Jobs at Djinni

fullstack Engineer – Cloud & AI Platform Development, #Kyiv office, 4-6k$, upper English 

About the Role

We are seeking a Software Engineer to support the development of a secure, cloud-based platform that will combine AI-assisted workflows, third-party API integrations, data processing, automation, and internal analytical tools.

The role requires a developer with strong practical experience in Amazon AWS or comparable cloud infrastructure, hands-on work with AI/LLM APIs, and the ability to build reliable backend services, integrations, and user-facing platform functionality. The candidate should be comfortable working with sensitive business requirements while maintaining high standards for security, scalability, and technical documentation.

Key Responsibilities

Develop and maintain backend services, APIs, frontend components, dashboards, and internal platform tools.

Build and manage integrations with third-party APIs, including external data providers, AI services, automation tools, and other software systems.

Implement AI-assisted workflows, including prompt management, structured outputs, automated data processing, classification, summarization, and validation of AI-generated results.

Support the deployment and maintenance of cloud infrastructure on Amazon AWS or similar platforms, including storage, databases, access controls, logging, monitoring, and scalable processing.

Design and maintain secure data pipelines, background tasks, workflow automation, and report-generation functionality.

Implement secure authentication, role-based access control, workspace separation, encryption, secrets management, and audit logging.

Support CI/CD pipelines, testing, debugging, performance optimization, and system reliability.

Prepare technical documentation, including architecture notes, API documentation, data-flow descriptions, and deployment instructions.

Work with product and business stakeholders to translate operational needs into practical software features.

Required Qualifications

3+ years of professional software development experience, preferably in cloud-based platforms, SaaS products, automation systems, data-driven tools, or security-sensitive software environments.

Strong experience with one or more backend languages, such as Python, Node.js / TypeScript, Go, Java, or C#.

Practical experience with Amazon AWS or comparable cloud platforms. The candidate should understand cloud deployment, storage, databases, IAM/access controls, logging, monitoring, scaling, and secure configuration.

Strong hands-on experience with AI/LLM APIs and AI-enabled workflow implementation, including prompt design, structured outputs, model integration, workflow automation, and validation of generated results.

Experience building APIs and integrating third-party services, including authentication, rate limits, error handling, retries, data normalization, and monitoring.

Experience with modern databases such as PostgreSQL, MySQL, DynamoDB, MongoDB, or similar.

Understanding of secure software development practices, including access control, input validation, secure credential handling, encryption, logging, and dependency management.

Ability to work independently, solve technical problems, and clearly document technical decisions.

Preferred Qualifications

Experience with modern frontend frameworks such as React, Next.js, Vue, or similar.

Experience with Docker, serverless architecture, queues, background jobs, or workflow orchestration tools.

Familiarity with infrastructure as code, such as Terraform, AWS CDK, CloudFormation, or similar.

Experience with AI-assisted applications, embeddings, retrieval-based workflows, data extraction, or automated report generation.

Understanding of cloud security, API security, privacy-conscious data handling, and secure multi-user platform architecture.

Experience working in an early-stage product environment or building MVPs from the ground up.

Candidate Profile:

The ideal candidate is a cloud-oriented, security-minded software engineer with strong backend or full-stack capabilities. They should be able to build reliable platform infrastructure, integrate multiple external services, implement AI-enabled workflows, and support secure deployment on AWS or similar cloud infrastructure.

The role is best suited for someone who can combine practical engineering, cloud architecture, AI implementation, API integration, and secure development practices in a fast-moving product environment.

Our client is an international product-based IT company specializing in the iGaming industry. Born in 2014, they rocked the CIS region and are now taking their success worldwide.

We are currently looking for a Traffic Quality Manager.

📋 Key responsibilities and your contribution:

• Monitor and analyze marketing traffic quality across all acquisition channels.
• Detect, investigate, and prevent fraudulent activities related to affiliate programs, paid traffic, bonus abuse, multi-accounting, incentivized traffic, and other marketing fraud schemes.
• Conduct regular reviews of affiliates, traffic sources, campaigns, and user segments to identify suspicious patterns and anomalies.
• Develop, maintain, and improve anti-fraud rules, segments, and monitoring processes for marketing traffic.
• Collaborate with Marketing, Product, Analytics and Payments teams on fraud prevention initiatives.
• Prepare analytical reports, dashboards, and presentations on traffic quality, fraud trends, and anti-fraud performance.
• Participate in incident investigations and provide recommendations on sanctions, traffic restrictions, and process improvements.
• Define requirements for automation of anti-fraud controls and support the implementation of new anti-fraud solutions.
• Monitor key marketing and anti-fraud KPIs and proactively identify emerging risks.
• Support onboarding and audits of new affiliates, traffic sources, and acquisition channels from an anti-fraud perspective.
• Participate in testing and validation of new fraud detection tools, integrations, and analytical solutions.
• Maintain documentation, procedures, and knowledge base related to marketing anti-fraud processes.

📚 Your qualifications:

• Understanding of key fraud schemes in digital marketing and affiliate marketing.
• Experience analyzing marketing traffic quality and identifying anomalies at the level of campaigns, partners, sources, and individual users.
• Confident use of anti-fraud and analytical tools: SEON, Tableau, BI systems, and other internal services.
• Ability to work with large data sets, build samples, identify patterns, and prepare data-based conclusions.
• Experience participating in investigations of abuse related to marketing mechanics and affiliate programs.
• Ability to prepare requirements for anti-fraud automation and participate in testing new rules, segments, and suspicious activity triggers.
• Skills in preparing regular analytical reports, monitoring key traffic quality metrics, and evaluating the effectiveness of implemented anti-fraud measures.
• Understanding of affiliate marketing principles, CPA/CPL/CPS models, and key marketing metrics.
• Confident user of Microsoft Excel / Google Sheets.

➕ Nice to have:

• Experience with SQL, Tableau, Power BI, or other BI tools.

   

Benefits:

⭐ Time Off & Recovery: 20 working days of fully paid annual leave, fully paid sick leave, and public holidays off according to company policy.

⭐ Health & Wellness: A flexible Benefits cafeteria that allows you to choose the perks that fit you best, with options including medical support, regular check-ups, mental health services, or gym access.

⭐ Education & Development: Internal and external training, industry events, language courses, and professional service subscriptions.

⭐ Workspace & Tech: All necessary corporate equipment provided, the flexibility to work fully remotely, and premium digital tools to enhance performance (e.g., AI tools, ChatGPT Plus).

⭐ Work Environment & Perks: Holiday bonuses, gifts for special occasions, paid business trips, and team events.

Our client is an international product-based IT company specializing in the iGaming industry. Born in 2014, they rocked the CIS region and are now taking their success worldwide.

We are currently looking for a Traffic Quality Manager.

📋 Key responsibilities and your contribution:

• Monitor and analyze marketing traffic quality across all acquisition channels.
• Detect, investigate, and prevent fraudulent activities related to affiliate programs, paid traffic, bonus abuse, multi-accounting, incentivized traffic, and other marketing fraud schemes.
• Conduct regular reviews of affiliates, traffic sources, campaigns, and user segments to identify suspicious patterns and anomalies.
• Develop, maintain, and improve anti-fraud rules, segments, and monitoring processes for marketing traffic.
• Collaborate with Marketing, Product, Analytics and Payments teams on fraud prevention initiatives.
• Prepare analytical reports, dashboards, and presentations on traffic quality, fraud trends, and anti-fraud performance.
• Participate in incident investigations and provide recommendations on sanctions, traffic restrictions, and process improvements.
• Define requirements for automation of anti-fraud controls and support the implementation of new anti-fraud solutions.
• Monitor key marketing and anti-fraud KPIs and proactively identify emerging risks.
• Support onboarding and audits of new affiliates, traffic sources, and acquisition channels from an anti-fraud perspective.
• Participate in testing and validation of new fraud detection tools, integrations, and analytical solutions.
• Maintain documentation, procedures, and knowledge base related to marketing anti-fraud processes.

📚 Your qualifications:

• Understanding of key fraud schemes in digital marketing and affiliate marketing.
• Experience analyzing marketing traffic quality and identifying anomalies at the level of campaigns, partners, sources, and individual users.
• Confident use of anti-fraud and analytical tools: SEON, Tableau, BI systems, and other internal services.
• Ability to work with large data sets, build samples, identify patterns, and prepare data-based conclusions.
• Experience participating in investigations of abuse related to marketing mechanics and affiliate programs.
• Ability to prepare requirements for anti-fraud automation and participate in testing new rules, segments, and suspicious activity triggers.
• Skills in preparing regular analytical reports, monitoring key traffic quality metrics, and evaluating the effectiveness of implemented anti-fraud measures.
• Understanding of affiliate marketing principles, CPA/CPL/CPS models, and key marketing metrics.
• Confident user of Microsoft Excel / Google Sheets.

➕ Nice to have:

• Experience with SQL, Tableau, Power BI, or other BI tools.

   

Benefits:

⭐ Time Off & Recovery: 20 working days of fully paid annual leave, fully paid sick leave, and public holidays off according to company policy.

⭐ Health & Wellness: A flexible Benefits cafeteria that allows you to choose the perks that fit you best, with options including medical support, regular check-ups, mental health services, or gym access.

⭐ Education & Development: Internal and external training, industry events, language courses, and professional service subscriptions.

⭐ Workspace & Tech: All necessary corporate equipment provided, the flexibility to work fully remotely, and premium digital tools to enhance performance (e.g., AI tools, ChatGPT Plus).

⭐ Work Environment & Perks: Holiday bonuses, gifts for special occasions, paid business trips, and team events.

We are looking for a Technical Product Manager / Product Manager to own the wallet infrastructure domain within our payments product. 

This role focuses on building secure, scalable, and compliant wallet and custody infrastructure that enables users to deposit, withdraw, and manage digital assets. You will define the product strategy and requirements for hot/cold wallet architecture, custody models, key management, internal ledgering, fund flows, reconciliation, transaction policies, and staking infrastructure. This is a hands-on product role for someone who can write clear PRDs, challenge technical decisions, and turn complex infrastructure, compliance, and operational needs into executable product requirements.

Responsibilities

• Own the wallet infrastructure roadmap, including hot/cold wallet architecture, custody model, and key management requirements.
• Lead vendor evaluation and integration for wallet infrastructure providers such as BitGo, Fireblocks, or similar platforms.
• Define product requirements for internal ledgering and fund flows, including deposits, withdrawals, sweeps, and reconciliation.
• Design policy and control requirements for transaction limits, whitelists, approval workflows, and operational risk controls.
• Lead the staking product lifecycle, from infrastructure requirements and partner coordination to the end-user experience.
• Partner with Compliance, Legal, Engineering, and Operations to implement AML screening, Travel Rule workflows, and regulatory reporting requirements.

Requirements

• 2+ years in a Product Manager or Technical Product Manager role at a financial platform or crypto-native fintech
• Direct experience owning or contributing to wallet/custody infrastructure in production
• Hands-on experience with BitGo, Fireblocks, or similar custody solutions in a live environment
• Deep understanding of hot/cold wallet architecture and internal ledger design at scale
• Ability to work at both strategic and technical level - you can write a PRD and go deep on API docs
• Strong opinions on MPC vs multisig, omnibus vs segregated - backed by real experience

Will be a plus

• Experience migrating between custody providers
• Worked at a platform with 1M+ users
• Experience with staking operations at scale
• Familiarity with Travel Rule compliance and AML tooling (Chainalysis, Elliptic)

We offer

• 20 paid vacation days per year
• 10 paid sick leave days per year
• Public holidays according to current legislation
• Medical insurance
• Opportunity to work remotely
• Professional education budget
• Language learning budget
• Wellness budget (gym membership, sports gear and related expenses)

We are looking for an experienced Technical Lead Full Stack Engineer (Java+React) to join and guide the development team.

Our customer – integrated Shipping Services has set itself apart as an independent carrier with a fresh, unique approach. His strategy as a global niche carrier offers distinctive advantages to customers worldwide. We have created a smart, efficient network that ensures stable, reliable services; and we have made it our mission to focus on the needs of our customers, which stand at the heart of all our decisions. The main idea of our product operates in select trades, where it has a competitive advantage and where it can provide superior service. We maintain a flexible partnership approach with other major carriers, and our new line structure is a much-needed alternative to customers concerned about the current alliance-dominated market.

Responsibilities:

• Guide, mentor, and foster the growth of full-stack engineers within the team, championing engineering excellence and XP practices.
• Lead the architectural design and technical direction of innovative full-stack applications, ensuring scalability, security, and alignment with business goals.
• Establish and champion high standards of code quality, testing (TDD/BDD), CI/CD pipelines, and robust DevOps practices.
• Act as a key technical point of contact, collaborating closely with product owners and stakeholders to translate complex requirements into actionable technical strategies.
• Direct full-stack development of innovative applications, remaining actively involved in writing code and remote pairing.
• Own the entire development cycle, including design, architecture, development, testing, and DevOps deployment.

• Foster a highly collaborative Extreme Programming (XP) environment featuring remote pairing and rapid feedback loops.

   

Requirements:

• BS degree in Computer Science or an equivalent combination of education and experience.
• Experience in technical leadership is a must.
• 5-6+ years of full-stack development experience.
• 5-6+ years of experience in the following technologies: Java, Spring.
• Proven experience with Functional Programming and Java Streams.
• 2+ years of experience in front-end development with React.
• Experience with developing a reactive UI (Reactive JS).
• 2+ years of experience in TDD/BDD development in the following frameworks: JUnit, Jasmine, Mockito, Protractor/Selenium.
• 2+ years of experience in microservices-based architecture and tools (Spring Boot/Cloud).
• AI experience 
• Experience in DevOps development and Jenkins (must).
• Experience in development in Kotlin – an advantage.
• Experience in designing, developing, and deploying cloud/hybrid-based solutions.
• Experience in developing and deploying in Container-based environments (Kubernetes, Cloud Foundry).
• Deep familiarity with the following design concepts: microservices, service discovery, circuit breakers.
• Strong leadership abilities with the capacity to appropriately prioritize, plan, and delegate complex work in a rapidly changing environment.
• Versatility and capability to switch easily between different tasks and technologies.
• Experience in assessing a broad range of information solutions and products.
• Strong critical thinker with an exceptional problem-solving aptitude.

• Excellent English skills - both verbal and written.

   

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

We are looking for an experienced Technical Lead Full Stack Engineer (Java+React) to join and guide the development team.

Our customer – integrated Shipping Services has set itself apart as an independent carrier with a fresh, unique approach. His strategy as a global niche carrier offers distinctive advantages to customers worldwide. We have created a smart, efficient network that ensures stable, reliable services; and we have made it our mission to focus on the needs of our customers, which stand at the heart of all our decisions. The main idea of our product operates in select trades, where it has a competitive advantage and where it can provide superior service. We maintain a flexible partnership approach with other major carriers, and our new line structure is a much-needed alternative to customers concerned about the current alliance-dominated market.

Responsibilities:

• Guide, mentor, and foster the growth of full-stack engineers within the team, championing engineering excellence and XP practices.
• Lead the architectural design and technical direction of innovative full-stack applications, ensuring scalability, security, and alignment with business goals.
• Establish and champion high standards of code quality, testing (TDD/BDD), CI/CD pipelines, and robust DevOps practices.
• Act as a key technical point of contact, collaborating closely with product owners and stakeholders to translate complex requirements into actionable technical strategies.
• Direct full-stack development of innovative applications, remaining actively involved in writing code and remote pairing.
• Own the entire development cycle, including design, architecture, development, testing, and DevOps deployment.

• Foster a highly collaborative Extreme Programming (XP) environment featuring remote pairing and rapid feedback loops.

   

Requirements:

• BS degree in Computer Science or an equivalent combination of education and experience.
• Experience in technical leadership is a must.
• 5-6+ years of full-stack development experience.
• 5-6+ years of experience in the following technologies: Java, Spring.
• Proven experience with Functional Programming and Java Streams.
• 2+ years of experience in front-end development with React.
• Experience with developing a reactive UI (Reactive JS).
• 2+ years of experience in TDD/BDD development in the following frameworks: JUnit, Jasmine, Mockito, Protractor/Selenium.
• 2+ years of experience in microservices-based architecture and tools (Spring Boot/Cloud).
• AI experience 
• Experience in DevOps development and Jenkins (must).
• Experience in development in Kotlin – an advantage.
• Experience in designing, developing, and deploying cloud/hybrid-based solutions.
• Experience in developing and deploying in Container-based environments (Kubernetes, Cloud Foundry).
• Deep familiarity with the following design concepts: microservices, service discovery, circuit breakers.
• Strong leadership abilities with the capacity to appropriately prioritize, plan, and delegate complex work in a rapidly changing environment.
• Versatility and capability to switch easily between different tasks and technologies.
• Experience in assessing a broad range of information solutions and products.
• Strong critical thinker with an exceptional problem-solving aptitude.

• Excellent English skills - both verbal and written.

   

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

UITOP, a design & development team. We help B2B SaaS products feel simple, modern, and easy to use.
 

We are looking for Full Stack Developers. You will work on SaaS and data-heavy systems, diving deep into business logic with a real influence on technical and product decisions.

Requirements

• 2-4 years of experience as a Full Stack Developer, specifically with React.js and Node.js
• Strong expertise in TypeORM, Webpack, PostgreSQL, and Redis
• Proficiency with Express.js or NestJS for building scalable systems that can handle complex ERP business logic.
• Use AI tools (AI agents, Claude Code, Cursor, Codex or similar) in daily workflow. 
• Apply your experience in building SaaS or data-heavy applications, including CRM/ERP.
• Deep knowledge of Material-UI (MUI) and RESTful API design. 
• Upper-Intermediate English (B2) for effective communication and technical discussions. 

Benefits

• Regular performance and salary reviews. 
• Working with complex large-scale SaaS projects, from 6 months.
• 18 working days of vacation and 10 sick days.
• Compensation 50% for professional development cources. 
• Free Internal English classes.
• Company equipment. We’ll provide a laptop after 6 months of work. 
• Financial compensation of coworking 100% (during blackouts).
• Flexible work schedule, remote.
  
  We are looking for a highly motivated and talented individual to join our team. If this sounds like your next big challenge, let’s chat! 

About Us

At Uitop, we design intuitive, scalable UI/UX for fast-growing B2B SaaS platforms across industries like logistics, finance, construction, and so on.

Job Summary
We are looking for a Ruby on Rails Developer to join our team. The role focuses on backend development, building and optimizing systems. The position also involves integrating AI features to enhance the platform.

What do you have

• At least 4 years of experience with Rails. 
• Proficient in Backend: you have at least three years of experience with Ruby and Ruby on Rails (most important), ideally 3-4 years.
• Frontend: Vanilla JavaScript, Hotwire with StimulusJS & Turbo a bit.
• Knowledge of Data Stores: Postgres and Redis; Sidekiq; S3. 
• Experience with Stimulus, TailwindCSS. 
• Experience with cloud environments, Terraform, networking and security concepts is a big plus. 
• Good English communication skills (B2 level), be ready to communicate effectively in English.

About project
The platform helps cities, developers, and urban planners automate and simplify the permit approval process, reducing errors and speeding up approvals with AI.

What we have

• Vacation - 18 working days per year, 10 Sick Days;
• 50% coverage of English language courses/any kind of courses;
• Working with complex SaaS systems for a long time;
• Performance & salary review constantly.
• Professional development support (books, online courses, conferences, certifications, Internal English classes);
• The opportunity to influence the project with your decisions;
• Financial compensation of coworking 100% (during blackouts);
• Flexible work schedule, remote.

Our focus is on a result-oriented person, ready to learn and implement new technologies. Maybe you are our match, let's talk!

About PredictSpring

PredictSpring is a market-leading company shaping the future of omni-channel retail and modern POS technology. We help global retail and lifestyle brands deliver seamless, modern, and scalable customer experiences across digital and in-store channels.

We are looking for an experienced Senior Golang Full Stack Engineer to join our team and help build scalable, secure, and high-performance software solutions across our platform, products, and business operations.

In this role, you will contribute to both backend and frontend development, working with Go/Golang, modern frontend technologies, cloud infrastructure, containerization, and CI/CD workflows. You will help deliver reliable enterprise-grade systems that support modern commerce, retail operations, and customer experience.

Responsibilities

As a Senior Golang Full Stack Engineer, you will:

• Design, develop, and maintain scalable, secure, and high-performance applications using Go/Golang, JavaScript, and modern frontend technologies.
• Build and maintain backend services, APIs, business logic, and application workflows that support PredictSpring’s platform and product operations.
• Develop and implement RESTful APIs to integrate frontend applications, backend services, third-party systems, and internal tools.
• Work with cloud-based infrastructure on AWS and Azure to support scalable, reliable, and production-ready systems.
• Build responsive and maintainable frontend features using modern JavaScript frameworks such as React.js, Angular, or Vue.js.
• Utilize Docker and Kubernetes to containerize applications, streamline deployment, and support scalable production environments.
• Collaborate with cross-functional teams, including product, engineering, design, operations, and business stakeholders, to deliver high-quality software solutions.
• Maintain clear and effective communication throughout the development process, especially when working with distributed global teams.
• Troubleshoot, debug, and optimize applications for performance, scalability, reliability, and maintainability.
• Write clean, efficient, maintainable, and testable code following best practices in Go/Golang, JavaScript, and full stack development.
• Participate in code reviews, technical discussions, architecture decisions, and continuous improvement of engineering standards.
• Implement and manage CI/CD pipelines using AWS, Azure, and modern DevOps tools for efficient and automated deployments.
• Ensure security, data protection, and reliability across applications, services, APIs, and cloud environments.
• Stay current with the latest software engineering, cloud, DevOps, and full stack development practices, and apply relevant improvements to PredictSpring’s platform and operations.

Requirements

We are looking for someone with:

• Excellent communication skills, including fluent verbal English, with the ability to explain technical concepts clearly and collaborate effectively across distributed teams.
• Bachelor’s or Master’s degree in Computer Science, Software Engineering, Information Technology, or a related field.
• Proven experience as a Full Stack Engineer or Full Stack Developer, with strong expertise in Go/Golang for backend services.
• Strong experience designing, building, and maintaining scalable backend systems, APIs, and enterprise-grade applications.
• Strong knowledge and hands-on experience with AWS and Azure cloud services.
• Extensive experience with JavaScript and modern frontend frameworks such as React.js, Angular, or Vue.js.
• Expertise in containerization and orchestration technologies such as Docker and Kubernetes.
• Proficiency with SQL and NoSQL databases, such as SQL Server, MongoDB, PostgreSQL, or similar technologies.
• Familiarity with frontend technologies such as HTML5, CSS, SASS, or LESS.
• Experience building and consuming RESTful APIs for seamless system integration.
• Knowledge of version control systems such as Git and collaborative development workflows.
• Strong problem-solving skills with the ability to troubleshoot complex issues across the full stack.
• Familiarity with agile development methodologies, sprint-based workflows, and collaborative engineering practices.
• Experience with CI/CD processes and modern deployment pipelines.
• Ability to work effectively with cross-functional teams across different time zones.

Preferred Qualifications

Nice to have:

• Experience with microservices architecture and distributed system design.
• Experience with serverless computing and cloud-native application development.
• Familiarity with DevOps practices and infrastructure-as-code tools such as Terraform and CloudFormation.
• Strong understanding of cloud-native security services, application security, authentication, authorization, and data protection best practices.
• Experience with testing frameworks, including unit testing, integration testing, and UI testing.
• Experience working with high-traffic, scalable, customer-facing SaaS or enterprise platforms.
• Experience supporting production systems, monitoring application health, and improving reliability over time.
• Experience in retail, e-commerce, omni-channel commerce, or POS technology is a strong plus.

Why PredictSpring?

• Join a market-leading company shaping the future of omni-channel retail and modern POS.
• Work on high-impact engineering challenges at the intersection of commerce, cloud technology, and customer experience.
• Collaborate with a talented global team in a flexible remote work environment.
• Enjoy opportunities for growth, learning, and professional development.
• Contribute to products used by some of the world’s most recognized retail and lifestyle brands.
• Be part of an innovative, collaborative, and engineering-driven culture focused on building reliable, scalable, and measurable business value.

We’re seeking a skilled Senior Golang Developer to join the Recorded Future Payment Fraud Intelligence team. In this role, you’ll contribute to an actively developing product, building new features and integrating with a variety of external services.

Responsibilities and Duties:

• Design and build scalable, highly available, and resilient systems with a focus on continuous delivery
• Collaborate within a cluster-based, cross-functional team environment
• Participate in the full lifecycle of feature development - from ideation through deployment and long-term maintenance
• We encourage candidates to submit a portfolio or code sample that demonstrates their engineering capabilities
• Accurately log time against project tickets to support team efficiency and transparency

• Take ownership: define a development plan, advocate for it, build it, ship it - and stand behind your work

   

Qualifications:

• apache/kafka
• git
• At least 6 years of experience with golang/go: 
  • gocolly/colly: Elegant Scraper and Crawler Framework for Golang
  • gofiber/fiber: Express inspired web framework written in Go
  • labstack/echo: High performance, minimalist Go web framework
• Experience with gRPC: C++ based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
• Working experience with NoSQL:
  • mongodb: The MongoDB Database
  • elastic’elasticsearch: Free and Open Source, Distributed, RESTful Search Engine 
  • redis: An in-memory key-value data structure store.
• Working experience with SQL:
  • mysql-server: MySQL Server, the world's most popular open source database, and MySQL Cluster, a real-time, open source transactional database.
  • postgres

Nice to have:

• OCR tools
• Ansible
• Kubernetes

• Prometheus

   

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

About PredictSpring

PredictSpring is a market-leading company shaping the future of omni-channel retail and modern POS technology. We help global retail and lifestyle brands deliver seamless, modern, and data-driven customer experiences across digital and in-store channels.

We are looking for an experienced Senior C#/.NET Full Stack Engineer to join our team and help build scalable, secure, and high-performance software solutions across our platform, products, and business operations.

In this role, you will work across backend, frontend, cloud infrastructure, and deployment workflows, helping us deliver reliable enterprise-grade systems for modern omni-channel retail and POS experiences.

Responsibilities

As a Senior C#/.NET Full Stack Engineer, you will:

• Design, develop, and maintain scalable, secure, and high-performance applications using C# and .NET technologies.
• Build and maintain backend services, business logic, APIs, and application workflows that support PredictSpring’s platform and product operations.
• Develop and implement RESTful APIs to connect frontend applications, backend services, third-party systems, and internal tools.
• Work with cloud-based infrastructure on AWS and Azure to support scalable, reliable, and production-ready systems.
• Containerize applications using Docker and support deployment and orchestration workflows using Kubernetes.
• Collaborate with cross-functional teams, including product, engineering, design, operations, and business stakeholders, to deliver high-quality software solutions.
• Troubleshoot, debug, and optimize applications for performance, reliability, scalability, and maintainability.
• Write clean, efficient, maintainable, and testable code following software engineering best practices.
• Participate in code reviews, technical discussions, architecture decisions, and continuous improvement of development standards.
• Implement and improve CI/CD pipelines to streamline build, testing, deployment, and release processes.
• Ensure security, data protection, and reliability across applications, services, APIs, and cloud environments.
• Work with SQL and NoSQL databases to design, query, optimize, and maintain data-driven application features.
• Stay current with modern software engineering, cloud, DevOps, and full stack development practices, and apply relevant improvements to PredictSpring’s platform and operations.

Requirements

We are looking for someone with:

• Excellent communication skills, including fluent verbal English, with the ability to explain technical concepts clearly and collaborate effectively across distributed teams.
• Bachelor’s or Master’s degree in Computer Science, Software Engineering, Information Technology, or a related field.
• Proven experience as a Full Stack Engineer or Full Stack Developer, with strong hands-on experience in C# and .NET technologies.
• Strong experience designing, building, and maintaining scalable backend systems, APIs, and enterprise-grade applications.
• Solid understanding and hands-on experience with AWS and Azure cloud services.
• Expertise in containerization and orchestration technologies such as Docker and Kubernetes.
• Strong experience with SQL and NoSQL databases, such as SQL Server, MongoDB, or similar technologies.
• Experience building and consuming RESTful APIs and integrating frontend and backend systems.
• Familiarity with frontend technologies such as JavaScript, React.js, Angular, or similar frameworks.
• Strong understanding of software architecture, clean code principles, debugging, performance optimization, and maintainable system design.
• Knowledge of version control systems such as Git.
• Familiarity with agile development methodologies, sprint-based workflows, and collaborative engineering practices.
• Experience with CI/CD processes and modern deployment pipelines.
• Strong problem-solving skills and the ability to analyze, debug, and resolve complex technical issues.

Preferred Qualifications

Nice to have:

• Experience with microservices architecture and distributed system design.
• Experience with serverless computing and cloud-native application development.
• Familiarity with DevOps practices and infrastructure-as-code tools such as Terraform.
• Understanding of cloud-native security services, application security, authentication, authorization, and data protection best practices.
• Experience with testing frameworks, including unit testing, integration testing, and UI testing.
• Experience working with high-traffic, scalable, customer-facing SaaS or enterprise platforms.
• Experience supporting production systems, monitoring application health, and improving reliability over time.
• Experience in retail, e-commerce, omni-channel commerce, or POS technology is a strong plus.

Why PredictSpring?

• Join a market-leading company shaping the future of omni-channel retail and modern POS.
• Work on high-impact engineering challenges at the intersection of commerce, cloud technology, and customer experience.
• Collaborate with a talented global team in a flexible remote work environment.
• Enjoy opportunities for growth, learning, and professional development.
• Contribute to products used by some of the world’s most recognized retail and lifestyle brands.
• Be part of an innovative, collaborative, and engineering-driven culture focused on building reliable, scalable, and measurable business value.

Join Whitechain — Build the Future of Web3!

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 ambitious innovators to help us bridge the gap between retail and corporate blockchain adoption. If you’re passionate about decentralization, Web3, and shaping the future of digital economies, this is your chance to make an impact!

The future of Web3 starts with you — join us as a Senior General QA Engineer!

What we look for (Requirements):

— 5+ years of experience in Quality Assurance;
— At least 2 year of experience testing Web3 products or chains (L1/L2 blockchain, protocols, smart contracts);
— Experience with test automation (framework setup and maintenance);
— Experience working with analytics and monitoring/observability tools;
— Strong understanding of SDLC, STLC, and release management processes;
— Solid knowledge of API testing tools and practices;
— Proficiency in SQL for data validation and analysis;
— Experience in setting up and implementing QA processes from scratch or significantly improving existing ones;
— Experience working with CI/CD pipelines (test integration, pipeline configuration);
— AI Agentic experience (Claude Code / Codex / other agentic tooling);
— Practical experience creating and maintaining test cases, checklists, and bug reports in Jira and/or Qase;
— Demonstrated ability to mentor and support QA colleagues;
— Strong analytical, communication, and leadership skills;

Will be a plus:

— Experience with performance and load testing;
— Experience in security testing;
— Python experience;

What you will do:

— Own QA processes across all Whitechain products: define, implement, and continuously improve standards and best practices;
— Test Web3 products: blockchain functionality, wallet integrations, bridge, RPC, and smart contracts;
— Perform functional, regression, smoke, UAT, and exploratory/ad-hoc testing;
— Analyze logs, network requests, and blockchain explorer data to investigate defects;
— Create, maintain, and update test cases, checklists, and QA documentation;
— Document and track defects in bug tracking systems; manage full bug lifecycle;
— Participate in refinements, planning sessions, requirement analysis, and release activities;
— Lead root cause analysis of production incidents;
— Collaborate closely with Product, Development, and DevOps teams;
— Analyze test results, track quality metrics, and report QA status to stakeholders;
— Define and drive automation strategy; promote integration of automated tests into CI/CD;
— Mentor and provide guidance to the QA Engineers; support knowledge sharing within the team;

What we offer:

Immerse yourself in Crypto & Web3:

— Shape the Future 

— Work on high-impact blockchain products at the forefront of Web3.
— Innovate & Create 

— Your ideas drive real-world solutions and technological breakthroughs.
— Global Reach 

— Build scalable solutions for businesses and users worldwide.
— Web3-Powered Culture 

— A team of visionaries who believe in decentralization and innovation.
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.

👉 Ready to disrupt the industry with us? Apply now and let’s build the decentralized future together!

Role Overview

We are seeking a high-caliber Senior RF Systems Engineer to lead the development of next-generation situational awareness and electronic warfare (EW) platforms. You will be responsible for the full lifecycle of RF subsystems, from initial research (TRL 1) to field-tested operational prototypes (TRL 7+). Your work will directly impact projects such as autonomous drone detection, FHSS signal classification, and distributed SIGINT mesh networks.

Key Responsibilities

RF Design & Integration

• Design and optimize RF front-ends for unmanned aerial systems (UAVs) and ground-based detection stations.
• Develop hardware and firmware for high-speed FHSS (Frequency Hopping Spread Spectrum) detection and mitigation.
• Architect and implement Mesh Networking protocols for distributed sensor arrays (e.g., FPV-borne SIGINT mesh).

Signal Intelligence (SIGINT) & Electronic Warfare

• Develop algorithms for passive RF geolocation and signal classification.
• Engineer solutions for Drone Detection, focusing on identifying digital and analogue transmitting signatures even under heavy jamming.
• Design and test spoofing detection systems for Galileo and GPS navigation.

Field Validation & Testing

• Lead field testing of RF prototypes in relevant operational environments to validate TRL exit criteria.
• Analyze battlefield RF signatures to refine "kill zones" and improve EW training simulators.
• Collaborate with the software team to integrate RF data into C2 (Command and Control) dashboards.

Technical Requirements

SDR Mastery

Expert proficiency with Software Defined Radio platforms (HackRF, BladeRF, Ettus USRP) and GNU Radio.

Signal Processing

Deep understanding of digital modulation (OFDM, FSK), FFT analysis, and hopping pattern reconstruction.

Hardware

Experience with PCB layout for RF applications (up to 6GHz), antenna design, and impedance matching.

Frequency Bands

Experience working across 300–600 MHz (FHSS), 2.4 GHz, and 5.8 GHz bands.

Tools

Proficiency in MATLAB/Simulink, Python, or C++ for real-time signal analysis.

• Proven experience with SAW (Surface Acoustic Wave) filters and LNA (Low-Noise Amplifier) design/integration.

Preferred Qualifications

• Knowledge of FPGA development for low-latency signal processing (Verilog/VHDL).
• Background in military-grade communication protocols and LPI/LPD (Low Probability of Intercept/Detection) systems.

Logistics & Impact

• Location: Kyiv (Hybrid/Field testing required).

Our client is a performance rights organization in the United States. It collects blanket license fees from businesses that use music, entitling those businesses to play or sync any songs from the client’s repertoire of over 22.4 million musical works. On a regular basis, the client distributes the money to songwriters, composers, and music publishers as royalties to those members whose works have been performed.

Requirements:

• 5+ years of experience in developing full-stack applications
• Experience with React frameworks such as Redux and React Router
• Experience with Java, Spring Boot, and RESTful API development
• Experience with cloud services and containerization using Azure and Docker
• Familiarity with integrating Payment Gateways and CRM systems
• Understanding of SQL and and NoSQL databases
• Knowledge of implementing Single Sign-On (SSO) using OKTA or similar authentication providers
• Good Understanding of SDLC process, version control, code review, continuous integration and automated deployment tools
• Experience working on large-scale, production-grade projects
• Knowledge of CI/CD methodology
• Strong communication and collaboration skills
• Problem-solving skills with the ability to tackle challenges proactively and efficiently
• B.Sc in Computer Science is an advantage
• Advanced level of English

Job responsibilities:

• You will be part of a team responsible for integrating payment gateways and Customer Relationship Management (CRM) system
• Collaborate with team members to design, develop, and deploy dynamic and responsive fullstack applications using React and Java
• Participate in the integration of payment gateways and CRM systems, ensuring seamless operation and data flow
• Contribute to the development of scalable and secure software systems, utilizing both SQL and NoSQL databases
• Assist in the deployment of applications on cloud services, such as Azure Kubernetes Service (AKS), and manage containerized applications using Docker
• Implement testing strategies including unit, integration, and automation tests to ensure the delivery of high-quality code
• Work with product management and UX/UI teams to deliver user-centric designs and features
• Maintain comprehensive technical documentation, including code structure, API documentation, and user guides
• Communicate effectively with cross-functional teams and stakeholders
• Stay updated on new technologies and methodologies to ensure continuous improvement of the development process

About the role 

We are looking for a strong Senior / Lead Full-Stack Platform Engineer to join a technically complex cryptocurrency product environment. This role is not for someone who only completes tasks based on specifications. We need a full-cycle engineer who can independently design, build, review, and bring solutions to production level. The ideal candidate can think beyond the codebase, understand architecture, product and technical risks, and make responsible decisions around security, scalability, stability, observability, testability, and long-term system maintenance. This role involves working across mobile, web, desktop, backend, infrastructure services, data processing systems, cryptocurrency business logic, wallet infrastructure, and blockchain integrations.

What you’ll do (day to day) 

• Design, develop, and maintain complex full-stack and platform solutions.
• Work with React, TypeScript, C#/.NET, backend services, and modular/plugin-based architecture.
• Build and improve cryptocurrency products, wallet infrastructure, and blockchain-related systems.
• Develop production-ready solutions with focus on security, reliability, scalability, performance, and maintainability.
• Work on mobile, web, desktop, backend, infrastructure, and data-processing systems.
• Analyze technical risks and make independent engineering decisions.
• Design APIs, service/module contracts, and scalable system components.
• Work with performance-critical parts of the system and optimize bottlenecks.
• Ensure proper logging, monitoring, observability, tracing, and production diagnostics.
• Write clean, maintainable, testable code with strong engineering standards.
• Use AI tools and AI agents effectively to accelerate development.
• Set clear tasks for AI agents, review AI-generated code, and control the quality of results.
• Participate in architecture discussions, code reviews, testing strategy, CI/CD, and production support.

What you’ll need 

• Strong commercial development experience in real production systems.
• Confident knowledge of React, TypeScript and/or C#/.NET.
• Experience designing architecture, not only implementing ready-made tasks.
• Strong understanding of OOP, SOLID, DRY, KISS, YAGNI, design patterns, and clean code principles.
• Good knowledge of asynchronous programming, multithreading, race conditions, deadlocks, thread safety, and background jobs.
• Understanding of memory management, object lifecycle, resources, and IDisposable.
• Knowledge of data structures, algorithms, Big O complexity, collections, queues, dictionaries, and caching.
• Experience with HTTP, REST APIs, WebSocket, RPC approaches, JSON, binary formats, and backward compatibility.
• Experience with databases, SQL, indexes, transactions, locks, and query optimization.
• Understanding of application security: validation, secrets management, authentication, authorization, and common vulnerabilities.
• Experience with unit, integration, and e2e testing, mocking, and testability by design.
• Experience with Git, CI/CD, code review, and branching strategies.
• Ability to diagnose production issues using logs, metrics, monitoring, tracing, and profiling.
• Understanding of error handling, retry policies, idempotency, graceful degradation, and migration strategy.
• Ability to work independently in uncertain and fast-changing environments.
• Strong ability to use AI tools practically in development, not only as code completion.
• Ability to critically review AI-generated code and architectural suggestions.
• Strong attention to detail, responsibility, and engineering thinking.
• Russian language proficiency. - not for djinni

Nice to have

• Experience in crypto, fintech, wallets, blockchain, or payment infrastructure.
• Experience with plugin-based or modular architecture.
• Experience developing mobile, desktop, or cross-platform applications.
• Experience with high-load systems, data processing, and performance optimization.
• Experience building internal platforms, SDKs, infrastructure services, or developer tools.
• Experience as a Lead Engineer, Tech Lead, Staff Engineer, or Architect.
• Strong backend experience with C#, .NET runtime, ASP.NET Core, dependency injection, middleware, hosted services, EF Core, ADO.NET, configuration, options pattern, health checks, and secure secrets management.
• Strong frontend experience with TypeScript, React, hooks, state management, routing, forms, validation, API error handling, UI performance optimization, frontend architecture, and frontend testing.

What Company offers 

•  A friendly, creative team where you own your work 
• Competitive compensation package.
•  All the tools and tech you need 
• Dynamic, fast-paced international environment.
• Long-term career growth opportunities within a rapidly expanding company.