C-suite, we help deliver targeted information at the right time, in the right place, and in the right language. We are unifying the digital workplace and giving workers personalized access to all the systems, resources, and applications they need to do their jobs.

Joining Firstup means joining a movement to connect every worker. This movement has taken root and is evident in our world-class customer base and their millions of employees worldwide. Now we need your help. Ready to make a difference in the world.

Our Values

  • Every Employee is an Owner with responsibility and credit for our progress

  • Leadership is in our build and we see change as a catalyst for improvement

  • We win as a team, committed to help our coworkers and customers thrive

Employee benefits

Learn about the employee benefits and perks provided at Firstup.

View benefits

Disability insurance

Disability insurance so you don't have to worry.

Stock options

Every employee gets equity, so you are rewarded for your best work.

Life insurance

Life and accidental death & dismemberment insurance so you don't have to worry.

Unlimited PTO

You can’t mobilize if you don’t rest and recharge—so take as much paid time off as you need.

View Firstup's employee benefits
Claim this profileFirstup logoFI

Firstup

Company size

51-200 employees

Founded in

2008

Chief executive officer

Gary Nakamura

Markets

Internal CommunicationsEmployee CommunicationsEmployee EngagementWorkforce CommunicationsSaaS

Employees live in

United StatesIreland
View company profile

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