Jobs

Proactive and results-driven Account Manager to manage and develop relationships with VIP players. The role focuses on retention, revenue and deposit growth, and delivering a high-quality, personalized customer experience.

Key Responsibilities

• Build and maintain strong relationships with VIP players
• Act as the main point of contact for assigned accounts
• Monitor player activity and proactively engage to increase retention and lifetime value (LTV)
• Identify player needs and provide tailored offers, bonuses, and experiences
• Execute and optimize VIP campaigns and promotions
• Track player behavior, segmentation, and performance metrics

Requirements

• Experience in VIP Account Management, VIP Management  in iGaming. 
• Strong communication and relationship-building skills
• Analytical mindset with the ability to interpret player data
• Experience working with CRM tools (e.g., Zendesk, Voiso)
• Ability to manage multiple accounts and prioritize effectively
• Fluent in Spanish (English are a plus)
• Flexibility to work in shifts if required

Key Skills

• Relationship management
• Negotiation and upselling
• Customer retention strategies
• Data-driven decision making
• Problem-solving and conflict resolution

About the Product:

Cynet is a unified, AI-powered cybersecurity platform that autonomously detects, protects, and responds to threats across Windows endpoints.

The core product is a Windows EDR agent that runs on hundreds of thousands of devices, offering real-time detection, prevention, and response with minimal resource impact.

Built for organizations of all sizes, it consolidates threat detection, response, and compliance into a single agent and console, backed by 24×7 MDR experts.

The platform addresses the industry challenge of growing cyber threats by delivering fast, accurate protection without noise or complexity.

About the Role:

As a Windows C++ Developer, you will join the award-winning Windows EDR team and drive low-level development on the heart of Cynet’s protection platform.

You will design and implement core components in a user-mode, multithreaded environment, owning features end-to-end from architecture through deployment.

Your work will directly impact hundreds of thousands of Windows endpoints, shaping detection and prevention capabilities and ensuring product stability at scale.

This role combines deep technical challenges in Windows internals, performance tuning, and real-time programming with cross-team collaboration among security researchers, product managers, and support engineers.

You will have autonomy to propose solutions, influence architectural decisions, and take ownership of critical features that define the product’s competitive edge.

Key Responsibilities:

• Design and implement user-mode services and low-level components for the Windows EDR agent
• Develop multithreaded applications with thread synchronization and real-time constraints
• Collaborate with security researchers to translate detection rules into code
• Own feature lifecycle: design, coding, performance tuning, and integration
• Debug escalated customer issues, analyze logs, and perform remote debugging sessions
• Conduct code reviews and ensure adherence to OOP and clean coding principles
• Write and maintain unit tests and automation scripts within the existing framework
• Optimize memory management, I/O performance, and resource usage for large-scale deployments
• Participate in sprint planning, PI design sessions, and architectural discussions

Required Competence and Skills:

• 4+ years of experience in C++ development on Windows (modern C++17/20/23 – an advantage)
• Deep understanding of Windows OS internals and Windows API
• Proven experience with multithreaded programming, synchronization, and real-time constraints
• Strong software design, OOP, and clean coding practices
• Expertise in memory management and I/O performance optimization
• Proficient debugging skills, including remote debugging and log analysis
• Familiarity with smart pointers (shared_ptr, unique_ptr) and move semantics
• Experience writing unit tests and integrating automation tests

Nice to Have:

• Kernel-mode development experience
• Background in reverse engineering or malware analysis
• Prior experience in security-oriented software development
• IDF Cyber Unit alumni

About us

Rewire Solutions builds AI and cloud-based solutions for international clients. We are looking for motivated engineers of different levels to join our remote team.

We offer

• Remote work
• B2B contract
• Flexible schedule
• International projects
• Long-term cooperation

Requirements depend on level.

Client is looking for specialists from Junior to Senior level.

Required experience

• Experience with AI tools and LLM platforms
• Claude AI / ChatGPT / Gemini / other AI systems
• Building AI chat solutions
• AI agents and multi-agent workflows
• Prompt engineering
• AI automation
• API integrations
• Experience with modern AI ecosystems

Nice to have

• LangChain / LlamaIndex
• Vector databases
• OpenAI Assistants API
• RAG systems
• AI copilots
• Workflow automation
• Cloud AI infrastructure

Send us:

• CV
• Portfolio
• Short intro about yourself on English

Description

The Digital Health organization is technology team which focused on next generation Digital Health capabilities which deliver on the Medicine mission and vision to deliver Insight Driven Care. This role will operate within the Digital Health Applications & Interoperability subgroup of the broader Digital Health team, focused on patient engagement, care coordination, AI, healthcare analytics & interoperability amongst other advanced technologies which enhance our product portfolio with new services, while improving clinical & patient experiences.

Requirements

MUST HAVE

• AWS Platform: Working experience with AWS services – in particular serverless architectures (S3, RDS, Lambda, IAM, API Gateway, etc…) supporting API development in a serverless architecture

• Programming Languages: Python (strong programming skills)

• Data Formats: Experience with JSON, XML and other relevant data formats

• CI/CD Tools: experience setting up and managing CI/CD pipelines using GitLab CI, Jenkins, or similar tools

• Scripting and automation: experience in scripting languages such as Python, PowerShell, etc…

• Monitoring and Logging: Familiarity with monitoring & logging tools like CloudWatch, ELK, Dynatrace, Prometheus, etc…

• Source Code Management: Expertise with git commands and associated VCS (Gitlab, Github, Gitea or similar) 

NICE TO HAVE

• Strongly Preferred: Infrastructure as Code: Experience with Terraform – Proven ability to write and manage Infrastructure as Code (IaC)
• Documentation: Experience with markdown and, in particular, Antora for creating technical documentation
• Experience working with Healthcare Data, including HL7v2, FHIR and DICOM
• FHIR and/or HL7 Certifications
• Building software classified as Software as a Medical Device (SaMD)
• Understanding of EHR technologies such as EPIC, Cerner, etc.
• Experience implementation enterprise grade cyber security & privacy by design into software products
• Experience working in Digital Health software
• Experience developing global applications
• Strong understanding of SDLC – Waterfall & Agile methodologies
• Software estimation
• Experience leading software development teams onshore and offshore

About the project:

The Client provides comprehensive operational support and a range of expert services to the world’s leading insurers, brokers, fleet managers and automotive manufacturers. 3,300 employees across ten countries deliver exceptional standards on a large scale for over 1,200 clients. We help the global insurance market to handle millions of claims each year in the most cost-effective and efficient ways possible. The Client is embarking on an exciting and challenging transformation program and our software solutions are a driving force behind this strategy using cloud computing and leading-edge design patterns.
This is AI First project with massive usage of AI DLC practices.

Key Responsibilities:

• Writing automated test scripts to verify and validate that the new software meets the business needs
• Gaining a strong understanding of the business operation
• Recording and monitoring QA test results 
• Enhancing existing automation back end and front end framework 
• Providing coaching support to others in the QA team
• Providing QA effort estimates in work refinement sessions
• Helping to drive the test automation strategy across the business
• Running performance tests and ensuring that the results meet established levels
• Assisting in the user acceptance test (UAT) process by helping end users understand how to use the software
• Test planning activities and stream ownership
• AI driven mindset and readiness.

• Be an active member of the Scrum team, improving processes and ensuring that the team delivers on their commitment

   

Knowledge and Skills required:

• 5+ years of experience in testing
• Eng (b2+), Spanish (b1) - optional but favorable
• .NET + Resharp
• TypeScript _ Playwright 
• Test data creation
• Rest and Soap Api Testing 
• Exploratory Testing
• Git
• AI DLC practices (MCP servers, .md files, ecosystem building)
• Knowledge of current industry-wide quality & test processes, practices, tools and techniques.
• Self-organizing problem solver with the ability to think outside the box.
• Works effectively with both local and remote colleagues, collaborating, motivating, and energizing others.
• Excellent verbal and written communication skills with strong attention to detail.
• Continuously looking to improve and learn new technologies, participating actively in the development community, contributing to blogs, researching or Opensource.

• Enjoys working in a fast-paced environment.

   

Experience required:

• Previous experience working in medium to large sized development teams.
  Working on enterprise level customers
• Experience working in an agile environment employing scrum methodology and JIRA as a SDLC management tool.
• AI mindset is much preferable.

About Klik

Klik is a technology services company delivering custom software development, application modernization, and ongoing technical support to clients. We hire senior, dependable engineers who can own their work, communicate clearly, and build long-term trust with both our team and our clients.

About the Role

Senior ColdFusion Developer will join our team on a long-term contract basis and support a key client engagement. You will be the lead hands-on developer on a custom ColdFusion web platform that serves a large, distributed user base, with role-based access for end users, regional officers, executive committees, and administrative staff.

The platform sits on top of a Microsoft SQL Server back end and supports an active queue of new features, form updates, reporting needs, and bug fixes. The ideal candidate is someone who can hit the ground running, work autonomously from well-written tickets, and steadily work through the backlog while maintaining high engineering discipline on a live production system.

Key Responsibilities

• Develop, maintain, and enhance an existing production ColdFusion web application.

• Design and build new pages, web forms, and submission workflows based on business requirements.

• Write and optimize T-SQL queries and reports against a Microsoft SQL Server back end, including data exports to Excel.

• Investigate, diagnose, and resolve bugs and production issues.

• Coordinate with the client’s in-house database team for any schema or data changes.

• Contribute to source control discipline using Git / GitHub, including branching, pull requests, and code review.

• Provide realistic effort estimates, flag risks early, and participate in weekly or bi-weekly planning meetings.

• Communicate clearly and professionally with client stakeholders in English, both in writing and on calls.

Required Qualifications

• 5+ years of senior-level hands-on Adobe ColdFusion / CFML development experience on production web applications.

• Strong Microsoft SQL Server and T-SQL skills: complex queries, joins, stored procedures, and basic performance tuning.

• Solid front-end fundamentals: HTML, CSS, and JavaScript; comfortable with form-heavy, role-based web applications.

• Hands-on experience with Git and GitHub (or GitLab) for source control and collaborative development.

• Excellent written and spoken English — able to read tickets independently, ask clarifying questions, and present status confidently.

• Self-directed senior mindset — able to take a well-written ticket and deliver without needing day-to-day hand-holding.

• Disciplined, production-aware engineer — careful with changes on live systems and methodical about verification.

• Reliable internet connection and a professional remote working setup.

• Available to work US Eastern Time business hours through at least 2:00 PM EST every working day (from 12.00 to 20.00 Kyiv time).

Preferred Qualifications

• Experience supporting non-profit, membership, or association-based organizations.

• Experience modernizing or migrating legacy ColdFusion applications to modern stacks such as .NET, Node.js, or Java.

• Experience working in environments with limited test infrastructure, where production discipline matters.

• Familiarity with Smartsheet, Jira, or other sprint / work-management tools.

• Prior experience working remotely with US-based clients on long-term engagements.

What We Offer

• A long-term, stable contract engagement (12+ months expected) with steady weekly hours.

• Approximately 30–40 hours per week initially, with the ability to flex based on workload.

• Direct ownership of meaningful, visible work — not commodity ticket churn.

• Supportive technical onboarding from an experienced developer already on the project.

• A clear, well-managed backlog with regular planning cadence.

• Opportunity to influence longer-term platform modernization decisions.

• Fully remote work; no travel required.

How to Apply

To apply, please send the following:

• An up-to-date CV / resume highlighting your ColdFusion and SQL Server experience.

• A short cover note describing one ColdFusion project you led and what made it challenging.

• Your earliest start date and weekly availability.

• Your expected hourly rate in USD.

• Your time zone and confirmation that you can cover working hours from 12.00 to 20.00 Kyiv time.

Klik is an equal-opportunity employer. We welcome applications from qualified candidates of all backgrounds, locations, and time zones, provided the working-hours overlap requirement can be met.

We are helping our partner — a fast-growing product company in the iGaming space — find a Senior Java Developer to join their backend team.

This is not a “just write code” role.

This is about building systems, making decisions, and owning the result.

What this role is really about

You’ll be working on a high-load casino product, where:

• systems process real-time events
• performance matters
• architecture decisions have real impact

The team builds services from scratch and owns them end-to-end.

What you’ll be doing

• Build new backend services from scratch
• Participate in architectural and technical decisions
• Work with microservices and distributed systems
• Solve complex technical challenges
• Collaborate in a cross-functional team (product / QA / dev)
• Take ownership of what you build — not just tasks

What we’re looking for

• 5+ years of experience with Java
• Strong experience with microservices architecture (2+ years)
• Deep understanding of distributed systems
• Hands-on experience with:
  • Spring Boot
  • PostgreSQL
  • Kafka (or similar messaging systems)
  • SQL + NoSQL databases
• Experience with AWS / Kubernetes will be a strong plus
• gRPC — nice to have

But more importantly:

You think, not just code

You take ownership

You can explain your decisions

What you get

• Product company (not outsourcing)
• Real impact on architecture and product
• Strong engineering team
• Fast-paced environment with real challenges
• Remote work

About the Role

We are seeking a highly skilled and mission-driven Data Scientist to join our customer team and lead the development of our Patient Risk Scoring machine learning initiatives. In this role, you will build predictive models that identify high-risk patients for interventions, ultimately improving patient outcomes and optimizing care delivery. You will leverage Microsoft Fabric to manage end-to-end machine learning workflows, drawing insights from Electronic Health Record (EHR) data sources. If you are passionate about the intersection of advanced artificial intelligence and healthcare innovation, we want to hear you.

Responsibilities

• Model Development & Deployment: Design, train, evaluate, and deploy machine learning models to predict patient risk scores (e.g., medication refusal, non-compliance, decompensation etc.).
• EHR Data Engineering & Processing: Extract, clean, and transform healthcare data from EHR systems (e.g., Credible) to build robust feature sets for predictive modeling.
• End-to-End Analytics with Microsoft Fabric: Utilize Microsoft Fabric’s unified analytics platform (including Data Engineering, Data Science, and Real-Time Analytics workloads) to orchestrate data pipelines, manage Lakehouse architectures, and scale ML training/inference.
• Clinical Collaboration: Partner closely with clinical stakeholders, medical officers, and care teams to define risk cohorts, ensure the clinical validity of model features, and translate model outputs into actionable clinical workflows.
• MLOps & Monitoring: Establish continuous integration, deployment, and monitoring of ML models to track data drift, model degradation, and fairness/bias over time.
• Compliance & Privacy: Ensure all data handling and modeling practices strictly adhere to healthcare regulations (e.g., HIPAA, HITRUST) and maintain the highest standards of data security and patient privacy.

Qualifications

• Education: Bachelor’s or Master’s degree in Data Science, Computer Science, Statistics, Bioinformatics, Health Informatics, or a related quantitative field.
• Professional Experience: 4+ years of experience developing and deploying machine learning solutions in production environments, preferably within healthcare or clinical data ecosystems.
• Microsoft Fabric Experience: Hands-on experience building and deploying data and ML workflows within the Microsoft Fabric ecosystem (OneLake, Notebooks, Spark, Data Factory).
• Machine Learning Proficiency: Strong grasp of classical machine learning algorithms (e.g., XGBoost, Random Forests, Logistic Regression) and modern deep learning techniques, specifically for tabular and time-series data.
• Programming Skills: Advanced proficiency in Python and SQL. Experience with data manipulation and ML libraries (Pandas, PySpark, Scikit-Learn, PyTorch, or TensorFlow).
• Communication: Excellent ability to translate complex technical and statistical concepts to non-technical clinical and business stakeholders.

Nice to Have

• Cloud Certifications: Relevant Microsoft Azure or Fabric certifications.

Work Environment & Collaboration

• Full-time: 8 hours a day.
• Schedule: Mon – Fri 9-5 (US EST) overlap with team at least 4 hours.
• Team Structure: Work independently on assigned tasks with support from experienced team members.
• Communication: Primarily asynchronous via email and MS Teams.

For 15 years, Alty has reached the top lists of mobile and desktop application developers for fintech, retail, banking, and tourism. Our professional expertise in UI/UX design, mobile, and web development of high-load applications used by millions of users worldwide. You know us for sure if you use Monobank, Privat24 for Business, ZakazUA, EasyPay, Kashable, or Sfera Living System. We also have a partnership with Visa and Mastercard. Our clients are enterprises and corporations that recommend us to partners. We put the customer at the heart of all we do and achieve our best together. Join us!
 

About the Role:

We are looking for an AI Enablement Specialist — a highly proactive, cross-functional professional who will help us rethink how digital products are built, delivered, and scaled using AI.

This is not a traditional engineering or design role. Instead, we’re looking for someone who understands product development holistically — spanning business, design, and engineering — and can identify, test, and implement  AI-driven approaches that significantly improve speed, quality, and innovation.

You will play a key role in shaping how we adopt AI across workflows, from early prototyping to delivery and even sales enablement.
 

Key Responsibilities:

— Drive AI adoption and modernization across product development processes.

— Identify, test, and implement AI-powered tools and workflows to accelerate delivery.

— Actively participate in brainstorming, product discussions, and strategic decisions.

— Propose new approaches and ideas — including those the team hasn’t yet even considered.

— Facilitate strong cross-team communication between business, design, and engineering.

— Prototype solutions using modern AI tools instead of traditional workflows where applicable.

— Continuously explore and evaluate emerging AI tools and methodologies.

— Build and showcase real use cases demonstrating efficiency gains and improvements.

— Support client-facing activities and sales, helping articulate AI-driven value propositions.

— Educate and guide teams on how to effectively leverage AI in their daily work.
 

What We’re Looking For:
— Proven examples of process optimization or innovation using AI.
— Strong understanding of digital product development (across design, engineering, and business).
— Experience and deep interest in AI-enabled workflows and tools.
— Experience in pre-sales, consulting, or client interaction.
— A self-starter mindset — someone who brings ideas, not just executes tasks.
— Excellent communication and facilitation skills.
— Curiosity and drive to continuously explore, experiment, and improve.
— Ability to translate complex ideas into clear, actionable insights.
— Understanding of how businesses operate and how technology drives value.
— Experience with rapid prototyping and modern tools (LLMs, AI copilots, no-code/low-code platforms, etc.).
 

What Success Looks Like:
— Faster product development cycles through AI-driven improvements.
— Tangible examples of efficiency gains and innovation.
— Increased adoption of AI tools across teams.
— Increased number of new clients driven by improved delivery capabilities, visible innovation, faster execution, and AI-powered value delivery.
— New, unexpected ideas that push the company forward.
 

What we offer for you to succeed:

— Warm and friendly working environment with flexible start (from 8:00 to 11:00) based on personal preferences and team meetings.

— We put a healthy work-life balance first.

— Caring for physical and mental health.

— Speaking Club and English with a teacher.

— Volunteer projects that help the state get closer to victory.

— A space to grow both professionally and personally. A wide variety of exciting projects, the best hardware for your work, performance reviews, educational workshops, and team coaching.

— No tiresome bureaucracy. If you need something — just ask and get it.
 

Our employees describe working here as a welcoming, collaborative, and impactful experience. If you are a creative and energetic person, we cannot wait to see you on board!

We are looking for an AI/ML Engineer to build and scale AI-powered solutions for real-world use cases. This is a hands-on role focused on developing agentic systems, RAG pipelines and production-grade LLM integrations.

Requirements

• 4+ years of commercial development experience 
• Strong experience with LLM-based systems (RAG, agents, tools)
• Ability to design end-to-end AI architecture (data → retrieval → response)
• Experience with evaluation pipelines (golden datasets, metrics, LLM-as-judge)
• Solid understanding of prompt engineering and iteration
• Experience working with databases (Postgres) + vector search
• Understanding of data processing, PII detection, and safe data handling
• Familiarity with fine-tuning approaches (LoRA/QLoRA) and when to use them
• Ability to review and validate AI-generated code
• Strong engineering mindset (scalability, reliability, structured thinking)

Responsibilities

• Build AI-powered features using LLMs (Claude, OpenAI, etc.)
• Develop and optimize RAG pipelines
• Create AI agents and autonomous workflows
• Fine-tune and adapt ML/LLM models for specific use cases
• Integrate AI solutions into products via APIs
• Collaborate with the team and clients to deliver production-ready solutions

We offer

• Flexible working hours
• 20 working days paid vacation and 15 sick leaves
• Fully paid medical insurance
• English classes in the office
• No time trackers — ability to do quality work
• Friendly team and enjoyable working environment

About the role

We are sourcing a senior payments engineer for a US fintech client running a number of card tokenization deployments. The work centers on Mastercard Digital Enablement Service (MDES) and Visa Token Service (VTS) integrations — payment credential tokenization, lifecycle management, network certification, and supporting infrastructure for fintech rollouts.

This is not a generic "fintech experience" role. We are specifically looking for engineers who have shipped MDES or VTS in production, ideally at a card issuer, processor, or BaaS platform.

What you will work on

Card network tokenization flows (MDES and/or VTS) Token provisioning, lifecycle, and de-tokenization Network certification and compliance work Integration with card management systems, HSMs, and issuer/processor APIs Cross-functional work with payments product, risk, and infrastructure teams

Required

5+ years in payments engineering Production experience with MDES or VTS (not adjacent, not "exposure" — actual ship-to-prod work) Strong backend engineering (Java, Go, Python, or Node.js depending on stack) Familiarity with PCI DSS scope, HSM integration patterns, tokenization standards Comfortable working directly with a US-based product team in their working hours (some overlap required)

Nice to have

Background at Mastercard, Visa, Marqeta, Galileo, Stripe Issuing, Adyen, Thredd, GPS, Worldpay, Fiserv, or a similar issuer/processor/BaaS EMV / 3DS / ISO 8583 working knowledge Experience with Apple Pay / Google Pay / Samsung Pay provisioning flows Card issuing background (BIN sponsorship, KYC integrations, dispute flows)

Engagement details

Start: ASAP (within 2-3 weeks of selection) Duration: Multi-deployment scope, initial commitment 3-6 months with strong likelihood of extension Mode: Embedded full-time (40h/week) or senior project consulting (20-30h/week) depending on your availability Working hours: Some overlap with US Eastern timezone required (at least 3-4 hours)

How to apply

Reply with your CV and a short note covering:

1. The specific MDES or VTS production work you have shipped (network, issuer, processor, what role you played)
2. Your current availability and earliest possible start date

Thank you. 

We are looking for a Python Developer with 4+ years of commercial experience to join our engineering team and work on scalable, production-ready solutions for international projects.

You’ll collaborate with experienced developers, participate in architecture discussions, and build reliable backend services using modern technologies and best engineering practices.

Requirements

• 4+ years of commercial Python development experience
• Strong knowledge of Python and OOP principles
• Experience with FastAPI, Django, or Flask
• Experience building REST APIs and backend services
• Good understanding of SQL and relational databases (PostgreSQL/MySQL)
• Experience with Docker and containerized environments
• Familiarity with CI/CD processes
• Experience with Git
• Understanding of software architecture and clean code principles

• Upper-Intermediate English

   

Nice to Have

• Experience with AWS/GCP
• Experience with Kubernetes
• Knowledge of async programming
• Experience with Redis, Celery, RabbitMQ, or Kafka
• Understanding of microservice architecture

• Experience with automated testing

   

Responsibilities

• Develop and maintain backend services and APIs
• Design scalable and maintainable solutions
• Participate in code reviews and technical discussions
• Optimize application performance and reliability
• Collaborate with cross-functional teams
• Contribute to architecture and product improvements

We Offer

• Real production projects
• Flexible working format
• Strong engineering culture
• Professional growth opportunities
• Modern technology stack
• Opportunity to influence technical decisions

NeduAI is a Finnish GovTech startup at the intersection of education and public sector service delivery. We're building SmartProfile — a "neural hub" connecting skills, jobs, and education — replacing static resumes and outdated job boards with a data-driven, human-centered career ecosystem.

We partner with Finnish municipalities (Vantaa, Kotka), Unemployment Funds (A-kassa), Trade Unions, and educational institutions (XAMK, Laurea). You're joining at a critical scaling phase as we expand from Finland to a broader Nordic presence.

What you'll own:

• Lead the engineering team, set best practices, and own the technical roadmap
• Drive migration from AWS/Azure to EU-based sovereign infrastructure
• Manage PostgreSQL + Vector store architecture powering ML features and RAG capabilities
• Ensure GDPR & AI Act compliance, OAuth/MFA, data encryption
• Architect and scale RESTful APIs integrating SmartProfile with client systems
• Lead development of Assistant PRO — an AI agent for public sector administrators

What we're looking for:

• Proven experience leading technical teams
• Expert backend development (Python, Node.js, or Go) + distributed systems
• Kubernetes, containerization, production workloads (99.5%+ SLA)
• AI integrations, Vector Databases + PostgreSQL
• LLM fine-tuning, monitoring, and agentic workflow experience
• OAuth 2.0, encryption protocols, data privacy regulations
• Automated testing and monitoring/DevOps practices

We’re looking for a Senior Full Stack Engineer to join a Web3 project.

The project is based on ZK-proof technology (zero-knowledge proofs), enabling decentralized verification of user attributes without directly exposing personal data.

Responsibilities:

• Design, develop, and implement blockchain solutions using Node.js, JavaScript, and TypeScript, following clean code principles
• Collaborate with the team to define project requirements and architecture for blockchain-based applications
• Integrate blockchain functionality into new and existing systems and applications
• Perform code reviews and ensure the quality and security of the developed software
• Develop and maintain tests for components
• Collaborate with other developers and stakeholders to identify and implement improvements.

Professional requirements:

• Strong knowledge of JavaScript/Typescript, with a focus on writing clean, maintainable code
• 3+ years of commercial experience as a full-stack engineer with NodeJS (NestJS)
• Strong understanding of the event loop in Node.js and its implications on application performance and scalability
• 2+ years of commercial experience with ReactJS/Next.js
• Familiarity with asynchronous programming concepts, including Promises and async/await
• Experience with optimizing code performance and addressing blocking and concurrency issues in event-driven systems
• Solid understanding of blockchain technology, cryptographic principles, and decentralized systems
• Experience with viem, ethers.js or similar libraries for interacting with blockchain networks
• Strong problem-solving skills and the ability to troubleshoot complex issues;
• Proficiency in writing unit tests, integration tests, and end-to-end tests for Node.js and blockchain components
• Experience with PostgreSQL databases and query languages (e.g. SQL)
• Familiarity with database design and optimization principles

Will be a plus:

• Experience in designing and maintaining SDKs and public-facing components
• Understanding of, or hands-on experience with, decentralized or multi-party protocols
• Solid understanding of zero-knowledge proofs (ZKPs) and their applications

We offer:

• Competitive compensation
• Social package (24 working days of annual leave, 5 paid sick days)
• Flexible working hours
• Challenging projects in diverse business domains and a variety of tech stacks
• Personal development and professional growth opportunities
• Work with talented, ambitious and family-feel teams
• Educational possibilities: corporate courses, knowledge hubs, and in-house English classes
• Compensation for your professional certification & support for your learning activities
• Opportunity to choose IT equipment you like
• Corporate social responsibility

Project overview 
Group107 is looking for a Senior Desktop Systems Engineer to join a client project - Othello, a SalesTech startup building a real-time AI platform that empowers sales professionals to succeed in every conversation. The platform integrates with calendar, email, and CRM, delivering smart pre-meeting insights, live in-call guidance, and post-call performance analysis (buyer sentiment, action items, recommendations).
 

You will join an early-stage, well-funded team (pre-seed at $20M valuation, backed by Long Journey Ventures and founders of DoorDash, Axonius, Exodigo, and Chime) at a critical moment — just before the seed round — with enterprise pilots already running with companies of $10B+ market cap, including U.S. Steel.

     Responsibilities

• Build and improve a high-performance desktop application across macOS and Windows
• Own OS-level behavior including window management, lifecycle, background processes, system events, permissions, notifications, installers, auto-updates, and device or app integrations
• Design and implement native modules and system-level integrations where needed
• Work across Electron, native code, and desktop architecture to push the product far beyond a typical web app in a shell
• Help define how the application is structured across processes, IPC boundaries, native capabilities, and the frontend layer
• Drive performance, responsiveness, stability, and correctness across the desktop stack
• Contribute to product experience and interaction quality, especially where desktop behavior directly shapes UX

• Take full ownership of complex desktop problems end-to-end, from architecture to delivery, with minimal supervision

   

  Requirements

• 8+ years of professional software engineering experience
• 3+ years of hands-on experience building production desktop applications
• Strong experience building desktop software on macOS and/or Windows
• macOS: Advanced knowledge of Swift (Objective-C is a plus)
• Windows: Strong experience with Rust or C++ (C# is acceptable)
• Deep understanding of operating system behavior and desktop application architecture
• Strong grasp of system-level concerns: process architecture, memory and CPU usage, IPC, permissions, windowing, file system access, auto-updates, and OS integrations
• Ability to reason about low-level implementation details while keeping product quality high
• Experience designing software that feels truly native on macOS and Windows
• Experience with Electron in production
• Solid React knowledge and frontend sensibility
• Strong engineering judgment, problem-solving ability, and high execution standards
• Ability to look at the product from a user perspective and care deeply about responsiveness, smoothness, and correctness
• English — Advanced (C1) or higher

     Soft Skills

• Very strong written and verbal communication skills
• High ownership — drives problems to resolution without micromanagement
• Self-sufficient and comfortable operating with minimal task-level direction
• Strong product mindset — evaluates engineering decisions through the lens of end-user experience
• Ability to take on hard engineering problems and solve them properly
• Comfortable in an early-stage, fast-moving startup environment

     Nice to Have

• Experience publishing apps to the Mac App Store and/or Microsoft Store
• Familiarity with code signing, notarization, and update channels (Sparkle, Squirrel, etc.)
• Experience with audio/video capture, accessibility APIs, or system-wide overlays
• Exposure to AI-powered product features or real-time data pipelines
• Experience working with FastAPI / Python backends or GCP infrastructure