DevBrother

Our client is a key player in securing the Web3 ecosystem against threats like scams, phishing, and impersonation. They create powerful AI-driven systems that detect and neutralize real-time threats, ensuring the safety of millions of users. They work with leading Web3 brands to seamlessly integrate security into the blockchain experience.

We're looking for an ML Backend Developer with a passion for the cryptocurrency space to help us build the critical infrastructure and tools that protect Web3 companies from daily online threats. In this role, you will be a core part of the team, designing and deploying robust systems that leverage machine learning to safeguard digital assets and users. You'll be a key player in a fast-paced environment, taking ownership of projects from design to production.

🔨 Responsibilities:

• Build scalable data pipelines that can process millions of threat signals per day.
• Develop and deploy background workers to perform in-depth scans on malicious websites.
• Design and implement performant image recognition systems to detect impersonation attempts.
• Train and deploy off-the-shelf machine learning models into production environments.
• Instrument and monitor production systems using observability tools like Prometheus, OpenTelemetry (OTel), and Sentry.
• Propose and evaluate new tools and infrastructure to break through performance bottlenecks and ship impactful features.
• Design and optimize database queries and data access patterns for maximum efficiency.
• Improve CI/CD workflows to increase development velocity and ensure high code quality.
• Participate in code reviews on GitHub, providing constructive feedback and ensuring best practices.
• Collaborate with founders and other engineers to scope out projects and act as the project manager for your own initiatives.

💻 Example Projects

To give you a better idea of the work you'll be doing, here are some examples of projects you might lead:

• Build a recursive website scanner that runs a modular set of enrichments and rules, saving the state in a SQL database to ensure durability.
• Train an off-the-shelf classifier, such as XGBoost, on our existing threat database to improve detection accuracy.
• Create a domain-specific language (DSL) for detection rules and build a rules engine sandbox to backtest new rules against production data.

🧰 Qualifications:

• 5+ years of backend engineering experience.
• Experience with machine learning principles, including model training, deployment, and MLOps.
• Strong backend skills with a deep understanding of scalable systems and data pipelines.
• Proficiency with experience in any of the backend languages Rust, Golang, or Python.
• Experience setting up observability tools and troubleshooting production issues.
• Familiarity with Linux, containers (Docker/Kubernetes), networking, and concurrent programming.
• Experience building systems from the ground up (0-1 systems), including API design and modular architecture.
• Previous experience at an early-stage startup is preferred.
• Experience in the security or crypto space is a plus, but not required.

🎁 What We Offer:

• A collaborative and supportive team environment.
• The chance to significantly influence product development and features.
• Medical Insurance;
• Flexible working hours;
• Offices in Ukraine;
• All official holidays;
• Paid vacation and sick leaves;
• Legal services and 24/7 lawyer protection;
• Tax & accounting services;
• The company is ready to provide all the necessary equipment;
• English classes up to three times a week;
• Mentoring and Educational Programs;
• Regular Activities on a Corporate level (Team Buildings, Sports Events, Table Games, Tech Events);
• Advanced Bonus System.

Our client is a pioneer in the gaming industry, leveraging cutting-edge AI and data-driven technologies to revolutionize game development experiences. We are seeking a highly motivated and experienced Brand Marketing Manager with impeccable English to join our innovative team. This role is crucial for amplifying our brand message, showcasing our groundbreaking AI-powered solutions, and driving awareness for our next-generation applications that manage and interact with robust AI agents.
 

You will be instrumental in shaping our public image and market presence, working closely with our core engineering team of AI, Data, DevOps, and Full-Stack experts. 
 

If you have a proven track record of successful product marketing and strategic launches, thrive in a dynamic startup environment, and are passionate about communicating the impact of AI in gaming, this opportunity is for you!

Responsibilities:

• Develop and execute comprehensive marketing and brand strategies to increase brand visibility, drive user engagement, and support product launches.
• Manage and grow our presence on key social media platforms, including X (formerly Twitter), LinkedIn, and Reddit, leveraging platform-specific strategies to engage target audiences.
• Lead product marketing efforts, defining value propositions, crafting compelling messaging, and creating marketing collateral for our AI-driven gaming applications.
• Plan and execute strategic product launches, coordinating cross-functional teams to ensure maximum market impact and successful adoption.
• Cultivate and maintain strong relationships with media outlets, industry influencers, and key opinion leaders to secure positive coverage and thought leadership opportunities.
• Create high-quality, engaging content, including press releases, blog posts, website copy, social media updates, case studies, and presentations.
• Monitor market trends, competitor activities, and industry developments to identify new opportunities and inform marketing strategies.
• Analyze marketing campaign performance, derive actionable insights, and optimize strategies for continuous improvement.
• Collaborate closely with the product development team to understand features and benefits, translating technical details into compelling marketing narratives.
• Represent the company at industry events, conferences, and webinars, enhancing our brand reputation and network.

Qualifications:

• Perfect English proficiency (both written and verbal) is a must, with exceptional copywriting and communication skills.
• Bachelor’s degree in Marketing, Communications, Public Relations, or a related field.
• 5+ years of extensive experience in marketing in game development or iGaming, specifically with a strong focus on social media management and product launches.
• Demonstrated expertise in managing and growing presence on X (formerly Twitter), LinkedIn, and Reddit, with a deep understanding of their respective communities and best practices.
• Proven experience in product marketing, including developing go-to-market strategies, messaging, and collateral for innovative tech products.
• Track record of successful strategic product launches from planning to execution and post-launch analysis.
• Strong understanding of the technology landscape, particularly in AI/ML, software development, and cloud-based applications.
• Excellent storytelling abilities, with the capacity to simplify complex technical concepts into clear, engaging, and benefit-driven messages.
• Analytical mindset with experience using marketing analytics tools to measure campaign effectiveness and ROI.
• Proactive, creative, and results-oriented individual with strong organizational skills and the ability to manage multiple projects simultaneously.
• Experience working in the gaming industry, startups, and high-growth environments is highly desirable.

🎁 We offer:

- Daily support for your technical and personal growth;

- Professional and very friendly team, that is always ready to help and support;

- Medical Insurance;

- Flexible working hours;

- Offices in Ukraine;

- All official holidays;

- Paid vacation and sick leaves;

- Legal services and 24/7 lawyer protection;

- Tax & accounting services;

- The company is ready to provide all the necessary equipment;

- English classes up to three times a week;

- Workstation space;

- Mentoring and Educational Programs;

- Regular Activities on a Corporate level (Team Buildings, Sports Events, Table Games, Tech Events);

- Advanced Bonus System.

We are helping our clients build a cutting-edge browser focused on LLMs, easy to discover and use on your mobile phone. Private by design. This innovative browser aims to revolutionize how users interact with online content by leveraging advanced large language models to provide a more intuitive, personalized, and secure browsing experience. It will prioritize user privacy through robust encryption and data handling protocols, ensuring that personal information remains protected while still offering seamless integration with AI-powered features. The development emphasizes a user-friendly interface optimized for mobile devices, making complex AI functionalities accessible and easy to use for everyday tasks.

🧰 Responsibilities:

• Prototype new features and improvements for a browser on mobile devices. This involves exploring and validating design concepts for a user-friendly interface optimized for mobile.
• Develop new features and improvements for the browser. This includes implementing functionalities related to LLMs, content discovery, and a secure browsing experience.
• Ship new features and improvements for the browser. This encompasses the entire release cycle, ensuring stable and performant updates for users.
• Implement robust encryption and data handling protocols to ensure user privacy and data protection within the browser.
• Optimize the user-friendly interface for mobile devices, making complex AI functionalities accessible and effortless.

💻 You might be a good fit if you:

• Have Upper-Intermediate English or higher
• 4+ years of experience in iOS/macOS development using Swift
• Have the ability to write clean, maintainable, and efficient code.
• Have confidence in building animations, gestures, and UI state managers.
• Have a keen eye for detail in crafting user interfaces that feel "nice" and intuitive.
• Can use mockup and UI prototyping tools to express your ideas
• Like working on small, fast-moving teams
• An interest in the future of web browsers and content discovery, particularly with a focus on AI/LLMs.
• Experience or strong understanding of implementing robust encryption and data handling protocols for user privacy.
• A passion for learning and building new things.

👑 What We Offer:

• A collaborative and supportive team environment.
• The chance to significantly influence product development and features.
• Medical Insurance in Ukraine and Multisport program in Poland;
• Flexible working hours;
• Offices in Ukraine;
• All official holidays;
• Paid vacation and sick leaves;
• Tax & accounting services for Ukrainian contractors;
• The company is ready to provide all the necessary equipment;
• English classes up to three times a week;
• Mentoring and Educational Programs;
• Regular Activities on a Corporate level (Team Buildings, Sports Events, Table Games, Tech Events);
• Advanced Bonus System.

We are seeking a passionate and capable Software Engineer with solid experience in backend or full-stack development to join a distributed team building next-generation data and AI products. You will build scalable systems, work with large volumes of data, and contribute to full-stack product development in a fast-moving, collaborative environment.
 

This is a great opportunity for an engineer with a few solid years of experience who is ready to grow, take ownership, and make a meaningful product impact.
 

🚀 What You’ll Do

• Build backend services in Clojure within a functional programming environment.
• Design and improve distributed data platforms that handle structured and unstructured data.
• Work on real-time data processing pipelines powered by Kafka, Spark, and Presto.
• Collaborate with cross-functional teams — Product, Design, and Engineering — to ship impactful features.
• Participate in architecture discussions, code reviews, and agile development processes.
• Integrate with external APIs and tools, ensuring performance, reliability, and scalability.
• Help evolve the system’s architecture, performance, and resilience as the platform grows.

🛠 Tech Stack

• Languages & Frameworks: Clojure, ClojureScript
• Data Infrastructure: Apache Spark, Presto, Kafka
• Cloud & DevOps: Kubernetes, Terraform, multi-cloud setup
• AI/ML: AI agents, ML models for personalization, prediction, and data enrichment
   

🧑‍💻 You Might Be a Great Fit If You

• Have Upper-Intermediate English or higher
• Have 3–5 years of professional experience in backend or full-stack development.
• Have hands-on experience with Clojure (or another functional programming language and a willingness to work with Clojure).
• Understand functional programming principles and enjoy applying them.
• Have some exposure to distributed systems, big data pipelines, or ML-powered platforms.
• Are comfortable working with cloud-native environments (Kubernetes, Terraform, multi-cloud setups).
• Identify with traits like: curious, responsible, detail-oriented, eager to grow, collaborative.

🎁 We offer:

• Daily support for your technical and personal growth;
• Professional and very friendly team, that is always ready to help and support;
• Medical Insurance;
• Flexible working hours;
• Offices in Ukraine;
• All official holidays;
• Paid vacation and sick leaves;
• Legal services and 24/7 lawyer protection;
• Tax & accounting services;
• The company is ready to provide all the necessary equipment;
• English classes up to three times a week;
• Workstation space;
• Mentoring and Educational Programs;
• Regular Activities on a Corporate level (Team Buildings, Sports Events, Table Games, Tech Events);
• Advanced Bonus System.

Our client is a fast-growing software engineering company building cutting-edge solutions in the blockchain and Web3 space. They specialize in open-source technologies and work across ecosystems such as Cosmos, Solana, and SUI, creating infrastructure and applications that push the boundaries of decentralized technology. With a globally distributed team, they foster a remote-first culture and drive innovation in the DeFi sector.
 

We’re looking for a Senior Software Engineer (Rust) with a passion for blockchain and decentralized finance to join the team and help build a new generation DeFi product. In this role, you will be at the forefront of developing high-performance backend systems, designing APIs, and integrating with leading blockchain ecosystems. You’ll play a key role in a fast-paced international environment, contributing to product architecture and taking ownership of features from concept to production.

💻 Tech Stack:

• Ecosystems: Cosmos, SUI, Solana.
• Languages: Rust, Golang, TypeScript, Move, Solidity.
• Tools: Docker, Protobuf (prost), gRPC (tonic), Grafana, OpenTelemetry, GitHub Actions, Buf.
   

🧰 You might be a good fit if you:

• Strong proficiency in Rust and Node.js for backend development.
• Deep understanding of async programming, performance, and API design.
• Proven track record of building end-to-end Rust applications.
• Proficient with Git.
• Self-starter, able to work cross-functionally and independently.
• Upper-Intermediate English or higher.
   

✨ Nice to have:

• Familiarity with the Cosmos, SUI, and/or Solana ecosystems.
• Understanding of financial technology and decentralized systems.
• Experience in web3, decentralized finance (DeFi) decentralized applications (dapps) and blockchain principles.
• Experience with continuous integration pipelines (preferably GitHub Actions, CircleCI, Travis).
• ProtoBuf, gRPC.
• Open source development experience.
• Highly organized with great attention to detail.
• Strong DegenScore.
• Bonus: Has written smart contracts in Rust or Solidity (Rust preferred, however a Solidity position will be opened shortly).
  
  🎁 We offer:
• Daily support for your technical and personal growth;
• Professional and very friendly team, that is always ready to help and support;
• Medical Insurance;
• Flexible working hours;
• Offices in Ukraine;
• All official holidays;
• Paid vacation and sick leaves;
• Legal services and 24/7 layer protection;
• Tax & accounting services;
• The company provides all the necessary equipment;
• Fitness support upon request;
• English classes up to three times a week;
• The company pays 50% of the cost of refresher courses for any employee of the company;
• Workstation space;
• Mentoring and Educational Programs;
• Regular Activities on a Corporate level (Team Buildings, Sports Events, Table Games, Tech Events);
• Advanced Bonus System.

We are building a unified Web3 platform that streamlines wallet management, trading, research, and social insights into a single interface. Designed for both newcomers and experienced traders, it simplifies on-chain interactions by eliminating fragmentation and providing advanced execution tools, as well as real-time market intelligence.

We are seeking a Mid-Level UI/UX Designer to join our fast-growing startup and lead the design of our cutting-edge Web3 platform. The ideal candidate will be responsible for creating intuitive, user-centric, and visually stunning interfaces that simplify complex Web3 interactions and provide a seamless user experience.

As a key member of our product team, you'll work closely with engineers, product managers, and our CEO to define the user experience and visual design of our platform.

Responsibilities:

• Lead the end-to-end design process, from user research and wireframing to prototyping and high-fidelity mockups.
• Translate complex requirements into elegant, user-friendly designs for both desktop and mobile interfaces.
• Create and maintain a comprehensive design system to ensure consistency and efficiency across all products.
• Collaborate with the development team to ensure the final product is built to spec and provides an optimal user experience.

Technical Skills:

• 2+ years of experience as a UI/UX designer, preferably within the fintech, crypto, or trading space.
• Proficiency with modern design and prototyping tools such as Figma, Sketch, or Adobe XD.
• Proven experience in designing and shipping digital products.
• A strong portfolio showcasing a solid understanding of user-centered design principles and a keen eye for visual aesthetics.

Will be a plus:

• Experience with Web3 products or a strong understanding of blockchain technology, decentralized finance (DeFi), and NFTs.
• Experience conducting user interviews and usability testing.
• Knowledge of HTML, CSS, and JavaScript.
• A degree in Design, Human-Computer Interaction, or a related field.

🎁 We offer:

- Daily support for your technical and personal growth;

- Professional and very friendly team, that is always ready to help and support;

- Medical Insurance in Ukraine;

- Flexible working hours;

- Offices in Ukraine and Poland;

- All official holidays;

- Paid vacation;

- Legal services and 24/7 lawyer protection;

- Tax & accounting services;

- The company provides all the necessary equipment;

- Fitness support upon request;

- English classes up to three times a week;

- The company pays 50% of the cost of refresher courses for any employee of the company;

- Workstation space;

- Mentoring and Educational Programs;

- Regular Activities on a Corporate level (Team Buildings, Sports Events, Table Games, Tech Events);

- Advanced Bonus System.