Jobs

Requirements:

5+ or more years experience in Node.js;

Experience with Node.js, JavaScript ES6 and related tools (npm, yarn, webpack, etc);

Experience with back end data / API integration using JSON and RESTful web services;

Experience working with WebSockets;

Experience in PostgreSQL/ MySQL;

Development architecture BD;

An open-minded person, a proactive team player, delivering in time.

Will be a plus:

Understanding of the working principles with Docker/Docker compose;

Responsibilities:

Work on the back-end development for the digital solutions;

Develop backend for a new web platform from scratch;

Implement new services/features as a backend developer;

Contribute to all phases of software development lifecycle;

Follow industry best practices;

Be a part of backend development team that is responsible for all aspects of ongoing software.

We offer:

Flexible schedule and possibility to work entirely remotely;

Opportunities for professional development and personal growth;

Corporate events, holiday celebrations, team building activities;

Paid annual and sick leave;

Close work with top management and ability to be a decision-maker;

The ability to attend conferences, webinars, and other events that will enhance your professional skills;

People-oriented management without bureaucracy.

Become part of United Tech as an experienced Node.js Backend Developer, contributing to high-performance, scalable products using modern technologies

About the team: join our Backend team, where collaboration and growth are at the heart of everything we do. We are a close-knit group of developers, Product Managers, DevOps, and QA specialists, all dedicated to helping our products thrive. With mentorship from seasoned experts and a strong sense of ownership, everyone here has a voice and can make a real impact.

Working in the social networking niche, we embrace challenges and celebrate progress. This is a dynamic field where you will stay on top of trends, tackle high-load systems, and dive into complex problems. The market is still growing, and there’s plenty of opportunity to carve out your own path and make a difference!
 

Know someone perfect for this role? Recommend a candidate and receive a bonus up to $1500
 

In this role, you will:
 

• Participate in team processes (grooming, sprint planning)
• Develop and deliver product tasks to the production environment
• Handle technical debt tasks
• Create technical designs for product epics
• Decompose epics into actionable tasks
• Investigate and resolve complex issues

It’s all about you:
 

• 4+ years of commercial backend development experience
• 3+ years of Node.js backend experience
• Proficiency with relational and non-relational databases (Postgres, MongoDB, Redis)
• Experience with SOA/Microservices architecture (communication, patterns, development process)
• Knowledge of WebSockets and messaging systems (RabbitMQ, Kafka)
• AWS experience (S3, Aurora, Cloudfront)
• Experience with scaling and high-load systems
• Strong Computer Science fundamentals
• Intermediate English level or higher

What we offer
 

• Care and support: 
• 20 paid vacation days, 15 sick days, and 6 additional days off for family events
• 100% medical insurance coverage
• Sports and equipment reimbursement
• Online yoga class with an instructor from the Ukrainian Yoga Federation
• Team building events, corporate gifts, and stylish merch
• Financial and legal support
• Position retention and support for those who join the Armed Forces of Ukraine
• Participation in social initiatives supporting Ukraine
   
• Comfortable working environment:
• Work from our Kyiv hub or remotely with a flexible schedule 
• Modern equipment or depreciation of your own tools
   
• Investment in your future:
• Collaborate with a highly-skilled team of Middle & Senior professionals, sharing practical cases and expertise in the social networking niche
• 70% of our heads and leads have grown into their roles here – so can you!
• Performance-oriented reviews and Individual Development Plans (IDPs)
• Reimbursement for professional courses and English classes
• Corporate library, book club, and knowledge-sharing events
  
  
   

Hiring process:

• Intro call
• Tech Interview
• Final Interview 
• Reference check
• Offer
   

Qualifications: 

-Strong proficiency in Node.js and TypeScript

-Experience developing and maintaining streaming services (implementing and optimizing APIs for audio content delivery, integrating with CDNs and ad insertion systems)

-Solid understanding of microservice architecture

-Confident experience with PostgreSQL (query optimization, replication handling)

-Experience deploying and maintaining services on Heroku

-Experience with AWS (CloudFront, S3, Load Balancer, IAM, monitoring and logging)

We offer:

• Attractive financial package

• Challenging projects

• Professional & career growth

• Great atmosphere in a friendly small team

Hey there! 👋

Are you an expert engineer with experience in leading engineering teams and building scalable software on Node.js? Then we're looking for you. You'd be working with a team of a well-funded Silicon Valley-based tech startup, on a digital product for healthcare professionals in the United States.

What skills we expect you to have: 🎯

• English: Advanced (C1+)
• You studied well and got a B.Sc. in Computer Science;
• Excellent communication, collaboration, problem-solving, and analytical skills;
• 5+ years of writing commercial Node.js apps;
• Typescript is almost your mother tongue;
• You write your TODO lists via direct SQL queries;
• Extensive experience with Amazon Web Services;
• Understanding of LLMs and their application to building web applications;

What would be a huge plus: ✨

• You have built CI/CD pipelines (even though pushing code straight to prod is fun);
• You have experience building AI apps (LangChain / LlamaIndex) and with MLOps;

What’s in it for you: 🌴

Professional Growth & Lifestyle:

- Remote work (our team is 100% remote);

- Access & support for obtaining AWS certifications;

- Opportunity to join an international team of a fast-scaling startup;

- Leadership initiatives.

Benefits:

- Annual vacation: 20 business days (100% compensation)

- Annual sick leave: 10 business days (100% compensation)

- Competitive compensation.

Please, feel free to reach out should you have any questions!

Best regards,

Universium Team ❤️

P.S. No GPTs were hurt (or used) in production of this job posting.

Our client - Finaloop - reshapes bookkeeping to fit the e-comm needs: with Finaloop, customers get flawless financials and actionable real-time data that can keep up with their brand.

About the Role: 

Are you passionate about building and optimizing the core infrastructure of large-scale server applications that power real-world, user-facing products? As part of the team, you’ll play a key role in defining and implementing the infrastructure that drives our innovative product.

We are looking for experienced developers to join its core architecture and platform group. The architecture group researches, designs, and implements the building blocks upon which the product is built and executed. This includes among many other things, the application infrastructure for our different services and our data ingestion architecture.

Key Responsibilities: 

• The most fundamental components of our system, whether it is the cloud infrastructure or the different common software solutions used by developers
• Developing system-wide solutions to be used by the product development teams
• Developing scalable long-term solutions
• Detecting opportunities to improve R&D efficiency and the reliability of our systems by improving and expanding the common infrastructure of our product
• Researching new technologies and solutions with the potential to be incorporated into our product
   

Required Competence and Skills:

• 6+ years of experience in server-side development and distributed systems
• Excellent knowledge of software and application design and architecture
• Experience with different backend architectures and approaches
• Experience in working with different types of data storage technologies and approaches (e.g. OLAP, OLTP, relational, document, etc.)
• Proven track record of working efficiently in a fast-paced intensive startup environment
• Strong communication and collaboration skills
• Building high-volume data pipelines - an advantage
• Client-side web development experience - an advantage

The main components of our current technology stack:

• Our cloud provider is AWS
• We develop mainly in Typescript and in some cases use Python
• We use Nodejs in the backend
• Our systems run on Kubernetes (EKS) and as lambda function
• Our 2 main databases are: Postgres and Snowflake
   
• Why Us?
• We utilise a remote working model, providing a powerful workstation and co-working space of your choice in case you need it 
• We offer a highly competitive package  
• We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in)
• We prioritize the professional growth and well-being of our team members. Hence, we organize various social events throughout the year to foster connections and promote wellness

At Enjoy Gaming, we’re a passionate team of industry experts, backed by market specialists and foreign investment. We’re thrilled to create live dealer shows and slots. We’re making our games to provide an even better gaming experience.
Our core values of ownership, communication, and honesty drive everything we do.
Join us and be part of our innovative journey in the gaming world!
We are currently seeking a Senior  Node.js Developer. You will collaborate closely with Product Owner, and other developers to transform complex requirements. You will also have the opportunity to mentor junior developers and contribute to the architectural decisions that shape our projects.
 

About you:
— 6+ years experience with backend in NodeJS/Express.
— Strong Knowledge of Nest JS / Typescript.
— Strong Knowledge of  SQL and NoSQL.
— Experience WebSockets and REST API.
— Experience using messaging and task-processing frameworks (e.g., BullMQ, RabbitMQ, etc.)
— Understanding of security, vulnerabilities, and approaches to avoid them.

— English level intermediate or higher.

Will be a plus:
— Experience in optimizing the performance of highly loaded systems
— Good understanding of GCP
— Experience with JavaScript, React.js
— Working principles with Docker/Docker compose

 

Responsibilities:
— Writing high-quality code
— Documentation: Create and maintain code and architecture documentation
— Collaborating with teams: Working closely with other developers, QA, designers, Product Owner, to ensure the successful delivery of projects
— Keeping an eye on security
— Participate in planning
— Solving complex problems
 

What you get in return:
— Competitive Salary: Competitive salary fixed in EUR with yearly performance reviews
— Tax Coverage: The company provides tax coverage
— Remote Work Option: Choose to work remotely, providing greater flexibility and comfort
— Corporate Benefits: Medical insurance, psychologist, English-speaking club
— Paid Vacation: 20 working days of paid vacation + 10 time off in lieu , including national holidays
— Paid Sick Leave: 10 working days
— Professional Development: Get reimbursement for professional development courses and training
— Self-Development: Get reimbursement for language courses, sports, massage, or life coach

We are looking for a skilled Senior Node.js Developer with relocation to Cyprus or Poland.

✅ Requirements:

✔️Strong knowledge of JavaScript and the ECMAScript 6 standards

✔️3+ years of commercial experience with Node.js

✔️5+ years of commercial experience in web development

✔️Commercial experience working with high-loaded SQL or NO SQL databases

✔️Commercial experience in implementing the REST, GraphQL, and WebSockets

✔️Understanding of the TDD principles and experience in writing tests

✔️Understanding of microservice architecture principles

✔️Experience with GIT version control system

✔️Experience with RabbitMQ

✔️Experience with Redis

✔️Experience with databases MongoDB, MySQL

✔️At least an Intermediate lvl of English

✅ Will be a plus:

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

✔️Experience with Kubernetes,

✔️Experience with Nats

✔️Experience with TypeScript

✅ Duties and opportunities:

✔️In-house platform development

✔️3rd party API integrations

✔️Actively participate in developing new features from scratch

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

✔️Working with the latest technologies (Nest, Kubernetes, mongo, graphQL, MySQL, etc)

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

📝Official employment in accordance with the laws of Cyprus and the EU, registration of family members;

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

🏋️‍♂️ Company fitness corner in the office for employees;

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

🎁 Birthday celebration present;

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

🍲 Breakfasts and lunches in the office (partially paid by the company).

The international software development and digital solutions company driven by 1,300 talented professionalsl.
Here, everything moves at rocket speed: driving innovation, pioneering projects, and fast-tracking careers.
Together, we turn ideas into action—let’s get started!

We are looking for a skilled Senior Node.js Developer 

Requirements:
- Strong knowledge of JavaScript and the ECMAScript 6 standards
- 3+ years of commercial experience with Node.js and Nest.js
- 5+ years of commercial experience in web development
- Commercial experience of working with high loaded SQL or NO SQL databases
- Commercial experience of implementing the REST, GraphQL and WebSockets
- Understanding of the TDD principles and experience of writing tests
- Understanding of microservice architecture principles
- Experience of GIT version control system
- Experience with RabbitMQ
- Experience with Redis
- Experience with databases MongoDB, MySQL
- At least Intermediate lvl of English

Will be a plus: 
- 2+ years of hands-on experience developing over CI/CD/Micro Services architecture/Containers
- Experience with Kubernetes
- Experience with Nats
- Experience with TypeScript

 Duties and opportunities:

- In-house platform development
- 3rd party API integrations
- Actively participate in developing new features from scratch

 We offer excellent benefits, including but not limited to:

 - Snacks in the Office 
- Attractive office location and facilities
- Medical insurance
- Breakfasts and lunches in the office (partially paid by the Company)
- Languages classes (partially paid by the Company)
- Social Club of the Company

Description

We are looking for Full-stack developers JS, Part-time (with potential for full-time) a passionate, innovative, results-oriented specialist with a heart-deep commitment to success to join our company.

Responsibilities:
 

• Build and deploy automated, cutting-edge software solutions;
• Design and develop software tailored to business needs;
• Collaborate with cross-functional teams to gather and analyze requirements;
• Improve software performance, scalability, and reliability;
• Write clean, efficient, and maintainable code;
• Design and develop a software application;
• Analyze requirements and collaborate with team members to produce thoughtful software designs.
• Provide accurate estimates on work items.
• Participate in code review;

Requirements:
 

• Experience with React, TypeScript, Next.js, Node.js/NestJS;
• Deep understanding of the technology stack and software development processes;
• Familiarity with building and consuming RESTful APIs;
• Proficiency in database technologies such as PostgreSQL;
• Strong problem-solving and debugging skills;

[REMOTE OPP] Have you ever been part of a hyper-growth startup?

We're a growing e-commerce startup with a popular SaaS product, and we're on the lookout for skilled backend developers who know their way around Nest.js. This is a full-time fully-remote position for experienced engineers.

IMPORTANT: Please only apply if you reside in Europe, GMT to GMT+3.

In this role, you’ll be working on the heart of our product:

• Build new features for our core platform that handles product recommendations, pricing, discounts, business rule engine, and product subscriptions
• Design and develop tools focused on boosting merchant revenue
• Get involved in shaping our cloud architecture on AWS
• Build powerful integrations with Shopify API and other e-commerce platforms
• Fine-tune the performance of our API under heavy load
• Improve our devops pipeline for smooth continuous delivery

Requirements

• 5 years or more of software engineering experience
• 2 years or more with AWS or GKE
• 1 year or more building web applications with Nest.js
• 1 year or more employed fully remotely by international companies

Bonus points - if you have experience with

• Developing apps for Shopify, familiar with the platform concepts and API
• Deploying microservices on Amazon ECS or Google GKE
• Using generative AI every day for effective development
• Digital nomads are welcome!

What You Get

Get the chance to work in a fully-remote, global startup during its most exciting early days. You'll help shape a rapidly growing product with millions of users. Dive deep into the Shopify ecosystem and learn all about the e-commerce world. Be part of a team that practices continuous delivery to live production.

Stack

All new microservices are written using Nest.js and Prisma ORM, with PostgreSQL.

Our servers run on AWS ECS and on Heroku.

Asynchronous task are orchestrated with Temporal.io.

Our lightweight agile process and technical knowledge are managed in Notion.

We use GitHub, Sentry.io, SemaphoreCI, New Relic.

About Us

Amplify (formerly PickyStory) helps e-commerce merchants manage and optimize sales using powerful strategies such as cross-selling, upselling, product bundles and subscriptions.

Our product is live and growing fast. We're actively developing the core platform, adding new features, and updating our cloud infrastructure. If you join us, expect to make software design decisions, craft new components from scratch, and refactor existing code to perfection.

We're a fully remote global team. We speak English, Ukrainian, Russian, and Hebrew. The engineering team is centered in Europe.

About the Product

You’ll be working on a wellness tech platform built around smart scale hardware using BIA technology to provide users with precise data on body composition — fat %, lean mass, hydration, and more. The platform combines hardware innovation with a seamless digital health experience.
 

Tech Stack

• Node.js (primary language)
• Google Cloud Platform: Firestore, Cloud Functions, App Engine, OAuth/JWT
• RESTful APIs
• Swagger/OpenAPI
• Redis
• Python (nice to have)
   

Team Composition

• 4 Mobile Engineers
• 1 Full-Stack Engineer
• 2 QA Engineers
• 1 Designer
   

Stage

Live product, actively evolving
 

Requirements

• 5+ years of experience building production-level backend systems
• Strong expertise in Node.js
• Hands-on experience with Google Cloud Platform (or at least one major cloud provider)
• Deep understanding of REST API design, versioning, security, and documentation
• Experience with OAuth/JWT, error handling, and caching
• Solid debugging and testing skills
• Fluent communication in English (daily contact with US-based team)
   

Nice to Have

• Basic experience with Python
• Experience working with Firestore and Cloud Storage
• Background in healthcare or working with sensitive data
• Familiarity with OpenAPI/Swagger
• Integrations with AI/ML services (e.g., Claude AI)
   

Responsibilities

• Develop and maintain scalable, secure REST APIs
• Build endpoints for client management, medical data processing, and clinical dashboards
• Integrate backend with hardware (BIA smart scale) and AI-based recommendation systems
• Optimize performance for large-scale healthcare data
• Ensure high API reliability, error handling, logging, and security (HIPAA compliance)
• Collaborate closely with mobile engineers, designers, and QA team

About the job

As a Senior Back-end Engineer, you will contribute to the development of our cutting-edge Gambling and Casino Platform, architecting secure, scalable services that ensure real-time transaction processing, high traffic reliability, and seamless third-party integrations. Your focus will be on optimizing performance, enforcing compliance, and building resilient APIs and algorithms to power critical features like odds calculation, payments, and user authentication.

Collaborating with cross-functional teams, you will drive the platform’s technical backbone, ensuring uptime and efficiency for global users. Your work will set industry standards through innovative back-end solutions, rigorous testing, and a commitment to maintaining mission-critical system integrity.

Responsibilities:

• Design, develop, and maintain backend services for our Gambling and Casino platform.
• Optimize and scale PostgreSQL databases for high performance and reliability.
• Collaborate with the engineering team and other stakeholders to deliver seamless integrations and new features.
• Write clean, maintainable, and well-documented code following best practices.
• Troubleshoot and debug issues, ensuring the stability and performance of the system.
• Participate in code reviews and contribute to ongoing technical growth and improvement.
• Stay up-to-date with industry trends and technologies to continuously improve our product.
  
   

Requirements & Skills
Experience

• 5+ years of experience in software development with JavaScript/TypeScript and Node.js, preferably for complex high-load web applications in iGaming or Fintech domains.
  
   

Technical Skills

• Proficiency in JavaScript/TypeScript.
• Expertise in Node.js, Nest.js, TypeORM, PostgreSQL, and Redis.
• Understanding of SQL and NoSQL database architecture, optimization, and management.
• Experience with real-time communication technologies (e.g., WebSockets).
• Experience writing and executing tests, including unit, integration, and failure tests.
• Understanding of RESTful APIs, microservices architecture, and event-driven systems.
• Knowledge of Docker, Kubernetes, and the concepts and benefits of CI/CD processes.
• Understanding of SOLID, GRASP, CQRS principles, GoF design patterns, and DDD concepts.
• Knowledge of Event Sourcing, including events, aggregates, projections, and event streams.
• Knowledge of traditional monolithic architectures, microservices architecture, and hexagonal architecture's emphasis on separation of concerns.
• Understanding and practice of Agile development methodology and its Scrum and Kanban frameworks.
  
   

Our recruitment process typically follows these stages: 

• Application screening
• Interview Stages (2-3 weeks):
• Job Offer
• Referrals: Employment and Background Check

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;

- Health insurance program;

- Flexible working hours;

- Sponsored company educational program, corporate library;

- Comfortable and cozy office;

- Funny celebrations, team outings, and company events;

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

We are looking for a highly skilled Senior Full-Stack Engineer with deep experience in Node.js and React, and a solid background in .NET. The ideal candidate combines strong technical capabilities with a pragmatic approach to software design and delivery, a good understanding of system architecture, and the ability to communicate effectively with both technical and non-technical stakeholders. Experience or interest in AI tools and modern ML-based solutions is a strong plus.

Essential Job Duties

• Lead and participate in the full software development lifecycle: planning, designing, developing, testing, and maintaining scalable web applications.
• Develop and maintain backend services using Node.js, with occasional work on .NET-based components.
• Design and build modern SPAs using React and TypeScript with a focus on reusability and performance.
• Collaborate cross-functionally with designers, product managers, and other engineers to deliver high-impact features.
• Participate in architectural decisions, code reviews, and mentorship of mid- and junior-level developers.
• Build and integrate scalable APIs and third-party services (e.g., Stripe, OpenAPI-based clients).
• Ensure the codebase adheres to best practices including SOLID principles, clean code, and scalable architecture.
• Participate in agile development processes, including sprint planning, retrospectives, and standups.
• Troubleshoot complex issues across the stack, from the browser to backend services and infrastructure.
• Contribute to infrastructure decisions including CI/CD, containerization, and deployment in AWS/Kubernetes environments.
• Experience in end-to-end feature life cycle ownership from product requirements to architecture and design to development and testing.
• Optionally support or experiment with integrating AI-based tools into engineering workflows or product functionality.

Required Skills & Experience:

• 8+ years of professional software development experience, with a primary focus on back-end engineering and solid full-stack capability.

Back-end:

• 5+ years of experience building scalable backend systems using Node.js and TypeScript, with frameworks like Express.js or NestJS.
• 2+ years of hands-on experience with .NET (C#), preferably developing APIs or enterprise integrations using .NET Core or EF Core.
• Proficiency in designing and developing RESTful or gRPC services, with a solid grasp of microservice patterns and distributed architectures.
• Deep experience with SQL databases (e.g., PostgreSQL, MySQL) and NoSQL systems (e.g., MongoDB, Redis).
• Working knowledge of AWS services (e.g., EC2, RDS, Lambda, S3) and container orchestration with Docker and Kubernetes.
• Familiarity with CI/CD pipelines, monitoring tools, and debugging techniques for high-scale production systems.
• Strong understanding of back-end fundamentals: networking, performance, observability, and security best practices.

Front-end:
 

• 3+ years of experience building and maintaining React applications with TypeScript.
• Proficient in core web technologies: HTML, CSS, and modern JavaScript.
• Familiarity with state management (e.g., react-query, Redux) and UI performance best practices.
• Experience designing reusable UI components and working with component libraries or custom design systems.
• Comfortable with front-end and back-end integration patterns and API-driven development.

Desirable Skills & Experience:

• Experience integrating payment systems, like Stripe or other payment processing platforms.
• Exposure to OpenAPI/Swagger for client/server code generation.
• Experience in .NET Core APIs or transitioning between monolith and microservices architectures.
• Familiarity with AI/ML concepts, tools, and frameworks (e.g., LangChain, Hugging Face, OpenAI API).
• Prior work on eCommerce, enterprise, or data-intensive applications.
• Experience with event-driven systems (e.g., RabbitMQ, Kafka).
• Familiarity with GraphQL or other modern API paradigms.

Who you are:

• Excellent communication skills – able to translate technical solutions to non-technical stakeholders.
• Strong collaboration and mentoring mindset – enjoys working with others and sharing knowledge.
• Curious and proactive learner, especially around new tech and architectural patterns.
• Pragmatic problem-solver who prioritizes delivery and business impact over technical complexity.
• Comfortable working in remote/distributed teams and agile environments.
• English proficiency: Upper-Intermediate (B2+) or higher across all four skills.

Working Arrangement: European time zone, 40-hour work week, engaged via a contractor's agreement.

About the Role
 

We’re building an in-house batch payout and reconciliation platform for ERC-20 and TRC-20 tokens. You’ll own the end-to-end architecture - from hot-wallet key management and bulk on-chain transfers to monthly SLA reporting - supporting up to 10,000 concurrent transactions.

Key Responsibilities:

- Architect and build a high-throughput batch payout engine in Node.js, handling ERC-20 & TRC-20 token transfers

- Integrate with self-custodied hot wallets; securely manage private keys (AWS KMS, HashiCorp Vault, HSM, etc.)

- Implement nonce management, gas optimization (EIP-1559), and on-chain batch-transfer contracts

- Develop reconciliation logic using both on-chain data and off-chain data from CEXs/DEXs and Oracles

- Design retry strategies, error handling, and idempotent workflows for failed or reverted transactions

- Monitor system health, log all activities, and produce monthly SLA reports, tracking success rates, confirmation times, and uptime

Required Qualifications:

- 5+ years professional Node.js experience

- Deep familiarity with blockchain protocols - ERC-20 & TRC-20 standards, gas/bandwidth/resource models

- Hands-on experience with web3.js, ethers.js, tronweb, and CCXT

- Proven track record designing high-throughput systems with precise nonce and concurrency control

- Solid understanding of cryptographic key management best practices (hot wallets, KMS/Vault, HSM, multi-sig)

- Ability to troubleshoot complex blockchain issues - gas volatility, reorgs, token approvals, API rate limits, TRON resource constraints.

Mindset & Communication:

- Ownership mentality: you balance urgent deliverables with long-term architectural vision

- Organized and reliable: you prioritize critical tasks without sacrificing code quality

- Research-oriented approach: you evaluate tools and patterns, but focus on what works in practice

Nice-to-Have

- Experience writing or integrating batch-transfer smart contracts in a Node.js environment (e.g. OpenZeppelin MultiSend)

- Knowledge of The Graph subgraphs for DEX data analytics

- Prior work in crypto exchange integrations or fintech reconciliation systems