Full Stack Engineer

FULL STACK ENGINEER

Stockholm · On-Site · Full-Time · Immediate Start

Who We Are

We are a well-funded, early-stage technology company on a mission to fundamentally redefine the way the world searches, discovers, and transacts, built on a philosophy that puts the user first at every step.

The user is not simply a means of transaction. They are a valued participant whose data works for them, not against them, enriching their world and their own experience within it, with them retaining full control.

Our mission is underpinned by proprietary, patent-pending technology built on a novel engine and system.

The Problem You Will Be Solving

The internet was built to inform the many, not to serve the individual. Platforms optimize for engagement, extraction, and consumption at global scale. AI has made this model even more efficient, with the user still largely remaining the input, not the full beneficiary.

The problem is not information. The world has never had more. The problem is that people give away a lifetime of data without receiving the personalized experience it should enable.

People should not have to search. They should simply find.

Who You Are

•       Highly talented and motivated to build products with people, for people

•       You thrive in zero-to-one environments and find genuine satisfaction in creating from scratch

•       A fast-paced thinker with a relentless desire to learn, improve, and raise the standard around you

•       Able to inspire, elevate, and collaborate; you make the people around you better

•       A great communicator; you express complex ideas with clarity, precision, and confidence across all levels of the organization

•       Able to transform ideas into working systems and technical milestones with light speed and precision

•       Highly ambitious and action-driven; you thrive under pressure and find genuine energy in working at the edge of what is considered possible

•       Capable of designing and building production-grade systems in a fourth of the time most experienced and “sane” professionals would consider possible

What You Will Do

•       Build high-performance consumer-facing search and discovery interfaces that serve as the primary surface for user interaction with the platform

•       Build real-time social and communication interfaces that handle live state, persistent connections, presence, and concurrent user interactions under variable network conditions

•       Build end-to-end transactional flows that guide users through complex multi-step sequences with clear state management, robust error handling, and seamless recovery

•       Treat frontend performance as a first-class engineering discipline, owning bundle architecture, rendering strategy, lazy loading, and Core Web Vitals as measurable engineering metrics

•       Build and own the full stack beneath the UI, including backend services, data access patterns, and API contracts between frontend and platform layers

•       Work directly from design specifications to deliver polished user experiences, systematically closing the gap between design intent and final shipped product while identifying and resolving edge cases

Minimum Qualifications

•       MSc in Computer Science or Software Engineering from KTH, Chalmers, or an institution of equivalent standing — or equivalent demonstrated production experience building consumer products at scale

•       Expert-level React and Next.js; architectural understanding of the framework including rendering strategies, state management trade-offs, and framework internals

•       Production proficiency in Go or Rust on the backend; writes systems code, not only UI code

•       Demonstrated track record shipping consumer products used by real people at meaningful scale

•       Demonstrated performance engineering on real consumer systems; you have measured, profiled, and improved load times and rendering with evidence, not estimates

Preferred Qualifications

•       Background from Lovable, Google, Epidemic Sound, Spotify or comparable consumer product companies

•       Demonstrated performance engineering work on real production systems with measurable outcomes

•       Ability to take a product from design to production at a pace that resets expectations for the team

•       2–7 years of relevant experience

What We Offer

Expect the most talented, rigorous, and driven colleagues you have worked with; people who lift each other up and hold each other to the highest standard. This company is driven by ideas and innovation, regardless of age, position, or background. The best ideas must win and the people behind them recognized and rewarded.

A home for exceptional people and geniuses within their domain; those who have always known what they are capable of and have been waiting for the environment to prove it to the world, whilst first being seen and supported by their coworkers.

Compensation includes an attractive salary and meaningful equity ownership for an early-stage startup.

Equal Opportunity

We are an equal opportunity employer committed to building an inclusive, high-performance culture where everyone can do their best work and reach their full potential. We welcome applicants of all backgrounds and do not discriminate on the basis of race, color, religion, national origin, gender, gender identity or expression, sexual orientation, age, disability, or any other characteristic protected by applicable law.

Application

To apply, send your CV/resume with direct references, GitHub profile, LinkedIn profile, and a brief note on how and why you would like to contribute to our mission to careers@qiclassified.com. Upon initial acceptance, an in-person interview will follow shortly in Stockholm, Sweden.

Please note that all applications and interviews are conducted in English. Fluency in written and spoken English is a requirement for all roles.

All applications are treated with strict confidentiality.