Jobs

Delasport — Implementing Technological Solutions Here and Now
Delasport is an iGaming Software company providing Sports Betting & Online Casino software, and turnkey B2B solutions. Established in 2010, Delasport delivers a one-stop-shop solution of Sports Betting and Online Casino from a White-Label, with a full range of management services to a Plug&Play iFrame and a complete Turnkey. We are establishing an R&D centre in Kyiv, and are looking for top talents to join our team.

RESPONSIBILITIES

• Act as a Product Owner
• Work closely with stakeholders to identify product needs and translate them into clear product requirements
• Represent and advocate product vision within the team and facilitate product processes
• Backlog management, iteration planning, and elaboration of the user stories. Create and groom short, medium, and long-term product roadmaps and get internal agreement with business stakeholders and provide visibility across the teams (IT and Business)
• Collaborate with the Scrum Masters to run successful release planning and sprint planning sessions, as well as sprint reviews and retrospectives
• Ensure the product functionality is properly documented
• Ensure a good communication and training strategy on the released features
• Proactively resolve business users satisfaction issues
   

REQUIREMENTS

• Proven experience as a Product Owner/Manager
• Experience in the casino domain
• Ability to produce detailed and clear User Stories, PRDs, and create mockups
• Visual modeling and diagram skills
• Proficiency in English (spoken and written)
• Strong leadership, communication, analytical and problem-solving skills
   

WHAT WE CAN OFFER YOU

• Modern office in Podil with an uninterruptible power supply and the Internet
• Personal time off (21 business days of paid vacation, paid days on special occasions, sick leaves, emergency days off)
• Public holidays
• Health and life insurance with our broker, available starting from the month following the employee’s start date with the company
• Modern technical equipment
• English courses with native speakers
• Ukraine-based educational programs
• Sports activities reimbursement
• Corporate entertainments
• Happy hours on Fridays
• Gig contract support

Delasport is an iGaming Software company providing Sports Betting & Online Casino software, and turnkey B2B solutions. Established in 2010, Delasport delivers a one-stop-shop solution of Sports Betting and Online Casino from a White-Label, with a full range of management services to a Plug&Play iFrame and a complete Turnkey. We are establishing an R&D centre in Kyiv, and are looking for top talents to join our team.
 

As a Senior PHP Engineer, you will dive into the complex but rewarding world of Sports and Online gaming, integrations, real-time calculation, scrapping data, and reporting, all at a massive scale.
 

TECHNOLOGY STACK: PHP 8, Symfony 6, Node.js, API REST, MongoDB, MySQL, Kafka, Docker, Kubernetes
 

RESPONSIBILITIES

• Participate in the design and decision-making of technical solution implementation
• Troubleshoot, analyze, provide workarounds and resolve various software problems
• Mentor and train new team members
   

REQUIREMENTS

• 5+ years experience in web application development
• Advanced architecture understanding both on theoretical and practical levels
• Deep knowledge of PHP programming
• Working experience with the Symfony framework
• Knowledge of the entire web stack and how each part impacts performance and reliability
• Exhaustive knowledge of database design and implementation
• Design and business insight
• Commitment to quality, performance, continuous improvement, and efficiency
• Analytical mindset and good problem-solving skills
• Experience in taking ownership
• Upper-intermediate level of English
   

NICE TO HAVE

• Gaming and sports industry experience
• NodeJS, Redis
• Experience in web application security and performance tune-up
• ELK, Kibana
   

WHAT WE CAN OFFER YOU

• Modern office in Podil with an uninterruptible power supply and the Internet
• Personal time off (21 business days of paid vacation, paid days on special occasions, sick leaves, emergency days off)
• Public holidays
• Health and life insurance with our broker, available starting from the month following the employee’s start date with the company
• Modern technical equipment
• English courses with native speakers
• Ukraine-based educational programs
• Sports activities reimbursement
• Corporate entertainments
• Happy hours on Fridays
• Gig contract support

Delasport — Implementing Technological Solutions Here and Now

Delasport is an iGaming software company providing Sports Betting & Online Casino software and turnkey B2B solutions. Since 2010, we have made a significant impact on the industry, earning awards and expanding our global presence. With offices in Bulgaria, Ukraine, and Malta, our team of more than 500 experts continues to drive innovation and strive for excellence. We are looking for top talent to join our R&D center in Kyiv.
 

RESPONSIBILITIES

• Manage and maintain our cloud infrastructure on Google Cloud Platform (GCP) to ensure high availability, scalability, and security
• Design, build, and manage containerized environments using Kubernetes for deploying and orchestrating microservices
• Collaborate with software development teams to streamline the CI/CD pipeline and implement automated build, test, and deployment processes
• Develop and maintain infrastructure as code (IaC) using Terraform to automate the provisioning and configuration of cloud resources
• Implement and manage configuration management tools such as Ansible to ensure consistent and efficient deployment across environments
• Monitor system performance and identify potential bottlenecks, taking proactive measures to optimize and improve overall system reliability
• Troubleshoot and resolve issues related to infrastructure, applications, and deployments in a timely manner
• Participate in the on-call rotation with the DevOps team, responding to alerts and incidents outside of regular business hours

• Stay up-to-date with the latest industry trends and best practices related to DevOps, cloud computing, and containerization
   

  REQUIREMENTS

• Bachelor’s degree in Computer Science, Engineering, or a related technical field
• Resilient and flexible mindset, open to changing priorities and adapting to new challenges and technologies as the business evolves
• 3+ years of experience as a DevOps Engineer or similar role with hands-on experience in Google Cloud Platform (GCP)
  Strong knowledge of containerization technologies, particularly Kubernetes, and experience managing containerized environments
• Proficiency in infrastructure automation using Terraform to provision cloud resources.
  Strong knowledge of configuration management tools, such as Ansible
• Solid understanding of CI/CD concepts and experience implementing CI/CD pipelines
• Familiarity with version control systems (e.g., Git) and their integration with CI/CD pipelines
• Strong knowledge of scripting languages (e.g., Bash, Python) for automation tasks
• Experience with monitoring and logging tools to ensure the health and performance of systems
• Strong problem-solving skills and the ability to work effectively in a team-oriented, collaborative environment
• Upper-Intermediate English level
  
  WHAT WE CAN OFFER YOU
• Modern office in Podil with an uninterruptible power supply and the Internet
• Personal time off (21 business days of paid vacation, paid days on special occasions, sick leaves, emergency days off)
• Public holidays
• Health and life insurance with our broker, available starting from the month following the employee’s start date with the company
• Modern technical equipment
• English courses with native speakers
• Ukraine-based educational programs
• Sports activities reimbursement
• Corporate entertainments
• Happy hours on Fridays
• Gig contract support

At Whitechain, we’re on a mission to revolutionize blockchain, smart contracts, and cryptography. As part of the WhiteBIT ecosystem, we’re building cutting-edge Web3 solutions, from our own EVM blockchain to non-custodial wallets, DeFi platforms, and GameFi experiences.

We’re looking for a skilled and motivated Blockchain / Web3 Developer to help us design, build, and improve scalable blockchain products and infrastructure. If you’re passionate about decentralization, smart contracts, EVM ecosystems, and the future of digital finance, this is your opportunity to make a real impact.

The future of Web3 starts with you — join us as a Blockchain / Web3 Developer!

Requirements

• 3+ years of software development experience
• 1–2+ years of experience in blockchain, Web3, crypto, or DeFi projects
• Strong experience with Solidity and smart contract development in the EVM ecosystem
• Good understanding of Ethereum / EVM architecture, gas optimization, token standards, and smart contract security
• Experience with Web3 tools such as Hardhat, Foundry, Remix, MetaMask, Ethers.js, Web3.js, Viem
• Experience deploying and maintaining smart contracts on testnet and mainnet
• Knowledge of DeFi: AMMs, staking, lending, bridges, oracles, stablecoins, and liquidity pools
• Backend integration experience: APIs, indexers, event listeners, wallets, or transaction services
• Understanding of common blockchain security risks
• Experience with JavaScript, TypeScript, Python, Node.js, or similar backend technologies
• Familiarity with Git, CI/CD, testing frameworks, code reviews, and documentation
• English level B2+

Responsibilities

• Design, develop, test, and deploy smart contracts for Whitechain and Web3 products
• Build blockchain features for DeFi platforms, wallets, GameFi, and ecosystem tools
• Write secure and gas-efficient Solidity code
• Create unit tests, integration tests, and deployment scripts
• Integrate smart contracts with backend services, frontend apps, wallets, APIs, and blockchain infrastructure
• Review existing smart contract code and suggest improvements
• Support audits, security reviews, and vulnerability remediation
• Monitor deployed contracts and help resolve production issues
• Research new blockchain protocols, DeFi mechanics, and EVM improvements
• Contribute to technical documentation and best practices

Nice to Have

• Experience with L1 / L2, rollups, bridges, validators, nodes, or RPC infrastructure
• Experience with audit tools such as Slither, Mythril, Echidna, Tenderly, or OpenZeppelin Defender
• Knowledge of The Graph, SubQuery, custom indexers, or blockchain analytics pipelines
• Experience with account abstraction, cross-chain protocols, or oracle integrations
• Open-source Web3 contributions or a public GitHub portfolio
• Understanding of tokenomics, staking, governance, or protocol economics
• Experience in fintech, crypto exchange, DeFi, wallet, or Web3 infrastructure companies

If you are passionate about Solidity, EVM, DeFi, and building reliable Web3 products, we would be happy to hear from you.

About us:
 

BetterMe — a global wellness ecosystem empowering millions to become better — physically, mentally, and emotionally. We build what makes people better and keep challenging ourselves to inspire others.
 

Your impact:

• Execute, manage, and optimize large-scale advertising campaigns across Google Ads.
• Develop and implement effective user acquisition strategies focused on performance and scalability.
• Conduct in-depth keyword, audience, and competitor research to identify growth opportunities.
• Manage campaign budgets, bidding strategies, and performance optimization to maximize ROI and business impact.
• Analyze campaign performance, identify trends, and proactively drive improvements based on data insights.
• Collaborate cross-functionally with creative, analytics, and product teams to improve campaign efficiency and performance.
• Optimize and automate routine processes to improve operational effectiveness and scalability.

About you:

• 4+ years of hands-on experience managing and optimizing Google Ads campaigns.
• Strong knowledge of Google Analytics, Google Ads metrics, attribution models, and performance analysis.
• Proven experience working with high-budget performance marketing campaigns.
• Experience with Facebook/Instagram Ads, DV360, Bing Ads, or other paid acquisition channels will be a strong plus.
• Intermediate+ level of English or higher.
• Strong analytical thinking, attention to detail, and a data-driven approach to decision-making.
• Results-oriented mindset with strong business and performance focus.
• Ability to work independently, prioritize effectively, and drive initiatives proactively.

What you get at BetterMe:
 

A mission that inspires. Every line of code, every design, every idea helps millions of people become healthier and more confident.
Trust without micromanagement. You manage your time and make decisions independently. We value outcomes, not online hours.
Growth opportunities. 90% of our leads have grown within the company. There’s space for initiative, new responsibilities, and real career upgrades.
Flexible work format. Choose what works best for you — office, remote, or hybrid.
Wellness in practice. Offline: workouts with professional trainers in our corporate gym, massage, corporate lunches, sports, and team activities — everything you need to recharge and reset together. Online: regular online workouts, partner discounts, and free access to our products.
Health insurance & corporate doctor.
Open communication. Transparency across teams, honest feedback, and support for initiatives are part of our everyday culture.
Support for sports events. We cover entry fees and encourage the team to compete and participate together.
Modern equipment. We provide new hardware and everything you need for productive work.
Legal & finance support. Experienced lawyers and financial specialists are always there to help — from documents to personal consultations.

We are looking for a Senior Data Engineer to work ona  modern data platform project focused on processing and enriching data from multiple external sources to support advanced analytics, ML workflows, and business decision-making.

We’re looking for someone with strong experience in:
• Python
• SQL
• Snowflake
• dbt
• Databricks / PySpark
• ETL/ELT pipelines
• Production-grade data systems
• ML / analytics-related data workflows

It’s a fully remote role within Europe or LATAM, with flexible working hours and long-term collaboration opportunities.

Akvelon works with clients such as Amazon, Reddit, Pinterest, Starbucks, LinkedIn, Intel, and many others, offering strong engineering culture, professional growth, certifications, workshops, and internal learning programs.

Would you be open to a quick chat to discuss the opportunity in more detail?

About us:

ARRISE sets the benchmark for service delivery and excellence in the iGaming industry. Playing a key role in the success of its clients, which include Pragmatic Play, a brand relied upon by the world’s biggest online casinos for its cutting-edge products, ARRISE helps to deliver exceptional gaming experiences to millions of players worldwide.

Our global team of talented and driven professionals are shaping the future of iGaming. Headquartered in Gibraltar, we have offices spanning Canada, India, the Isle of Man, Latvia, Malta, Romania, Serbia, Bulgaria, and the UAE, and more exciting destinations on the horizon.

At ARRISE, we take pride in creating growth opportunities at all levels, constantly investing in our people while welcoming new colleagues and forging strategic partnerships that open new opportunities for success. 

To achieve this, we bet on ourselves. We know that success is a collective effort, and our team is driven by ambition, collaboration, and a shared commitment to grow and succeed—while embracing every step of the journey.

Be part of the future of iGaming with ARRISERS! See a job that excites you? Apply now, and our friendly recruitment team will connect with you soon. Your journey starts here!
 

Requirements: 

• 5+ years of PostgreSQL, Pg/SQL development experience. 
• Oracle SQL, PL/SQLL development experience will be a big plus. 
• Shredding, changing and understanding older code without the need to know everything about a business process is imperative. 
• Query performance analyzing and tuning. 
• Experience with high loaded OLTP systems. 
• Experience with very large databases. 
• Experience with design, development, and maintenance of reporting and data warehouse databases a plus. 
• Experience with migrating schemas and data from Oracle to other RDBMS a plus. 
• Basic DB administration experience. 
• Familiarity with database design, documentation and coding. 
• Familiarity with programming languages API. 
• Problem solving skills and ability to think algorithmically. 
• Experience with Amazon Redshift, RDS, Aurora is a plus. 

General skills: 

• English (reading/writing/speaking) — min Intermediate level. 
• Experience in working with people. 
• Quick understanding and learning abilities. 
• Ability to work on several tasks in parallel. 

 
Responsibilities: 

• Responsible for designing, coding, and implementing software solutions using modern techniques and programming SQL language. 
• Provides high-level database development assistance in creating specific applications for businesses. 
• Provides general support on information technology to design, develop, execute, and maintain the database application systems, applying several RDBMS. 
• Ensures research and innovation at all levels of the software development process. 
  May participate in multiple projects simultaneously as a senior development team member. 
• Works harmoniously in a cross-functional team comprising managers, supervisors, business analysts, systems personnel, network staff, and other developers in ensuring the delivery of software solutions as planned, within set budget, and timely. 
• Acts as a coach or mentor to junior software developers. 
• Provides excellent customer service by responding to and assisting with help desk calls to resolving issues, including system outages. 

Company offers: 

• Long-term employment. 
• Flexible timetable. 
• Comfortable working conditions. 
• Paid vacation and sick leaves. 
• English lessons, gym. 
• Competitive salary level. 

About us:

ARRISE sets the benchmark for service delivery and excellence in the iGaming industry. Playing a key role in the success of its clients, which include Pragmatic Play, a brand relied upon by the world’s biggest online casinos for its cutting-edge products, ARRISE helps to deliver exceptional gaming experiences to millions of players worldwide. 

Our global team of over 6,000 talented and driven professionals are shaping the future of iGaming. Headquartered in Gibraltar, we have offices spanning Canada, India, the Isle of Man, Latvia, Malta, Romania, Serbia, Bulgaria, and the UAE, and more exciting destinations on the horizon. 

At ARRISE, we take pride in creating growth opportunities at all levels, constantly investing in our people while welcoming new colleagues and forging strategic partnerships that open new opportunities for success. 

To achieve this, we bet on ourselves. We know that success is a collective effort, and our team is driven by ambition, collaboration, and a shared commitment to grow and succeed—while embracing every step of the journey. 

Be part of the future of iGaming with 6,000 ARRISERS! See a job that excites you? Apply now, and our friendly recruitment team will connect with you soon. Your journey starts here!   

Requirements: 

• Requires 4 or more years of related experience, maintenance, and administration of PostgreSQL databases.   
• Previous SQL Server and/or Oracle database administration experience is a plus.  
• Strong writing and verbal communication skills.   
• Displays excellent collaborative skills with cross-functional teams.  

Responsibilities:  

• The DBA should have knowledge of some industry standard PostgreSQL databases including creation and implementation of fully functional PostgreSQL database clusters (both in the cloud AWS RDS and on-premises), ability to maintain multiple development, QA, and production PostgreSQL environments with experience in performance tuning.  
• Review existing configurations and installations and provide design decisions for improvements to platform environments.  
• Assist in planning and performing PostgreSQL database upgrades and migrations.  
• Perform production level support and be part of the on call rotation when required.  
• This position will be responsible for supporting new and existing PostgreSQL database systems, both internally and future Cloud managed instances and will contribute in defining best practices in database administration, and introduce innovation with automation.  
• Proficient with the Linux operating systems - Ubuntu, RHEL.  
• Assist in implementing long-term strategic goals for database development in conjunction with end users, managers, clients, and other stakeholders.   
• Perform debugging, tuning, and performance enhancement as well as automation of operational and continuous integration aspect of the PostgreSQL platform.  
• Independently analyzes, solves, and corrects issues in real time, providing problem resolution end-to-end.  

Company offers: 

• Long-term employment; 
• Flexible timetable; 
• Comfortable working conditions; 
• Paid vacation and sick leaves; 
• English lessons, gym; 
• Competitive salary level. 

Job Description

• Master’s degree in Computer Science, Data Science, Applied Mathematics, or a related field.
• 8+ years of professional experience in machine learning, data science, or AI engineering.
• Proven experience as a technical lead or solution architect for ML/AI projects, with accountability for end-to-end delivery in a production environment.
• Strong proficiency in Python and the modern ML/AI ecosystem (e.g., PyTorch, Hugging Face, LangChain/LangGraph, Scikit-learn).
• Hands-on experience with data ingestion, RAG pipeline optimization, model evaluation, deployment (MLOps), and monitoring.
• Deep understanding of generative AI (LLMs, embeddings, RAG, prompt engineering, and agentic reasoning) and its practical constraints (latency, cost, safety, hallucinations).
• Experience turning complex business needs into "machine-ready" technical specifications and acceptance criteria.
• Strong experience with major cloud platforms; hands-on knowledge of AWS (e.g., Amazon Bedrock, SageMaker) or GCP (e.g., Vertex AI) is highly desirable.
• Evidence of using modern GenAI tools (Claude Code, GitHub Copilot, etc.) to significantly accelerate your development and testing process.

Job Responsibilities

Advanced Recommendation Modeling: Design and deploy recommendation algorithms that account for time-decay, breaking news signals, and short-term user intent, distinguishing them from long-term preference models used in streaming.
Generative AI Integration: Lead the development and integration of Gen AI and LLM-based models to enhance content summarization, semantic search, and personalized news briefings.
Signal Processing: Engineer complex feature sets that weigh recency, topic sensitivity, and contextual relevance (e.g., differentiating between a user following a specific stock ticker vs. a general sector interest).
Model Lifecycle Management: Own the end-to-end lifecycle of ML models, from hypothesis and training to A/B testing, deployment, and monitoring in a high

We’re currently looking for a Product Manager to join the product SaaS team at G-MOS — a product from the Promodo ecosystem.

G-MOS is a SaaS platform that helps businesses scale Google Ads through automation and smart product workflows. We’re looking for a Product Manager with hands-on PPC experience who wants to build next-generation products for performance marketers and e-commerce businesses.

Must-have qualifications:

• 2+ years of experience in Product Management
• Hands-on PPC experience: Google Ads — must; Meta Ads, Amazon Ads, Bol.com Ads — nice to have
• Strong experience in product roadmapping and planning, including defining product vision and aligning it with business goals
• Proven skills in backlog management and prioritization, ensuring clarity, focus, and value-driven delivery
• Hands-on experience across the full product lifecycle, from product discovery and validation to delivery and launch
• Excellent stakeholder communication skills, with the ability to align expectations and collaborate effectively across teams
• English B2+ (spoken & written)
• Strong desire to build next-generation products
• Interest in AI: you regularly test new AI features and tools and understand where they add value

This role is a great match if you:

• Understand how PPC specialists work and think
• Can translate business and user needs into clear product solutions
• Care about usability, scalability, and measurable impact
• You’re comfortable working in a fast-growing, product-driven SaaS team

Key responsibilities:

• Work closely with the development team, marketing, and CEO
• Run customer development (custdev) interviews and gather continuous feedback
• Conduct market and competitive research
• Define and own the product roadmap and backlog
• Write clear product requirements (PRDs, user stories, acceptance criteria)
• Build new features and optimize existing workflows, including AI-powered ones
• Improve the current product UX in collaboration with design and development
• Contribute to and evolve the long-term product development vision

What we offer:

• fully remote setup: Monday-Friday, 9:00/10:00-18:00/19:00 (Kyiv time);
• work with a SaaS product in the active scaling phase, with proven product — market fit and a clear value proposition for customers;
• fast professional growth opportunities;
• close collaboration with a strong, experienced team, where your ideas and initiatives genuinely shape processes;
• timely and transparent compensation;
• paid vacation and sick leave — we support a healthy work—life balance and believe that rest and recovery are just as important as results.

Apply now and join the team!

We are looking for a Senior Full-Stack Software Engineer to join a long-term AI-focused product project for an international client.

This opportunity is ideal for engineers who enjoy building modern cloud-native applications and working with AI-driven systems, LLM integrations, and agentic workflows.

Tech Stack

• TypeScript
• Node.js
• React / Next.js
• Google Cloud Platform (GCP)
• AI/LLM-integrated systems
• Agentic harness / AI agents orchestration

Responsibilities

• Build and scale full-stack applications using TypeScript
• Develop backend services, APIs, and frontend features
• Work with cloud infrastructure and services on Google Cloud
• Contribute to architecture and technical decision-making
• Collaborate with distributed engineering and product teams
• Participate in development of AI-powered workflows and automation systems

Requirements

• Strong commercial experience with TypeScript and Node.js
• Solid full-stack engineering background
• Experience with modern frontend frameworks
• Hands-on experience with cloud platforms, preferably GCP
• Ability to own features end-to-end
• Strong system design and problem-solving skills
• Experience with AI/LLM products is a strong plus
• Startup or product-company experience is nice to have

At Whitechain, we’re on a mission to revolutionize blockchain, smart contracts, and cryptography. As part of the WhiteBIT ecosystem, we’re building cutting-edge Web3 solutions, from our own EVM blockchain to non-custodial wallets, DeFi platforms, and GameFi experiences.

We’re looking for someone with:

• 3+ years of software development experience
• 1–2+ years in blockchain, Web3, crypto, or DeFi
• Strong Solidity and EVM smart contract experience
• Hands-on experience with tools like Hardhat, Foundry, Ethers.js, Web3.js, Viem, MetaMask, or Remix
• Good understanding of DeFi, smart contract security, gas optimization, and backend blockchain integrations
• English level B2 or higher

Nice to have:

• Experience with L1/L2, bridges, validators, nodes, RPC infrastructure, audits, or Web3 security tools
• Backend experience with Node.js, TypeScript, Go, Rust, Python, or Java
• Open-source Web3 contributions or a public GitHub portfolio

The position is fully remote, with modern equipment, paid leave, growth opportunities, and the chance to work on Whitechain and WhiteBIT ecosystem products.

✉️ Senior Frontend Engineer (AI-first role) | Remote (Europe) | B2B only

We are currently hiring a Senior Frontend Engineer for a trading / fintech product company working on a high-traffic, production-grade marketing platform serving multiple global locales.

This is a fully remote, Europe-based, B2B contract role only.

🚀 About the role

You will take full ownership of a mature frontend ecosystem built with:

Next.js (App Router), React 19, TypeScript, headless WordPress, and a custom Gutenberg block rendering engine.

The platform supports 30+ locales, real-time market data, and multiple third-party integrations across marketing, CRM, analytics, and personalization tools.

This is a high-responsibility engineering role, not greenfield — you will improve, scale, and optimize an existing architecture used at global traffic level.

🤖 AI-first engineering (core requirement)

This role is designed around AI-native development workflows.

You must be experienced in:

Agentic IDEs (Cursor, Claude Code, Windsurf or similar)
AI-driven multi-file refactoring and feature scaffolding
Context engineering (CLAUDE.md / AGENTS.md / rules for large codebases)
AI-assisted component generation (including Gutenberg block → React mapping)
AI-supported testing (Vitest + RTL with human-level validation)
Ability to detect and reject incorrect or hallucinated AI outputs

👉 Candidates who do not actively use AI as a core part of their workflow will not be considered.

🧩 Key responsibilities
Own frontend architecture, performance, and scalability
Work with headless WordPress + Gutenberg block system
Build multi-locale routing (next-intl, domain-based structure)
Integrate real-time market data via WebSockets / SignalR
Manage third-party integrations (GTM, CRM, analytics, personalization tools)
Ensure Core Web Vitals, SEO, and performance optimization
Work with CI/CD pipelines (Azure DevOps, Docker, AWS ECR)
Maintain design system consistency (Figma → code, tokens, Tailwind)
Write and maintain tests (Vitest, Testing Library)
🧠 Must have
5+ years frontend experience
Strong Next.js (App Router, SSR, ISR, RSC)
Advanced TypeScript in large-scale projects
Experience with headless WordPress + REST API
Multi-locale / i18n architecture experience
SWR for data fetching
WebSockets / real-time data handling
Strong understanding of SEO + Core Web Vitals
Experience working with design systems (no ad-hoc styling)
🌍 Location & contract
Europe-based candidates only
Fully remote
B2B contract only
📩 Apply / contact

About us

Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/

About the role

At RubyLabs, we’re seeking a senior AI Engineer (Node.js / Next.js / TypeScript) to shape our AI infrastructure and drive production-ready LLM experiences. You’ll work in a modern stack, making data-driven decisions around model performance, reliability, and cost.

You’ll own advanced prompt systems, structured outputs, and complex LLM workflows using LangChain or LlamaIndex. Observability, debugging, and evaluation are core to the role, leveraging Langfuse and AI gateways like OpenRouter to continuously improve model quality and operational efficiency. You’ll take full ownership of key AI features from experimentation to live production.

Key Responsibilities

• Advanced Prompt Engineering: Designing complex, dynamic prompt templates with conditional logic and efficiently reusing information and context within prompts to maximize generation quality and reasoning.
• Structured Outputs & Schemas: Implementing various response schemes (JSON mode, function calling, Zod/JSON schemas) to ensure AI outputs are predictable and ready for seamless integration into application logic.
• Prompt Engineering & Evaluations: Building robust evaluation pipelines and using Langfuse to collect feedback and score the quality of responses in real time.
• Tracing & Debugging: Performing deep debugging of complex LLM chains using Langfuse traces to identify bottlenecks and optimize for cost, latency, and context window usage.
• AI A/B Testing: Running systematic experiments across different models via OpenRouter (e.g., comparing Claude 3.5 Sonnet vs. GPT-4o) and analyzing results based on quantitative metrics.
• Data-Driven Decisions: Making deployment decisions for new prompts or models strictly based on quantitative benchmarks and trace data, rather than intuition.
• Output Scoring & Analysis: Developing scoring systems to analyze the “Problem → Solution” chain and identify root causes of hallucinations or logic errors using Langfuse analytics.
• Model Performance & Fine-Tuning: Regularly re-evaluating model performance as new architectures emerge and performing fine-tuning when necessary to meet specific domain requirements.

Qualifications

• Node.js & Next.js: Deep knowledge of the stack to build reliable services and handle complex LLM-generated data.
• Dynamic Prompting Skills: Proven experience in building prompts where content is highly dependent on input variables and context injection.
• OpenRouter Experience: Experience working with unified APIs, managing rate limits, and selecting the most cost-effective models for specific tasks.
• Langfuse (or similar): Understanding of LLM observability principles — setting up tracing, creating test datasets, and integrating scoring systems.
• Evaluation Methodology: Experience with frameworks like RAGAS or building custom “LLM-as-a-judge” systems.
• Analytical Mindset: Ability to transform raw generation logs into actionable business metrics and technical insights.
• Iterative Mindset: Focus on continuous product improvement through constant feedback loops.

Nice to have

• Fine-Tuning: Practical experience in fine-tuning models for specific domain tasks or JSON compliance.
• RAG Architecture: Understanding how to build and optimize Retrieval-Augmented Generation systems, including indexing, retrieval, and re-ranking.
• Python: Basic knowledge for working with data science scripts or AI evaluation libraries.

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

Discover the perks of being part of our vibrant team! We offer:

• 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: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt

Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!

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)
• Final Interview (30 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.

Main requirements

• 5+ years of experience working with Adroid/Kotlin
• Jetpack Media3 and ExoPlayer expertise for at least 1 year
• Audio Streaming experience on Android for at least 1 year

Requirements

Position name: Senior Android/Kotlin Developer
Level: Senior
Hard skills requirements (including years):

• Jetpack Media3 and ExoPlayer expertise
• Audio streaming via Media3 (remote URL handling)
• MediaSessionService implementation for background tasks
• Audio Focus management (AudioFocusRequest)
• Foreground Service configuration (mediaPlayback type)
• MediaStyle notification integration
• System Media Controls and Lock Screen integration
• Kotlin Coroutines and Flow for async API calls
• SimpleCache implementation for audio persistence
• LoadControl and buffering optimization
• Pre-fetching and lookahead caching logic
• AudioDeviceCallback and "becoming noisy" broadcast handling
• Android Keystore for secure credential storage
• Scoped Storage and Privacy Sandbox compliance
  
  Soft skills requirements:
  - Good communication skills
  - Proactive
  
  Office/Remote: Remote
  Project tasks:
  Implement an audio player component that fetches and plays a remote audio file via the API. Ensure the implementation handles loading states and basic playback controls within the existing UI.
  
  English level: Upper-Intermediate (B2+)