Product Engineer, Experience (Frontend)

Callimacus; Lazio; In loco; EUR 45.000 - 65.000; Tempo pieno

Vantaggi offerti da questo lavoro

Top-of-the-Italian-market salary

Equity

Excellent offices in Milan

Health insurance

Welfare budget

Gym & wellbeing programs

Meals and snacks

Descrizione del lavoro

Callimacus is hiring a product-focused Frontend Engineer to lead rendering, SDK design, and component systems for enterprise frontends in Milan. You will optimize streaming, hydration, and perceived performance while delivering a first-class developer experience.

The role requires strong TypeScript and React skills, 4–6 years (Mid) or 6+ years (Senior) frontend experience, and a passion for performance. In-person work in Milan with equity and growth opportunities.

Competenze

• Strong TypeScript and React knowledge with a track record of shipping polished production frontends.
• Experience designing developer experience as a product surface.
• 4-6 years (Mid) or 6+ years (Senior) frontend experience.

Mansioni

• Own the rendering path and performance on sites we don't control.
• Build the TypeScript SDK customers integrate.
• Design the component and composition system.
• Sweat the performance envelope including Core Web Vitals and edge delivery.

Conoscenze

TypeScript

React

Frontend development

DX

Strumenti

Node.js

AWS

Descrizione del lavoro

About Callimacus

At Callimacus, we're working to change how people interact on the web. For the past 30 years, the user experience as we know it has been anchored to a typographic paradigm - predefined navigation trees of pages, sections, and menus - established in the Nineties when the web was born.

As the way people get informed, entertained, and shop evolves, traditional websites and interfaces are losing relevance, and the tools available limit the creative evolution of digital experiences. Callimacus was born from the conviction that the whole web experience can and should be reinvented.

So we built the engine for a different kind of digital experience. Callimacus is a multi-agentic platform that plugs into a company's existing stack and reads multi-dimensional signals to understand what a visitor wants in the moment. Then, in milliseconds, our proprietary technology composes the entire interface around that intent, selecting the most relevant content and components as the person interacts.

Callimacus was founded in 2024 with the early backing of Brunello Cucinelli - one of our first investors, and now one of our customers. We launched in January 2026 to organic interest from enterprise customers, and recently raised from Salesforce Ventures the largest AI investment they have made in Italy, and one of their most significant in Europe.

We are a small, product-focused, founder-led team. We work on hard problems that haven't been solved before - by us or anyone else - and the people who join now get to solve them. We move fast, with high agency and strong ownership.

What you’ll build

• Own the rendering path. The pipeline that turns composed output into an experience that feels immediate - streaming, hydration, and perceived performance on sites we don't control.


• Build the SDK customers integrate. The TypeScript SDK that drops into enterprise frontends - API design, developer experience, and documentation people actually enjoy using.


• Design the component and composition system. Interfaces assembled on the fly by agents still have to feel deliberate and on-brand. You make that true.


• Sweat the performance envelope. Core Web Vitals, bundle discipline, and edge delivery - on our customers' sites, under their traffic.


• Shape the integration experience. From first npm install to production, across stacks and frameworks we don't choose.

What matters to us

• Ownership. You feel deeply responsible for your work and behave accordingly - from design through production and after. You don't wait to be told what to do; you see problems and act. \"It\'s not my job\" is not part of your mindset.


• Invention. You light up at hard problems and are creative at finding solutions. You experiment, get your hands dirty, and land things. You hold very high standards and always look for ways to improve.


• Team-oriented. You're someone others can count on. You support the best idea even when it's not yours, disagree productively, give and take feedback, share credit, and take on unglamorous work when that's what the team needs.

The craft bar for this role

Strong TypeScript and deep React knowledge, with a track record of shipping polished production frontends. You treat developer experience as a product surface, not an afterthought.

Where you might be strong

We're early, and nobody is strong in all of these - we don't expect you to be. Depth in two or three, plus curiosity about the rest, is what wins.

• SDK, API, or developer-platform design with real attention to DX


• Rendering performance and Core Web Vitals


• Design systems and component architecture


• Streaming or real-time interfaces


• Edge delivery and distributed frontends


• Documentation, examples, and integration tooling

Bonus points

• Experience as an early engineer at a startup or fast-growing company


• Open-source components, libraries, or SDKs


• AI-driven or generative UI work

What we offer

We'll ask a lot of you, and we give a lot in return. We want Callimacus to be a place where talented, driven people flourish, and we take that commitment seriously. A few things you'll find (and there's more):

• A product that will light you up.


• An exceptional opportunity for growth.


• Top-of-the-Italian-market salary and equity.


• Amazing offices in the centre of Milan.


• Top-of-the-market health insurance.


• A welfare budget you decide how to spend.


• Gym, mental health, museums, courses, travel - whatever actually makes your life better.


• Genuinely good food all day.


• High-quality, restaurant-level meals, including breakfast, lunch, and all-day snacks.

One note before applying

We believe working side by side leads to faster progress, stronger ramp-up, and a culture built around community. For the next year we have decided to be in-person first. We've invested in making our workplace worth coming to, and we're happy to support your commuting. And we don't work by tickets: priorities get redefined often, sometimes mid-week, and you'll need to be comfortable with that. If you're set on remote or on a settled roadmap, this isn't your role. If you want to be in the room while the platform takes shape, we'd like to meet you.

Location

On-site, central Milan (Moscova area)

Stack

TypeScript, React, Node.Js, AWS

Experience

4-6 years (Mid) or 6+ years (Senior)

Gross annual salary

€45-55k (Mid) / €55-65k (Senior), plus equity

Product Engineer, Experience (Frontend) Remote, italia, Italy