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For Companies At a Glance
- Tasks: Take ownership of features from design to delivery in a collaborative team.
- Company: Zelt is revolutionising how organisations manage their people with an all-in-one platform.
- Benefits: Enjoy competitive pay, health insurance, equity, and the chance to earn airline miles.
- Why this job: Work on ambitious projects that make a real impact from day one in a culture of excellence.
- Qualifications: Strong experience in fullstack development with JavaScript/TypeScript, Node.js, React, AWS, and PostgreSQL.
- Other info: Join early to shape the product while benefiting from established market momentum.
The predicted salary is between 48000 - 72000 £ per year.
About Zelt
Zelt is on a mission to rebuild how organisations run. Our all-in-one platform helps modern companies manage their people across payroll, onboarding, time off, IT provisioning and more, in a seamless and automated way.
We are the only platform on G2 named a Global Momentum Leader across HR, Payroll and IT, and we are just getting started. Our product is technically ambitious, structurally different from anything else on the market, and already trusted by forward-thinking companies.
Why this role matters:
As a Senior Fullstack Engineer at Zelt you will own product development end to end, from architecture to marketing events.
This is the ideal moment to join: Zelt has product-market fit and strong backing, yet it is still early enough that your decisions will shape the platform’s architecture and user experience for years to come. Every feature you build will reach customers quickly and be visible in the product.
You will join a lean, product-focused team where your input shapes both what we build and how we deliver it. This is a chance to work with a diverse, international team on a product that positively impacts customers every day.
What you will do:
- Design, build and maintain scalable applications across the stack using React, TypeScript, Node.js, NestJS, PostgreSQL, AWS
- Take end-to-end ownership of features including architecture, testing, deployment and iteration
- Work closely with product and design to align technical execution with user needs
- Write clean, maintainable, well-tested code and champion engineering best practices
- Improve developer workflows and tooling (GitHub, GitHub Actions, Slack, Linear, Sentry, SolarWinds) to keep the team fast and productive
- Contribute to infrastructure (Docker, AWS ECS, RDS, S3, SES, CloudFront, CDK) and ensure reliability at scale
- Share knowledge, mentor peers and foster a collaborative, learning-oriented engineering culture.
What we are looking for:
- Strong experience delivering fullstack applications in fast-moving product environments
- Deep expertise in React, TypeScript, Node.js, NestJS, PostgreSQL and experience running services on AWS
- Understanding of modern infrastructure: Docker, AWS ECS/RDS/S3/SES/CloudFront/CDK
- Experience with developer and collaboration tools: GitHub, GitHub Actions, Slack, Linear, Sentry, SolarWinds
- Excellent communicator and team player, open to learning and sharing knowledge with others
- Sense of ownership and pride in your work, motivated by outcomes rather than tasks.
Nice to have:
- Startup or scale-up experience in small, fast-moving teams
- Familiarity with CI/CD, observability and scaling infrastructure
- A track record of improving performance, code quality or developer experience.
Why join Zelt:
- Get equity in a high-growth startup backed by the investors of Notion, Spotify and Airbnb
- Work with a diverse, international team on a product that delivers real value to customers every day
- Direct ownership and visible impact from day one, your code will power systems that thousands of people use daily
- A culture that values technical excellence, curiosity and continuous learning
- Competitive compensation, benefits including health insurance, and the opportunity to join at the right time with product-market fit already achieved and big technical challenges ahead.
Your work at Zelt will not disappear into the background, it will help define how modern companies run their people operations.
Senior Fullstack Engineer employer: Zelt
Contact Detail:
Zelt Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Fullstack Engineer
✨Tip Number 1
Familiarise yourself with Zelt's platform and its unique features. Understanding how their all-in-one solution works will help you demonstrate your enthusiasm and knowledge during any discussions or interviews.
✨Tip Number 2
Showcase your experience with the specific technologies mentioned in the job description, such as Node.js, TypeScript, and React. Be prepared to discuss past projects where you've successfully implemented these technologies.
✨Tip Number 3
Highlight your problem-solving skills by preparing examples of challenges you've faced in previous roles. Zelt values a strong problem-solving ability, so having concrete examples ready can set you apart.
✨Tip Number 4
Engage with Zelt's online presence, whether through social media or tech forums. This can give you insights into their culture and current projects, which you can reference in your conversations to show genuine interest.
We think you need these skills to ace Senior Fullstack Engineer
Some tips for your application 🫡
Tailor Your CV: Make sure your CV highlights your experience with fullstack applications, particularly in JavaScript/TypeScript, Node.js, React, AWS, and PostgreSQL. Use specific examples that demonstrate your problem-solving skills and attention to code quality.
Craft a Compelling Cover Letter: In your cover letter, express your enthusiasm for Zelt's mission and how your background aligns with their goals. Mention your experience in fast-moving product environments and your ability to collaborate effectively within teams.
Showcase Your Projects: If you have relevant projects or contributions to open-source software, include links to these in your application. Highlight any features you've taken from idea to implementation, especially those that demonstrate your technical skills and ownership.
Prepare for Technical Questions: Anticipate technical questions related to the technologies mentioned in the job description. Be ready to discuss your approach to building scalable applications and improving developer workflows, as well as any new technologies you’ve recently explored.
How to prepare for a job interview at Zelt
✨Showcase Your Fullstack Experience
Be prepared to discuss your previous projects in detail, especially those involving JavaScript/TypeScript, Node.js, React, AWS, and PostgreSQL. Highlight specific challenges you faced and how you overcame them, as this will demonstrate your problem-solving skills.
✨Emphasise Collaboration Skills
Zelt values clear communication and teamwork. Be ready to share examples of how you've collaborated with product and design teams in the past. This could include discussing how you aligned technical execution with user needs or contributed to team discussions.
✨Demonstrate Ownership and Pride in Your Work
Express your sense of ownership over your projects. Talk about how you take features from idea to delivery, and share instances where you went above and beyond to ensure quality and architectural integrity in your code.
✨Stay Updated on New Technologies
Zelt is looking for someone who stays on top of new technologies. Prepare to discuss any recent trends or tools you've explored and how they could be applied to improve workflows or processes within a team setting.
