Jobs at Djinni

About the Role

We're looking for a sharp, analytically mindedcontractor to support our accounting team with workpaper modernization and dataquery work. This is a hands-on, execution-focused engagement suited for someonewho moves fast, works independently, and takes ownership.

Technical Requirements

 *   Advanced Excel proficiency — pivot tables, dynamic arrays, Power Query, and building structured reporting tools for high-volume datasets
 *   Advanced SQL skills — complex queries, stored procedures, window/analytical functions, and query optimization
 *   Hands-on experience with dbt, Google BigQuery, and Airflow
 *   4–6 years of hands-on experience analyzing and engineering large datasets in a business or finance context
 *   Demonstrated ability to pick up unfamiliar tools and systems quickly

Soft Skills & Work Style

 *   Highly organized with the ability to juggle multiple deliverables
 *   Strong attention to detail without losing sight of the bigger picture
 *   Self-starter who operates well with minimal oversight
 *   Collaborative — comfortable interfacing with accounting and operations teammates
 *   Professional proficiency in English (written and verbal)

Project Responsibilities 

Participate in team PBR (Product Backlog Refinement) sessions: accepting tasks from analysts, reviewing completed business research documents and PRDs together, validating requirements, and discussing technical implementation approaches before development begins. 
Integration & Fiscalization 
Design and develop integration services with external providers and government systems, implement fiscalization logic and e-invoice processing, and own your code all the way through to production release. 
Observability & Support 
Independently maintain the stability of your own solutions. Set up monitoring (metrics, logs) for the services you develop and respond to production alerts. 
Teamwork & Ownership 
Collaborative development of regulatory services. After onboarding and gaining context, we expect you to be able to independently scope, execute, and close integration tasks — such as launching fiscalization in a new country or connecting to government systems with local deployment — without micromanagement.

Candidate's Portrait

We need a self-sufficient engineer who is ready to dive deep into business context, collaborate effectively with the team, and take well-defined analyst requirements all the way to stable production code. 
The ideal candidate demonstrates strong independence, ownership, and ability to work without micromanagement. They are comfortable operating in conditions of uncertainty, proactively gathering requirements, and communicating directly with stakeholders. They should be confident in MySQL and relational databases, have practical experience with Redis, Kafka, and Nats, and be capable of designing and implementing APIs (REST, gRPC, GraphQL). Familiarity with Docker, Kubernetes, ELK stack, and CI/CD tools (GitHub Actions) is expected. Experience with AWS is a plus.

Must-haves 

Commercial Go development experience 4+ years, hands-on REST API design, and a solid understanding of core language principles (memory management, garbage collection, concurrency). 
Data & Messaging 
Experience with Kafka for asynchronous messaging, and strong proficiency with MySQL (or equivalent RDBMS) including transactions, indexing, and locking. 
Caching & Infrastructure 
Experience with Redis (caching strategies), proficiency with Docker and Kubernetes (writing and editing Helm configurations), and practical experience working with CI/CD pipelines (GitLab CI / GitHub Actions). 
English level B1+ 

Nice-to-have

Experience with AWS 
Experience in mobility / ride-hailing / logistics products 
Experience working in distributed international teams 
Experience with Prometheus / Grafana 
Facilitation and decision-making skills in architectural discussions

Why this role exists:

We're looking for a strong individual contributor who owns complex backend features end-to-end — from technical design through production delivery. You'll work independently on challenging problems, write high-quality code at scale, and raise the bar for the team by mentoring less experienced engineers and maintaining engineering standards through thorough code reviews.

What you’ll drive:

Software Architecture and Backend Development

• Design and implement scalable, resilient backend services and APIs.
• Write, test, and debug complex code across new and existing application.
• Own features end-to-end: from understanding requirements, through implementation, to production monitoring.
• Identify and resolve complex technical problems, including performance bottlenecks and architectural debt.
• Maintain comprehensive technical documentation for systems you build.

Collaboration & Mentorship

• Mentor junior and mid-level engineers through pairing, knowledge sharing, and day-to-day guidance.
• Conduct thorough code reviews to ensure quality, security, and adherence to best practices.
• Collaborate with cross-functional teams (product, design, operations) to clarify requirements and align on technical approach.
• Proactively communicate technical trade-offs and progress within the team.

What makes you a GR8 fit:

Must-have

• 5+ years of hands-on backend engineering experience with a strong track record of delivering complex systems.
• Upper-intermediate or higher level of English.
• Understanding of system design: microservices, event-driven architecture, resilient patterns, delivery guarantees, CAP theorem.
• Database knowledge: relational and non-relational databases, SQL optimization, indexing, normalization/denormalization, ACID properties, transaction isolation.
• Working knowledge of Docker, Kubernetes basics, CI/CD pipelines, and Git workflows.
• Strong problem-solving skills: ability to break down ambiguous problems, make pragmatic decisions, and communicate reasoning clearly.
• Advanced proficiency in Node.js and TypeScript, including runtime internals, event loop, async programming, and core modules.
• Advanced TypeScript: strict typing, generics, decorators, utility types, and metaprogramming patterns used in NestJS. 
• Proficiency in designing and implementing scalable RESTful APIs and microservices using NestJS (modules, providers, guards, interceptors, microservices transport, Swagger).
• Event-driven architecture: Kafka for async messaging, BullMQ for background job processing.
• Cloud & infrastructure: AWS SDK (S3, Bedrock), Docker/Docker Compose, Prometheus metrics, GitLab CI/CD

Nice-to-have

• Experience with Go or .NET.
• Experience with Strapi CMS or similar headless CMS platforms.
• Familiarity with Terraform/Terragrunt for infrastructure-as-code.

             We are looking for a Senior Embedded Software Developer  for an international company specializing in custom electronics development for embedded, industrial, and IoT applications. The company delivers innovative hardware solutions for diverse industries, including medical devices, industrial electronics, automotive, and agricultural technology.

Company size: 90+ employees 

Technical team:  Software team (PM, Tech Lead, 9 engineers)

Main projects: Full-cycle electronics design; solutions for industrial, automotive, and miltech sectors.

 Office/hybrid work mode: Ivano-Frankivsk, Lviv.

 Conditions:  Competitive salary, career and professional growth, opportunity to work on cutting-edge hardware projects, mentorship and knowledge-sharing environment, flexible schedule, military booking starting from the first working day, and other benefits.

Requirements:

• Experience in C/С++ programming of 5+ years;
• Experience in design and development of products based on RTOS and RTOS-less  

            embedded systems;

• Experience with some of the following of Ethernet protocols (TCP, UDP, DHCP, DNS, ARP, NTP, SMTP, SNMP, ICMP) and CAN protocols (J1939, CANOpen);
• Еxperience with some of the following  іn-circuit embedded interfaces: SPI, UART, CAN, I2C, I2S, SMBus, etc.
• Еxperience with  some of the following  embedded interfaces: RS 232/422/ 485 , Ethernet, USB bus, etc.
• Еxperience with  some of the following  wireless interfaces: Bluetooth, BLE , WiFi, ZigBee, etc ;
• Experience with different microcontrollers: mainly ARM Cortex- Mx based ( STM32, ATMEL, TI), ESP32, Microchip, Silicon labs (EFR and EFM series) ;
• English proficiency at B1 level or higher, both spoken and written.
• Master or Bachelor degree in electronics or computer science engineering

 Required secondary list of skills:

       -Version control and bug-tracking systems;

       -Unit testing experience;

       -Documentation compilation work;

       -Skills in the use of measuring instruments (oscilloscope, multimeter, etc.);

     -Hardware experience (verification work, circuitry understanding and ability to read and  

      understand electronic schemes).

        We are looking for an Accountant to join a global IT FinTech holding (PSP) that provides payment and fintech SaaS solutions focused on high-risk industries, with high transaction approval rates. The company provides access to a wide range of international payment methods, works with multiple jurisdictions, and supports merchants across global markets.

The  project - PSP systems

Jurisdictions – Europe and Canada

Finance department team – Treasury, Head of Reconciliation (Financial Manager), Accountant, part-time external accountant, CFO 

Work format – remote full time

Conditions – competitive salary, flexible schedule, paid vacation and sick leave, career and financial growth, official employment, and a professional team

Requirements

• 2+ years of experience as an Accountant in FinTech / PSP / high-risk / iGaming companies
• Experience working with different jurisdictions
• Mandatory experience with Poland accounting/reporting (core jurisdiction)
• Understanding of finance reporting standards (IFRS / GAAP)
• Experience with: month-end closing, financial reporting, payroll (multi-currency, contractors)
• Experience working with external accountants / outsourcing providers in different countries
• Strong Excel / manual data processing skills
• English –  B2+

Will be a plus:

• Experience with multiple European jurisdictions
• Professional certification (ACCA, CPA, or equivalent) 
• Knowledge of other languages

Responsibilities

Accounting & Reporting

• Support month-end closing and financial reporting.
• Consolidate financial data across companies and assist CFO/Head of Reconciliation with analysis.
• Ensure compliance with GAAP/IFRS standards.
• Manage tax reporting (VAT/GST and corporate taxes) and oversee statutory reporting, including controlling filing annual accounts with local registrars (e.g. Companies House).
• Maintain financial deadlines calendar and liaise with external accountants across jurisdictions.

Payroll & Payments

• Manage payroll for ~50+ employees / contractors (multi-currency)
• Prepare payroll data and perform plan vs actual analysis
• Handle reporting related to payroll and compensation
• Record intercompany loans, fees, and settlements

Vendor & Accounts Payable 

• Work with vendor invoices and documentation
• Validate invoices and financial data from systems
• Coordinate with Treasury 
• Maintain and control vendor-related financial data

Budgeting & Finance Support

• Support CFO in budget preparation (data collection & validation)
• Provide financial inputs for planning 
• Consolidate departmental budgets into company-wide financial model
• Prepare monthly budget vs actual analysis

Audit & Compliance

• Support audit processes (data preparation, communication with auditors)
• Review statutory accounts prepared by external accountants
• Coordinate annual audit process
• Prepare audit schedules and supporting documentation (PBC lists)
• Ensure accuracy and completeness of financial data

The company offers

• Competitive salary
• Opportunity to work in international FinTech
• Exposure to: multi-entity structures, cross-border finance, crypto payments
• Fast decision-making and dynamic environment
• Direct work with top management (CFO, CEO, Finance leadership)
• 24 working days of paid annual leave
• 10 public holidays
• 5 paid sick leave days per year
• Learning & development support

Workload — Full-time
Duration — 4 years
Location — Munich

We are looking for a Senior Java Developer to support the maintenance, further development, modernization, and 3rd-level support of a complex public-sector software landscape in Munich. The applications include an existing Java Fat Client application, a Java web application based on JSF/PrimeFaces, EAI components, and new modules to be developed using a modern reference architecture with Java backend and Vue 3 frontend. The work includes technical design, implementation, unit testing, documentation, defect correction, and knowledge transfer within an integrated DevOps team.

Key Responsibilities
Analyze technical specifications and clarify open questions independently with the customer/team.
Implement changes and extensions in Java-based individual software systems.
Support the gradual modernization and replacement of legacy Fat Client components.
Work on Java web applications, backend services, EAI components, and new reference architecture modules.
Create and maintain unit tests, mainly with JUnit.
Fix defects found during module, integration, user acceptance, and infrastructure testing.
Contribute to system design, technical documentation, architecture documentation, developer handbook, and operational documentation.
Support 3rd-level incident analysis, root cause investigation, workaround definition, and defect resolution.
Participate in code quality improvement, refactoring, and lifecycle management activities.
Work with the customer’s CI/CD and software production environment.
Transfer knowledge to customer-side developers and internal team members.

Required Skills
Minimum 5 years of professional Java development experience.
Strong experience with Java enterprise applications.
Good knowledge of Java 11 and/or Java 21.
Experience with JEE-related standards and frameworks.
Experience with Spring and Hibernate.
Experience with WildFly / JBoss application servers.
Strong unit testing experience with JUnit.
Experience with Oracle databases, SQL, performance analysis, and database-related troubleshooting.
Experience with Maven, Jenkins, Git, Artifactory, and Sonar.
Experience working with existing/legacy software systems developed by another vendor.
Ability to understand large codebases and improve them incrementally.
Good understanding of software quality, refactoring, coding standards, logging, authorization concepts, and maintainability.
Experience writing technical documentation for developers and operations teams.
German language skills for written and spoken customer communication.

Nice To Have
Experience with Java Fat Client applications.
Experience with OpenWebStart / Java WebStart distribution.
Experience with JSF2 and PrimeFaces.
Experience with Vue 3.
Experience with Apache Artemis.
Experience in public-sector projects.
Experience with structured knowledge transfer from previous vendors or legacy teams.
Experience with test automation, functional testing, system testing, or TestLink.
Experience with proprietary or model-driven Java frameworks; TREND/Framework experience would be a strong plus.
Working Model

The work is expected to be mainly on-site in Munich, especially during onboarding and integration into the customer DevOps team. Remote work may become possible later depending on the consultant’s knowledge level and integration into the project.

We invite a highly analytical and proactive HR Process and Automation Specialist to join our team at Dev.Pro. In this hands-on operational role, you’ll audit and improve HR processes by identifying bottlenecks and optimizing internal workflows. You’ll leverage AI and automation tools to reduce manual work and build more efficient, error-free processes.

🟩 What's in it for you:

• Drive HR process improvements across a global IT company with 1,000+ specialists 
• Grow your expertise in HR operations, workflow optimization, and automation 
• Apply AI tools to solve HR operational challenges in a real-world business environment

✅ Is that you?

• 3-5 years in HR Operations or a process-driven operational role
• 1+ year of experience implementing automation in HR processes
• Hands-on experience using AI tools for process automation, research, and content generation
• Experience auditing and redesigning HR processes (pre/onboarding, documentation, data tracking)
• Advanced Excel/Google Sheets proficiency (formulas, logic functions, data validation)
• Strong analytical and problem-solving skills to identify and improve process gaps
• Strong written communication skills for clear process documentation and reporting
• Ability to work independently and manage multiple priorities in a fast-paced environment
• High attention to detail and data accuracy
• Understanding of HR data privacy and compliance principles, including GDPR

Desirable:

• Experience working in the IT industry and familiarity with common IT roles and workflows

🧩Key responsibilities and your contribution 

In this role, you’ll support day-to-day HR operations while improving existing workflows, applying automation to reduce manual work, and maintaining accurate, well-structured HR data and reporting.

• Support day-to-day HR operations while continuously improving workflows to eliminate manual work
• Use AI and automation tools to transform manual HR checklists into automated workflows
• Apply critical thinking to identify operational and compliance risks within HR processes
• Proactively suggest and implement practical solutions to mitigate risks
• Use advanced spreadsheet formulas to clean, manipulate, and analyze HR data
• Create structured reports by translating complex HR data into clear insights

🎾 What's working at Dev.Pro like? 

At Dev.Pro, we appreciate your contribution and the value you add to projects. We are a company with an ambitious and creative mindset whose corporate culture is based on respect for diversity and uniqueness, as well as enablement of equal opportunities for all. By joining Dev.Pro, you'll feel what it's like to grow with professionals who support your journey.

✅Get 30 paid rest days per year to use as holidays/vacation/other on the desired and requested dates
✅5 sick leave days, up to 60 days of medical leave, and up to 6 days of leave per year due to family reasons (i.e., wedding/funeral/baby birth)
✅Get a health insurance package on reimbursement basis 
✅Join fun online activities and team-building events
✅Get continuous remote HR, payroll support, and overtime coverage 
✅Join English/Polish lessons 
✅Grow your expertise with mentorship support and DP University

  We  are looking for a Senior Business Development Manager to join an international innovative IT product company and iGaming platform provider, part of a global investment holding, dedicated to developing advanced deep-tech solutions for the iGaming industry, which is a part of the investment holding. 

The company develops and delivers a full-cycle Casino & Sportsbook solution (fiat & crypto), and provides operational, marketing, and licensing support.

The product – modular iGaming platform (18,000+ games)

Main markets – Global focus; Tier 1–3 markets (EU, LATAM, Africa, Asia).

Company size: 90+ employees 

Company departments: Sales, Legal, Operation and Marketing, Technical

Office/work mode: Offices in Armenia, Dubai, Cyprus; fully remote;

Conditions:  Competitive fixed salary + bonuses, compensation for main events in different countries, paid vacation, sick leave, and other benefits.

Requirements

• 3+ years of B2B sales experience in iGaming (platform/sportsbook/turnkey solutions)
• Proven sales experience in one or several markets: EU, LATAM, Africa, Asia (crypto-focused GEOs)
• Experience in designing and implementing a successful sales strategy
• Ability to analyze markets and competitors, identify trends and opportunities for growth
• Track record of successfully managing the sales cycle from planning to closure
• The existing network of operators or decision-makers is a strong advantage
• Ability to work independently in a fast-moving, high-growth environment
• Strong negotiation skills and resilience, combined with ownership mindset
• English – B2+

Responsibilities:

• Create and implement a comprehensive B2B sales strategy to achieve company sales goals and expand market share in the iGaming industry
• Delivering the complete B2B sales process: from prospecting to deal closure
• Analyze market trends and sales performance to identify opportunities for growth and improvement
• Building long-term relationships with clients and maintaining accounts after closing
• Expanding presence in priority regions 
• Maintain accurate CRM records and provide regular pipeline reporting
• Conduct commercial negotiations with C-level executives and decision-makers
• Collaboration with cross teams to deliver client needs
• Represent the company at major industry events (ICE, SBC, SiGMA, iGB, etc.)
• Representing the brand in online and offline business activities

We offer:

· A competitive bonus system with no income cap.

· The opportunity to work as part of an international team.

· The chance to influence the company’s commercial strategy.

· Participation in the world’s leading iGaming conferences.

· Opportunities for career growth alongside company’s development.

We are looking for a detail-oriented and proactive QA Engineer to join our FB Conversion Team. This role is ideal for someone with solid experience in manual testing who is ready to take ownership of product quality and ensure the best possible user experience across our brands.

You will work closely with Product Managers, Developers, Designers, and Marketing teams, testing customer journeys, promotional mechanics, communications, and new product features. Experience in iGaming will be a strong advantage.
 

Requirements:

- 2+ years of experience in Manual QA.

- Previous experience in iGaming, Betting, Casino, or Gambling products.
- Strong understanding of software testing methodologies, bug lifecycle, and QA best practices.
- Experience testing web and mobile applications.
- Ability to write clear bug reports and technical documentation.
- Experience working with Jira or similar task-tracking systems.
- Strong attention to detail and analytical thinking.
- Ability to work independently and take ownership of testing areas.
- Excellent communication skills and ability to collaborate with cross-functional teams.
- English level: Intermediate or higher.
 

Responsibilities:

- Conduct manual testing of our brands across web and mobile platforms.
- Perform daily product testing according to established checklists and quality standards.
- Identify, document, and report bugs with clear reproduction steps and technical descriptions.
- Verify new features, releases, and improvements before production deployment.
- Test user journeys, bonus mechanics, promotional campaigns, communications, and conversion funnels.
- Collaborate closely with Product Managers and Developers, providing detailed feedback and recommendations.
- Analyze competitors and market trends to identify potential product improvements and quality gaps.
- Review and analyze user sessions using Smartlook and other analytics tools to identify usability issues.
- Monitor and validate content updates across projects.
- Support sprint processes by ensuring timely testing and delivery of assigned tasks.
- Participate in continuous improvement of QA processes and testing documentation.
 

Would be a plus:
- Experience with Smartlook, Hotjar, or similar user behavior analytics tools.
- Understanding of conversion funnels and customer journeys.
- Experience testing CRM communications, bonus systems, and retention mechanics.
- Basic knowledge of competitor analysis and product benchmarking.
- Familiarity with Agile/Scrum methodologies.

Work conditions

- Flexible working hours and a remote work setup, so you can plan work around your life and not your life around work!
- Unlimited vacation days and paid sick leave—because your rest matters.
- A competitive compensation that truly reflects your skills and expertise.
- Employee referral bonus and gifts to celebrate your special occasions.
- 50% financial support for learning expenses to supercharge your professional growth!
- A positive atmosphere where you always feel respected and truly belong.
- Inspirational team-building activities that turn colleagues into best friends.
- Wellness benefits: We’ll support your sports passions, from yoga classes to gym memberships.
- Co-working space reimbursement to save your nerves from always working from home :)

We're excited to invite you to complete a test task. We'll send you the details via direct message.

Fortes.vision is a Ukrainian enterprise specializing in 3D visualization services for designers, architects, and real estate professionals worldwide.

We are on the lookout for a project manager to oversee our client relationships. This role is ideal for someone with basic project management experience who is eager to grow and embrace new knowledge.

Requirements:

- Proactive and responsible attitude.

- English proficiency at an upper-intermediate level or higher for client correspondence and meetings.

- Prior education in project management, including any relevant courses or achievements, is highly regarded.

- Enthusiasm for personal development and a receptivity to new ideas.

Additional qualifications that will be advantageous:

- Experience in organizational roles.

- A background in a technical field.

What we offer:

- The flexibility of remote work, allowing you to work from anywhere on your own schedule.

- A competitive and prompt salary, including a base rate and project management bonuses, designed to keep you motivated and appreciated.

- Diverse opportunities for professional growth, enhancing your skills and expanding your knowledge base.

❗️Please note that this role is office-based for Spain.

❗️If you need to be relocated, we take care of the process.

BrainRocket is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. ‍Young, ambitious, and unstoppable, we've already taken Cyprus, Malta, Portugal, Poland, and Serbia by storm. Our BRO team consists of 1,300 bright minds creating innovative ideas and products. We don’t follow formats. We shape them. We build what works, launch it fast, and make sure it hits.
 

❗️ Important: This is an On-Site Position in Spain❗️

This is an on-site position based at our office in Spain, Valencia. Remote or hybrid arrangements are not available once you join the team.

Are you ready for an international move? We are looking for candidates who are either already based in Lisbon or are eager to relocate to Portugal.
To make your transition smooth, we provide full relocation support and visa sponsorship for successful international candidates ❗️

⚡ We are looking for an experienced Senior Backend Developer (Node.js) to join our development teams in Valencia and lead the backend technologies of our systems. This is a highly hands-on role: you will be actively writing and reviewing code, shaping architecture, and driving technical excellence while mentoring your team.

✅ Requirements:

✔️Strong knowledge of JavaScript and the ECMAScript 6 standards;

✔️5+ years of commercial experience with Node.js and Nest.js;

✔️5+ years of commercial experience in web development;

✔️Commercial experience of working with high-load SQL or NoSQL databases;

✔️Commercial experience of implementing the REST, GraphQL, and WebSockets;

✔️Understanding of the TDD principles and experience of writing tests;

✔️Understanding of microservice architecture principles;

✔️Experience of GIT version control system;

✔️Experience with RabbitMQ;

✔️Experience with Redis;

✔️Experience with databases MongoDB, MySQL;

✔️At least an Intermediate level of English.
 

✅ Will be a plus:

✔️2+ years of hands-on experience developing over CI/CD/Micro Services architecture/Containers;

✔️Experience with Kubernetes;

✔️Experience with Nats;

✔️Experience with TypeScript.
 

✅ Duties and opportunities:

✔️In-house platform development;

✔️3rd party API integrations;

✔️Actively participate in developing new features from scratch.
 

✅ We offer excellent benefits, including but not limited to:

🧑🏻‍💻 Learning and development opportunities and interesting, challenging tasks;
📝 Official employment following Spain/EU laws, including registration of family members;
✈️ Relocation package (flight tickets + 2-week hotel stay);
📚 Language development support and partial compensation for classes;
🎁 Birthday celebration gift;
🏝 23 working days of Annual Vacation for proper rest;

🏋️‍♂️Social Club and more than 50 events per year - coming soon;

⚖️ Competitive remuneration level with annual review;

🏄🏻‍♂️ Teambuilding activities.
 

Bold moves start here. Make yours. Apply today! 

Domain: iGaming / Gambling
Format: Product company
Experience: 5+ years

About the Company

We are an international product company operating in the gambling sector. Our platform delivers real-time personalization for casino and sportsbook products using advanced machine learning. The solution processes live behavioral, transactional, and contextual data to improve player engagement, retention, and overall performance for operators worldwide.

Our focus is on building production-grade ML systems that directly influence what users see in real time — from game recommendations to personalized content and promotions.

Role Overview

We are looking for a Senior Data Scientist to join a product-focused team working on real-time personalization and recommendation systems for iGaming platforms.

This is a hands-on role that combines modeling, experimentation, and close collaboration with engineering and product teams in a high-load, real-time production environment.

Main Responsibilities

• Develop ML-driven features for casino products using supervised learning (regression, ranking, classification)
• Maintain and improve existing recommendation systems in production
• Enhance models using gradient boosting and other supervised approaches
• Perform data cleaning, preprocessing, and feature engineering
• Design and maintain pre- and post-processing workflows
• Optimize training and inference pipelines for performance and reliability
• Integrate ML models into Airflow pipelines in a multi-tenant environment
• Adapt and configure the solution for different clients (tenants)
• Collaborate closely with product and engineering teams on experimentation and feature delivery

As Part of the Team You Will

• Work cross-functionally with data scientists, engineers, product owners, designers, and researchers
• Analyze large-scale datasets to extract insights for product and business decisions
• Propose, implement, and evaluate ML approaches to solve real business problems
• Support and evolve a recommendation solution used across multiple tenants
• Influence product strategy through research, experimentation, and data-driven insights into user behavior

Experience & Education

• 5+ years of professional experience in data science
• Degree in a quantitative field (Mathematics, Statistics, Computer Science, or similar)

Core Skills

• Strong proficiency in Python and SQL
• Hands-on experience with data processing tools (Pandas, Polars)
• Solid engineering skills for building and maintaining scalable ML systems
• Experience implementing observability in ML pipelines (metrics, logging, alerting)
• Knowledge of Docker and Kubernetes
• Strong analytical mindset with the ability to solve loosely defined problems
• Hands-on experience with supervised ML techniques, including:
  • Regression and ranking models (XGBoost, LightGBM, CatBoost, neural networks)
  • Feature engineering and model evaluation (AUC, NDCG, MSE, uplift metrics)
  • Personalization or recommendation systems
• Proven experience deploying ML models to production (near real-time or batch)
• Solid understanding of statistical methods (A/B testing, significance testing)

Nice to Have

• Production experience with large-scale recommendation systems
• Experience with Airflow, Valkey/Redis, FastAPI in production
• Familiarity with contextual bandits or reinforcement learning
• Experience with AutoML tools

BrainRocket is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. ‍Young, ambitious, and unstoppable, we've already taken Cyprus, Malta, Portugal, Poland, and Serbia by storm. Our BRO team consists of 1,300 bright minds creating innovative ideas and products. We don’t follow formats. We shape them. We build what works, launch it fast, and make sure it hits.
 

❗️ Important: This is an On-Site Position in Spain❗️

This is an on-site position based at our office in Spain, Valencia. Remote or hybrid arrangements are not available once you join the team.

Are you ready for an international move? We are looking for candidates who are either already based in Lisbon or are eager to relocate to Portugal.
To make your transition smooth, we provide full relocation support and visa sponsorship for successful international candidates ❗️

⚡ We are looking for an experienced Team Lead Backend Developer (Node.js) to join our development teams in Valencia and lead the backend technologies of our systems. This is a highly hands-on role: you will be actively writing and reviewing code, shaping architecture, and driving technical excellence while mentoring your team.

✅ Responsibilities:

• Lead, mentor, and manage backend engineers through regular one-to-one sessions, feedback, performance evaluations, and individual development plans.
• Actively write, review, and refactor code and directly contribute to building and improving our systems.
• Participate in agile ceremonies (Scrum/Kanban) to ensure team alignment and adherence to agile best practices.
• Enhance system quality by resolving technical debt, optimizing architecture and flows, and performing data cleaning and restructuring.
• Design solutions and make key technical decisions for changes and enhancements.
• Assign tasks and balance workloads within the team to ensure efficient delivery.
• Collaborate with Engineering Managers to adopt the latest technologies and drive company-wide engineering initiatives.
• Document domain knowledge, improve engineering standards, and contribute to initiatives that enhance the broader engineering organization.

✅ Requirements:

• Bachelor’s, Master’s, or higher degree in Computer Engineering, Computer Science, Applied Mathematics, or a related field.
• 8+ years of professional backend development experience.
• 3+ years of experience in leadership positions.
• Strong experience with Node.js and modern web development.
• Knowledge of Kubernetes, containers, infrastructure, system design, SQL, and NoSQL databases.
• Experience with RESTful APIs, message brokers, 3rd party integrations, and secure development practices.
• Familiarity with CI/CD, microservices, cloud-based development, and test-driven development is a plus.
• Deep understanding of data structures, coding patterns, and algorithms.
• Experience with agile methodologies, ideally Scrum.
• Excellent problem-solving, diagnostic, and troubleshooting skills.
• Strong leadership, organizational, and mentoring abilities.
• Upper-intermediate or advanced English.
 

✅ We offer excellent benefits, including but not limited to:

🧑🏻‍💻 Learning and development opportunities and interesting challenging tasks;

✈️ Relocation package (tickets, staying in a hotel for 2 weeks);

🏋️‍♂️ Company fitness corner in the office for employees;

📚 Opportunity to develop language skills and partial compensation for the cost of language classes;

🎁 Birthday celebration present;

🏝 Time for proper rest and 24 working days of Annual Vacation;
 

Join BrainRocket and rock with us! 🚀

Bold moves start here. Make yours. Apply today!

Our client is an innovative cryptocurrency and fintech startup focused on building secure, scalable, and user-friendly digital asset products and services for the retail market. Driven by a mission to simplify access to the crypto ecosystem, the company provides reliable infrastructure, seamless transactions, and exceptional user experiences. As an agile, forward-thinking organization, they are positioned to capture significant market share by bridging the gap between traditional finance and decentralized digital assets.
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Position Summary
​We are seeking a veteran, exceptionally skilled Hands-on Technical Lead to act as the ultimate Key Person and architect of our engineering ecosystem. This is a high-impact, elite technical role tailored for an absolute master of the JavaScript/TypeScript landscape who thrives when building complex platforms from the ground up.

​Initially, you will lead from the front lines by getting your hands dirty in the codebase—architecting and writing the core high-performance engine for our proprietary cryptocurrency exchange.

As you establish the initial code baseline, you will act as the foundational pillar to build and scale a brilliant team around you. For the right individual, this role offers an immediate and structured pathway to transition into the Chief Technology Officer (CTO) position as the company grows.

​This role is designed for a technical heavyweight who loves coding, architecture, and team design. You will write the core engine, set the standards, and transition into executive leadership as the engineering organization scales.

Key Responsibilities

• ​Hands-on Development & Architecture: Architect and implement robust, highly optimized backend systems using JavaScript/TypeScript (Node.js) for exchange infrastructure, order books, and transactional systems.
• ​Team Building & Growth: Serve as the central hiring pillar. Screen, recruit, and assemble an elite group of engineers to build a team around your technical vision.
• ​Technical Leadership & Standards: Set pristine code standards, architecture principles, and secure coding practices across the entire codebase. Mentor and coach incoming engineers.
• Product-to-Tech Alignment: Partner closely with business stakeholders to rapidly translate high-level product strategies into performant, clean technical implementations.
• ​Security & Resilience: Personally oversee the secure design of hot/cold wallet mechanics, API routing, matching systems, and regulatory reporting capabilities within the JavaScript stack.

​Required Qualifications & Experience

• ​Minimum 15 years of professional experience in software development and technical leadership.
• ​Mandatory Fintech/Trading/Crypto Exchange Background: Extensive experience building, maintaining, or optimizing trading platforms, complex transactional systems, or cryptocurrency exchange frameworks.
• ​JavaScript/TypeScript Mastery: World-class expert level in the JavaScript ecosystem. Deep, thorough understanding of asynchronous programming, Node.js memory management, event loop optimization, and building highly scalable, low-latency microservices.
• ​Foundational Team Builder: Demonstrated track record of acting as a "Key Person" whom previous engineering teams look to for direction and around whom technical talent naturally gathers.
• ​Executive Trajectory: Possess the strategic vision, communication skills, and high emotional intelligence required to swiftly step into a Chief Technology Officer (CTO) role.
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What We Offer

• ​A direct, fast-track trajectory to the Chief Technology Officer (CTO) title based on performance.
• Compensation plan that matches your status as a vital "Key Person."
• ​Technical autonomy to shape the architecture and team culture from the absolute beginning.
• Medical Insurance in Ukraine and Multisport program in Poland.
  Offices in Ukraine (Kyiv, Kharkiv) and Poland (Wroclaw) or Remote.
• Paid vacation, sick leaves, and official holidays.
• Legal & Accounting services.
• The company provides all necessary equipment.
• English classes and Education reimbursement.
   

About the role

We're building a performance marketing team, and this role is central to how we grow — owning conversion rates across all marketing touchpoints and the full user journey from first page view to first paid session. You'll work at the intersection of marketing, product, and engineering to generate, test, and scale ideas that move our core metrics: conversion rate, new clients, and CAC.

Responsibilities

• Own conversion performance across all marketing surfaces: main website, blog, landing pages, campaign funnels, and any new acquisition flows.
• Generate, prioritize, and execute CRO hypotheses — from ideation through briefing, prototyping, A/B testing, analysis, and implementation of winning variants.
• Design new funnels for paid channels (Meta, TikTok, and others as we scale), including concept, user flow, messaging framework, and success criteria. Coordinate execution with design, content, and engineering teams.
• Own the post-click experience for all paid traffic — ensure that what happens after a user clicks an ad is optimized for conversion, not just for traffic volume.
• Create and optimize landing pages for campaigns, audiences, and channels — working with designers and developers or using no-code/AI tools where appropriate.
• Monitor and analyze funnel performance at every stage (page view → authorization → first therapy created → first purchase). Identify drop-off points, diagnose root causes, and act on them.
• Run a continuous experimentation process: maintain a hypothesis backlog, manage test calendars, ensure statistical rigor, document results and learnings.
• Write clear briefs and technical specs for product and engineering teams. Communicate the goal, the hypothesis, the expected impact, and the success criteria for every initiative.
• Collaborate with the product team on the authorization-to-purchase flow. Currently owned by product — this role progressively takes over the marketing lens on this funnel, working jointly to improve it.
• Collaborate with the UA/paid channels manager on campaign-to-conversion alignment: ensuring ad creative messaging matches landing page experience, and that conversion signals are properly tracked.
• Participate in tracking and attribution setup alongside analytics — flag data gaps, validate conversion events, ensure the team can trust the numbers.
• Report regularly on conversion metrics, experiment results, and impact on new clients and CAC.

Requirements

• 3+ years in growth marketing, CRO, or a similar experimentation-driven role in a product company (marketplace, SaaS, subscription, or similar).
• Proven track record of improving conversion rates through systematic testing — not just ideas, but shipped experiments with measurable results.
• Strong understanding of user funnels, landing page best practices, and conversion psychology.
• Ability to write clear briefs, create wireframes or prototypes (even rough ones), and articulate what needs to be built and why.
• Hands-on experience with A/B testing tools (Google Optimize, VWO, Optimizely, or built-in product experimentation).
• Comfortable with analytics tools (GA4, Mixpanel, or similar) — able to pull data, interpret funnel reports, and make decisions based on evidence.
• Understanding of event-based tracking: how user events and parameters work, how they trigger flows, and what breaks when tracking is misconfigured.
• Strong cross-functional communication skills — this role lives between marketing, product and engineering daily.
• Structured thinking and ability to prioritize based on expected impact vs. effort.

Nice to have

• Experience with mental health, wellness, or other sensitive/high-trust products where aggressive conversion tactics don't work.
• Experience creating funnels for Meta Ads or other paid social channels specifically.
• Familiarity with no-code tools for landing pages
• Understanding of paid acquisition economics (CAC, LTV, ROAS) and how CRO improvements cascade into unit economics.
  
  What we offer:
• An opportunity to work on a health tech product that improves people’s mental well-being worldwide;
• Flexible schedule and full remote work- no strict location requirements;
• A team of passionate professionals who love what they do and foster an open, supportive atmosphere where every idea is heard and creativity is encouraged;
• Fully remote work with an option to visit our cozy office in Kyiv;
• Competitive compensation, based on your qualifications and experience;
• Paid time off 33 days per year (including public holidays);
• Paid sick leave  10 working days per year;
• Budget for learning and development;
• Paid mental health leave (5 working days per year)