Jobs Developers

Lead Backend Developer (Node.js / Microservices) — iGaming / Casino

We're looking for a senior backend engineer who thrives in high-load, real-time environments. We operate in the online casino and iGaming industry — if you have experience in this space, you're already a step ahead. This is a hands-on leadership role for someone who has built and scaled production systems — and knows how to keep them running under pressure.

Key Responsibilities

▸ Design, build, and maintain scalable backend services and REST APIs ▸ Lead architecture decisions across distributed microservices systems ▸ Own real-time communication infrastructure (WebSockets, NATS, Kafka) 

▸ Ensure system reliability, observability, and fault tolerance at scale 

▸ Optimize database performance and handle high-volume data challenges 

▸ Set technical standards and mentor the engineering team ▸ Debug and resolve production issues under pressure

Required Technical Experience

Backend 

✔ 5+ years of professional backend development 

✔ Strong expertise in Node.js, TypeScript, JavaScript (ES6+) 

✔ Experience building scalable REST APIs and real-time services 

✔ Deep understanding of async programming and event-driven architectures

Microservices 

✔ Proven experience designing distributed microservices environments 

✔ Service communication patterns, fault tolerance, horizontal scaling 

✔ Observability, monitoring, and high-traffic production systems

Messaging & Streaming — all three are mandatory 

✔ NATS 

✔ Apache Kafka 

✔ WebSockets / real-time communication systems

Must understand: Pub/Sub, streaming pipelines, message durability, consumer groups, event orchestration, reconnection strategies, real-time sync

DevOps & Infrastructure — mandatory 

✔ Kubernetes (K8s) and Docker 

✔ CI/CD pipelines and containerized production environments

Strong advantage: DigitalOcean Kubernetes (DOKS), Helm, Ingress management, Cloudflare, Linux server administration

Databases 

✔ MySQL and PostgreSQL — production experience 

✔ Query optimization, indexing, partitioning, caching strategies 

✔ Redis and experience with large datasets and performance bottlenecks

Frontend — advantage React, Next.js, Material UI, real-time frontend integrations

Additional Requirements

✔ Experience on high-scale platforms with significant live traffic 

✔ Strong architectural thinking and problem-solving skills 

✔ Experience in real-time gaming, fintech, sportsbook, casino, or similar high-load environments — major advantage 

✔ Strong understanding of security, scalability, and system reliability 

✔ Experience in agile, fast-moving development teams

Compensation

💰 Fixed salary — discussed individually 🌍 Fully remote 🎰 Industry: online casino / iGaming

👉 We're looking for someone who has been there — built it, scaled it, and kept it running in a high-stakes, high-traffic environment. If that's you, we want to talk.

Project Description

We are developing a cybersecurity platform that analyzes how well data and systems are protected and whether they comply with international security standards.

The platform is built as a microservices-based system, where independent services handle data processing, integrations, and business logic. The frontend provides a user-friendly interface for managing and visualizing results.

We use modern technologies including Python (FastAPI), React + TypeScript, AWS, and Docker, with a focus on scalability, asynchronous processing, and cloud-based infrastructure.

We are looking for a Full-stack Developer to join our team and contribute to both backend services and frontend development.
 

Responsibilities
- Develop and maintain backend microservices FastAPI
- Build and enhance frontend features using React + TypeScript
- Integrate frontend with backend APIs and external services
- Work with data processing, business logic, and system integrations
- Participate in architecture discussions and feature development
- Write and maintain tests (unit and e2e)

Required skills
- 1+ years of commercial experience as a Full-stack or Software Developer
- Experience with Python (FastAPI)
- Experience with JavaScript/TypeScript and React
- Understanding of REST API design and integration
- Experience with relational databases (PostgreSQL) and ORM (SQLAlchemy or similar)
- Basic knowledge of cloud platforms (AWS)
- Experience with Docker and Git
- Understanding of testing approaches (unit/integration/e2e)
- English level: Upper-intermediate or higher

Will be a plus
- Experience with microservices architecture
- Familiarity with tools like React Query, Zustand, MUI
- Experience with Playwright, Vitest, Storybook
- Understanding of asynchronous processing (queues, workers)
- Experience with API clients (OpenAPI, Axios)
 

We offer
- Opportunities for career growth and personal development, to help you improve your skills and achieve your goals
- No micromanagement - your ideas and initiatives are always encouraged
- Educational programs that are covered by the company at 30% of the expense
- Paid vacation leave and public holidays (21 vacation days annually)
- Competitive financial compensation with regular performance reviews
- Outdoor team activities are paid for by the company
- English language improvement through extensive communication
- The chance to work alongside highly experienced and enthusiastic IT professionals who are ready to share their knowledge and help you gain invaluable experience in a live IT environment
 

Our hiring is quick and straightforward
- Test task 
- Technical interview with a hiring manager (1.5 hours)

About the project

We're building a smart customer behavior analytics platform for an e-commerce / retail business. A starter project is already done — we need an experienced developer to continue and expand it with new AI-powered video analytics features. Long-term engagement, 3+ months, with continuation after successful milestones.
 

What you'll be working on

• Face recognition & detection — identify returning customers
• Emotion detection — happy, neutral, surprised, confused, dissatisfied
• Age estimation & gender detection
• Object detection & tracking — products, shelves, zones, promotional areas
• Real-time / near-real-time video processing
• Detection overlays and analytics dashboard
• Customer emotion trends, demographic summaries, interaction heatmaps
• Camera input and/or uploaded video support
• Code review and improvement of existing codebase
   

Required skills

• Python, OpenCV
• YOLO (v8 preferred), DeepFace, InsightFace, and/or MediaPipe
• Face recognition and emotion detection in production
• Real-time video streaming (WebSockets / RTSP)
• Backend API development (FastAPI or Flask)
• Frontend integration — dashboards with live overlays
• Docker, GPU inference

Nice to have

• TensorRT / Triton for inference optimization
• Experience with retail or surveillance analytics systems
• Dashboard development (React or similar)

We offer

• Long-term project with stable workload

• Clear scope and existing codebase to build on

   

🔹Who we are!

At Levi9, we are passionate about what we do. We love our work, and together in a team, we are smarter and stronger. We are looking for skilled team players who make change happen. Are you one of these players?

🔹About the project

Backbase is a Dutch banking software and financial technology company that provides a banking infrastructure software platform that it calls engagement banking. The system is used by financial institutions globally, from large banks to credit unions and community banks.
 

🔹Requirements

• 5+ years of hands-on experience building and maintaining complex Android applications in production environments.
• Experience in the banking or financial domain is a strong plus.
• Skilled at translating high-level business requirements into secure, scalable, and maintainable technical solutions.
• Strong engineering mindset and follow modern Agile practices throughout the entire software development lifecycle.
• Continuous Integration and Continuous Deployment (CI/CD) are part of your core workflow, ideally using tools like Bitrise or GitHub Actions.
• Mobile development expert who’s always ready to share best practices and lead by example — not just follow them.
• Strong technical expertise in Android architecture patterns such as MVI or MVVM.
• Experience with Jetpack Compose (at least on pet projects) and understanding of its role in modern Android UI development.
• Deep knowledge of Kotlin, especially Coroutines and Flows, and how to use them effectively in real-world applications.
• Solid grasp of Dependency Injection, with hands-on experience using frameworks like Koin (or similar).
• Strong understanding of Android security best practices, including SSL Pinning, secure data storage, encryption, etc.
• Hands-on proficiency with AI tools like GitHub Copilot, Cursor, and Claude Code.
• Practical experience with agents, skills, MCP servers, and agentic SDLC.

• Practical AI leverage for increasing productivity

   

🔹9 reasons to join us:

1. Today we're working with the technology of tomorrow.
2. We don't wait for a change. We are the change.
3. We're experts in creating experts (Levi9 academy, Lead9 program for leaders).
4. No micromanagement. We are free birds with a clear understanding of what the high performance is!
5. Learning in Levi9 never stops (unlimited Udemy for business, meetups, English courses, professional training).
6. Here you can train your body and mind.
7. We've gathered the best locations - comfortable, cosy, and pet-friendly offices in Kyiv (5 minutes from Olimpiyska subway station) and Lviv (5 minutes from the Opera Theatre), with regular offline internal events
8. We have a master's degree in work-life balance.
9. We are actively supporting Ukraine with constant donations and volunteering

🔹Simple hiring steps:

• Intro Meeting with recruiter
• Levi9 Technical Interview
• Customer Interview 

🌎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.

Requirements:

Must have:

• 0–1 year of commercial experience (internships and strong pet projects count)
• Working knowledge of C# and .NET 6/7/8
• Basics of ASP.NET Core and REST APIs
• SQL fundamentals and Entity Framework Core
• Git basics (branching, pull requests, merging)
• English B1+ for reading docs and team communication

Nice to have:

• Azure (App Service, Functions, DevOps)
• Unit testing (xUnit / NUnit, Moq)
• Docker and CI/CD basics
• Common design patterns and Dependency Injection

Overlap: stay available until 7 PM CET

Working conditions and benefits:

• Flexible working schedule: 8 hours per day, 40 hours per week
• Paid vacation, sick leave (without a 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
• 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.

Step into your future – apply now 🚀 and send us your CV.

We are looking for an experienced ServiceNow Developer to join a long-term contract project focused on enhancing and optimizing enterprise ServiceNow environments. The role requires strong hands-on expertise across the platform, particularly in Discovery, Service Mapping, CSDM, and platform automation. You will collaborate with cross-functional teams to design, build, and integrate ServiceNow solutions that improve operational visibility and streamline IT service management processes.

Details

Location: Remote (Europe)
Employment Type: Contract
Contract Duration: Initial 12 months (strong potential for long-term extension)
Start Date: ASAP
Language Requirements: Fluent English

Key Responsibilities

Develop, configure, and customize ServiceNow applications and platform modules

Implement and optimize Discovery, Service Mapping, and CSDM frameworks

Build and maintain integrations using REST and SOAP APIs

Develop advanced automation using client scripts, business rules, workflows, and Flow Designer

Support and optimize ITSM modules including Incident, Problem, Change, Service Catalog, and Portal

Collaborate with stakeholders to gather requirements and translate them into scalable technical solutions

Troubleshoot, debug, and resolve issues across the ServiceNow ecosystem

Ensure platform performance, maintainability, and adherence to best practices

Requirements

5+ years of experience as a ServiceNow Developer

Strong expertise with ServiceNow Discovery, Service Mapping, and CSDM

Proven experience building ServiceNow integrations using REST/SOAP APIs

Solid scripting and automation experience using JavaScript and ServiceNow development frameworks

Hands-on experience with ITSM modules (Incident, Problem, Change, Service Catalog, Portal)

ServiceNow Certified System Administrator (CSA) certification

Strong troubleshooting and platform optimization skills

Excellent communication skills and ability to work in distributed teams

Fluent English

Nice to Have

ServiceNow Certified Application Developer (CAD)

Experience with CMDB architecture and governance

Experience working in enterprise-scale ServiceNow environments

Familiarity with DevOps practices and CI/CD for ServiceNow

Softsich is a young and ambitious international product tech company that develops scalable B2B digital platforms. We’re looking for an ERP Developer (Python) — someone with a strong Python background and an interest in ERP systems, who is eager to grow within the ERPNext/Frappe ecosystem.

This role will be especially interesting for those who want to move beyond classic backend development into building business-critical systems: process automation, integrations, financial and HR workflows. There will be plenty of space for growth, ownership, and technical influence.
 

Your key responsibilities will include:

— Developing and maintaining custom solutions using Python and the Frappe Framework.
— Configuring and developing ERPNext according to the company’s business processes.
— Working with integrations via REST API.
— Participating in the development of internal automation flows and ERP logic.
— Extending ERP system functionality and maintaining solution stability.
— Working with Accounting and HR-related modules.
— Collaborating with business teams to improve processes and systems.
— Participating in technical and architectural decisions.
 

It’s a match if you have:

— Commercial experience with Python 3+.
— Strong understanding of backend development and API integrations.
— Experience working with SQL databases (MariaDB/MySQL/PostgreSQL).
— Understanding of clean code principles and OOP.
— Experience working with Git.
— Interest in ERP systems and business process automation.
— Willingness to grow within the ERPNext/Frappe ecosystem.
 

Nice to have:

— Experience working with ERP systems (ERPNext, Odoo, BAS, SAP, etc.).
— Understanding of Accounting / HR / Payroll processes.
— Experience working with REST APIs and integrations.
— JavaScript or frontend scripting experience.
— Docker / CI/CD / cloud infrastructure experience.
 

What we offer:

— Flexible schedule and remote format or offices in Warsaw/Kyiv — you choose.
— Opportunity to deeply dive into the ERPNext/Frappe ecosystem and grow toward ERP Engineer / ERP Architect paths.
— Real impact on internal business processes and ERP system development.
— Strong product team and environment without micromanagement.
— 24 paid vacation days, sick leaves, and health insurance (UA-based, other locations in progress).
— Coverage for professional events and learning.
— Zero joules of energy to the aggressor state, its affiliated businesses, or partners.
 

If you’re interested in moving beyond “just backend” and into building systems that truly drive business — we’d love to get to know you 🙌

Send over your CV now — let’s get acquainted!

Job Summary

Our embedded software engineering team's mission is to craft reliable, high-performance solutions that reach millions of homes worldwide within the home security market. We follow agile development methodologies with regular sprint cycles, code reviews, and continuous integration practices. The team's established approach emphasizes comprehensive testing, rigorous security standards, and close collaboration with hardware engineering, product management, and customer support teams. We pride ourselves on writing clean, maintainable code and fostering a culture of knowledge sharing and technical excellence.

We're seeking a skilled C++ Embedded Engineer to take ownership of critical software components in our camera-based security devices. This role involves maintaining existing products through comprehensive debugging and bug fixing, as well as developing innovative new features.

Responsibilities and Duties

— Design, develop, and maintain high-quality embedded software in C++ for camera-based security devices.

— Debug and resolve complex software, hardware, and network connectivity issues across the entire software stack.

— Develop new features and improve existing codebases for the product line.

— Optimize software performance for resource-constrained embedded environments.

— Conduct code reviews and provide technical mentorship to team members.

— Participate in architecture discussions and technical decision-making processes.

— Collaborate with QA teams to develop comprehensive testing strategies.

— Document software designs, APIs, libraries, and troubleshooting procedures.

Qualifications and Skills

— At least 5+ years of commercial experience in embedded development, with expertise in C++ (C++17 standard) and deep knowledge of RTOS and microcontroller architectures (ARM, RISC-V).

— Proficiency in the full SDLC, including professional engineering practices like Git, CMake, code reviews, and continuous integration.

— Solid understanding of network programming and experience with multithreading on multicore microcontrollers.

— Expertise in communication interfaces (I2C, SPI, UART, and Wi-Fi) and experience writing device drivers and libraries.

— Hands-on experience with hardware troubleshooting and debugging tools (oscilloscopes, logic analyzers, etc.) and cross-compilation tool chains.

— Ability to work independently and take ownership of complex projects.

— Excellent communication skills for technical discussions and documentation, with a collaborative mindset for cross-functional team environments.

— At least an Intermediate level in both written and spoken English (B1).

Nice to have

— Experience with Python for scripting and automation

— Experience with C in embedded development

— Understanding of security protocols and encryption methods

— Experience using AI-powered tools to enhance productivity and code quality

We offer multiple benefits that include

— The environment of equal opportunities, transparent and value-based corporate culture, and an individual approach to each team member.

— Competitive compensation and perks. Annual performance review.

— Opportunity to receive a Performance Bonus for your individual achievements and a Loyalty Bonus recognizing your dedication to the company.

— Gig-contract.

— 21 paid vacation days per year, paid public holidays according to Ukrainian legislation.

— Development opportunities like corporate courses, knowledge hubs, and free English classes as well as educational leaves.

— Medical insurance is provided from day one. Sick leaves and medical leaves are available.

— Remote working mode is available within Ukraine only.

— Free meals, fruits, and snacks when working in the office.

We are looking for a Senior or Lead Software Development Engineer to join a cloud data platform initiative focused on managed Kafka connectors. The role centers on accelerating onboarding of first-party connectors, improving reliability and launch readiness, and helping expand a managed connector ecosystem used in data-intensive cloud services.

Tasks

• Accelerate onboarding of new first-party managed Kafka connectors;
• Improve connector quality, reliability, and operational readiness;
• Integrate authentication and platform-specific cloud requirements;
• Translate connector behavior into implementation details, UI specs, and documentation inputs;
• Support launch gates such as probers, load testing, playbooks, and launch reviews.

Responsibilities

• Strong Java experience, as the core workers and connectors are implemented in Java;
• Practical Go experience for API-facing changes and service integration work;
• Practical experience with GCP cloud;
• Experience integrating, debugging, and improving connector-based or data integration systems;
• Ability to work across performance, stability, authentication, and network-compatibility concerns;

• Strong engineering ownership across delivery, launch readiness, and operational quality.

   

Nice to Have:

• Experience with Kafka Connect ecosystems;
• Experience with CDC-oriented connectors or sink/source integrations;

• Exposure to cloud data systems such as BigQuery, Spanner, Bigtable, Iceberg, or Debezium-based workflows.

   

Engagement Type

• B2B contract.

   

Location / Timezone

• Priority location is Krakow, Poland;
• On-site presence at the Akvelon office

We are looking for a Senior or Lead Software Development Engineer to join a cloud data platform initiative focused on managed Kafka connectors. The role centers on accelerating onboarding of first-party connectors, improving reliability and launch readiness, and helping expand a managed connector ecosystem used in data-intensive cloud services.

Tasks

• Accelerate onboarding of new first-party managed Kafka connectors;
• Improve connector quality, reliability, and operational readiness;
• Integrate authentication and platform-specific cloud requirements;
• Translate connector behavior into implementation details, UI specs, and documentation inputs;
• Support launch gates such as probers, load testing, playbooks, and launch reviews.

Responsibilities

• Strong Java experience, as the core workers and connectors are implemented in Java;
• Practical Go experience for API-facing changes and service integration work;
• Practical experience with GCP cloud;
• Experience integrating, debugging, and improving connector-based or data integration systems;
• Ability to work across performance, stability, authentication, and network-compatibility concerns;

• Strong engineering ownership across delivery, launch readiness, and operational quality.

   

Nice to Have:

• Experience with Kafka Connect ecosystems;
• Experience with CDC-oriented connectors or sink/source integrations;

• Exposure to cloud data systems such as BigQuery, Spanner, Bigtable, Iceberg, or Debezium-based workflows.

   

Engagement Type

• B2B contract.

   

Location / Timezone

• Priority location is Krakow, Poland;
• On-site presence at the Akvelon office

🔹Who we are!

At Levi9, we are passionate about what we do. We love our work and together in a team, we are smarter and stronger. We are looking for skilled team players who make change happen. Are you one of these players?

🔹About the project

Backbase is a Dutch banking software financial technology company that provides a banking infrastructure software platform that it calls engagement banking. The system is used by financial institutions globally from large banks to credit unions and community banks.
 

🔹Requirements

• 5+ years of hands-on experience building and maintaining complex Android applications in production environments.
• Experience in the banking or financial domain is a strong plus.
• Skilled at translating high-level business requirements into secure, scalable, and maintainable technical solutions.
• Strong engineering mindset and follow modern Agile practices throughout the entire software development lifecycle.
• Continuous Integration and Continuous Deployment (CI/CD) are part of your core workflow, ideally using tools like Bitrise or GitHub Actions.
• Mobile development expert who’s always ready to share best practices and lead by example — not just follow them.
• Strong technical expertise in Android architecture patterns such as MVI or MVVM.
• Experience with Jetpack Compose (at least on pet projects) and understanding of its role in modern Android UI development.
• Deep knowledge of Kotlin, especially Coroutines and Flows, and how to use them effectively in real-world applications.
• Solid grasp of Dependency Injection, with hands-on experience using frameworks like Koin (or similar).
• Strong understanding of Android security best practices, including SSL Pinning, secure data storage, encryption, etc.
• Hands-on proficiency with AI tools like GitHub Copilot, Cursor, Claude Code.
• Practical experience with agents, skills, MCP servers, agentic SDLC.
• Practical AI leverage for increasing productivity

🔹9 reasons to join us:

1. Today we're working with the technology of tomorrow.
2. We don't wait for a change. We are the change.
3. We're experts in creating experts (Levi9 academy, Lead9 program for leaders).
4. No micromanagement. We are free birds with a clear understanding of what the high performance is!
5. Learning in Levi9 never stops (unlimited Udemy for business, meetups, English courses, Professional trainings).
6. Here you can train your body and mind.
7. We've gathered the best locations - comfortable, cozy and pet-friendly offices in Kyiv (5 minutes from Olimpiyska subway station) and Lviv (5 minutes from the Opera Theatre) with regular offline internal events
8. We have master's degree in work-life balance.
9. We are actively supporting Ukraine with constant donations and volunteering

We are looking for an experienced Senior Java Full Stack Engineer to join our development team.

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

Responsibilities:

• Hands-on full-stack development of innovative applications
• Owning the entire development cycle, including design, architecture, development, and DevOps

• Working in XP with Remote pairing

   

Requirements:

• BS degree in Computer Science or equivalent combination of education and experience
• 5-6+ years of full-stack development
• 5-6+ years of experience in the following technologies: Java, Spring
• Experience with Functional Programming and Java Streams
• 2+ years of experience in front-end development with React
• Experience with developing a reactive UI (Reactive JS)
• 2+ years of experience in TDD/BDD development in the following frameworks: Junit, Jasmin, Mockito, Protractor/Selenium
• 2+ years of experience in micro-services-based architecture and tools (Spring Boot/Cloud)
• Experience in DevOps development and Jenkins
• Experience in development in Kotlin – an advantage
• Experience in designing, developing, and deploying cloud/hybrid-based solutions
• Experience in developing and deploying in container-based environments (Kubernetes, Cloud Foundry)
• Familiarity with the following design concepts: micro-services, service discovery, circuit breaker
• Self-starter with the ability to appropriately prioritize and plan complex work in a rapidly changing environment
• Versatility and the capability to switch easily between different tasks and technologies
• Experience in assessing a broad range of information solutions and products
• Strong critical thinker with problem-solving aptitude

• Good English - verbal and written

   

We offer*:

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

*not applicable for freelancers

Mate academy is an EdTech company helping anyone, anywhere build a successful career through learning.

Our gamified, AI-powered platform helps people gain new skills and get ready for tech and non-tech roles – in IT and beyond.

We’re growing fast in Ukraine, Poland, and Brazil and 6000+ people worldwide have already landed jobs after studying at Mate. 

We are looking for an Fullstack Team Lead — an experienced technical specialist who combines development expertise with marketing experience, and team management skills. This role is critical to our market growth: your decisions will shape how prospective students discover us, move through the purchase journey, and become part of Mate academy.

What makes this role exciting:

• End-to-end ownership: landing pages, funnels, payments, analytics.
• Building interactive growth products (custom forms, promos, experiments).
• Opportunity to build internal tools (e.g. our own Typeform alternative).
• Fast delivery with real business impact.
• Direct collaboration with marketing, product, and sales.
• You will directly impact how users discover Mate, go through funnels, and convert into students.

Required skills:

• 5+ years of software development experience.
• Experience with web analytics tools (Google Analytics, Google Tag Manager, or equivalent).
• Solid understanding of A/B testing methodology.
• Experience with any front-end framework and Node.
• Hands-on experience building and optimizing landing pages and marketing funnels.
• Leadership, mentoring experience, or willingness to develop in this direction.
• English level: Upper-Intermediate.

Nice-to-have skills:

• Experience with analytics tools (Amplitude, GrowthBook, Looker) and integrating payment providers (Stripe or similar)
• Experience supporting marketing events (webinars, marathons, product launches).
• Familiarity with conversion rate optimization and funnel analytics.
• Experience with headless CMS (Strapi) or landing page builders.

Key responsibilities:

• Lead and grow an acquisition team of 3 junior devs.
• Stay hands-on: build and optimize processes, integrations.
• Own technical decisions for acquisition systems.
• Standardize and scale landing page production .
• Improve analytics setup and tracking across all funnels.
• Bring structure to content systems (Strapi, landing builders).
• Implement AI best practices into team workflows.
• Identify bottlenecks and continuously improve processes.

We offer:

• A collaborative and dynamic team with opportunities to contribute creatively.
• A no-bullshit culture with 0% bureaucracy.
• Paid vacation and sick days.
• Hybrid working model (3 days office / 2 days remote).
• Cozy office in Kyiv with a bomb shelter for emergencies.
• Performance/salary reviews every 6-12 months.
• Paid lunches (when working from the office).
• Access to English courses and a learning budget.
• Apple equipment for comfortable work.

Recruitment process:

1. Call with the recruiter
2. Tech interview with Tech Lead
3. Culture fit interview with the CTO and CEO

Data Science UA is a service company with deep expertise in AI and Data Science. Our story started in 2016 with the first Data Science UA Conference in Kyiv, and since then, we’ve built one of the largest AI communities in Europe.

About the role: 
We are looking for a Full Stack Engineer to join the CTO Office and take ownership of our client’s product development lifecycle. You'll work hand-in-hand with the CTO Office team, taking initiatives that have been validated as POCs and leading them into production-grade, scalable solutions.

Responsibilities:
- Take validated POCs from the CTO Office and architect, build, and ship them as production-ready applications
- Design and develop full-stack solutions — modern frontends paired with robust, scalable backends
- Build and deploy within the AWS ecosystem (Lambda, ECS/EKS, DynamoDB, S3, RDS, API Gateway, CDK/CloudFormation, and more)
- Own the CI/CD pipeline — design, build, and maintain automated workflows using GitHub Actions
- Design and build internal agentic AI solutions using LangChain and LangGraph — from multi-step agent orchestration to RAG pipelines and tool-augmented workflows
- Leverage Agentic IDE tools (Cursor, Claude Code, and similar) as a core part of your development workflow, applying best practices around skills, MCPs, agents, and prompt engineering to accelerate delivery
- Collaborate closely with the CTO Office, product stakeholders, sales, and pre-sales teams to translate business needs into elegant technical solutions 
- Make pragmatic technology decisions that balance speed, quality, and maintainability

Requirements:
Must-Have:
- 5+ years of professional full-stack development experience
- Frontend: Strong proficiency with Vue.js or React (with modern tooling such as Nuxt/Next.js, TypeScript, Vite, Tailwind CSS)
- A builder's mindset — you thrive on taking something from prototype to production
- Understanding of system design principles — you can architect scalable, reliable distributed systems and make sound trade-offs
- Grasp of data structures and design patterns — to work alongside your Agentic IDE you write efficient, well-structured code
- Backend: Solid experience with Python and modern frameworks — primarily FastAPI, or Django/Flask
- Hands-on experience with the AWS cloud ecosystem — you've built and deployed real workloads on AWS
- Hands-on experience building agentic AI systems with LangChain and LangGraph — including multi-agent orchestration, tool use, and RAG patterns
- Proven experience designing and maintaining CI/CD pipelines with GitHub Actions including automated PR based Code Reviews.
- Working knowledge of Agentic IDEs and AI-assisted development (Cursor, Claude Code, Windsurf, or similar) — including familiarity with skills, MCP servers, agents, and AI-driven development best practices
- Strong understanding of RESTful API design, relational and NoSQL databases, and cloud-native architecture patterns

Nice-to-Have:
- Experience with Amazon Bedrock and/or Azure AI Foundry for building and deploying AI/ML solutions on managed cloud platforms
- Experience with Infrastructure as Code (AWS CDK, Terraform, CloudFormation)
- Experience in security infrastructure (IDP, authentication protocols - S) and writing secured applications 
- Security & Identity - understanding of application security, including SSL/TLS certificates, secret management, and identity providers (IDP). Experience implementing authentication and authorization protocols such as SAML, OAuth2, and JWT.
- Foundational SRE knowledge, including monitoring, logging, and observability (e.g., CloudWatch, Prometheus, ELK) to ensure production stability and performance.
- Familiarity with FinOps concepts, cloud cost management, or multi-cloud environments
- Experience building data-driven tools — predictive models, analytics dashboards, or recommendation engines
- Exposure to Azure services alongside AWS
- Experience with containerization and orchestration (Docker, Kubernetes)
- Background in B2B SaaS or enterprise software development

Ever worked in an environment where engineers are expected to challenge bad code instead of silently accepting it?
Where spotting hidden bugs, architectural problems, and security risks matters more than shipping features fast?
Where your opinion is valued specifically because you can say: “this implementation is wrong and here’s why”?

If you’re confident reviewing unfamiliar systems, care deeply about engineering quality, and prefer direct technical communication over corporate politeness - this role is for you.

About the Company

Our client is a Switzerland-based trading technology company building a stock trading platform used for real-time trading operations and financial workflows.

The platform includes: real-time market data, order entry & order management, portfolio management, watchlists & alerts, trading dashboards, internal CRM systems.

The Role

We’re looking for a Senior Software Engineer focused on architecture review, code quality, reliability, and technical evaluation across multiple systems.

This is not primarily a feature-development role.

You’ll work with existing production systems, reviewing and evaluating code written in Python, TypeScript/React, and partially Rust-based environments.

What You’ll Do

Review & Evaluate Engineering Quality

• Analyze backend and frontend codebases critically
• Review architecture using Clean Code, SOLID, and DDD principles
• Detect technical debt and maintainability risks
• Evaluate pull requests and engineering decisions

Hunt Bugs & Reliability Problems

• Detect race conditions and async issues
• Identify off-by-one errors, null/None problems, and memory leaks
• Review concurrency behavior and hidden edge cases
• Identify production risks early

Improve System Performance

• Analyze scalability and Big-O complexity
• Detect N+1 queries and inefficient backend logic
• Identify unnecessary React re-renders
• Find bottlenecks affecting reliability or responsiveness

Review Security & Infrastructure Risks

• Evaluate systems against OWASP Top 10 risks
• Detect SQL injection vulnerabilities and secret leaks
• Review unsafe input handling and path traversal risks
• Evaluate dependency vulnerabilities (CVEs)
• Review Tauri IPC sandbox/security issues

Evaluate Testing Standards

• Review pytest, vitest, and cargo test implementations
• Identify weak coverage and missing edge cases
• Evaluate TDD quality and mocking approaches
• Detect gaps between “tests passing” and real reliability

Work Across Modern Tooling

• Use ruff, mypy, eslint, and clippy
• Review Git diffs and PR workflows
• Read and evaluate API integration code
• Detect misuse of OpenAI, Anthropic, or Gemini SDKs
• Review REST/WebSocket reliability patterns (retry logic, idempotency, etc.)

What You Bring

• Strong experience as a Senior or Staff-level Software Engineer
• Deep expertise in Python 3.11+
  • Typing
  • Async programming
  • Pydantic
• Strong TypeScript 5+ and React 19 experience
• Ability to read and evaluate Rust code (Tauri 2 ecosystem)
• Strong understanding of software architecture and engineering quality
• Experience reviewing unfamiliar codebases quickly
• Strong debugging and analytical skills
• Confidence giving direct, critical technical feedback
• Ability to prioritize issues by severity (Critical / Major / Minor)
• Upper-Intermediate English or higher
• German reading skills required (comments, commits, and technical discussions may partially be in German)

Nice to Have

• Experience reviewing ffmpeg or Pillow pipelines
• Familiarity with Vector DB or ONNX-related code patterns
• Experience in trading, fintech, or high-reliability systems

What You Get

• Engineering-First Environment: Work with teams that care about architecture, maintainability, and technical correctness - not just feature velocity.
• Real Technical Influence: Your feedback will directly impact engineering standards, code quality, and technical decisions.
• Complex Systems: Trading infrastructure, async workflows, performance-sensitive systems, and real-world scalability challenges.
• Direct Communication Culture: The company values honest technical feedback, critical thinking, and engineering maturity over hierarchy or corporate formalities.
• Strong Autonomy: No micromanagement. Engineers are trusted to make technical judgments and take ownership.

Ready to Work Where Code Quality Actually Matters?

If you enjoy analyzing complex systems, identifying critical issues before production does, and working in a direct, high-level engineering environment —

👉 Apply now and help improve systems built for reliability, performance, and scale.