Ruby Labs

• Design, build, and maintain MCP servers and MCP-based integrations • Implement MCP tools, resources, prompts, and backend interfaces • Build reliable communication between AI agents, tools, and backend systems • Define clean contracts for MCP tools and services • Improve the stability, predictability, and maintainability of MCP infrastructure • Test MCP tool behavior across different usage scenarios • Monitor and improve the quality of AI-tool interactions • Build and maintain backend services using TypeScript and Node.js • Work with backend frameworks such as Hono, Fastify, NestJS, and Next.js backend/API routes • Implement REST APIs, internal endpoints, service-to-service integrations, and automation flows • Work with authentication, request validation, error handling, logging, and observability • Design clean, maintainable backend architecture for internal and production-facing systems • Write production-quality code with clear structure and good error handling • Build and deploy backend services on Cloudflare Workers • Work with edge runtime limitations and best practices • Design lightweight, performant services for edge/serverless environments • Debug issues related to worker execution, routing, request handling, and deployment • Use Cloudflare services when needed, such as KV, Durable Objects, Queues, R2, or D1 • Optimize backend services for performance, reliability, and cost efficiency • Build AI-powered workflows and internal automation tools • Design prompts, system instructions, and tool definitions for reliable AI behavior • Improve the quality, consistency, and predictability of AI outputs • Analyze AI workflow failures and improve prompts, context, or tool contracts • Structure data and context for better LLM performance • Build testable AI workflows that can be evaluated and improved over time • Work with LLM APIs such as OpenAI, Anthropic, Claude, or similar providers • Build integrations between internal systems, APIs, and AI tools • Automate repetitive operational or engineering workflows • Design backend flows that connect AI agents with real business systems • Ensure integrations are secure, observable, and maintainable • Build internal utilities and developer tools when needed • Investigate and fix issues across MCP servers, backend services, Cloudflare Workers, AI workflows, and API integrations • Improve logging, monitoring, and observability for AI/backend systems • Identify root causes of unreliable tool behavior or incorrect AI outputs • Make systems easier to debug, test, and maintain • Document technical decisions and implementation details clearly

• Participate in the solution development and maintenance of high-performance backend services and applications using Golang. • Architect, implement, and optimize microservices-based applications, ensuring scalability, reliability, and maintainability. • Collaborate with the DevOps team to deploy and manage Golang applications in Kubernetes clusters using Helm for efficient package management. • Design and optimize database schemas, queries, and transactions, specifically using Postgres. Ensure data integrity, performance, and scalability. • Develop and enhance the billing system to ensure accurate and timely processing of financial transactions. • Conduct code reviews to ensure code quality, best practices, and adherence to coding standards. • Collaborate within the cross-functional team, including DevOps, Backend and Frontend developers, QA and product management to understand requirements and deliver high-quality software solutions. • Maintain comprehensive documentation for code, architecture, and processes to facilitate knowledge transfer and onboarding of team members. • Ensure decent Unit test coverage of the applications and participate in keeping the autotest suite up-to-date.

• Daily Product Command — Own every phase of the mobile product lifecycle on iOS and Android. • Product Backlog Management — Maintain a refined, prioritized backlog of features, bugs, and improvements. • Feature Discovery & Delivery — Lead ideation, research, competitive benchmarking, and on-time feature delivery. • UI/UX Perfection — Enforce pixel-perfect mobile design standards and catch micro-alignment issues across devices. • Mobile UX Research — Keep ongoing competitor intelligence and UX research updates, studying top-performing apps. • App Store Optimization (ASO) — Optimize app store presence: descriptions, screenshots, keywords, ratings, and reviews. • Post-Production Control — Monitor releases in real time and resolve issues immediately post-deployment. • Product Events & Monitoring — Set thresholds, alerts, and proactive monitoring for crashes, ANRs, and performance anomalies. • Push Notification Strategy — Own roadmap, testing, segmentation, and optimization to maximize engagement. • Mobile Performance Optimization — Ensure benchmarks for load times, battery, memory usage, and app size. • In-App User Flows — Design and optimize onboarding, paywalls, subscription flows, and core user journeys. • Mixpanel Execution — Track metrics, funnels, heatmaps, and session replays to guide backlog priorities. • Platform-Specific Considerations — Deliver native-feeling experiences within iOS and Android guidelines. • Version Release Management — Coordinate submissions, rollouts, phased releases, and rollback strategies. • Twice-Daily Feedback Loops — Provide detailed feedback to dev and data teams at least twice daily. • Team Coordination — Facilitate daily action items for the Product Owner, QA, Dev, and Data teams.

Role Description We are seeking a Junior User Acquisition Manager to join our growing team and help drive subscriptions through web funnels within a single project. The ideal candidate should have approximately one year of hands-on experience with at least one advertising platform (e.g., Meta, TikTok, Snapchat, Pinterest ). The core focus of this role will be within the Meta ecosystem , including: - Running creative tests - Launching localized campaigns - Testing different buying strategies to improve performance Key Responsibilities - Campaign Management: Run and optimize paid social campaigns (primarily Meta), monitor performance, and make data-driven adjustments to hit targets (CPA, ROAS). - Testing & Optimization: Run tests on creatives, targeting, bidding strategies, geos, audiences, etc., to improve performance and find scaling opportunities. - Creative Collaboration: Work with the creative team to iterate on ad creatives, test different formats and messages, and share structured performance feedback. - Data & Insights: Analyze campaign metrics and work with the data team to turn insights into actionable optimizations. - Cross-team Collaboration: Partner with creative, data, product, and marketing teams to ensure aligned and effective user acquisition efforts. Qualifications - 1+ years in Digital Marketing or User Acquisition - Hands-on experience with at least one major advertising platform ( Meta, Google, TikTok, Snapchat ) - Ability to analyze performance data and make optimization decisions - Solid understanding of key marketing metrics ( CPA, ROAS , etc.) and unit economics - Strong English communication skills, with the ability to clearly present insights, performance results, and recommendations Location Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours. Benefits - Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance. - Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days. - Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge. - Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them. - Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here . Interview Process After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps: - Recruiter Screening (40 minutes) - Technical Interview (60 minutes) Life at Ruby Labs At Ruby Labs, we move fast, aim high, and expect the same from our team. We’re not here to play small—we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day. This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen. Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.

• Build, ship, and iterate on core product features across the stack. • Take ownership of features assigned to you — from implementation through production rollout and iteration. • Implement responsive, accessible UIs using TypeScript, TailwindCSS, and established design systems. • Work with backend services and APIs, integrating frontend logic with scalable systems. • Participate actively in code reviews and contribute to maintaining high engineering standards. • Debug, optimize, and improve production systems in a high-traffic environment. • Communicate blockers, risks, and progress early and clearly. • Work closely with Product and the rest of the engineering team to support fast, iterative delivery.

• Take ownership of core product components from concept to deployment. • Collaborate with the Product team to design scalable and maintainable architectures. • Participate in (and lead) code reviews and ensure best practices across the team. • Mentor junior and mid-level developers, providing guidance and fostering growth. • Contribute to hiring and onboarding new team members. • Maintain high code quality and application performance in a fast-paced, high-traffic environment. • Set up and improve CI/CD pipelines and development workflows. • Monitor, debug, and improve the stability and scalability of the system. • Help shape the engineering culture as the team grows.

• Take full ownership of UX, design quality, and user journeys across the product. • Turn UX into a measurable growth lever — directly improving activation, retention, and conversion. • Work closely with Product and Growth to design and optimize funnels, onboarding, paywalls, and retention loops. • Audit and continuously improve the end-to-end user journey — from acquisition through long-term retention. • Analyze product analytics independently — Mixpanel funnels, cohort analysis, retention curves, drop-off patterns. • Connect UX decisions directly to business metrics — activation rate, retention curves, LTV, conversion. • Define hypotheses, experiments, and success metrics for every UX initiative. • Use session recordings (Clarity, FullStory, Hotjar), heatmaps, and behavioral data to identify friction points. • Proactively request and define new analytics instrumentation and reporting needs with the data team. • Validate UX changes through A/B testing (GrowthBook or similar) — hypothesis, implementation, result analysis. • Define, enforce, and evolve a clear, scalable design system (implemented directly in frontend, not Figma-first). • Lead and direct designers and frontend engineers involved in UI/UX work — set the definition of done. • Set the visual and interaction quality bar across the product. • Establish a structured research practice — define priorities, run interviews, surveys, and usability tests. • Translate raw research into prioritized, actionable product decisions. • Direct and level up the existing UX researcher on the team — provide structure, frameworks, and clear priorities.

• Source and download official forms (tax, legal, administrative, business) across multiple countries. • Prepare and format them into clean, fillable PDF forms in Adobe Acrobat — proper field types, alignment, tab order, validations, and styling. • Ensure forms render correctly across desktop and mobile, and behave consistently in our editor. • Audit existing forms and continuously improve quality, fillability, and consistency. • Build and maintain modular content blocks, clauses, and conditional logic in our CMS (Payload) that power our agreement generation flows. • Translate legal and product requirements into structured content models — fields, collections, relationships, conditional rules. • Manage versioning, taxonomy, and metadata across the content library. • Coordinate with engineering when content models or integrations need updating. • Maintain a clean, well-organized library of forms and templates — proper categories, metadata, and discoverability. • Collaborate with the legal content team to ensure agreement templates are accurate, modular, and scalable. • Help prioritize new forms and templates based on market demand and product priorities. • Use AI tools to accelerate content prep, formatting, and CMS operations wherever possible.

• Partner with Product Owners and Data Teams across marketing, billing, and product domains. • Create new dashboards, maintain and improve existing reports such as Product Reports. • User behavior analysis, aha moment analysis. • Analyse data to generate actionable insights, find trends, patterns and provide recommendations to maximize KPIs. • Design and conduct A/B tests and homogeneity tests to validate hypotheses and measure impact. • Monitor metrics across all domains. • Design and build robust data models in SQL. • Give and receive actionable feedback to and from peers and the Leadership Team.

Role Description We're seeking a Senior Google User Acquisition Manager to join one of Ruby Labs' fastest-growing companies. The ideal candidate has 4+ years of hands-on Google Ads experience across Search, PMax, YouTube, and Display. You'll take full ownership of ad accounts, manage 6-figure monthly budgets, and make independent, data-driven decisions. If you're motivated by big budgets, ambitious targets, and continuous growth in a high-performance environment - this role is for you. Key Responsibilities - Own and optimize Google Ads campaigns (Search, PMax, YouTube, Display) - managing 6-figure monthly budgets with full accountability for performance and scaling. - Provide a clear operational structure for running and scaling campaigns across multiple regions worldwide. - Collaborate with the creative team on ad concepts and messaging, providing actionable feedback based on performance data. - Run structured tests to identify winning creatives, keywords, audiences, and bidding strategies. - Work closely with the data team to leverage reports, attribution models, and insights effectively. - Demonstrate ownership and proactivity by identifying growth opportunities and driving sustainable increases in spend and ROI. Qualifications - Minimum 4 years of hands-on experience managing Google Ads campaigns across Search, PMax, YouTube, and Display, with proven ability to scale $500k+ monthly budgets efficiently while maintaining strong ROI. - Experience running and scaling campaigns across multiple countries and regions. - Advanced analytical mindset with solid proficiency in Google Analytics 4, Looker Studio, Tableau, MixPanel, or similar tools, and the ability to build custom performance analyses and frameworks. - Deep understanding of Google Ads account structures, keyword strategy, audience targeting, Smart Bidding strategies, conversion tracking, and creative testing methodologies. - Self-driven professional who takes full ownership, thrives in fast-paced environments, and is strongly motivated to experiment, scale, and continuously improve long-term performance. - Strong English communication skills, with the ability to clearly present insights, performance results, and recommendations to stakeholders. Nice to have - Experience automating Google Ads workflows using scripts, rules, or AI-powered tools. Location Hint operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours. Benefits - Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance. - Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days. - Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge. - Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them. - Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Interview Process After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps: - Recruiter Screening (40 minutes) - Technical Interview (60 minutes) Life at Hint At Hint, we move fast, aim high, and expect the same from our team. We’re not here to play small—we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day. This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Hint offers the platform to make it happen. Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.