Fullstack Engineer
Oneleet
Role Description
As a Fullstack Engineer at Oneleet, you'll work across our entire stack to ship features that make our cybersecurity platform fast, reliable, and genuinely useful for security teams. You'll own features end-to-end — from backend services and APIs through to the UI components that customers interact with day-to-day.
This is a hands-on engineering role at a Series A startup. You'll work closely with backend engineers, AppSec, design, and product to take features from mock-up to shipped product, and you'll engage directly with customers to iterate based on real-world usage.
Working primarily in Go, TypeScript, and React, you'll help us ship fast without sacrificing reliability or design quality.
Key Responsibilities
- Build features end-to-end across backend (Go) and frontend (React/TypeScript)
- Design and implement APIs that power dashboards, workflows, and reporting
- Build UI components that present complex data clearly and drive user action
- Map complex backend data to clear, actionable interfaces
- Implement robust error handling and fallback behaviors for upstream service failures
- Optimize end-to-end performance, including caching, pagination, and query design for high-volume data
- Develop reusable patterns and components that scale across many areas of the platform
- Work directly with customers and design partners to understand how features are used and iterate rapidly
- Build monitoring and analytics to track feature usage, success rates, and user engagement
- Collaborate with AppSec, backend, and design on how data flows from services through to the UI
Qualifications
- 5+ years of fullstack software development experience with expertise in Go and JavaScript/TypeScript
- Strong experience building production APIs (REST and/or gRPC) and integrating with third-party services
- Proven track record of building responsive, intuitive user interfaces with modern JavaScript frameworks (React preferred)
- Experience with data transformation and mapping between different system formats
- Strong understanding of asynchronous programming patterns and API optimization techniques
- Solid debugging skills across the full stack — from backend services to frontend UI
- Experience with production monitoring, logging, and observability tools
- Experience gathering requirements from users and translating feedback into technical improvements
- Strong communication skills and comfort working directly with customers
- Ability to balance technical excellence with shipping features that provide immediate value
Bonus
- Background in cybersecurity or security tools
- Experience building data visualization components
- Experience with workflow engines and async job orchestration
Benefits
- Comprehensive health & wellness benefits
- 20 days PTO per year, plus 8 floating holidays
- Remote work culture
- Team off-sites in stunning places (Amsterdam, Italy, etc.)
- Competitive compensation & equity
$150k - $220k
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