Fullstack Engineer

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
• Bonus: Experience building data visualization components
• Bonus: Experience with workflow engines and async job orchestration

You should apply if any of the following excite you:

Why Oneleet?

Perks & Benefits

• Comprehensive health & wellness benefits
• 20 days PTO per year, plus 8 floating holiday
• Remote work culture
• Team off-sites in stunning places (Amsterdam, Italy, etc).
• Competitive compensation & equity
• We hire globally and compensate competitively within each market using geographic pay bands. The range for this role reflects a US national baseline. Offers for candidates in higher cost-of-labor markets (e.g., San Francisco, New York, Zurich) may fall at or above the top of the posted range, while offers in other markets are benchmarked to local standards and are lower. Within any range, individual compensation is determined by work location, skills and experience demonstrated through the interview process, and relevant education or training. This posting reflects base salary only and does not include equity or benefits.
• Remote-First & Global Hiring
• We’re a remote-first company and hire globally in regions where we can legally engage talent directly or via our employer-of-record (EOR) partner. If you’re based outside the U.S., we’ll explore the most compliant hiring arrangement for your location. We make hiring decisions based on merit, skills, and potential regardless of location.
• U.S. Hiring & E-Verify
• For U.S.-based candidates, Oneleet participates in E-Verify to confirm employment eligibility, in accordance with federal regulations. We are an equal opportunity employer. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other characteristic protected by applicable law.