Jobs at Djinni

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're a fast-growing tech company building modern, innovative digital products — and we're looking for a Full-Stack Developer to join our team in Lviv. If you're comfortable on both sides of the stack, enjoy owning features end-to-end, and want to work in a team that values engineering quality, we'd love to hear from you.

What you'll be doing

You'll work as part of a cross-functional team to build and maintain full-stack features — from crafting responsive, user-friendly interfaces to designing scalable server-side architecture and APIs. Our frontend stack includes React, Next.js, TypeScript, Redux, GraphQL, SCSS, Material-UI, and Webpack. On the backend, we work with Node.js, Express, NestJS, PostgreSQL, MongoDB, JWT, Socket.IO, AWS (DynamoDB, S3, EC2), Firebase, and Heroku. We also integrate with third-party services such as Twilio, SendGrid, Google Maps, MapBox, and WebRTC.

What we're looking for

Frontend

• Solid experience with React and modern React hooks
• Confident use of modern JavaScript (ES6+) and TypeScript
• Strong command of HTML5, CSS3, and SCSS
• Experience with Redux or other state management tools
• Ability to build responsive, cross-browser compatible layouts

Backend

• Solid hands-on experience with Node.js
• Practical experience with Express.js and/or NestJS
• Experience working with ORM tools
• Proficiency in SQL databases (MySQL / PostgreSQL) and NoSQL databases
• Experience designing RESTful APIs and integrating with third-party services

General

• Experience with Git and version control workflows
• Ability to work across the full product lifecycle — from feature design to deployment
• Responsible, self-motivated, and comfortable working both independently and as part of a team

What we offer

• Full-time, in-office position in Lviv
• Official employment and a competitive salary based on your skills and experience
• Company-provided equipment
• A well-structured work schedule
• A friendly, supportive team and a comfortable office environment
• Mentorship and guidance from experienced colleagues
• Interesting and technically challenging projects to grow on

How to apply

Send us your CV — we review every application and get back to candidates promptly. This could be the start of something great.

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. 

Project: Catering app

Key Details:
Duration: Full-time, starting ASAP, short term (1 month)

Context: Client wants to replace underperforming vendor's mobile developer. Project has ongoing dashboard work (6-person team) but needs dedicated developer for the new app component.

Next Steps: review estimations from client.

Tech Stack:

• Dart / Flutter
• Java / Kotlin (Android SDK)
• Swift / SwiftUI
• MVP
• SQLite / Room
• CircleCI / Jenkins
• GitHub Actions
• Web-sockets

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

Responsibilities

• Be a point of contact for Mid-tier viewers and broadcasters
• Qualify and acknowledge the issues Tango users report, and resolve them in a timely manner, via text communication channel (Intercom, no voice calls)
• Fulfill a workload of 15 tickets per hour with a 5 min first response time SLA
• Record the issues users are experiencing in a task tracking tool (JIRA)
• Gather feedback and propose improvements to user experience
• Achieving good results in personal KPIs and helping teammates do the same.

Requirements

• Prior experience in customer service (1+ years)
• Exceptional English (B2+) with professional tone in written communication
• A desperate urge to help and teach, ability to empathise with customers.
• Competent speech, the ability to make yourself understood
• A responsible team player

• Multi-tasker and performer able to show and report results

   

As a plus:

• Knowledge of additional languages (Arabic, Turkish, Spanish) will be a plus
• Prior experience with helpdesk systems (Zendesk, Intercom, etc) is a plus
• Experience with task tracking tools (Jira, YouTrack, Confluence) is a plus
• Prior experience and success as a live streaming broadcaster is a huge plus!

What we offer:

• International company with several offices in different locations: Tel-Aviv, Kyiv, Warsaw, Limassol.
• Granting an Option;
• A professional environment with great people to work with;
• Competitive salary, performance review;
• Flexible working hours, no one here tracks your work time because our culture is built on trust and cooperation;
• Social package, including sports coverage, elite medical insurance for you and family;
• 20 working days paid vacation and 100% sick leave coverage;
• Opportunities to make a difference, to develop and grow;
• Regular corporate celebrations, team building, and fun activities;
• Comfortable office close to the metro station. Our Kyiv office is open 24/7 with all safety and health measures in place.

Description:

We are the creators of a new fintech era!
Our mission is to change this world by making blockchain accessible to everyone in everyday life. WhiteBIT is a global team of over 1,200 professionals united by one mission — to shape the new world order in the Web3 era. Each of our employees is fully engaged in this transformative journey.
We work on our blockchain platform, providing maximum transparency and security for more than 8 million users worldwide. Our breakthrough solutions, incredible speed of adaptation to market challenges, and technological superiority are the strengths that take us beyond ordinary companies. Our official partners include the National Football Team of Ukraine, FC Barcelona, Lifecell, FACEIT and VISA.


The future of Web3 starts with you: join us as a Junior Talent Manager!

Requirements:

— Experience in preparing and structuring vacancy requirements;
— Understanding of role seniority levels and ability to differentiate between Junior, Middle, and Senior specialists based on responsibilities, skills, and expectations;
— Strong organizational and coordination skills;
— Ability to manage multiple processes simultaneously;
— Good communication skills and stakeholder management;
— Analytical thinking and attention to detail;
— Upper-Intermediate+ English level.

Responsibilities:

Talent Demand & Hiring Process:
— Collect and consolidate data on job openings from hiring managers
— Transfer job opening requests for salary analytics
— Gather and validate budget information for open positions from hiring managers
— Coordinate budget alignment with hiring managers based on salary analytics results
— Facilitate the approval process, ensuring all required approvals are obtained
— Monitor and update the status of job applications throughout the process

Internal Talent Search & Talent Pool:
— Work with the internal Talent Pool to identify relevant candidates for open positions
— Support internal search processes, including collecting applications and initial candidate communication
— Coordinate internal interview processes between candidates and hiring managers

Employee Rotations:
— Support or manage employee rotations within one or two departments
— Identify potential internal opportunities aligned with employee profiles
— Coordinate communication between employees and managers during rotation processes
— Ensure smooth execution of rotations in successful cases
— Maintain and update rotation-related reporting

Would be a plus

— Experience in HR, Talent Management, or Operations
— Experience working with internal mobility or recruitment processes
— Familiarity with HR systems and tools

Language proficiency:

English — (Upper-Intermediate (B2))

Ukrainian — (Native)

Work conditions:

Immerse yourself in Crypto & Web3:
— Master cutting-edge technologies and become an expert in the most innovative industry.

Work with the Fintech of the Future:
— Develop your skills in digital finance and shape the global market.
Take Your Professionalism to the Next Level:
— Gain unique experience and be part of global transformations.
Drive Innovations:
— Influence the industry and contribute to groundbreaking solutions.

Join a Strong Team:
— Collaborate with top experts worldwide and grow alongside the best.

Work-Life Balance & Well-being:
— Modern equipment.
— Comfortable working conditions, and an inspiring environment to help you thrive.
— 24 calendar days of paid leave.
— Additional days off for national holidays.

With us, you’ll dive into the world of unique blockchain technologies, reshape the crypto landscape, and become an innovator in your field. If you’re ready to take on challenges and join our dynamic team, apply now and start a new chapter in your career!
Let’s Build the Future Together!

WhiteBIT offers all candidates an equal opportunity to join the team. All hiring decisions are made without regard to race, national origin, gender identity or sexual orientation, age, religion, disability, medical condition, marital status, familial status, veteran status, or any other legally protected characteristic of an individual.

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

We create technology you can feel — touch-sensitive, intuitive solutions for retail, HoReCa, and smart spaces. Our products combine hardware, software, and emotions, changing the way people interact with technology.
We are looking for a International Sales Manager to help scale Neuroshop in global markets and build partnerships with forward-thinking companies.

What you will do
Sell our products to B2B customers in Ukraine market
Manage the entire sales cycle — from lead generation to contract signing.
Present our solutions to customers and partners.
Collaborate with product, marketing, and technical support teams.

What is important
2+ years of experience in international sales (SaaS, IoT, Hardware, or Tech Solutions).
Ability to translate complex technologies into understandable business value.
Working with CRM (HubSpot, Pipedrive)
LinkedIn Sales Navigator
Outreach platforms (Apollo)
Ability to create and manage outbound email and LinkedIn campaigns and A/B tests

Understanding of the B2B sales funnel, qualification, and sales frameworks
CRM discipline, creative thinking, communication skills.
Candidate should live in Europe

What we offer
Work with an innovative AI product that is shaping a new era of retail.

Remotely format
Competitive salary + performance-based bonuses.

Neuroshop is a technology you can feel

If you see sales not just as deals, but as a way to create connections between people and technology, we are waiting for you.

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.

The Slot Frontend Engineer is the slot-client authority across Whimsy's slot-development engagements. The role builds and maintains the slot-game client codebase from scratch and owns it through integration, launch, and live operations.

Technical Constraints

• Language: TypeScript
• Renderer: PixiJS v8
• Animation: Spine-Pixi v8 (skeletal), GSAP (tweening)
• Build tool: Vite
• HTTP client: Axios
• Architecture: strict 5-layer separation + typed HFSM at gameplay layer
• Platform integration: third-party slot SDK via pluggable BackendAdapter only
• Regulatory model: jurisdiction-aware client behaviour via configuration (no code rewrites per market)
• Version control: Git
• Target platforms: modern mobile browsers (iOS Safari, Android Chrome) + desktop browsers in use
  
  Responsibilities
• Own the slot-client codebase.
• Own the typed HFSM modelling the slot spin lifecycle, including free spins, bonus rounds, and error / recovery transitions.
• Own the offline mocked backend used for development, QA.
• Own jurisdiction-aware compliance UI: a single client able to satisfy the rule set of different markets under audit without per-market code forks.
• Own session recovery and reconnection behaviour for mid-spin, mid-free-spins, and mid-bonus states.
• Own client-side performance budgets and the asset, atlas, and texture-memory strategy.
• Author and maintain frontend technical documentation: layer contract, HFSM state and transition diagrams, asset manifests, jurisdiction-profile schema.
• Actively use and document the use of AI tools (ChatGPT, Gemini, Claude) for scaffolding, refactor proposals, and documentation. Document outcomes alongside prompts so the workflow is reproducible by the team.

Requirements

• Strict layered architecture: Presentation / HFSM / Domain / Network / Platform; cross-layer access is Non-Compliance.
• Typed HFSM for slot lifecycle (idle, bet, spin request, etc.).
• Robust session recovery: correct resume mid-spin, mid-free-spins, mid-bonus without state inconsistency.
• Full externalisation of game data: paytables, reel strips, RTP, jurisdiction profiles, feature flags must be server/config-driven.
• PixiJS v8 slot rendering for mobile/desktop within performance budgets, with no visual artifacts during reels, cascades, or bonus flows.
• Spine-Pixi v8 expertise for skeletal animations (symbols, characters, bonus presenters), including layered states and event hooks.
• GSAP orchestration for complex sequences: spin-stop, win reveal, cascades, jackpots, bonus entries.
• Tunable animation parameters (easing, timing, anticipation, win effects).
• Asset strategy: atlases, texture packing, and memory-optimized loading for mobile draw-call and RAM constraints.
• Server-authoritative model: client never controls outcome, RNG, balance, or probability.
• Jurisdiction rules must be configuration-based, not code changes per market.
• No secrets/keys/SDK credentials in source, fixtures, or Git history.
• Performance targets: 60 FPS mid-tier mobile, 30 FPS minimum on low-end devices.
• Defined bundle-size and cold-load budgets under poor network conditions.
• Profiling expertise for rendering, animation, and runtime bottlenecks.
• Knowledge of GPU/render optimization: atlases, sprite sheets, render textures, instancing, and their trade-offs.
• Network resilience: timeouts, exponential backoff, idempotent retries (BackendAdapter), deterministic behaviour under packet loss, mid-spin disconnect/reconnect.
• Observability: structured client logging with correlation IDs for spin-level backend tracing.

Nice to have

• Experience with regulated slot / iGaming frontend
• Live ops: jackpots, tournaments, campaigns, A/B tests
• Localization: RTL, CJK support
• Remote config + A/B testing for mechanics and UX
• CI/CD pipelines (lint, type-check, tests, build, deploy, environments)
• Strong Git discipline (atomic commits, PR hygiene)
• Technical documentation: layer contracts, HFSM diagrams, runbooks (English)

What We Offer

• Greenfield backend - you design the architecture, choose the stack, own the outcome
• Small focused team: no bureaucracy, direct access to decision-makers
• Fully remote, async-friendly
• Competitive compensation, discussed individually
• A product that ships - not an endless pre-production