Jobs Node.js

Backend Developer (Node.js / TypeScript): Android Infrastructure, Reverse Engineering, High-Load

We are looking for a strong Backend Developer for a high-load project connected with Android infrastructure, reverse engineering, network traffic analysis, and processing large amounts of data.

The main backend is built on Node.js, so strong knowledge of JavaScript and TypeScript is required.

Please note: this is not a web development position. You will work with software — native Android applications, their internals, and their network communication — not with websites or browser-based web applications. Candidates without hands-on experience working with software at this level will not be considered.

Responsibilities

• Develop and maintain backend services using Node.js / TypeScript.
• Work with high-load and distributed systems.
• Design systems for storing and processing large amounts of data.
• Work with PostgreSQL, ClickHouse, and Redis.
• Optimize database queries, indexes, and data structure.
• Work with replication, sharding, partitioning, distributed data, high availability, and fault tolerance.
• Work with Kubernetes infrastructure.
• Find and fix performance problems in backend, databases, and infrastructure.
• Analyze network traffic and the communication of native Android applications.
• Work with traffic sniffing and proxy tools.
• Understand how mobile applications communicate with backend services and APIs.
• Analyze requests, responses, headers, payloads, tokens, and sessions.
• Work with existing code and systems with limited documentation.
• Find technical problems and propose solutions independently.
• Work with distributed workers, services, and nodes.

Required Skills

Software / Reverse Engineering / Network Analysis (mandatory)

• Hands-on experience with Android reverse engineering (not just theoretical understanding).
• Practical experience intercepting and analyzing traffic of native applications (mitmproxy, Burp Suite, Charles, Frida, or similar).
• Understanding of Android architecture.
• Good understanding of HTTP / HTTPS.
• Understanding of TLS, including certificate pinning and how it affects traffic analysis.
• Experience with proxy-based traffic analysis.
• Understanding of authentication, sessions, cookies, and tokens at the application level.

Backend

• Strong experience with Node.js.
• Strong knowledge of JavaScript and TypeScript.
• Good understanding of async programming.
• Understanding of the Node.js event loop.
• Experience with REST API and WebSocket.
• Experience with high-load backend systems.

Databases

• Strong experience with PostgreSQL.
• Strong experience with ClickHouse.
• Strong experience with Redis.
• Good understanding of indexes, query optimization, query plans, replication, sharding, partitioning, distributed databases, data consistency, and high availability.

Experience with large databases and high traffic is very important.

Infrastructure

• Kubernetes.
• Docker.
• Linux.
• Experience with cluster systems.
• Understanding of networking, load balancing, and horizontal scaling.
• Ability to find CPU, RAM, disk, and network bottlenecks.
• Experience with logs and monitoring.

Important: read before applying

This role is about software, not web applications.

Our backend does not serve a website or a typical web product. It supports infrastructure built around native Android applications: we analyze how the apps work, how they communicate over the network, and we process the data at scale.

This is a strict requirement:

• You must have real, practical experience working with software (native/mobile applications): analyzing app behavior, intercepting and inspecting traffic, understanding protocols, sessions, and tokens at the application level.
• Experience limited to web development (websites, admin panels, CRUD APIs for web frontends, e-commerce, CMS) is not sufficient, regardless of seniority.
• Applications without this experience are not reviewed.

The candidate should understand the full system:

application → network → backend → databases → infrastructure

The developer should be able to work independently, research technical problems, understand existing systems, and find solutions even when documentation is limited.

Level

Strong Middle / Senior Backend Developer

Will be a plus

• Large-scale data processing.
• Complex or undocumented APIs.
• Systems with many workers and nodes.
• Experience with Frida, native libraries (JNI / .so), or protocol analysis beyond HTTP (protobuf, gRPC, custom binary protocols).

We are looking for a Senior Node.js Engineer (AWS Serverless) to join the team supporting a well-established UK-based e-commerce retailer operating across the US, UK, and APAC markets under 16+ partner brands. 

The client runs a high-volume, subscription-driven commerce platform with complex multi-market business logic and is currently midway through a major platform modernisation initiative — transitioning from a legacy monolithic system to a modern MACH architecture (Microservices, API-first, Cloud-native, Headless). As part of the engineering team, you will contribute to building scalable cloud-native services and modern backend solutions using Node.js and AWS Serverless technologies, helping drive the next generation of the client’s global commerce platform.

Responsibilities:

• Build AWS Lambda microservices (Node.js/TypeScript) behind API Gateway, integrated with Commerce Tools and D365.
• Design and optimise DynamoDB data models and access patterns for high-throughput e-commerce.
• Contribute to CI/CD pipelines and collaborate with DevOps on infrastructure automation.
• Support knowledge transfer to client engineers on AWS serverless best practices.
• Delegate multi-step tasks to AI agents; review diffs, verify output, and maintain accountability for what gets committed.

Requirements:

• Experience: 5+ years in Software Development 
• Backend: Strong, production-grade proficiency in Node.js and TypeScript.
• Cloud5/Serverless: Production-grade expertise with AWS Lambda, API Gateway, and DynamoDB (not just theoretical).
• Architecture: Robust experience with microservices architecture and greenfield development.
• AI Tooling: You are a self-sufficient builder who ships fast, communicates clearly across international teams, and operates AI agents as a genuine force multiplier — delegating, verifying, and iterating, not just prompting.
• English level: Upper-Intermediate+

• Tech Stack Ecosystem (Nice-to-Have): Exposure to ECS, Commerce Tools, Netlify, Contentful, D365, or Akamai

   

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-building
• Other location-specific benefits

 Hi! We are looking for a Senior Node.js Backend Developer (Payments Platform) to join our pack at SharksCode 🦈💙
 SharksCode is a Ukrainian IT company that develops high-tech software solutions and scalable B2B platforms.
 We are looking for a Senior Node.js Backend Developer who will help build and evolve our payment platform, working on scalable backend services, distributed systems, and integrations with external financial providers. In this role, you will participate in architectural decisions, develop secure and reliable payment flows, and contribute to building resilient, high-load backend services.

We expect that you:

• Have 6+ years of commercial backend development experience with Node.js.
• Have strong commercial experience with TypeScript and a deep understanding of its type system.
• Have hands-on experience designing and developing REST APIs.
• Write clean, maintainable, well-tested, and production-ready code.
• Have experience decomposing complex business requirements into scalable technical solutions.
• Can clearly explain and justify technical decisions, trade-offs, risks, and alternative approaches.
• Have strong practical experience with PostgreSQL, including query optimization, indexing, schema design, and performance tuning under high load.
• Have hands-on experience designing and developing microservice-based distributed systems.
• Understand distributed and event-driven architectures.
• Have practical experience working with Kafka.
• Have hands-on experience using Redis.
• Have experience implementing retries, timeouts, circuit breakers, rate limiting, and backpressure mechanisms.
• Have experience integrating third-party APIs, including payment providers, PSPs, banks, KYC providers, or other external services.
• Have a solid understanding of secure software development principles.
• Have practical knowledge of OAuth 2.0, JWT, HMAC, mTLS, API authentication, and authorization.
• Can identify security vulnerabilities in code, APIs, dependencies, configurations, and system architecture.
• Have experience conducting code reviews and technical audits of backend services.
• Understand principles of protecting personal, payment, and other sensitive data.
• Have a strong understanding of HTTP/HTTPS, TCP/IP, DNS, Webhooks, and the lifecycle of network requests.
• Understand TLS/mTLS, certificate lifecycle management, rotation, and secure certificate storage.
   

Your future responsibilities:

• Design, develop, and maintain backend services for the payment platform.
• Build reliable integrations with payment providers, banks, and external financial services.
• Develop scalable microservices and distributed backend components.
• Participate in architecture discussions and contribute to technical decision-making.
• Optimize PostgreSQL performance and ensure system reliability under high load.
• Ensure backend security and compliance with engineering best practices.
• Conduct code reviews and contribute to improving engineering standards within the team.
• Collaborate closely with product, QA, and infrastructure teams to deliver reliable production solutions.
   

Nice to have:

• Experience with GraphQL or gRPC.
• Experience building payment platforms, financial services, or payment processing systems.
• Experience in iGaming, Betting, FinTech, Banking, or E-commerce domains.
• Understanding of payment lifecycle concepts such as authorization, capture, void, refund, reversal, and chargeback.
• Understanding of reconciliation, settlement, payment routing, and cascading.
• Knowledge of PCI DSS, KYC/AML, and secure payment data processing.
• Experience with observability tools such as Prometheus, Grafana, OpenTelemetry, Loki, or Jaeger.
• Experience mentoring engineers and improving engineering practices.
• Understanding of threat modeling, attack surface analysis, secrets management, and the principle of least privilege.
   

Interview stages:
🤝 Interview with Recruiter.
🧠 Technical Interview.
💙 Offer.

We offer:
🌴 24 paid vacation days, 14 sick days, and 5 days off.
⏰ Flexible start of the working day — from 9:00 to 11:00.
🏥 Medical insurance.
💰 Bonuses and performance-based rewards.
🐶 Office in the center of Kyiv — pets are welcome, we are pet-friendly.
💆 Lounge area in the office to recharge during the day.
🎾 Padel tennis, football, and training at the polygon for those who enjoy active leisure.
📚 Learning compensation, internal meetups and workshops, as well as access to the corporate LMS with courses.
🎁 Corporate currency that can be exchanged for merch, gifts, or additional benefits.

For 17 years, Alty has reached the top lists of mobile and desktop application developers for fintech, crypto, retail, banking, and tourism. Our professional expertise in UI/UX design, mobile, and web development of high-load applications used by millions of users worldwide. You know us for sure if you use Monobank, Privat24 for Business, ZakazUA, EasyPay, Kashable, or Sfera Living System. We also have a partnership with Visa and Mastercard. Our clients are enterprises and corporations that recommend us to partners. We put the customer at the heart of all we do and achieve our best together. Join us!

Requirements:

— At least 4 years of commercial experience in backend development.

— 2+ years experience in Node.js development.

— Hands-on experience using AI tools and technologies in software development.

— Experience working on enterprise-level products or complex business systems.

— Strong experience working with APIs and integrating third-party services and systems.

— Strong knowledge of JavaScript (ES6) + TypeScript.

— Experience with REST.

— Experience using Git.

— Design patterns, OOP, SOLID.

Technologies:

— Node.js

— Nest.js framework

— RDBMS (PostgreSQL, MySQL, etc.) — (db instruments and stored procedure)

— noSQL (MongoDB, etc.), cache DB (redis)

— High load systems and performance

— ORM (MikroORM, TypeORM, Sequelize, Mongoose, etc.)

— Database design (DB Normalization, De-normalization)

— Workflow management (Temporal.io etc.)

— Asynchronous systems (Queues, etc)

— AWS

— Web socket

— Tests (jest)

— Postman

— AI tools and technologies

Nice to have:
— Experience with CI/CD setup (GitlabCI)

— Knowledge of Nest.js, Kafka, and Temporal.io

Responsibilities:

— Develop the backend part for a new web and mobile platform from scratch.

— Contribute to all phases of the software development lifecycle.
 

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

— We put a healthy work-life balance first.
— Caring for physical and mental health — compensation of a psychologist and sports to choose from.
— Speaking Club and English with a teacher.
— Volunteer projects that help the state get closer to victory.
— Ability to work from one of our offices in Kyiv. And you are more than welcome to bring your pets to the office.
— A space to grow both professionally and personally. A wide variety of exciting projects, the best hardware for your work, performance reviews, educational workshops, and team coaching.
— No tiresome bureaucracy. If you need something — just ask and get it.

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

Technologies

Core:

• Node.js (Express, MongoDB)
• Python (TensorFlow, OpenCV)
• Docker, Redis, FFmpeg
• AWS (Lambda, SQS, ECS)

Additional:

• React/Next.js, WebRTC
• Machine Learning
• REST API, microservices

Example Tasks

• Build a parser for kick.com streams
• Add a “team kill” highlight in CS2
• Implement player camera detection in live video streams

Requirements

Must-have:

• 2+ years of experience with Node.js or Python
• Knowledge of microservices, MongoDB, Redis
• Git, Docker, REST API

Preferred:

• Experience with FFmpeg
• Knowledge of AWS, ML
• Understanding of the esports industry

Format & Conditions

• Salary: $2000–3500, regular reviews
• Remote, flexible schedule
• Exciting projects involving video, AI, and system scaling
• Growth opportunities to Senior/Tech Lead

Our partner is a leading B2B iGaming supplier delivering engaging casino content to regulated markets worldwide. Since 2012, they’ve been building high-quality gaming experiences through a modern cloud-native platform that powers hundreds of operator brands across multiple jurisdictions.

Their Platform Solutions team sits at the heart of that ecosystem, enabling seamless integrations between the company, operators, aggregators and platform providers.

Our partner is looking for a Senior Backend Developer who thrives in a deeply hands-on environment and enjoys being close to the code on a daily basis. This role is heavily focused on building, optimising, and scaling backend services in a high-load system where performance and reliability are critical.

You’ll be working on complex, real-time challenges at the core of their platform – improving latency, ensuring high availability, and making systems more efficient at scale. This is not a coordination-heavy role; it’s for someone who enjoys writing production code, solving tough engineering problems, and seeing the direct impact of their work.

Main Responsibilities

• Work as part of a cross-functional team owning a core product within the platform
• Design, build, and deliver new backend features end-to-end in a distributed environment
• Write high-quality, production-level code daily, contributing directly to a high-load, scalable system
• Take ownership of services handling financial transactions at scale, with a strong focus on reliability
and accuracy
• Proactively suggest and implement improvements in architecture, processes, and development
practices
• Participate in code and architectural reviews to maintain high engineering standards
• Solve complex business and technical challenges with pragmatic, efficient solutions
• Participating in on-call rotations within the squad to ensure the reliability and availability of our
systems
• Play an active role in ongoing tech transformation initiatives across the platform
• Collaborate closely with engineers, product, and other stakeholders to deliver impactful solutions
used by millions globally

Mandatory Requirements

• Solid experience with Node.js/TypeScript is ideal, but we also welcome experts in other OOP languages such as Java, Python, C++, C#, or Go.
• Strong understanding of asynchronous programming techniques
• Experience with distributed systems and messaging systems (Apache Kafka, gRPC)
• Knowledge of relational databases (MySQL, PostgreSQL), columnar databases (ClickHouse), and
NoSQL technologies (DynamoDB, MongoDB)
• Skilled in developing and maintaining end-to-end and unit tests
• Proven track record of developing production-ready solutions
• Degree in Computer Science or related field

Nice to Have

• Experience with large-scale microservices architecture.
• Good ground knowledge of Kubernetes
• Familiarity with cloud providers (especially AWS)
• Understanding of application security and industry best practices
• Understanding of enterprise development patterns
• Active performance observation
• Gambling domain experience

We offer

• Competitive Salary
• Quarterly Bonuses
• Unlimited Paid Time Off
• Unlimited Paid Sick Leave
• Remote & Flexible Working
• Private Medical Insurance
• Financial Support for Life Events
• Professional Development Budget
• International Exposure
• Regular Company Events

Blackthorn Vision is seeking a Senior Backend Developer (Node.js + Java) for an outstaff project with a global leader in energy technology. Founded in 1926 and headquartered in Houston, Texas, the company has 100,000 employees serving customers in more than 120 countries and develops software solutions for automation across the energy and industrial sectors.

You will work as part of an international team, collaborating with Blackthorn Vision specialists, client-side engineers, and management. We are looking for a self-driven team player with strong problem-solving skills, a commitment to quality, and a passion for delivering robust and maintainable software solutions. Upper-Intermediate English or higher is required for effective day-to-day communication. The position follows a regular full-time working schedule aligned with the Ukrainian time zone.

In this role, you will build and support backend services that process operational and time-series data and deliver reliable APIs and event-driven solutions. You will work with technologies such as Kafka, Azure IoT Hub, RabbitMQ, Redis, Kubernetes, and Microsoft Azure to develop high-performance, resilient, and scalable applications.

Required Qualifications:

• 4+ years of professional software development experience.
• Strong hands-on experience with Node.js and TypeScript, Java and Spring Boot.
• Experience with Microservices Architecture, Event-Driven Architecture, and REST APIs.
• Strong understanding of system architecture and business requirements.
• Hands-on experience with Kafka and RabbitMQ.
• Experience with PostgreSQL, Cassandra, Redis, or similar relational/NoSQL databases.
• Experience with Docker, Kubernetes, Microsoft Azure, and Azure IoT Hub.
• Experience with CI/CD, DevOps practices, and modern observability tools.
• Experience using AI-assisted development tools such as GitHub Copilot, Microsoft Copilot, Cursor, or similar.

• Excellent problem-solving, communication, and collaboration skills.

   

Nice to have:

• Experience working with operational and time-series data.

• Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or a related field.

   

We Offer:

• Exciting and challenging work in a friendly and professional environment.
• Excellent career opportunities and competitive salary.
• Flexible work schedule.
• Professional development program with internal seminars on technical topics.
• Courses, certifications, and access to the corporate library.
• Free English classes.
• 18 working days of paid vacation, 5 full-paid sick leave days, paid public holidays.
• Medical insurance.
• Maternity leave.
• IT club membership.
• Employee referral program.
• Recognition program with gifts and awards.
• Pet-friendly and eco-friendly.
• Direct and easy communication with management.

We're looking for a Middle+/Senior Backend Developer - first and foremost a strong, well-rounded backend engineer. The role splits roughly 70/30: 70% designing and maintaining our external integrations (casino operators and partner platforms), 30% general backend/platform work and system design.

🚀 What you'll do

• Design, build, and maintain integrations with casino operators and partner platforms (wallet/transaction APIs, game launch, and reporting contracts), owning the full lifecycle from contract design to production monitoring;
• Build resilient integration layers: retries, idempotency, timeouts, error mapping, and graceful degradation when a third party misbehaves;
• Contribute to core backend services and platform features - APIs, messaging flows, data models, shared modules;
• Take part in slot game development on our game logic platform - implementing game mechanics and mathematics alongside the core team;
• Define and improve integration testing practices: contract testing, mocking/stubs, e2e, and stress/load testing;
• Work closely with Game Logic, Product, and DevOps teams to keep integration contracts stable as the platform evolves;
• Participate in code reviews, technical decisions, and architecture discussions across the backend.

🧩 What you bring

• 3-5+ years of backend development experience with Node.js + TypeScript, including ownership of non-trivial systems;
• Proven experience designing and maintaining external integrations (REST/HTTP, XML/SOAP, RPC-style, or webhook-based);
• Solid understanding of modular, service-oriented backend architecture, ideally from enterprise or scale-up environments;
• Practical experience with message brokers (RabbitMQ or Kafka) and event-driven, queue-based design;
• Strong grasp of integration testing approaches: contract testing, mocking, e2e, and stress testing;
• Confident with PostgreSQL and Redis, CI/CD, Git, and monitoring/observability tools (Grafana, Loki, Tempo);
• Comfortable with AWS, Docker, and Kubernetes for containerized deployments.

💎 Nice to have

• Experience in iGaming, gambling platforms, or RNG/game provider integrations;
• Familiarity with ArgoCD and GitOps workflows.

🎁 Benefits

• 21 vacation days + 2 extra day-offs annually;
• 12 paid sick days;
• Fully remote format - work from anywhere you feel productive;
• Flexible schedule: start your day anytime between 08:00-11:00 CET;
• Fixed budget for health insurance and gym/fitness;
• Provided all required work equipment;
• Zero bureaucracy and direct communication with founders and C-level;
• Minimal meetings, async-friendly workflow;
• Startup energy: fast motion, creativity, and tight-knit communication;
• Business trips and team meetups several times per year;
• Multiple salary payout options (flexible formats);
• …And many more perks unlocked after we hit break-even.

Our promotional features team is seeking a Senior Backend Engineer. This role is focused on developing and optimising promotional features for our gaming platforms, where performance, scalability, and cutting-edge solutions are paramount.

If you’re a product-passionate person, your mind is keen to solve deep tech engineering problems, and you have a fast “PoC first” approach with a deep sense of ownership, we would love to hear from you.

Main Responsibilities

– Develop and maintain robust backend systems for our promotional features

– Optimize existing systems for enhanced performance and scalability

– Lead technical decisions and contribute to our SaaS solutions

– Collaborate with distributed teams to innovate and implement new features

– Ensure code and architectural excellence through reviews

– Address complex technical challenges with innovative solutions

– Participating in on-call rotations within the squad to help ensure the reliability and availability of our systems

Mandatory Requirements

– Strong proficiency in Node.js and TypeScript (our primary backend stack). We’re also open to strong backend engineers from other ecosystems (e.g., Go, Java, Python, C#, C++) who are ready to ramp up quickly

– Strong understanding of asynchronous programming and concurrency patterns

– Experience building distributed systems and working with messaging and coordination tools (e.g., Kafka, RabbitMQ, NATS, distributed locks)

– Experience with gRPC in production environments

– Solid knowledge of databases: relational (MySQL, PostgreSQL), columnar (ClickHouse), and NoSQL (DynamoDB, MongoDB)

– Experience with cloud platforms (AWS/GCP/Azure) and Kubernetes

– Skilled in building and maintaining unit and end-to-end tests

– Proven track record of delivering production-ready solutions

– Experience working with large-scale microservices architectures

– Degree in Computer Science or a related field (or equivalent practical experience)

Nice to Have

– Understanding of enterprise development patterns

– Experienced with large-scale microservices architecture

– Experience with cloud providers (AWS, GCP, etc.)

– Active performance observation

– Gambling domain experience

– Understanding of application security and industry standards, its best practice

We offer

– Competitive Salary

– Quarterly Bonuses

– Unlimited Paid Time Off

– Unlimited Paid Sick Leave

– Remote & Flexible Working

– Private Medical Insurance

– Financial Support for Life Events

– Professional Development Budget

– International Exposure

– Regular Company Events

*Benefits may vary depending on location and contractual agreement

We are looking for an experienced Senior Full Stack Engineer with strong Node.js and TypeScript expertise to take ownership of production applications and build scalable web solutions across backend, frontend, database, and cloud environments.

Responsibilities

• Design and develop scalable web applications and backend services using Node.js and TypeScript
• Build REST or GraphQL APIs with NestJS or similar frameworks
• Develop modern frontend applications using React or Next.js
• Design and optimize PostgreSQL database models and queries
• Integrate third-party services and enterprise systems
• Implement automated testing and CI/CD pipelines
• Participate in architecture and technical-planning discussions

• Take ownership of development tasks and delivery

   

Requirements

• 5+ years of professional software-development experience
• Strong commercial experience with Node.js and TypeScript
• Experience with NestJS or similar backend frameworks
• Strong knowledge of PostgreSQL, SQL, and relational database design
• Strong experience with React, Next.js, or similar frontend frameworks
• Experience with Docker, cloud deployment, and CI/CD
• Strong understanding of REST APIs and modern web application architecture
• Ability to work independently and take ownership of delivery

• Professional English

   

Nice to have

• AWS or Azure
• Kubernetes and Terraform
• Kafka, RabbitMQ, or other event-driven technologies
• Microservices and enterprise integrations
• GraphQL
• AI/LLM integration experience
• Experience in FinTech, banking, insurance, healthcare, or other regulated domains

This is an application to join CML Team. Selected engineers will be contacted when a suitable project matches their experience, availability, location, and rate.

To apply: Please include your CV, current location, availability, preferred contract type, and expected hourly or daily rate.

Overview 

Come join us as we scale our retail and commerce loyalty platform! PAR Retail is looking for a Senior NodeJS engineer on its expanding product engineering team as we build and grow our Open Commerce enterprise software-as-a-service platform. 

Open Commerce is a technology suite that enables marketing professionals in the fuel & convenience industry to create real-time, hyper-personalized offers and customer interactions across a variety of channels (mobile, web, SMS, and in-person) to drive customer behavior toward a desired goal. 

Our technology bridges financial payment providers, retail fuel pump technology, and customer experience by wrapping low-level standards-compliant integrations with powerful software abstractions on an ultra-modern software platform. Our platform services and applications are built using a broad swath of technologies (Typescript, NodeJS, Ruby, React, and others), interconnected via GraphQL and RabbitMQ, and run in AWS using Terraform, Helm and Kubernetes (via EKS). 

PAR Retail has its headquarters in Philadelphia, Pennsylvania (USA) and leverages a diverse distributed product engineering and operations team across the United States and Ukraine. PAR Retail offers highly competitive compensation and benefits, as well as an engineering-friendly and product-centric culture. On PAR Retail’s Open Commerce team, we embrace a deeply collaborative software product development process where engineering, design, and product collaborate to shape and ship new functionality. 

Successful candidates will enjoy PAR Retail’s friendly and flexible culture, and embrace our relentless drive to excellence and goal of providing the #1 retail marketing platform in the fuel & convenience industry and beyond. 

Responsibilities 

• Working with the team, design and implement new functionality based on product objectives and requirements. 
• Work with the broader product engineering team to plan and coordinate feature and functionality improvements, as well as resolve bugs and execute technical enhancements, that cross-cut large parts of our platform. 
• Work to continually learn, improve technology skills, expand knowledge of the Open Commerce platform technologies, and gain increasing versatility across the breadth of our platform systems. 
• Expand APIs and business logic, and as needed write or revise customer-facing API documentation. 
• Work with our infrastructure team to enable and enhance highly-available, performant, and well-instrumented backend applications and services that run in our customer environments at substantial scale. 

• Support operations and infrastructure teams for issue resolution on relevant Open Commerce applications or services running in production environments. 

   

Qualifications 

• Practical experience building systems in Node.js 
• At least 5 years industry experience or equivalent 
• Experience building and maintaining backend APIs, including design, implementation, evolution, and maintenance 
• Familiarity with TypeScript, or similar modern strongly-typed language 
• Proficiency using both relational and non-relational database technologies 
• Strong understanding and familiarity with CI/CD pipelines and automated testing 
• Basic knowledge Docker and Kubernetes 
• Familiarity with OAuth and JWT 
• Some experience with front-end JS technologies, esp. React or Angular 
• An ability to work in service-based architectures 
• Highly independent and able to effectively self-organize and prioritize work 
• The ability to write clean code, and the discipline to write effective automated unit tests in order to deliver high-quality system improvements 
• An ability to effectively break down larger bodies of work for delivery as a series of small, self-contained changes to the system 
• Excellent spoken and written communication skills 

• BS/MS degree in Computer Science, Engineering, or equivalent years of professional working experience 

   

Bonus Points 

• Experience with Nest.js and/or GraphQL 
• Experience with Ruby on Rails 
• Experience with AWS 
• Experience working in distributed teams 

• Experience in the retail and/or fuel & convenience industries 

   

PAR Retail Offers:

- Long-term employment;

- Competitive compensation with regular performance-based salary and career development reviews;

- Paid vacations and sick leaves;

- Flexible working hours;

- A unique and friendly environment where everyone can explore and learn new technologies.

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).

Meet the YozmaTech

YozmaTech isn’t just another tech company – we’re a global team of go-getters, innovators, and A-players helping startups and product companies scale smarter and faster.
We build dedicated development teams across 10+ countries, creating strong, long-term partnerships based on trust, transparency, and real impact.
Here, every idea counts. We value people who are proactive, open-minded, and ready to grow. If you’re passionate about building meaningful products and want to join a team that feels like family – you’ll feel right at home with us.

Our client is a fast-growing startup focused on modernizing the way companies manage procurement and purchasing. They help organizations streamline procurement workflows, vendor management, and internal processes, allowing them to move faster, control spending, and gain better visibility. The company is small, fast-moving, and highly customer-focused. They work closely with their customers and move quickly from feedback to product improvements. Their platform is highly configurable and integrates with systems such as ERPs, CLMs, and collaboration tools.

Key Requirements:
🔹 You have solid 10+ years of experience building and operating production backend systems;
🔹 You are strong at debugging and refactoring across services, logs, and data and strive for;
🔹 Precise understanding, not hand wavy guesses;
🔹 AWS, with a heavy use of managed and serverless services;
🔹 TypeScript and Node for backend services;
🔹 Aurora Postgres;
🔹 Python for some services and data related work;
🔹 Integrations with third party APIs, ERPs, CLMs, and collaboration tools;
🔹 And flows rather than only individual endpoints;
🔹 You have taken ownership of technically challenging and evolving projects before and are;
🔹 Comfortable working through ambiguity;
🔹 You communicate clearly in writing and in conversation and are comfortable pushing back;
🔹 Asking questions, and exposing risks early;
🔹 You are good at using documentation, experimentation, and AI tools to unblock yourself and;
🔹 Accelerate your work, while still owning correctness and quality;
🔹 You care about leaving codebases and systems in a better state than you found them and;
🔹 Think about maintainability by default;
🔹 Priori experience working at a US based company is a nice to have;
🔹 English – Upper-Intermediate or higher.

Will be plus:
🔹 You can clearly communicate and debate complex problems and proposed solutions;
🔹 You have a broad engineering mindset and enjoy understanding systems end to end;
🔹 You are comfortable taking ownership of technically challenging, evolving projects, not just;
🔹 Well scoped tickets;
🔹 It is very important to us that you are independent: you know how to ask questions, ask for;
🔹 Help, and own your features start to finish;

What you will do:
🔹 Own features end to end and drive them from discovery through design, implementation;
🔹 Rollout, and follow up;
🔹 Work independently while collaborating smartly by unblocking yourself and asking questions;
🔹 Analyze and decompose complex work into clear, incremental steps without losing important;
🔹 Edge cases;
🔹 Communicate and debate solutions by explaining complex topics simply and leading;
🔹 Productive design discussions;
🔹 Identify and articulate tradeoffs across performance, reliability, complexity, and delivery;
🔹 Speed to guide decisions;
🔹 Design and implement backend services including APIs, background jobs, and data flows;
🔹 Across multiple domains and systems;

Interview stages:
🔹 1. Technical Interview(s) with Team Engineers;
🔹 2. Non-Technical Interview with the CTO;


Availability & Collaboration Hours

To ensure seamless collaboration across time zones, everyone is expected to be available for meetings and collaborative work for 4 hours each day, from 10:00 AM to 2:00 PM Eastern Time (ET). This is a mandatory shared availability window for all team members, regardless of their location.

Is game engine logic and RTP calculation your superpower? There’s a chance to join a fresh team at a leading iGaming company as a Senior Software Engineer. TOP conditions await: above-market salary, quarterly bonuses, unlimited PTO, and a stable home for years to come!

This role sits at the intersection of engineering, game mathematics, platform, and compliance. You’ll work on the tools, frameworks, and services that enable our mathematicians and game teams to build, validate, run, and monitor game logic in production.

This position is about deep ownership of a very specific technical domain: game engines, mathematical packages, simulation data, RTP monitoring, round details, and integrations with games developed both internally and by external studios.

You’ll be part of a small, experienced team with a high level of responsibility. The impact of this work is direct: incorrect game logic, missing round details, or inaccurate RTP monitoring can affect game delivery timelines, business performance, and regulatory readiness.

If you enjoy working close to complex domain logic, reviewing technical implementations, understanding how games work under the hood, and owning systems where precision matters – this role will feel like home.

Main Responsibilities

– Own, maintain, and evolve company’s Game Engine domain

– Work on internal frameworks and libraries used by mathematicians to implement game logic and mathematical packages

– Review and validate code written by mathematicians, ensuring quality, correctness, maintainability, and proper usage of internal frameworks

– Contribute to the development and support of game engines used to run mathematical logic within our platform

– Support integrations with external game studios by helping build wrappers and bridges between third-party game implementations and Playson’s platform

– Work with data structures and protocols that connect game logic with frontend and backend systems

– Contribute to RTP monitoring processes, including validation of production transaction data against simulation data and expected mathematical behaviour

– Support and evolve tools used for mathematical review, simulations, data files, monitoring, and alerting

– Implement and maintain round details logic required for regulated markets, ensuring that detailed game round information can be correctly provided to partners and regulators

– Collaborate closely with mathematicians, backend engineers, platform teams, compliance stakeholders, and product representatives

– Participate in code reviews and technical discussions to ensure a high engineering standard across the Game Engine domain

– Investigate issues related to game logic, mathematical validation, monitoring, and engine behaviour

– Participate in minimal on-call responsibilities related to the systems owned by the team, mainly around monitoring, alerts, and domain-specific incidents

– Take ownership of a highly specialised area where quality, accuracy, and attention to detail are essential

Mandatory Requirements

– Strong software engineering experience, ideally in backend, game engine, gaming, gambling, betting, or simulation-heavy environments

– Solid experience with Node.js/TypeScript, or strong expertise in another OOP language such as C++, Java, C#, Go, or Python

– Good understanding of software architecture, code quality, testing, debugging, and maintainability

– Experience reviewing complex code and providing clear technical feedback

– Ability to understand domain-specific logic and work with technical systems where business rules, mathematics, and engineering are closely connected

– Strong problem-solving skills and ability to work with complex, non-standard technical challenges

– Experience working with production systems where reliability, accuracy, and correctness are critical

– Understanding of backend systems, APIs, data flows, and service-to-service communication

– Ability to collaborate closely with non-engineering technical experts, especially mathematicians or domain specialists

– Strong ownership mindset and willingness to become a key expert in a narrow but highly important technical domain

– Product-oriented thinking, with an understanding that games are the core product and engineering decisions directly affect delivery, quality, and compliance

– English communication skills sufficient for working in an international environment

Nice to Have

– Experience in iGaming, gambling, betting, game development, or casino games

– Experience working with game engines, mathematical engines, simulation tools, or game logic frameworks

– Background in C++ or experience working with legacy C++ systems

– Experience with mathematical models, probability-based systems, simulations, random generators, or RTP-related logic

– Understanding of regulated markets and compliance requirements in iGaming

– Experience with ClickHouse or other analytical/columnar databases

– Experience with monitoring, alerting, and production diagnostics

– Experience with AI-assisted code review or automated validation tools

– Knowledge of microservices architecture and distributed systems

– Familiarity with Kafka, gRPC, Kubernetes, or AWS

– Experience integrating third-party games, external studio products, or wrapper-based solutions

– Ukrainian language skills would be a plus

We offer

– Competitive Salary

– Quarterly Bonuses

– Unlimited Paid Time Off

– Unlimited Paid Sick Leave

– Remote & Flexible Working

– Private Medical Insurance

– Financial Support for Life Events

– Professional Development Budget

– International Exposure

– Regular Company Events

*Benefits may vary depending on location and contractual agreement

Recruitment Process

– HR interview

– Technical interview (with Live coding)

– Final interview

This role is more focused on backend development with Node.js and TypeScript, but it also requires React experience so you can handle your frontend tasks independently rather than relying on a frontend developer.

Infrastructure and production environments are handled by a separate DevOps team, so your focus will remain on application development rather than production support or infrastructure management.

Responsibilities

1. Design, develop, and maintain backend services throughout the full development lifecycle
2. Assist with frontend implementation when needed to deliver product features
3. Release new functionality and monitor feature stability after deployment
4. Work closely with Product, Platform, and Reliability teams
5. Contribute to technical improvements and enhancements within the existing architecture

Tech Stack

Node.js, TypeScript, React, Redis, MySQL, PostgreSQL, Elasticsearch, Kafka/RabbitMQ, monitoring and observability tools

Requirements

• Strong hands-on commercial experience with Node.js and TypeScript
• Experience with React and modern frontend engineering practices
• Solid experience with databases, caching, and data management approaches
• Experience investigating and resolving issues in distributed environments
• A product ownership mindset, with the ability to take features from concept to production
• English communication skills for daily collaboration and team meetings

Nice to Have

Experience with microservice architectures and API development

Experience with Docker and Kubernetes

Knowledge of application performance tuning and optimization

Basic understanding of Linux and networking

Familiarity with clean architecture principles and testing methodologies

What the Company Offers

• Fully remote work environment with a flexible schedule
• Paid vacation and days off
• Salary reviews twice a year
• B2B/contractor cooperation model with accounting support
• An opportunity to work on a large-scale product and influence technical direction