I

Senior Fullstack Developer

ideawise group β€’ European Union
Remote
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AI Summary

We are seeking a Senior Fullstack Developer to design, build, and optimize systems that increase visitor conversion, accelerate A/B test velocity, and improve page speed. The ideal candidate will have experience with React, TypeScript, and Node.js, as well as a strong understanding of analytics instrumentation and AI-assisted development workflows. The role requires a minimum of 5 years of experience in frontend-driven fullstack product environments and strong expertise in React and TypeScript.

Key Highlights
Design, build, and optimize systems for conversion rate improvement
Implement A/B testing frameworks and feature flags
Ensure scalable architecture and high-performance systems
Key Responsibilities
Own high-converting funnel architecture
Build and optimize onboarding flows
Implement multi-step signup and activation systems
Design resilient event tracking for funnel reporting
Technical Skills Required
React TypeScript Node.js
Benefits & Perks
Impact-driven work
Autonomy and innovation
Collaborative and global culture
Nice to Have
Experience in freemium or subscription-based products
Experience in high-traffic consumer platforms
Familiarity with Redis and caching strategies

Job Description


πŸš€ Build Growth Systems, Not Just Features


At Ideawise, we operate as an AI-native product organization.

Our goal is to ship faster, experiment more aggressively, and scale acquisition systems using AI-assisted engineering workflows.


Our Dating Framework powers high-growth subscription products across web and mobile. The Acquisition Squad owns the entire top-of-funnel experience β€” from landing page to activation β€” and is directly accountable for measurable growth.


We are looking for a Senior Fullstack Developer who thinks in terms of:

  • Conversion systems
  • Experimentation velocity
  • Scalable architecture

β€”not just feature delivery.


🎯 Your Mission (Acquisition Squad)


You will design, build, and optimize systems that:

  • Increase visitor β†’ signup β†’ activation conversion
  • Accelerate A/B test velocity
  • Reduce funnel drop-off
  • Improve page speed & Core Web Vitals
  • Enable marketing experimentation at scale
  • Support subscription growth mechanics

Your work directly impacts revenue.


βš™ What You’ll Actually Do


πŸ— Own High-Converting Funnel Architecture

  • Build and optimize onboarding flows (web, mobile web, app)
  • Implement multi-step signup and activation systems
  • Design resilient event tracking for funnel reporting
  • Develop campaign and landing page systems optimized for paid traffic


πŸ§ͺ Engineer for Experimentation

  • Implement A/B testing frameworks and feature flags
  • Build systems that allow rapid UI and copy variation
  • Ensure statistical validity and clean experiment instrumentation
  • Maintain experiment guardrails to prevent revenue cannibalization


⚑ Performance & Scalability

  • Reduce load times and improve Core Web Vitals
  • Optimize API response times under traffic spikes
  • Introduce caching strategies (Redis/CDN/edge-aware logic)
  • Ensure mobile-first responsiveness and SEO integrity


πŸ’³ Subscription & Revenue Mechanics

  • Implement pricing experiments and upsell triggers
  • Build event-driven communication triggers
  • Integrate payment systems (Stripe or similar)
  • Design eligibility logic for subscription offers



πŸ€– Work AI-Native


We aim for 80–90% AI-assisted development.

You will:

  • Maintain and improve CLAUDE.md / AGENTS.md documentation
  • Write test-first specifications for AI agents
  • Review AI-generated PRs for architectural integrity
  • Improve module boundaries for AI legibility
  • Use AI to accelerate experimentation β€” not replace thinking

Your leverage comes from system design and review β€” not typing speed.



🧠 What We’re Looking For


βœ… Must-Haves

  • 5+ years in frontend-driven fullstack product environments
  • Strong React + TypeScript expertise
  • 3+ years of work experience with React Native
  • Backend experience (Node.js, Symfony, or equivalent)
  • Experience building conversion funnels or subscription flows
  • Hands-on A/B testing implementation experience
  • Strong understanding of analytics instrumentation (GA4, Amplitude, Segment, Mixpanel)
  • Experience optimizing frontend performance under real traffic
  • Comfortable working with AI coding tools (Cursor, Claude Code, Copilot, etc.)
  • Fluent English and comfortable in distributed teams


βž• Strong Plus

  • Experience in freemium or subscription-based products
  • Experience in high-traffic consumer platforms
  • Experience with SEO-sensitive landing page systems
  • Familiarity with Redis / caching strategies
  • Experience with CI/CD (GitLab or GitHub Actions)
  • Experience designing event-driven systems
  • Exposure to growth experimentation culture


πŸ”Ž How We Evaluate You


We care about:

  • Your ability to quantify impact (conversion, retention, revenue)
  • Your system thinking, not just UI implementation
  • Your comfort with AI-assisted workflows
  • Your ownership mindset around KPIs
  • Your ability to balance experimentation speed with maintainability


πŸ“Š What Success Looks Like After 6 Months

  • Experiment velocity increased significantly
  • Conversion rate improvements backed by data
  • Landing page load time measurably reduced
  • Clean, maintainable funnel architecture
  • AI-assisted development workflows operating smoothly
  • Clear ownership of funnel KPIs


🧩 How We Work

  • Small autonomous squad
  • Direct collaboration with product, marketing, and analytics
  • Data-first decisions
  • Outcome > output
  • High experimentation tolerance
  • AI as force multiplier, not shortcut


πŸ’‘ Why Join the Acquisition Squad?

  • Direct revenue impact
  • High visibility inside the company
  • Fast feedback loops
  • AI-native engineering culture
  • Ownership from architecture to KPI


What’s In It for You?


  • πŸš€ Impact-Driven Work – Your contributions directly influence user growth and business success.
  • πŸ’‘ Autonomy & Innovation – We value proactive problem-solvers who drive innovation beyond just completing tasks.
  • 🌍 Collaborative & Global Culture – Work with top-tier professionals across different disciplines in a diverse, international team.
  • 🎯 Growth & Learning – Access to cutting-edge technologies, mentorship opportunities, and professional development resources.
  • 🌍 Work Remotely, Collaborate Globally – Join a fast-moving, borderless team that ships and scales.



How to Apply

If you’re excited by what we’re building and passionate about engineering with impact, we’d love to hear from you.

πŸ“© Apply with your CV and a short note telling us why this role resonates with you.


Our Commitment to DEI

At Ideawise, we believe diversity fuels innovation. We’re committed to creating an inclusive environment where people from all backgrounds can thrive. Different perspectives, experiences, and ideas drive the success of our ventures, shaping the future we’re building.

We welcome applicants of all races, ethnicities, religions, gender identities, sexual orientations, abilities, ages, and backgrounds. What matters most is your passion, expertise, and vision. Let’s build something greatβ€”together.


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