Careers — Riina

Founding Marketing Lead

RemoteFull-time

The role

We are looking for a Founding Marketing Lead to build the growth from an exciting beta product into our first 10k-users milestone. We need a highly hands-on marketer who can move between community building, brand storytelling, and experimentation. You would be the first marketing hire, joining a team of three experienced cofounders — remote, with the option to work from our Porto offices for in-person collaboration and team building.

What you’ll do

Refine Riina’s early marketing strategy in direct partnership with the founders.
Develop founder-led seeding, local partnerships, and grassroots growth experiments in Porto.
Build programs and test partnerships with coaches, athletes, creators, and credible sports voices.
Identify the most promising acquisition loops and create a clear measurement framework.
Create playbooks that can be repeated across similar communities and geographies.
Lead PR efforts around Riina’s narrative and build a recognizable public voice across channels.
Drive user-generated content strategy with a constant test-and-learn mindset.
Own Riina’s early marketing budget, using it as a strategic tool to learn fast and scale what works.
Help define what future marketing hires should look like as the team grows.
Work closely with product so the app experience and external messaging reinforce each other.
Own early monetization insights, including ad optimization and new revenue experiments.
Improve the in-app experience based on what drives activation, engagement, and repeat usage.

What we’re looking for

5+ years of experience in marketing or sales at a fitness or community-driven company.
Experience building and developing communities or partnerships.
Proven ability to build from zero, not just optimize mature channels.
Strong instinct for what makes people join, share, compete, and come back.
Experience designing AI-driven or data-rich product experiences.
Willingness to be deeply hands-on in the early days.
Fitness and wearable enthusiast.
English fluency. Portuguese is a bonus.

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Lead UI/UX Designer

RemoteFull-time

The role

We are looking for a Lead UI/UX Designer to help shape product experiences from the ground up. This is a hands-on role for someone who can combine strong visual taste with rigorous product thinking — designing flows, interfaces, systems, and interaction patterns that make Riina feel clear, competitive, motivating, and unmistakably on-brand. As the first product hire, you’ll have meaningful ownership and direct influence over how a new kind of social fitness platform looks and works, joining a team of three experienced cofounders — remote, with the option to work from our Porto offices.

What you’ll do

Lead UI/UX design across key parts of the Riina product, from concept to polished execution.
Drive the design process from initial concept to final handoff, balancing user and business objectives.
Create intuitive, accessible, and visually compelling interfaces.
Design wireframes, user flows, and high-fidelity prototypes to communicate design ideas.
Support user research and competitive analysis to gather insights that drive improvements.
Translate product strategy and user needs into elegant, high-performing mobile experiences.
Build and evolve a scalable design system aligned with Riina’s visual identity.
Partner closely with founders, product, and engineering to move quickly from idea to shipped product.
Simplify complex fitness and competition data into interfaces that are easy and motivating to use.
Balance usability with emotional impact — a product that feels both disciplined and energizing.

What we’re looking for

4+ years of experience in UI/UX or product design for digital products.
Fitness and wearable enthusiast (don’t apply if you’re not!).
Strong portfolio with relevant mobile app, consumer, social, or fitness design work.
Expert in design tools like Figma.
Comfort working in exploratory or 0→1 innovation environments, with strong collaboration skills.
Proven ability to design and deliver applications for both iOS and Android.
Strong command of information architecture, user flows, prototyping, and interface design.
Ability to create polished, modern consumer experiences with strong attention to detail.
Experience designing for mobile-first products.
Comfortable in a fast-moving startup environment with ambiguity and evolving priorities.
Able to defend design decisions with logic, user empathy, and product judgment.
English fluency.

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Fractional CMO

RemoteFull-time

The role

We are looking for a Fractional Chief Marketing Officer to help shape and execute Riina’s early go-to-market strategy. We need a hands-on, strategic operator who can move between positioning, launch strategy, growth loops, creator/community marketing, and early user acquisition. You will work directly with the founders to define how Riina goes from beta product to a strong public launch, with the first major milestone being 10,000 high-quality users.

What you’ll do

Refine Riina’s early marketing strategy in direct partnership with the founders.
Develop founder-led seeding, local partnerships, and grassroots growth experiments in Porto.
Build programs and test partnerships with coaches, athletes, creators, and credible sports voices.
Identify the most promising acquisition loops and create a clear measurement framework.
Create playbooks that can be repeated across similar communities and geographies.
Lead PR efforts around Riina’s narrative and build a recognizable public voice for Riina across channels.
Help define what future marketing hires should look like as the team grows.
Work closely with product to improve the app experience based on what drives activation, engagement, and repeat usage.

What we’re looking for

10+ years of marketing experience, with meaningful fitness, sports, or wearables companies.
Experience in strategic marketing roles, ideally as a director or VP, in startup environments.
Proven expertise in mobile user acquisition and growing community-led platforms.
Ability to work directly with founders and turn product vision into market-facing messaging.

Apply for this role

Don’t see your role? We’re always glad to meet great people — reach out at jobs@riina.io.

Help build Riina

Open roles

Founding Marketing Lead

The role

What you’ll do

What we’re looking for

Lead UI/UX Designer

The role

What you’ll do

What we’re looking for

Fractional CMO

The role

What you’ll do

What we’re looking for

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