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Sr. Software Engineer, Fullstack (UK)

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92% of candidates apply because they are a Most Loved Workplace®

About the Role

At Firstup , a Most Loved Workplace® certified employer in the SaaS Technology Company space.

We are seeking a senior back-end/full-stack Software Engineer to join our team building and evolving our flagship digital web presence. The ideal candidate brings deep experience building scalable .NET services, strong SQL skills (with SQL Server preferred), and expertise designing and operating GraphQL and RESTful APIs. You will collaborate with cross-functional teams and partners to deliver reliable, secure integrations across application services, data stores, and CMS capabilities (with Optimizely experience highly preferred). Front-end experience (e.g., Next.js) is nice to have but not required.

Want to learn more about what it's like to work at Firstup ? View our full profile.

Requirements

  • Deep experience building scalable .NET services
  • Strong SQL skills (with SQL Server preferred)
  • Expertise designing and operating GraphQL and RESTful APIs
  • Experience with Optimizely is highly preferred
  • Front-end experience (e.g., Next.js) is nice to have but not required

Benefits

  • Robust health insurance plans, including Medical, Dental, and Vision coverage
  • 401(k) Retirement Plan with a $1 for $1 Company Match up to 5%
  • Paid Parental Leave
  • Associate Assistance Plan
  • Education Assistance Program
  • Up to $30,000 in Adoption Assistance
  • Up to three weeks of vacation annually
  • Generous Holiday, Sick Leave, and Personal Day policies
  • New Hire Referral Bonus Program
  • Significant Home Purchase Discounts
  • Unique opportunities such as the Everyone’s Included Day

Prefer to apply on the company's career site?

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Why This Is a Most Loved Workplace® Certified Job

Certified for: Most Loved Workplace Most Loved Workplaces® 2026

Frequently Asked Questions About Working at Firstup

Common questions candidates ask about this role and Firstup 's workplace

The world’s first intelligent communication platform. Every company can now connect the employee experience ecosystem, personalize the employee journey, and get insights to improve engagement, productivity, and retention.

Please review the specific job listing or contact Firstup 's recruiting team for details on remote or hybrid work options for this role.

Salary information may vary by role and location. Please check the specific job listing or discuss compensation during the interview process.

Firstup is an established organization in its industry. The company is a certified Most Loved Workplace®, highlighting a strong, positive culture and committed workforce.

For this role specifically, benefits include: Robust health insurance plans, including Medical, Dental, and Vision coverage, 401(k) Retirement Plan with a $1 for $1 Company Match up to 5%, Paid Parental Leave, Associate Assistance Plan, Education Assistance Program, Up to $30,000 in Adoption Assistance, Up to three weeks of vacation annually, Generous Holiday, Sick Leave, and Personal Day policies, New Hire Referral Bonus Program, Significant Home Purchase Discounts, Unique opportunities such as the Everyone’s Included Day. You can view more details on their CertCheck profile.

Working at Firstup involves collaborating with a dedicated team in a dynamic environment.

As an organization recognized for its culture, Firstup values respect, inclusivity, and a positive environment for all employees.

They have earned Most Loved Workplace® certifications including: Most Loved Workplace Most Loved Workplaces® 2026.

Firstup currently has 14 open positions. You can view all current openings at certcheck.mostlovedworkplace.com/companies/firstup/jobs.

The interview process typically involves an initial recruiter screen followed by team interviews. Please contact Firstup 's recruiting team for specific details on this role's process.

Apply for Sr. Software Engineer, Fullstack (UK)

Submit your application directly to the Firstup team. Let them know why you'd be a great addition to their loved place to work.

Firstup

Firstup

SaaS Technology Company
1 Montgomery St Suite 2150, San Francisco, CA
Most Loved Workplace® Certified Job
View Company Profile

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