Jobs at Djinni

We are looking for a Staff Software Engineer to take technical ownership of a new component of an enterprise network security platform operating across complex IT, OT and IoT environments.

You will join at the beginning of a new product component and engineering team, designing the architecture and building the solution from the ground up.

This is a hands-on technical leadership role, not people management. You’ll work closely with Product, QA and other engineering teams while remaining deeply involved in architecture and coding.

What You’ll Do

• Design and build a new platform component from scratch.
• Own architecture and key technical decisions through production implementation.
• Develop core backend and infrastructure components primarily in Go.
• Work with the platform’s data plane, distributed systems and data flows.
• Build scalable, reliable services using Kubernetes and cloud-native infrastructure.
• Work with PostgreSQL, APIs and service-to-service communication.
• Provide technical direction as the new engineering team grows.
• Use modern development approaches, including AI-assisted coding tools such as Claude Code.

What We’re Looking For

• Experience as a Staff / Principal / Lead Engineer, Software Architect, or equivalent senior hands-on role.
• Excellent Go / Golang skills — core requirement.
• Strong software architecture and system design experience.
• Proven experience designing and building complex distributed systems.
• Strong backend and infrastructure engineering background.
• Hands-on experience with Kubernetes and cloud-native environments.
• Experience with PostgreSQL and production data architecture.
• Good understanding of data plane architecture, networking, APIs, concurrency, performance, scalability and reliability.
• Ability to turn ambiguous requirements into architecture and working production systems.
• High degree of technical ownership and independence.
• Comfortable working in a fast-moving startup environment with a strong delivery focus.

Nice to Have

• Python and/or Java development experience.
• Experience with networking, cybersecurity or infrastructure platforms.
• Experience with microsegmentation, policy enforcement or similar network security systems.
• Experience with Claude Code or other AI coding agents.
• Public technical leadership, such as conference speaking or engineering community contributions.

Other details:

Location & Working Model

• CET timezone.
• Kraków is preferred, with weekly office collaboration.
• Strong candidates elsewhere within the required time zone can be considered.
• B2B contract with a US entity.
• 120-140k annual rate
• Output-oriented working model.
• Company laptop provided.

Interview Process

1. 30-minute discussion with engineering leadership.
2. Technical deep dive with live coding and architecture discussion.
3. Final technical/culture discussion if needed.

COMPANY  

Zoot empowers financial service providers worldwide with secure, scalable decisioning technology  that streamlines operations, reduces risk, and elevates the customer experience. 

Our configurable platform and industry solutions enables banks, fintechs, and payment providers to launch intelligent lending, onboarding, and credit evaluation solutions with speed and precision. With over 35 years of experience, a robust global infrastructure, and a growing global presence, Zoot is trusted by leading financial brands to deliver real-time decisions, seamless integrations, and long-term success. 

About the Role

We're looking for a hands-on SEO and GEO specialist to own our organic growth engine. You'll own the website and organic channel performance — SEO, content distribution, and how we show up in traditional and AI-driven search — working directly in our tools and CMS, not through an agency.

This is a high-ownership, individual-contributor role focused on depth, not breadth. You won't manage a team or coordinate agencies — you'll bring SEO/GEO expertise the rest of the team doesn't have, and execute the work directly yourself. If you thrive doing hands-on technical SEO and want to own outcomes, this is your seat.

"You'll be the person who makes our marketing measurable, scalable, and impossible to ignore."

Key Responsibilities

SEO, Website & GEO/AEO (Primary Focus)

• Own the website — built on WordPress / Divi — as a lead channel, responsible for traffic, conversion rate, and lead quality end to end, working directly in the CMS.
• Drive conversion optimisation (CRO): run structured A/B and multivariate tests on key landing pages, CTAs, forms, and user journeys to continuously lift conversion rates.
• Lead SEO strategy and execution: in-depth keyword research, on-page optimisation, technical SEO audits, internal linking, and content gap analysis — with a strong bias for continuous iteration, not one-off projects. This work is done directly by you — not supervised through an agency.
• Ensure the site is optimised for Generative Engine Optimisation (GEO) — structuring content, schema markup, and site architecture so that AI-powered search engines (ChatGPT, Perplexity, Google AI Overviews, Bing Copilot) surface and cite us accurately.
• Maintain and improve AI crawlability and grounding: manage robots.txt, structured data, llms.txt, and other signals that govern how AI crawlers index and represent our brand in generated answers.
• Act as primary point of contact for our external web agency — briefing, steering, and QA-ing development and design projects to ensure deliverables are on time, on brief, and aligned with our marketing and SEO goals. This covers development/design builds only — SEO strategy and execution remain yours, not the agency's.
• Implement and maintain tracking (GA4, GTM, pixels) for clean, reliable data flows across all touchpoints.
• Translate SEO and GEO insights into clear, actionable content briefs for the content team — define target keywords, instruct content creation, and close content gaps.

Content Distribution (Executional)

• Publish and distribute content across the website, LinkedIn (organic + ads), email, and other channels, in coordination with the content team.
• Ensure consistency and quality across all channels.

HubSpot — Marketing & Content Hub

• Work comfortably within our existing HubSpot Marketing & Content Hub setup — workflows, forms, and lists are already configured; you don't need to build or administer the system, just use it effectively for content distribution and lead handoff.

Reporting — MQLs & SALs

• Monitor SEO and content performance using GA4, GTM, and Looker Studio (or similar).
• Interpret performance data, draw conclusions, and surface clear recommendations for improvement.

Profile

• 6+ years in a hands-on SEO, Technical SEO, or Organic Growth role — direct execution experience, not agency-managed.
• Working familiarity with HubSpot marketing automation tools — expected baseline, not a differentiator.
• Proficiency with SEO tools (Semrush, Ahrefs, Screaming Frog, or equivalent) and hands-on technical SEO experience. (Must-Have)
• Hands-on WordPress & Divi experience — comfortable managing pages, templates, and plugins. (Must-Have)
• Solid grasp of web analytics: GA4, Google Tag Manager, Looker Studio or similar.
• Strong, hands-on understanding of GEO principles — structured data, entity optimisation, llms.txt, and AI-first content strategy.
• Strong analytical mindset — you think in funnels, cohorts, and conversion rates.
• Clear communicator who translates data into compelling stories for non-technical stakeholders, particularly when briefing content creators on SEO-driven priorities.
• Highly autonomous, detail-oriented, and comfortable owning multiple workstreams simultaneously.
• Experience guiding or briefing content creators using SEO/keyword data — e.g., defining target keywords, identifying content gaps, and instructing content production.

Zoot Offers

• Competitive salary and a high-quality working environment.
• Know-how, professionalism, and an international market-leading reputation.
• Interesting and challenging international clients and projects.
• Highly motivated, highly qualified team of friendly colleagues.
• Flexible working schedule.
• Financial support for relevant certifications and professional events.

Interested? Let’s connect and discuss the details!

Senior Back-end (Python) developer

We are looking for a Senior Python Engineer in start-up
 

Who are we?
Software Engineering company with expertise in FinTech and Blockchain. Strong software engineering culture. Fast development pace. We do things long-term. We build trust and relationships with employees and customers.
 

Who are we looking for? 

A Python developer who has

• Experience 5+ years with Banking products in product companies (not outsoursing)
• Experience in Python on a microservice architecture 7+ years
• Experience with SQLAlchemy or Django - 7+ years
• Experience with GraphQL - 6 months+
• Experience with FastAPI / aiohttp 
• Experience with PostgreSQL

Soft skills:

• English - B2-C1
• Ability to decompose tasks
• Ability to be a part of team

What is important to us? 

• Teamwork and mutual assistance 
• Good communication skills 
• Responsibility for the team’s results 
• Ability to meet deadlines 

About us:

• Full remote
• Fast-pace inviroment
• Ready to have meetings at 6.00 or 23.00 (European time)

Part-time position (20 hours per week)

Sprinterra is a technology powerhouse specializing in crafting custom software and IT solutions to propel businesses forward. Our commitment to delivering results-oriented solutions is unwavering, as we constantly strive to empower businesses to thrive in an increasingly digital landscape.

About the Position

Part-time position (20 hours per week)

We are launching a new brand for our custom software and AI application development services. 

The strategy is defined. We need someone to execute it week by week: publishing content, growing the channels, keeping the cadence steady. You will report to the Head of Marketing and work closely with business development, across SEO, LinkedIn, email and event support.

Key Responsibilities

• Write and publish website content: service pages, case studies, blog articles, working from engineering input and client material.
• Own the content plan and keep a steady monthly cadence.
• Handle on-page SEO: keyword research, page structure, meta data, internal linking, Search Console monitoring.
• Build the new brand's LinkedIn presence from zero: company page, ghostwritten posts for key accounts 
• Launch and run a monthly newsletter, including list building and consent management.
• Produce sales and event materials: landing pages, one-pagers, case study PDFs, post-event content.
• Build the first backlink profile through directory listings, partner links and outreach
• Report on traffic, rankings, LinkedIn growth and lead quality, with recommendations attached.

Requirements

• 4+ years of hands-on B2B marketing experience, ideally in software outsourcing industry 
• Strong English writing: you can turn a technical conversation with an engineer into something a business reader will relate to. 
• Practical SEO experience: keyword research, on-page optimization, content briefs, Search Console.
• Experience running B2B LinkedIn, including writing in someone else's voice.
• Working knowledge of GA4, Google Tag Manager and HubSpot or a similar CRM.
• Experience with outbound campaigns 
• Able to work independently and hold a publishing cadence without being chased.
• Experience automating marketing workflows: connecting tools, setting up triggers and sequences, and using AI to speed up repetitive production work
• Fluent English, written and verbal.

Nice to Have

• Experience launching a brand or website from zero.
• Familiarity with manufacturing, ERP or industrial B2B audiences.
• Google Ads experience on niche, low-volume search terms.
• Basic Figma or Canva skills.

JustMarkets is a global fintech company delivering high-tech trading and investment solutions to millions of clients across 160+ countries since 2012.

We are hiring an CRM & Lifecycle Automation Specialist to building and continuously optimizing full-cycle automated communication funnels (Email, App/Web Push, In-App) to drive LTV growth and reduce churn rate.

You will have direct ownership of the automation and communications architecture and an opportunity to drive Retention & LTV, test hypotheses with full autonomy and zero micromanagement.

Responsibilities

• Map and refine the end-to-end client lifecycle journey based on trading behavior, deposit history, risk tolerance, and platform engagement; create dynamic user segmentations based on real-time event tracking
• Design, build, and deploy automated trigger workflows and drip campaigns using modern CRM/Lifecycle tools; Reviewing and evaluating content from a Retention Marketing perspective within the scope of assigned campaigns
• Cross-functional collaboration with Data/BI/Engineering, Product, and Marketing teams to design compelling promotional offers, ensure accurate behavioral event tracking in the CRM, and implement advanced personalization logic using dynamic tags
• Set up structured A/B and multivariate tests for copy, send times, channel preferences, and incentives; track and report on lifecycle KPIs
• Ensure deliverability hygiene (IP warming, domain health, unsubscribe management) and partner with Legal and Compliance to align communications with regulations (GDPR, CAN-SPAM, local frameworks)
• Hands-on work with HTML/CSS templates, adapting responsive designs across diverse devices, and setting up dynamic content for specific audience segments.
• Regular monitoring of retention metrics, analyzing retention trends, and researching bottlenecks in user burnout and fatigue.
• Competitive analysis to track competitor messaging strategies and identify best practices within our niche.
• Preparing and launching regular and special promotional campaigns in compliance with brand guidelines, layout standards, and legal compliance - acting as a backup specialist

Requirements

• At least 3+ years of hands-on experience with B2C focus in designing and building event-driven automated workflows using modern CRM/ESP tools
• Proven experience executing multi-channel messaging strategies across Email, mobile/web Push, In-App messaging
• Deep understanding of how behavioral event data moves (JSON payloads, Webhooks, REST APIs, custom user attributes)
• Solid grasp of domain authentication protocols (SPF, DKIM, DMARC), IP warming strategies, spam filter mechanics, and inbox placement monitoring tools
• Proficiency in HTML/CSS for responsive email layout debugging and experience using dynamic scripting languages to personalize content based on user data
• Strong build retention cohorts, and analyze funnel performance using analytics platforms
• Proven experience in conceptualizing funnel logic and executing lifecycle campaigns across multiple stages (e.g. Onboarding, Retention, Churn Prevention, Reactivation); conceptualize funnel logic; event mapping experience
• Ability to formulate structured hypotheses and conduct rigorous A/B tests
• Advanced segmentation expertise
• Meticulous attention to detail, empathy for the trader journey, data curiosity and experimentation mindset, cross-functional collaboration skills, proactive troubleshooting, and a balance of speed and systemic quality
• Upper Intermediate English level 

Will be a plus

• Experience executing synchronized messaging strategies across SMS, and Messengers (WhatsApp/Telegram)
• Fintech/Financial product domain experience
• Understanding of how AI tools and automation can be leveraged to streamline routine in retention

We offer

• Direct ownership of the automation and communications architecture
• Opportunity to directly drive Retention & LTV and test hypotheses with full autonomy and zero micromanagement
• Tax expenses coverage for private entrepreneurs in Ukraine
• Expert support and guidance for Ukrainian private entrepreneurs
• 20 paid vacation days per year
• 10 paid sick leave days per year
• Public holidays as per the company's approved Public holiday list
• Medical insurance
• Opportunity to work remotely
• Professional education budget
• Language learning budget
• Wellness budget (gym membership, sports gear, and related expenses)

We're building a prediction-markets and order-book trading platform where prices move in real time and real money changes hands on every trade. We're looking for a QA Engineer to own the quality of that product end-to-end, from order entry and live market feeds to wallet flows, deposits, and settlement. You'll be the person the team trusts to say whether a release is ready, and the one who finds the bug before a user's balance does. If you like breaking things where correctness and money matter at the same time, this is that kind of product.
 

The work is mostly manual testing, scripts and automated smoke suites. You'll spend time near the most interesting parts of the system: order handling, real-time feeds, wallet flows, and the trading experience itself.
 

Technical Stack

- Product: React + TypeScript front end, Node.js + NestJS back end
- Real-Time: WebSockets / SSE, live market and order-book feeds
- Database: PostgreSQL, Redis
- Messaging: Kafka
- Web3: EVM chains, wallets (MetaMask, WalletConnect), testnets, block explorers
- Testing: browser devtools, Postman / curl, Playwright
- Scripting: TypeScript or Python
- Observability: Grafana, logs, and metrics
- Version Control: Git
 

What You'll Do

- Own quality end-to-end: join product discussions early, decide what needs testing, and sign off on releases.
- Test the money paths first: order placement, partial fills, positions, market resolution, payouts, deposits, and withdrawals.
- Test wallet and on-chain flows: connecting, approvals, gas, pending / stuck / replaced transactions, and chain switching.
- Verify below the UI: check balances and settlements against the database, inspect API and WebSocket traffic, and trace issues through logs.
- Script what you repeat: seed markets and test data, call APIs directly, and fire concurrent or duplicate requests to find races.
- Keep a small automated smoke suite healthy so every deploy gets a fast first check.
- File bugs a developer can act on immediately: clear steps, expected vs actual, request IDs or tx hashes, and logs.
 

What We're Looking For

- 2+ years of QA experience
- Strong exploratory testing with a risk-first mindset: you go after what can lose money before what looks wrong.
- Hands-on crypto experience as a user: wallets (MetaMask, WalletConnect), testnets, gas, approvals, and block explorers. You can tell a stuck transaction from a failed one.
- Trading basics: limit / market orders, partial fills, maker / taker, and how a prediction market resolves and pays out. You can work out the expected result before checking the UI.
- Comfortable with API testing (Postman / curl), browser devtools including WebSocket traffic, and SQL for checking data.
- Can write scripts in TypeScript to automate test data, API calls, and concurrency checks.
- Proficient with AI-assisted work: you use AI tools (Claude Code, Cursor, ChatGPT, and similar) daily to design test cases, write scripts, and triage logs, and you catch it when they're wrong. This is part of how we work day to day.
- Sound judgment, you know what blocks a release and what can ship with a ticket, and you raise questions only after doing your own homework.
 

Nice to Have

- Playwright or Cypress beyond the basics.
- Hands-on use of Polymarket, Kalshi, a CEX, or a perps DEX.
- QA on trading, fintech, iGaming / sportsbook, or other real-money / real-time systems.
- Load or concurrency testing
- Reading smart-contract test output
 

How We Work

- Small, flat team with a short path from idea to production.
- You own quality, not just test execution, and have a genuine say in how we ship.
- Open feedback, shared code, low ego.
- Developers own their unit tests; you own the bigger picture of what's covered and what's at risk.
 

What We Offer

- Fully remote work (Europe / Ukraine time zone).
- Competitive salary.
- Flat company structure: no bureaucracy.
- Opportunities for professional growth.
- Work-life balance with flexible working hours.
- Access to various learning resources and development programs.
- 20 days of vacation time.
- 5 illness days.

We are looking for a Junior-Middle Backend Developer to join a fast-growing start-up developing a product for automated lead generation and recruitment outreach.

Responsibilities:

• Day-to-day product implementation.
• Develop integrations with AI (e.g., Perplexity, OpenAI) & 3rd party API (e.g., CRMs).
• Leverage your prompt engineering skills to maximize the outcome.
• Customer discovery. That includes: internal product conversations, as well as joining some customer calls (Maybe not from day one, but definitely later on).

Requirements:

• At least 1 year of experience working in a product company/startup.
• 1-3 years of software development experience.
• Experience with Node.js, TypeScript, JSON, REST API, Git.
• Experience in LLM/RAG, MCP, and AI agent development and prompt engineering.
• Database design and optimization (SQL).
• Development in cloud infrastructure (AWS/GCP/Azure).
• Patterns for asynchronous task processing (RabbitMQ, SQS, or similar).
• Experience with n8n/make will be a great plus.
• Excellent verbal communication skills.
• Excellent English, minimum B2 level.
• Absolutely customer-centric and flexible in a dynamic environment (i.e., fully tolerant of shifting priorities daily).

Job details:

• Full-time.
• Fully remote.
• Long-term.
• B2B contract.
• Start date — ideally ASAP, but negotiable.

What else will you get:

• Learning how a startup grows.
• Direct impact on product and company strategy.
• Deliver value directly to paying B2B clients.
• You will work with the most modern toolset (including Cursor in Agent mode).

The hiring process:

• 30-45 min pre-screen interview with a recruitment manager.
• 30 min call with the client.
• A technical deep-dive interview, most likely with online coding (conducted by the client).

Remote 
Working Hours: Aligned with CST calling hours (flexibility required, occasional shifts up to 9:00 PM CET)

About the Role

We’re looking for a proactive and driven Sales Development Representative (SDR) to join our team. This role focuses heavily on outbound prospecting, especially cold calling, to generate qualified opportunities for the sales team. You’ll be the first point of contact for potential customers and play a key role in building our pipeline.

Key Responsibilities

• Conduct outbound prospecting through cold calls to generate new business opportunities
• Engage and qualify leads through meaningful conversations
• Identify customer needs and position relevant solutions
• Maintain accurate records of interactions in CRM systems
• Collaborate with the sales team to ensure smooth handoff of qualified leads
• Meet and exceed daily/weekly activity and pipeline targets

Requirements

• Proven experience in cold calling and outbound sales
• Strong conversational English skills (clear, confident, and engaging communication)
• Experience working with or targeting the US market
• Ability to handle objections and navigate conversations effectively
• Self-motivated with a results-driven mindset
• Comfortable working flexible hours aligned with EST time zones

Nice to Have

• Experience with LinkedIn outreach and social selling
• Experience running email outreach campaigns
• Familiarity with CRM tools and sales engagement platforms

Working Hours

• Primary focus on US (CST) calling hours
• Workday is not entirely call-heavy, but flexibility is required
• Occasional schedule adjustments up to 9:00 PM CET

What We Offer

• Competitive compensation (base + performance incentives)
• Opportunity to grow within a fast-paced sales environment
• Supportive and collaborative team culture

About product
Our product is an AI marketing service for solo founders and small teams. Our customers are English-speaking founders from all over the world. They reach us through the website chat (Crisp) and the support inbox. An AI agent handles the first line. A human steps in where a decision, hands-on help or an account check is needed.
We are looking for a Support Manager to own this second line end to end: from understanding the request to the customer reply and the ticket for engineers.
 

What you will do

• Handle customer conversations in Crisp and the support inbox in English. Reply fast, short and to the point, in one consistent company voice.
• Find the real cause instead of repeating what the customer said. Before replying, check the account in our internal tools.
• Bugs and feature requests: reproduce the issue, separate a bug from a product misunderstanding, describe the symptom and environment briefly, open a ClickUp ticket and tag the team in Slack. Get back to the customer once it is fixed.
• Manual account operations.

Tools we work in: Claude, Crisp, Stripe, ClickUp, Slack, Clerk, internal admin panel, Gmail.
 

What we expect

• 1+ year in customer support for a SaaS or another online product.
• Written English at B2 level.
• A habit of checking first and replying second.
• Resilience under pressure.
• Attention to detail.
• Ability to work independently.
• Understanding of how social networks work (Reddit, X, Facebook, Instagram, Threads) at the level of an active user: connecting accounts, limits, bans, the difference between a page and a group.

Nice to have

• Experience with Crisp, Intercom, Zendesk or a similar helpdesk.
• Experience setting up and working with an AI support chatbot.
• Confident use of Claude.
• Background in marketing or SMM.
• Basic understanding of how a web product works: what logs are, how to record a bug video, how to explain a problem to a developer.

What we offer 

• Health Insurance.
• GYM.
• English classes.
• 22 days off and 12 sick days.
• Paid national holidays.
• Teambuilding twice per year.
• Welcome box.

NuxGame is a B2B iGaming technology provider. We deliver turnkey casino and sportsbook platforms, game aggregation, and sweepstakes products to operators worldwide, across four product lines: Turnkey Traditional, Sweepstakes Turnkey, Game Aggregation, and Sweepstakes Game Aggregation.

Our customers are operators. Their back office teams work in our platform every day, and their players use it every time they deposit, verify their identity, or withdraw.

We are looking for a Product Manager to join our Finance Team. You will own everything on the platform that touches money, player identity, and player protection—spanning seven product domains with one dedicated engineering team behind you.

What You Will Do

• Payments and PSP
  • Own the payment roadmap across all four product lines and decide what gets built, what gets configured, and what gets refused.
  • Own the internal payment gateway as a product: integration contract, provider onboarding, error handling and retries, logs, and the tooling support uses to investigate a stuck transaction.
  • Own the technical and product side of PSP relationships and work with our PSP Manager, who owns commercial terms and provider selection.
  • Drive deposit and withdrawal conversion: cashier UX, method visibility and ordering, error minimisation, hosted versus platform side flows, retry and cascading logic.
  • Own crypto and Web3 coverage: networks, confirmations, on ramp providers, wallet based authorisation and deposits.
  • Shorten the time it takes to launch a new provider by standardising the integration, so a new PSP becomes configuration rather than custom development.
• Fraud, KYC and Compliance
  • Own the fraud and risk engine: rules and thresholds, risk scoring, verification flows, duplicate account and bonus abuse detection, manual review load.
  • Own third party KYC and AML integrations end to end, from provider evaluation and platform requirements through rollout to operators.
  • Turn licensing and jurisdictional requirements into configurable platform capability instead of per operator custom work.
  • Hold the balance between fraud prevention and conversion, and defend where you put the threshold.
• Auth and Identity
  • Own registration and login as a conversion product, including social and Web3 registration.
  • Own the relationship between authentication and verification: what a player can do before KYC, what unlocks after it, and how that differs by jurisdiction and by operator.
  • Own back office authentication, permissions, and audit logs as an operator facing product.
• Segmentation
  • Own segmentation as a shared service: how segments are defined, evaluated, and consumed across payments, limits, verification, and reporting.
  • Make it usable by operators without engineering involvement: rule builder, preview and validation before a segment goes live, predictable behaviour when several segments match one player.
  • Own the cost side of it: evaluation performance on large player bases and what happens when a segment changes mid-session.
• Reporting, Limits and Responsible Gambling
  • Own operator facing financial reporting, dashboards, and export tooling.
  • Own the limit framework (deposit, loss, wager, session) and geo blocking as jurisdiction aware, operator configurable capability.
  • Own the responsible gambling toolset and make sure it satisfies the licences our operators hold.

What We Expect From You

• You own the roadmap for your domains and you defend it. Prioritisation is your call to make and to explain, not something you escalate by default.
• You write specifications that an engineer can build from without a business analyst in between: scope and non scope, flows, edge cases, dependencies, acceptance criteria.
• You work with data yourself. You define the metric, pull the number, and check it before you act on it.
• You go deep on the technical side. You read API documentation, review integration contracts, and hold your own in a discussion with engineers.
• You design for many operators at once. Every decision is a decision about configuration, defaults, and backward compatibility, not about a single customer.
• You close the loop after release. A feature that shipped and moved nothing is not a delivered feature.

Requirements

Must Have

• 5+ years in product management, with at least 3 years owning payments, fraud and risk, or financial products in iGaming, fintech, or payments.
• Hands on experience with PSP and payment aggregator integrations: REST APIs, request and response construction, webhooks and callbacks, idempotency, status and error mapping, reconciliation.
• Practical understanding of the trade offs between hosted payment pages, iframe, and fully platform hosted cashier flows, including where PCI scope, conversion, and support load land in each.
• Experience with several payment method families: cards, e-wallets, bank transfer and local rails, vouchers, and crypto (networks, confirmations, on ramp providers).
• Experience integrating KYC and AML providers, and owning or building a rule based fraud or risk engine.
• Experience with rule based configuration and player segmentation: defining segments, resolving conflicts between overlapping rules, and giving business users a safe way to change them without a release.
• Working knowledge of the regulatory requirements affecting deposits, withdrawals, KYC, and responsible gambling in at least two or three jurisdictions.
• Data fluency: deposit success rate, approval rate by provider and method, withdrawal processing time, chargeback rate, verification funnel conversion. You can pull these yourself.
• B2B product experience. Our users are operators and their back office staff, not only end players.
• Structured written communication in English. Russian or Ukrainian for internal team communication.

Nice to Have

• Experience in a multi tenant white label platform serving dozens of operators at once.
• Sweepstakes or social casino experience, where purchase and redemption flows differ from classic deposit and withdrawal.
• Experience with payment orchestration platforms, smart routing, and cascading.
• Experience with Metabase or a comparable BI stack, and enough SQL to validate a number.
• Practical use of AI tooling in the product workflow for discovery, documentation, and analysis.

What We Offer

• Full ownership of a product area that directly moves revenue for dozens of operators, with a dedicated engineering team behind it.
• A direct line to the CPO and to top management. Decisions here take days, not quarters.
• Remote work with a distributed team, or an office in Limassol if you prefer one.
• Competitive salary, flexible hours, and paid time off.

A potential invitation to potential minds!

4K-Soft is People. People are most important to us. People are at the heart of every connection we build. Come and join 4K-Soft, where human minds come together to pave the way for the future. We offer a variety of full-time jobs, training programs and internships. Only imagine, how you can help our company and start your career with 4K-Soft!

We are looking for a Middle FullStack Web Developer.

What we expect from you:
English level: B2 or higher
Experience: 3+ years working with Node.js and React

We offer:

Competitive level of remuneration

Convenient work schedule, paid vacation and sick leaves

The opportunity to grow professionally by participating in the implementation of interesting and complex projects, as well as showing personal initiative.

The role is based in the Kyiv region, and we will expect you to work full-time in the office. We have a shuttle service from the nearest metro station.

About the Job

As Linux Software Engineer, you will be a key part of our System Architecture team to develop and maintain the Linux-based systems powering our unmanned aerial vehicles at Quantum-Systems. Together with our World-Class-Team, currently 3 team members, you will take an empowering role: pushing the boundaries of drone technologies.

You will be working closely with stakeholders from the Avionics, Systems Engineering, and Flight Testing departments to integrate hardware, third-party software, and onboard applications into a high-performance Linux platform.

Providing a reliable, scalable, and mission-critical software environment is essential to Quantum-Systems – your mission will have a powerful impact.

What is your Day to Day Mission:

• Maintaining existing as well as creating new Linux applications on the unmanned aircraft
• Designing and coordinating interfaces between teams, documenting the architecture and design decisions
• Integration of hardware and 3rd-party software into the Linux system, aligning with suppliers and other teams
• Testing of existing and new applications. This includes writing unit tests, integration tests, functional tests, and acceptance tests
• Analyzing logs from flights, both from test flights as well as real-world customer issues
• Debugging and finding solutions for software and hardware issues related to the Linux system
• Maintaining and extending the build system, pipeline, and tooling. Creating releases with release notes
• Working in an agile environment and following the defined development process

What you bring to the team:
 

• 3+ years of experience in Linux software development, preferably in embedded or robotics systems
• Strong proficiency in C/C++ (14 or newer) with proven experience developing Linux applications
• Understanding of Linux internals, including system services, device trees, and kernel modules
• Experience with cross-compilation, Yocto, Buildroot, or similar build systems
• Hands-on experience with debugging tools (e.g., GDB, strace, perf) and log analysis
• Familiarity with testing methodologies, including writing and executing unit, integration, and system-level tests
• Experience with CI/CD pipelines, version control systems (e.g., Git), and release management
• Strong problem-solving skills, with the ability to debug both software and hardware integration issues
• Proficiency in technical documentation, including interface definitions and architectural decisions
• Excellent communication and teamwork skills to work effectively across multiple engineering disciplines
• English Intermediate+

Nice to Have:

• Familiarity with middleware and interface standards such as DDS, MAVLink, CAN, or Ethernet
• Knowledge of containerization technologies (e.g., Docker) and virtualization
• Prior experience working in an Agile/Scrum development environment
• Exposure to real-time Linux or safety-critical software development is a plus

Why Quantum-Systems:

• We Stand with Ukraine
• We believe in the power of combined efforts: straightforward tech expertise paired with a customer-centric focus.
• We are industry pioneers who are ambitious, bold, and visionary.
• We push limits, think outside the box, and strive for technological excellence to shape the future of aerial data.

• We promise to be your runway for individual and professional growth.

   

About us:

Quantum Systems specialises in the development, design, and production of small Unmanned Aerial Systems (sUAS). The company’s range of electric vertical take-off and landing (eVTOL) sUAS are built to maximize range and versatility and to provide operators with a seamless user experience. By integrating cutting-edge software capabilities, like edge computing and real-time AI-powered data processing, Quantum Systems is building next-generation UAS for clients in defence, security, public sectors.

The role is based in the Kyiv region, and we will expect you to work full-time in the office. We have a shuttle service from the nearest metro station.

About the Job

As a Flight Control Systems Engineer, you will be a key part of our Flight Controls team to solve some of the most interesting flight guidance, dynamics, and controls problems you’ll have ever heard of. Together with our world-class team, currently four team members, you will take an empowering role: pushing the boundaries of drone technologies.

You will be working closely with stakeholders from the navigation, embedded systems, and flight test departments to conceive, implement, and validate flight guidance and control system algorithms, features, and improvements. Flight Controls at Quantum-Systems - your mission will be a powerful impact.
 

What is your Day to Day Mission:

• Design and programming of flight guidance and flight control algorithms for automatic and autonomous flight
• Support in model building for flight dynamic processes and design of control and feedback control laws based on these models
• Preparation and execution of flight tests with UAS systems
• Analysis of flight data recordings as well as evaluation and processing of test results
• Generation of C/C++ code with Matlab Simulink and its integration into the FCS / autopilot framework
• Supporting the certification of our product family and obtaining flight permits, e.g. for BVLOS flight projects
• Collaboration in the further development of the product development process

What you bring to the team:

• You have completed a degree/apprenticeship in the field of aerospace engineering, mechanical engineering, automotive engineering, electrical engineering or robotics.
• You have theoretical knowledge in the field of flight mechanics and have mastered the basics of control engineering. You also have practical experience with model aircraft, multicopters and / or their subsystems.
• You have knowledge of programming with Matlab/Simulink. Fluent handling of the programming language C and Git is also desirable.
• You are privately interested in model aircraft construction, drones or robotics and can't wait to implement and try out new ideas.
• Due to your open, communicative, friendly and competent attitude, it is easy for you to be considered as an internal expert.
• You are highly self-motivated and drive your area of responsibility independently.
• Communication in English is a matter of course for you.
   

Why Quantum-Systems:

• We Stand with Ukraine!
• We believe in the power of combined efforts: straightforward tech expertise paired with a customer-centric focus.
• We are industry pioneers who are ambitious, bold, and visionary.
• We push limits, think outside the box, and strive for technological excellence to shape the future of aerial data.
• We promise to be your runway for individual and professional growth.

The role is based in the Kyiv region, and we will expect you to work full-time in the office. We have a shuttle service from the nearest metro station.

About the Job

We are seeking a skilled Core Developer (Rust/ C++) for Swarm Robotics & Sensor Control with over 5 years of professional experience to join our dynamic development team. You will play a key role in building and optimizing the core architectures for the real-time control and management of robotic swarms and sensor systems. This position offers the opportunity to work with cutting-edge technologies and contribute to complex, mission-critical systems in a collaborative environment.

What is your Day to Day Mission:

• Design, develop, and maintain robust and scalable systems for swarm control and sensor management.
• Implement efficient communication protocols and real-time processing solutions for robotics.
• Collaborate closely with cross-functional teams to integrate backend components with robotics software and sensor networks.
• Optimize system performance, scalability, and reliability in a distributed robotics environment.
• Solve challenging problems using modern programming languages such as C++ and Rust.
• Participate in code reviews, architecture discussions, and software design decisions.

What you bring to the team:

• 5+ years of professional experience in backend development with a strong focus on real-time systems.
• Proficiency in Rust and C++, with a solid understanding of modern software development practices.
• Experience in building and optimizing backend architectures for distributed systems.
• Familiarity with network protocols, multithreading, and low-latency data processing.
• Knowledge of system architecture design, performance optimization, and resource management.

• Ability to work independently, solve complex technical problems, and thrive in a fast-paced startup environment.

   

Nice-to-Have:

• Experience in robotics, swarm control, or sensor integration.
• Familiarity with cloud platforms, Docker, or Kubernetes for scalable deployments.

• Understanding of embedded systems or real-time operating environments.

   

Why Quantum-Systems:

• We Stand with Ukraine
• We believe in the power of combined efforts: straightforward tech expertise paired with a customer-centric focus.
• We are industry pioneers who are ambitious, bold, and visionary.
• We push limits, think outside the box, and strive for technological excellence to shape the future of aerial data.
• We promise to be your runway for individual and professional growth.

As a Lead Embedded Software Engineer you are a key part of our Architecture team to develop and implement the core features and functionalities to have our drones operate safely and autonomously in the air.
 

Together with our world-class team, currently seven team members, you will take an empowering role: pushing the boundaries of drone technologies. You will be working closely with stakeholders in Germany and US from the System architecture and Hardware development departments.
 

This is a full-time office job. Candidates must be located in Kyiv.
 

What is your Day to Day Mission:

• Lead a team of embedded engineers
• Implementation, maintenance, and optimization of the Quantum-Systems autopilot firmware and firmware stack
• Design, Conception, implementation, and testing of new autopilot functionalities
• Export of flight control and navigation algorithms from Matlab / Simulink and integration into the autopilot’s embedded framework
• Implementation, maintenance, and optimization of BSP / peripheral and external sensor drivers and their optimized operation in the scope of the real-time operating system
• Building, documenting, and maintaining autopilot firmware for flight tests. Creation of flight test tickets, support of flight tests, and post-flight data analysis
• Creating unit tests, debugging/tracing of the code base for code coverage/functionality testing
• Maintenance of the firmware update eco system, including bootloaders & firmware updates
• Support in the implementation and maintenance of production tools

What you bring to the team:

• You have completed a degree in the field of bachelor’s or master’s degree in software engineering / electrical engineering and you have several years of experience working with embedded systems.
• You have a deep understanding of embedded systems and you are a senior in designing, implementing and optimizing embedded systems.
• You have strong knowledge of microcontrollers (ARM, Cortex-M), real-time operating systems and hardware and communication interfaces interfaces (UART, I2C, SPI, CAN, ETH ...)
• You are experienced with real-time operating systems like FreeRTOS or uCOS II and knowledge of multi-threading, task scheduling, and inter-task communication.
• You have the ability to bridge the gap between hardware and software, understanding the electrical and physical constraints, profound understanding of electronic schematics and efficiently utilizing available hardware resources
• You master version control and collaboration tools such as git and gitlab and you have experience in working in collaborative development environments with agile methodologies.
• You are highly self-motivated and drive your area of responsibility independently
• Due to your open, communicative, friendly, and competent attitude, it is easy for you to be considered as an internal expert

• English level at least B2

   

Why Quantum-Systems:

• We Stand with Ukraine!
• We believe in the power of combined efforts: straightforward tech expertise paired with a customer-centric focus.
• We are industry pioneers who are ambitious, bold, and visionary.
• We push limits, think outside the box, and strive for technological excellence to shape the future of aerial data.
• We promise to be your runway for individual and professional growth.