Jobs at Djinni

🌎Akvelon is an American company with offices in Seattle, Mexico, Ukraine, Poland, and Serbia. Our company is an official vendor of Microsoft and Google. Our clients also include Amazon, Evernote, Intel, HP, Reddit, Pinterest, AT&T, T-Mobile, Starbucks, and LinkedIn. To work with Akvelon means to be connected with the best and brightest engineering teams from around the globe and working with an actual technology stack building Enterprise, CRM, LOB, Cloud, AI and Machine Learning, Cross-Platform, Mobile, and other types of applications customized to client’s needs and processes.

We’re looking for a Software Development Engineer with simulation software experience.
 

You will build high-performance simulation systems, modeling complex processes over time and delivering accurate data for real-time visualization and analysis.

Requirements:

• 5+ years of professional experience in Python-based software development.
• Experience working with Machine Learning and AI technologies.
• Experience in designing and developing services and APIs.
• Proven experience with Object-Oriented Programming (OOP) and design patterns.
• Familiarity with cloud platforms (e.g., AWS, Azure, GCP) and containerization technologies (e.g., Docker, Kubernetes).
• Experience in designing or working with simulation software, especially discrete-event simulation or dynamic modeling systems.
• Hands-on experience with relational databases, specifically PostgreSQL, including schema design, query optimization, and performance tuning.
• Familiarity with service-oriented architecture (SOA) or microservices.
• Excellent problem-solving skills and attention to detail.

Preferred Qualifications:

• Familiarity with specific discrete-event simulation frameworks such as SimPy (Python).
• Prior experience in the logistics, port terminal, or supply chain domain is highly desirable.

• Knowledge of mathematical modeling, operations research, or optimization techniques.

   

Overlap time requirements: till 10 AM PST

Working conditions and benefits:

• Paid vacation, sick leave (without sickness list)
• Official state holidays — 11 days considered public holidays
• Professional growth while attending challenging projects and the possibility to switch your role, master new technologies and skills with company support
• Flexible working schedule: 8 hours per day, 40 hours per week
• Personal Career Development Plan (CDP)
• Employee support program (Discount, Care, Health, Legal compensation)
• Paid external training, conferences, and professional certification that meet the company’s business goals
• Internal workshops & seminars
• Corporate library (Paper/E-books) and internal English classes.

Domain: Banking & Finance
Experience: 5+ years
Start – End: February 16, 2026 – April 30, 2026(If the collaboration is successful, there is a strong possibility to extend the contract through the end of 2026)
Format: Full-time, remote
Location: Poland (with occasional business trips to Berlin, fully covered)

About the Project

We are looking for Senior Golang Developers to join the development of an MVP for a client in the banking and finance domain.
The initial engagement is planned from February to April. If the collaboration is successful, there is a strong possibility to extend the contract through the end of 2026.

The role is remote from Poland, with occasional on-site visits to the client in Berlin. All travel expenses are covered.

Responsibilities

• Design, develop, and maintain backend services using Golang
• Own key system components from idea to production
• Collaborate closely with product managers, architects, and engineering teams
• Participate in architectural decisions and technical discussions
• Ensure performance, reliability, and scalability of backend solutions
• Write clean, well-tested, and maintainable code
• Review code and mentor less experienced developers
• Debug, troubleshoot, and optimize existing systems

Requirements

• 5+ years of professional software development experience
• Strong hands-on experience with Golang in commercial projects
• Solid understanding of REST APIs and backend architectures
• Experience with microservices and distributed systems
• Experience working with SQL and/or NoSQL databases
• Familiarity with Docker and containerized environments
• Experience with cloud platforms (AWS, GCP, or Azure)
• Understanding of CI/CD pipelines
• Strong problem-solving skills and attention to detail
• Good communication skills and experience working in international teams
• Experience working in agile environments (Scrum, Kanban)
• Fluent English

Nice to Have

• Experience with Kubernetes
• Knowledge of event-driven architectures (Kafka, RabbitMQ, etc.)
• Experience building MVPs or working on greenfield projects

Tech Stack

• Golang
• Microservices
• REST APIs
• Cloud platforms

For our partner BigD isseeking a talented Senior Data Analyst! 

About The Company: 

BigD is an iGaming operator (top brand). But that’s not all — we also have a thriving Affiliate Program, a handy Payment solution, and an AI user acquisition solution. Company is a big family of over 500+ creative minds.

What to do:

• Collect, process, and analyze large data sets in the gambling/betting domain
• Design and build a product analytics system from the ground up
• Form and maintain a reporting system for key business metrics (conversion, deposit, LTV, etc.)
• Analyze user behavior, conduct user segmentation, and identify key trends
• Plan and execute A/B tests and experiments, evaluate their efficiency
• Identify growth points and develop recommendations for boosting conversions and revenue

• Build and monitor dashboards and deliver regular analytical reports

   

We Company looking for:

• 2+ years of experience as a Data Analyst
• Deep understanding of core gambling/betting metrics and business processes: conversion, deposit, LTV, ROI, churn, retention, 
• Confident in SQL and working with databases
• Familiarity with analytics platforms
• Knowledge of BI tools - Tableau, Power BI, Metabase, etc. 

• Experience with BI tools (must) 

   

Working conditions:

• Direct communication with the core TEAM
• 28 calendar days of vacation
• Paid sick leave
• Sports compensation
• Compensation for courses and training
• Day off for birthday
• Flexible work schedule
• Regular salary reviews
• Salary paid at a favorable rate
• Non-toxic work environment, free of bureaucracy

• Stable salary payment

   

Join a fast-growing team at the forefront of the iGaming industry, where your expertise will directly contribute to the company's growth and success.

 If you believe your CV is a good fit for this position, please send it to us!

NICE Systems, is looking for a Senior QAA Engineer. It`s our long-term partner from Israeli hi-tech domain, architect and deliver top-notch software solutions that empowers organizations to capture, analyze and apply insights from both structured and unstructured Big Data. If you are looking for technology challenges, prefer to follow Agile routines and ready to explore new professional horizons, this opportunity is for you.

Join NICE Systems, the worldwide leading provider of software solutions in real time insights and analytics from both structured and unstructured Big Data.

RESPONSIBILITIES

• Design and maintain reliable automation frameworks and tools that support functional, regression, and end‑to‑end testing.
• Build high‑quality automated test suites and ensure they align with business requirements and engineering standards.
• Drive and contribute to QA improvement activities, including automation strategy, test coverage expansion, defect‑reduction initiatives, and enhancements to overall product quality.
• Develop automated tests to support consistent quality across all components.
• Troubleshoot automation issues, improve existing scripts and pipelines, and support ongoing maintenance.

• Collaborate with developers, QA, product, and DevOps teams to ensure automation supports overall system architecture and workflows.

   

SKILLS

• 5+ years experience working with a variety of different automated testing techniques, test-driven development strategies.
• Strong hands-on experience in test automation for enterprise grade software applications using Playwright, Selenium and TestNG.
• Strong programming skills in Java and JavaScript.
• Experience with AI‑assisted development tools (GitHub Copilot, ChatGPT, Claude, or similar) and the ability to integrate generative AI into the automation lifecycle for script generation, debugging, and optimization.
• Hands-on experience with API Integration testing using Postman / RestAssured.
• Hand-on experience with the design and execution of test plans and test cases for complex server applications.
• Experience with testing public cloud infrastructures and technologies, preferably AWS.
• BS/MS degree in Computer Science, Engineering or a related subject.
• Upper-intermediate level of English.

WE OFFER

• Work in a creative friendly environment using cutting-edge technologies.
• Work-life balance and flexible schedule.
• Competitive compensation with focus on your expectations; annual salary review.
• 24-day paid vacation and 100% paid sick leave.
• Professional, language and soft skills trainings.
• Health insurance coverage: individual and family, Fitness plan.

Our client is a company that is one of the prominent providers of unique online slot games based in Spain. With a team of more than 30 developers, designers, and marketers, they are dedicated to creating innovative and captivating slot games. 

Overview: We’re looking for a Project / Product Manager to join a small ML team focused on building a RAG agent and internal AI tools for slot game development—covering discovery and product direction through delivery, pilots, and adoption.

Required skills:

• 3–5+ years as a Project Manager / Product Manager / Tech PM.
• Experience with either ML/AI products (chat assistants, RAG, recommenders, automation) or deeply technical internal developer products (DevTools/platforms/automation).
• Experience with engineering/ML teams: translating user needs into tasks, understanding production feasibility.
• Product thinking: problem/hypothesis, validation (interviews/surveys/experiments), metrics (usage, time saved, reduced routine, user satisfaction).
• Strong Jira/Confluence + understanding of dev processes (agile/kanban, code review, releases, tech debt).

• Technical fluency: specs/diagrams, sometimes JSON/YAML; high-level understanding of RAG.

   

Responsibilities:

• Own and maintain the product direction for the RAG agent and internal AI tools.
• Run discovery with client developers, support, and technical writers; prioritize use cases.
• Define MVPs/pilots and plan iterations with ML and infrastructure constraints in mind.
• Own the ML team backlog: prioritize by value/complexity, plan sprints; align with game development, support, and technical writing teams.
• Translate user requests into clear technical tasks and ensure deliverables become actually used functionality.
• Organize pilots, collect feedback and metrics, and decide - based on data.
• Drive adoption by integrating tools into workflows (Jira, Confluence, IDE, internal services) and supporting documentation/onboarding together with technical writers and developers.
• Manage ML engineers.

Сompanу offer:

• Competitive salary.
• A friendly and creative atmosphere.
• Opportunities for professional growth and development.
• Flexible working hours and remote work options.

We are growing as a team and are looking for a designer who wants to grow with us and have a direct impact on the visual direction of our projects.

We work on conceptual, visually strong websites and digital products with a clear focus on idea, aesthetics, and detail.

We aim for a level of work that is featured in curated selections and awards, including projects of this caliber:

https://craftwork.design/curated/websites/

Responsibilities:

Designing interfaces for websites and digital products

Creating wireframes, prototypes, and final UI

Working on conceptual promo and brand websites

Building clean, flexible UI kits tailored to specific projects

Joining ongoing projects and elevating their visual quality

Close collaboration with developers at all stages of the project

Preparing and presenting work for Dribbble and Behance

Working with typography, grids, rhythm, and composition

Requirements:

1–3 years of experience as a UX/UI Designer

Strong proficiency in Figma

Solid understanding of UX principles and user flows

Strong sense of modern UI and visual design

Graphic design skills and experience working with visual assets

(typography, composition, graphic elements)

High attention to detail

Ability to work independently and at a fast pace

Nice to have:

English proficiency

After Effects (micro-animations, motion)

Webflow

Photoshop

Projects you will work on:

SaaS websites and product interfaces

Conceptual promo and brand websites

Websites for influencers and creative agencies

What we offer:

Full-time position

Salary: $1000

Remote work

Small, focused team with no bureaucracy

Projects that are worth showcasing in your portfolio

English B1-B2, Full-time 
ABOUT THE PROJECT:

We're building a vehicle-based ecosystem that adds location services to your car - parking, EV charging, fuel, car wash, toll management, all automated based on where you drive.

Stage: Backend & web frontend built (.NET/Blazer), launching Q1 2025.

WHAT YOU'LL BUILD (January MVP):
Core features for App Store & Google Play launch:

Registration & Onboarding
Personal details collection
Credit card integration (payment setup)
User profile management

Driver's Log / Trip Management
List of trips (fetched from backend)
Categorize: Private vs Business trips
Trip history & details
Foundation for future location services

Tech Stack:
Mobile: Flutter (required) - clean restart preferred
Backend: .NET REST APIs (already built, just integrate)
Current: Some .NET MAUI code exists (can reference OR restart fresh)
Note: We're open to Flutter rebuild for better ecosystem

Future (post-January):
EV charging integration (first service)
Parking services
Fuel payments

REQUIREMENTS

Senior Flutter Developer
Real production experience 
Clean, maintainable code from day 1 
Self-sufficient 
Fast learner

Technical Must-Haves:
Flutter (iOS + Android)
REST API integration (.NET endpoints)
Authentication/security flows
Payment integration experience
App Store & Google Play submission knowledge

Availability:
Start: ASAP
Commitment: Full-time until January launch (then discuss ongoing) 
Initial 1–3 month engagement, with extension possible.

We’ve been operating in the crypto industry for over 10 years, building long-term teams and sustainable processes. Now we’re looking for a CFO who can take full ownership of the financial and legal function in a crypto business — from daily liquidity control to building structures that can withstand audits, regulators, and rapid growth.

This role is hands-on and strategic at the same time. You’ll work closely with the CEO, shareholders, Compliance, Product, and Operations, and will be responsible for the financial stability and transparency of the entire group.

What you’ll be doing

• Take ownership of the financial and legal function across the group of crypto companies.
• Ensure stable liquidity and asset safety (fiat and crypto).
• Oversee treasury management, cash flows and reserves, preventing cash gaps and account blockages.
• Maintain full financial visibility and control at group level.
• Prepare and oversee management reporting for leadership and shareholders.
• Control and optimize cost structure.
• Manage the group legal structure (opening and closing entities, financial reporting).
• Work closely with Compliance, Legal, Product and Operations on financial topics.
• Support licensing and regulatory processes from the financial side.
• Manage and develop the finance & legal team (5–10 people).
  
  What we expect from you 
• 2+ years of experience as CFO / Head of Finance / Deputy CFO in the financial industry.
• Experience in fintech, crypto projects, exchanges or PSPs.
• Strong understanding of how a crypto exchange operates
• Ability to analyze and reconcile on-chain transactions with internal reports and accounting.
• Practical experience dealing with incidents: stuck transactions, balance discrepancies, delayed withdrawals, cross-chain issues.
• Solid background in treasury management (fiat & crypto): liquidity, reserves, risk of blockages.
• Experience working with complex multi-entity legal structures, including offshore jurisdictions.
• Understanding of tax and legal structuring principles.
• Proven people management experience (5–10 team members).
• Experience building or improving finance processes: treasury, controlling, management reporting.

Soft skills that really matter here:

• Hands-on mindset.
• Team player and people leader.
• Ability to hold people accountable for results.
• Strategic thinking and ownership mindset.
• Genuine interest in crypto and how the industry works in practice.

Nice to have

• Big Four background.
• ACCA / CFA certification.

Hiring process 

• Interview with HR
• Test task
• Interview with the CEO
• Interview with shareholders
• Reference check 

Perks of being a part of EXMO 🙌

Crypto teaches flexibility — so we focus on real, practical benefits instead of clichés.

• Competitive salary.
• Flexibility to work fully remote or from a comfortable coworking — your choice.
• Reimbursement for English lessons and sports activities.
• 100% sick leave coverage.
• 30 business days of unified leave per year + 2 public holidays for all team members.
  A friendly team that is genuinely happy to welcome a new teammate 😉

About the role 

We’re looking for a Project Manager to lead planning and execution of product initiatives in a fast-paced, startup environment. You’ll manage cross-functional coordination, ensure timely delivery, and break down business goals into epics and stories with clear business and technical requirements.

 

Key Responsibilities

• Manage and oversee end-to-end product development cycles from concept to launch
• Facilitate sprint planning, daily stand-ups, retrospectives, and backlog grooming sessions
• Coordinate with cross-functional teams including product, design, engineering, QA, and stakeholders
• Maintain project documentation, timelines, and roadmaps in tools like Jira and Confluence
• Ensure alignment between business goals, technical requirements, and delivery expectations
• Identify risks and blockers, propose mitigation plans, and keep teams unblocked
• Report on project status, timelines, and deliverables to leadership and key stakeholders
   

Requirements

• 5+ years of experience in project management, preferably in a productized tech company (SaaS, e-commerce, marketplace, or similar)
• English - solid B2 at minimum. 
• Understanding of Agile/Scrum methodologies and best practices
• Proficiency with modern project management tools (Jira, Trello, Notion, or similar)
• Strong technical literacy – ability to understand web applications, software architecture, APIs, and the software development lifecycle
• Excellent communication and organizational skills
• Comfortable working with both technical and non-technical stakeholders
• Ability to manage multiple projects simultaneously in a dynamic, fast-paced environment

Nice to Have

• Background in software engineering (at least minimal) and/or in business analysis 
• Experience working in cross-timezone or distributed teams
• Familiarity with DevOps pipelines, Git, or system architecture diagrams
• Exposure to user-focused development cycles (A/B testing, feature flagging, etc.)

What We Offer

• A product-focused environment with real ownership and impact
• Fully remote position
• Opportunity to work on meaningful products with a growing startup team
• Salary in USD

We are looking for a motivated and ambitious Strong Junior Python Developer who is eager to grow in the field of modern web technologies. You will become part of our team, contribute to interesting and challenging projects, and gain valuable experience under the guidance of senior colleagues.
 

What you’ll be doing:

• Developing new features and modules for our products.
• Participating in the design and maintenance of REST APIs.
• Writing clean, efficient, and testable code.
• Integrating with various external services and databases.
• Participating in code reviews and collaborating with the team.
• Troubleshooting, debugging, and optimizing existing code.

Requirements:

• 6+ months of commercial experience in Python development.
• Knowledge of either Django or FastAPI.
• Hands-on experience with PostgreSQL or MongoDB.
• Solid understanding of REST API design principles.
• Basic knowledge of cloud technologies (AWS or others) is a plus.
• English proficiency at an Upper-Intermediate (B2+) level.

We offer:

• Competitive salary.
• Opportunities for professional and career growth.
• Mentorship and support from experienced developers.
• Work on interesting projects with a modern technology stack.
• Flexible schedule and remote work options.
• Official employment and paid vacation/sick leave.
• Corporate events and a friendly team atmosphere.

Drones kill and injure over 5,000 Ukrainians every month. Munin exists to stop that. We are building hand-launched micro-missiles to intercept small drones at short range. Small enough to carry three in a vest and cheap enough for wide use, this will be the smallest, most cost-effective guided missile ever deployed.

We work from a test site in Oslo, UK and in Kyiv, directly with Ukrainian brigades. Our goal is to turn the tide of war and give NATO a proven soldier-level counter-drone solution.

We are hiring a Computer Vision Engineer to join our founding team.

You will lead the design and development of the missile’s electronics system, from ideas to field tests and production. You will own the architecture, guide component selection, and drive integration while staying hands-on through bring-up, testing, and iteration.

Responsibilities

• Design system architecture and lead electronics development

• Select and integrate sensors, processors, power systems, and actuators

• Design PCBs

• Develop test plans for live environments and build test rigs

• Collaborate with mechanical and software engineers to ensure reliable, testable systems

Requirements

• Experience with embedded or mechatronic system design

• Strong PCB design and debugging skills

• Skilled in sensor integration and power management

• Able to balance high-level design with hands-on execution

• Willing to work from Oslo, UK or Kyiv

Bonus

• Aerospace or computer vision experience
• Knowledge of control systems or autonomy
• FPGA programming experience
   

Why Munin

• Impact: Build tech that saves lives

• Ownership: Lead seeker development for a new missile category

• Team: Join a mission-driven group from Stanford, Imperial, Rheinmetall, and special forces

• Benefits: Salary, 0–3% equity, housing, travel, and training support

This is not a research role. We are flying real hardware fast. If you are ready to build something that matters, apply.

DataArt is a global software engineering firm and a trusted technology partner for market leaders and visionaries. Our world-class team designs and engineers data-driven, cloud-native solutions to deliver immediate and enduring business value.

We promote a culture of radical respect, prioritizing your personal well-being as much as your expertise. We stand firmly against prejudice and inequality, valuing each of our employees equally.

We respect the autonomy of others before all else, offering remote, onsite, and hybrid work options. Our Learning and development centers, R&D labs, and mentorship programs encourage professional growth.

Our long-term approach to collaboration with clients and colleagues alike focuses on building partnerships that extend beyond one-off projects. We provide the ability to switch between projects and technology stacks, creating opportunities for exploration through our learning and networking systems to advance your career.

We are seeking a highly skilled and experienced System Administrator to join our team.

Responsibilities

• Work in a team of professionals, responsible for supporting and maintaining complex distributed worldwide infrastructure based on a variety of Microsoft solutions
• Manage installations, upgrades, and configurations of hardware and software
• Provide L2 and L3 technical support
• Ensure uptime and performance monitoring of core services and systems
• Troubleshoot issues and outages
• Keeping technical documentation up to date
• Follow the company's security and compliance policies and procedures
• Follow the change management process
• Follow Business Continuity and Disaster Recovery Planning (BCP\DRP)

Requirements

• 3+ years of experience in maintaining an environment of 100+ computers
• Good knowledge of Active Directory's structure and group policies
• Good knowledge of PowerShell and experience creating automation scripts
• Good knowledge of Windows 10/11
• Good knowledge of Windows Server 2019, 2022, 2025
• Confident knowledge of the principles of network technologies (DNS, DHCP, NAT, VPN, Proxy servers, TCP/IP, STP, VLAN)
• Excellent understanding of computer hardware
• Ability to quickly learn new or unfamiliar technology and products using documentation and internet resources
• Good communication skills: ability to communicate effectively with internal customers
• Can take the initiative, good teamwork skills, the ability and desire to work in multitasking mode
• Have strong experience in at least one of the following technologies:
• Microsoft Exchange mail (2019\SE\Hybrid\Exchange Online)
• Microsoft Endpoint Configuration Manager (MECM) \ System Center Configuration Manager (SCCM)
• Intune\M365\Microsoft Defender XDR\Microsoft Entra identity and access
• Good spoken English (Upper-intermediate)

Nice to have

• Experience with Azure Active Directory, Office365, Intune, AzureADconnect, PKI, Veeam backup, Zabbix, Elastic Stack
• Certifications: M365, Azure, CCNA and other vendor certifications

Work model: Remote-first (EU time zones) with hubs in Portugal, Poland, Ukraine
Reporting to: Founders
Compensation: Competitive base + uncapped commission + KPI-linked equity vesting
 

About US:

Founded in 2019, we build augmented nearshore engineering teams and delivers end-to-end solution ownership for EU and US clients.
We combine senior engineering talent in Poland, Portugal, and Ukraine with transparent delivery, strong product engineering practices, and a pragmatic, founder-led culture.

We’re entering a significant growth phase and are looking for an ambitious Business Development Lead to help scale our commercial engine.
 

The Opportunity

This is a hands-on, high-impact role working directly with the founders.
You’ll own full-cycle sales, shape go-to-market strategy, and—once repeatability is proven—build and lead sales, marketing, and pre-sales functions.

This is not a presentation-only role. It’s about closing deals, building momentum, and creating a scalable revenue system—with meaningful upside.
 

What You’ll Do

• Own pipeline and revenue for nearshore teams and solution delivery services across EU and US markets
• Drive the full sales cycle: prospecting, qualification, discovery, solution shaping, proposal, negotiation, and close
• Build partner and channel motions where relevant (ISVs, consultancies, cloud partners)
• Collaborate closely with delivery leaders to create credible estimates, roadmaps, and SOWs
• Set up and refine CRM, forecasting, and reporting to support data-driven decisions
• Define positioning, pricing, and sales collateral together with marketing; ensure strong message–market fit
• Establish reference customers and case studies; systematize win/loss feedback loops
• Hire, mentor, and lead a small BD / marketing / pre-sales team as growth milestones are reached
   

What Success Looks Like

First 90 days

• Clear ICP definition and messaging
• Active outbound sequences live
• ≥3× pipeline coverage on first-quarter target
• Predictable forecasting cadence in place

After 6 months

• Repeatable proposal and SOW templates
• At least two new clients closed
• Partner pipeline launched

After 12 months

• Sustainable 3–4× pipeline coverage
• Healthy win rate and predictable revenue
• First commercial hires onboarded
• Revenue growth tracking to plan
   

What You Bring

• 3–6 years of experience selling software outsourcing, nearshore, or custom product engineering services
• Proven track record of quota attainment and closing complex, multi-stakeholder service deals
• Strong network among EU and/or US buyers (Product, Engineering, CTO, Procurement)
• Deep consultative selling skills: uncovering business pain, shaping solutions, and negotiating commercial terms
• Experience working closely with delivery and engineering teams on pricing and deal structures (T&M, dedicated teams, fixed scope)
• Fluent English (additional European languages are a plus)
   

Nice to Have

• Experience in adtech, data & analytics, fintech, SaaS, MarTech, or cloud modernization
• Background in building early GTM playbooks (ICP, sequences, collateral, KPIs)
• Familiarity with HubSpot or Salesforce, proposal automation, and RFP/RFI processes

We are looking for a motivated QA Engineer to join our dynamic team, focusing on web and AI-driven projects. This role is ideal for someone early in their career who is passionate about ensuring software development and has an interest in growing into a more advanced BA role in the future.

You will collaborate with developers, product managers, to test innovative web and AI applications, identify defects, and ensure an exceptional user experience.

Responsibilities

• Perform manual testing of web and AI applications to identify bugs, defects, and usability issues.
• Create, execute, and maintain test cases and test scenarios based on project requirements.
• Document and report defects with clear steps to reproduce, using bug-tracking tools (e.g., Jira).
• Collaborate with the development team to verify fixes and ensure issues are resolved.
• Participate in requirement analysis and provide feedback to improve product quality.
• Assist in regression, functional, and exploratory testing activities, including testing AI model outputs and web interfaces.

• Contribute to the continuous improvement of QA processes and methodologies, with an eye toward future automation opportunities.

   

Requirements

• +3 year of experience in software testing or a related field (internships or personal projects are a plus).
• Basic understanding of software testing principles, methodologies, and the software development lifecycle (SDLC).
• Familiarity with bug-tracking tools (e.g., Jira, Trello) and test management tools (e.g., TestRail).
• Interest in web and AI technologies, with exposure to testing web applications (e.g., REST APIs, browser-based interfaces) and AI-driven features (e.g., chatbots, recommendation systems).
• Knowledge of relevant tech stack: JavaScript, Python (for testing AI components), Postman (for API testing), and browser developer tools (e.g., Chrome DevTools).
• Strong attention to detail and problem-solving skills, with a proactive mindset for learning and growth in the QA field.
• Good communication skills to collaborate effectively with cross-functional teams working on web and AI solutions.
• Upper-intermediate English proficiency (written and verbal).
• (Optional) Basic knowledge of automation tools (e.g., Selenium, Cypress) or scripting languages (e.g., Python, JavaScript) is a plus.
• A strong desire to develop and advance in the QA direction, with potential interest in automation, performance testing, or AI-specific testing in the future.

Are you ready to take ownership of mission-critical backend systems in a high-load, transaction-heavy environment? 

We are looking for a Senior Java Developer to join our Payments Domain team in Warsaw.

This is a hybrid role with 3 days per week in the office, giving you the perfect balance between collaboration and flexibility. 

At Sigma Software, we value engineering excellence, multicultural teamwork, and delivering secure, high-performance solutions.

Why join us? You’ll work on a platform processing millions of transactions daily, contribute to architectural decisions, and be part of a company where innovation and ownership are encouraged.
 

Customer

Our customer is a well-established international company in the iGaming industry, known for its engineering-driven culture and multicultural team distributed across multiple countries. Operating multiple brands across various markets, the company delivers secure, high-performance digital platforms recognized for reliability and scalability.
 

Project

You will be part of the Payments Domain team, responsible for developing and maintaining a large-scale payments platform built on modern microservices architecture. The platform processes millions of secure transactions daily, supporting multiple brands and geographies. The work focuses on scalability, reliability, and performance in a high-load environment, covering everything from integration with payment providers to transaction monitoring and compliance.

Requirements:

• 5+ years of commercial experience with Java and Spring Boot
• Strong experience with MySQL and Kafka
• Proven track record working with microservices architecture in high-traffic, high-load systems
• Experience developing high-performance backend solutions for transaction-heavy platforms
• Ownership mindset with the ability to deliver services end-to-end
• Excellent communication skills in English (C1 level), both written and verbal
• Experience with Kotlin
   

Responsibilities:

• Design, develop, and maintain backend services for the payments platform using Java and Spring Boot
• Ensure high availability, scalability, and performance of transaction processing systems
• Collaborate with cross-functional teams to define technical requirements and deliver solutions end-to-end
• Implement integrations with payment service providers and internal systems
• Participate in architectural discussions and contribute to system evolution in a microservices environment
• Monitor, troubleshoot, and optimize services in production
• Ensure compliance with security, regulatory, and operational standards
• Drive continuous improvement in code quality, testing, and deployment practices