Jobs Fullstack

Job Summary
As a Software Engineer, you will work directly with AI coding models to evaluate their performance, identify weaknesses, debug incorrect outputs, and create stronger alternative solutions. This role is ideal for developers who enjoy problem-solving, code analysis, and improving how AI understands and generates technical answers.

Key Responsibilities

• Work with Frontier Labs, producing training data to train Al models. 
• Test and evaluate agentic coding models designed to perform complex engineering tasks at a senior developer level.
• Focus on creative problem-finding rather than traditional feature shipping. 
• Ideal candidates use AI, enjoy problem-solving, and like "outsmarting" Al systems. 

Requirements

• 3–4 years of hands-on experience as a Full Stack Developer on commercial projects, including B2B SaaS systems and data-heavy applications.
• Use AI tools (AI agents, Claude Code, Cursor, Codex or similar) in daily workflow.  
• Strong judgment across the full software lifecycle:
  • Reading a PRD and breaking it into Jira tickets
  • Estimating effort and scoping work
  • Architecture and design choices
  • Reviewing PRs
  • Debugging and recovering when blocked
• Strong proficiency with React.js and Node.js, with experience using Express.js or NestJS to build scalable backend systems that support complex business logic.
• Experience designing and integrating REST APIs. 

• Upper-Intermediate English (B2). 

   

Bonus:

• Computer Science or related education. 
• Python programming experience. 
• Strong understanding of algorithms and data structures. 

You will be part of building better AI systems by helping improve the quality, accuracy, and reliability of the answers they provide. If you want to use your engineering skills in a fast-growing AI field, this role is a strong opportunity to contribute to the future of AI-assisted development.

SBC Performance drives scalable growth for brands ready to expand globally.

Working across eCommerce, health & wellness, education, and entertainment, our team helps brands acquire customers faster and scale across 26+ global markets. We combine data-driven paid media, performance creative, and advanced analytics to turn marketing into a predictable revenue engine.

Trusted by 200+ companies, managing $150M+ in ad spend.

Scale faster. Grow smarter.

Now, we’re looking for a Full Stack Engineer to join our AdTech product team. Someone passionate about building scalable, data-driven systems that power performance marketing automation and analytics.

Key Responsibilities:

• Design, build, and maintain frontend and backend services for the internal AdTech platform.
• Develop Angular (v12+) applications with TypeScript, using reactive patterns (RxJS, Angular Material, reactive forms).
• Implement and optimize state management and change detection for high-performance UI.
• Build and maintain Node.js microservices with TypeScript and RESTful APIs.
• Work with PostgreSQL (TypeORM) and Firestore (NoSQL) for data modeling and storage.
• Implement asynchronous patterns, error handling, and background data processing.
• Integrate with Google Cloud Platform (GCP): Cloud Functions, Firestore, Cloud Storage, and Secret Manager.
• Utilize Redis caching, message queues (RabbitMQ / Pub/Sub), and efficient pagination/filtering for large datasets.
• Collaborate with product, analytics, and QA teams to deliver robust, scalable AdTech solutions.

Requirements:

• 3+ years of experience as a Full Stack Engineer
• Experience with Node.js, Angular (v12+), and TypeScript in production environments
• Strong knowledge of RxJS, Angular Material, and reactive forms
• Experience with state management and change detection optimization
• Experience with microservices architecture and RESTful APIs
• Proficiency with PostgreSQL (TypeORM) and Firestore (NoSQL)
• Understanding of asynchronous patterns and error handling
• Experience deploying and managing Cloud Functions (triggers, logs, monitoring)
• Knowledge of Firestore queries, indexing, and data modeling
• Familiarity with Cloud Storage and Secret Manager
• Docker basics for local development and testing
• Experience with message queues (RabbitMQ or Pub/Sub)
• Redis caching and session management
• Handling large datasets (pagination, filtering, sorting)

Nice to Have

• Experience with ad platform APIs (TikTok Business API, Facebook Graph API, Google Ads API)
• Working knowledge of BigQuery for analytics and data aggregation
• Experience building worker pools and parallel processing pipelines
• Familiarity with CI/CD pipelines and deployment automation
• Understanding of AdTech concepts — campaigns, budgets, pixels, conversions
• Experience with high-volume, real-time data systems

What We Offer

• Hybrid job in Prague/Warsaw or remote
• Competitive compensation
• Flexible working hours: we start our operation day between 9:00 — 11:00 CET
• All necessary equipment
• Paid vacation and sick leaves
• Educational support: reimbursement of certification, training, and a knowledge-sharing atmosphere
• Company events and multiple internal activities
• Open feedback and transparent direct communication

Privacy Notice: https://sbc-performance.com/notice-privacy-for-recruitment/

Location: Paphos, Cyprus (Hybrid)

Ever wanted to build a platform from scratch instead of spending years maintaining legacy code?

Where your architectural decisions shape a product used by millions of people every week?

Where you'll work directly with company leadership, influence technical direction, and have a clear path toward becoming an Engineering Lead?

If you enjoy building scalable full-stack applications, solving complex engineering challenges, and creating software that powers real-world operations — we'd love to talk.

About the Company

Our client is a UK-based logistics and delivery technology company operating one of the country's largest last-mile delivery networks.

Every week, millions of parcels, newspapers, and essential goods are delivered through their platform for some of the UK's largest retailers and logistics providers.

After more than two decades of operational success, the company is investing in a complete rebuild of its core technology platform using a modern JavaScript ecosystem. This is a true greenfield project where engineering teams have the opportunity to design scalable systems without the burden of legacy architecture.

The company combines the stability of an established business with the speed and engineering culture of a modern product company.

The Role

We're looking for a Senior Full Stack Engineer who enjoys building products end-to-end and wants to play a key role in defining the architecture of an entirely new platform.

Location & Working Model

This is a hybrid position based in Paphos, Cyprus, with two/ three days per week in the office for architecture workshops, technical planning, and collaborative design sessions.

We're looking for engineers who are already based in Cyprus or are ready to relocate for a long-term opportunity. The company offers official full-time employment and can support relocation for the right candidate.

What You'll Do

Full Stack Development

• Build modern web applications using React and TypeScript
• Develop backend services and APIs using Node.js
• Design scalable database structures with PostgreSQL
• Deliver features from concept through production deployment

Architecture & Engineering

• Design scalable, maintainable system architecture
• Make technical decisions that support long-term platform growth
• Build cloud-native applications using AWS and Docker
• Contribute to architecture discussions and technical planning

Leadership & Mentorship

• Mentor engineers through code reviews and technical guidance
• Help establish engineering standards and development best practices
• Collaborate closely with the CEO and CTO on product direction
• Grow into leading a team of engineers as the organization scales

Product Collaboration

• Work directly with business stakeholders to translate operational needs into software
• Build internal platforms used daily by operations teams, dispatchers, and drivers
• Continuously improve products based on real customer and business feedback

What You Bring

• 5+ years of commercial Full Stack development experience
• Strong React and modern frontend architecture experience
• Excellent knowledge of Node.js and TypeScript
• Experience designing REST APIs and scalable backend systems
• Strong knowledge of PostgreSQL and relational database design
• Experience working with AWS and Docker
• Understanding of software architecture, scalability, and engineering best practices
• Experience mentoring developers or leading technical initiatives
• Upper-Intermediate English or higher

Nice to Have

• Experience with Prisma ORM
• Experience designing distributed systems
• CI/CD and cloud infrastructure experience
• Experience building high-load or mission-critical applications
• Previous experience leading engineering teams

What You Get

• Official Employment: Full-time employment with a Cyprus-based company.
• Relocation Opportunity: Candidates willing to relocate to Cyprus for a long-term role are welcome to apply.
• Greenfield Product Development: Build a completely new platform using modern technologies instead of maintaining legacy systems.
• Real Technical Ownership: Influence architecture, engineering standards, and long-term technical decisions from day one.
• Leadership Growth: Clear progression toward an Engineering Lead role as the team expands.
• Direct Access to Leadership: Work closely with the CEO and CTO in a fast-moving, engineering-driven environment.
• Hybrid Flexibility: Collaborate in person for architecture sessions while enjoying focused remote work during the rest of the week.
• Engineering-First Culture: High autonomy, thoughtful decision-making, and an environment where technical excellence is valued over bureaucracy.

Interested?

Apply now if you're excited about building modern full-stack platforms, designing scalable architecture, and helping shape the future of a product used by millions of people every week.

Про проєкт:
Інноваційний стартап, що працює на перетині AI та real-time комунікацій.
Мета — створити сучасний web-додаток із розумними алгоритмами, швидкою взаємодією та self-hosted інфраструктурою.

Ваші задачі:

• Розробка та підтримка web-додатку на Next.js.
• Інтеграція real-time функцій через WebRTC / LiveKit.
• Робота з Supabase (Postgres), включно з локальним розгортанням.
• Створення інтерфейсів із Tailwind CSS + shadcn/ui.
• Оптимізація архітектури, CI/CD, GitOps, деплой на Vercel.
• Активне використання AI-інструментів (ChatGPT, Gemini, Claude, Cursor) у процесі розробки.
   

Основні вимоги (Must-have):

• Глибокі знання Next.js та екосистеми React.
• Досвід Full-stack розробки на TypeScript / JavaScript.
• Практичний досвід роботи з WebRTC (чат або відео-застосунки).
• Знання одного з ORM — Drizzle (перевага) або Prisma.
• Володіння Git / GitOps.
• Регулярне використання AI-асистентів у розробці.
   

Буде плюсом:

• Інтеграція Stripe або робота з Firebase.
• Знання Docker, GitLab CI/CD, досвід налаштування пайплайнів.
• Розуміння Cloudflare Workers або Edge Computing.
• Базові знання Python

We invite Senior Full-Stack Developer with expertise in Go and React to join our team for remote, long-term cooperation.

To help build and scale a next-generation B2C digital platform.

Requirements:

• 3+ years of comprehensive full-stack development experience
• 2+ years experience with Go(Golang) and React.js
• Strong and confident knowledge of TypeScript.
• Proficiency in both SQL and NoSQL database systems
• Upper-Intermediate level of English proficiency (reading, writing, and speaking)
• Remote team members are expected to travel to our EU office from time to time for on-site meetings.
• Proven ability to perform autonomously and collaborate within cross-functional teams
• Responsible approach to assigned tasks and deadlines

We offer:

• Flexible work model allowing remote, on-site, or hybrid options.
• Optional relocation to our EU office, with complete legal support throughout the process.
• Paid vacation and sick leave
• Comprehensive health insurance and sports membership reimbursement
• Reimbursement of necessary transportation expenses
• Friendly and collaborative atmosphere, dedicated mentorship, various performance-based bonuses and company benefits
• Multinational team of expert software engineers
• Free participation in educational programs and professional courses

• English lessons with native-speaking instructors.

   

Further information will be shared at the interview stage.

Kindly add your Telegram username to your CV.

Build the Operating System for Autonomous Maritime Procurement

A-GOS is a VC-backed AI startup building the autonomous procurement infrastructure for the global maritime industry $100b market.
 

We are looking for an exceptional founding engineer to join our core team and help build a category-defining company from the ground up.

You will work directly with the founders and CTO, shape the architecture, influence the product and own complete features across backend, frontend and AI systems.
 

What You Will Build

• Python backend and scalable APIs
• VUE.js product user interfaces
• AI agents and autonomous workflows
• Procurement, inventory and supplier systems
• The technical foundation for a global maritime platform

What We Expect

• Strong full-stack engineering experience
• Deep backend expertise with Python
• Experience with vue/nuxt
• Solid knowledge of databases, cloud and system architecture
• Ownership mindset and ability to build in uncertainty
• Ambition to create something far bigger than another software product

Why A-GOS

• Join the founding team of a VC-backed startup
• Build for a global multibillion-dollar industry
• Shape the company, product and technology from day one
• Grow into a key technical leadership role
• Potential equity based on long-term contribution
   

We are not hiring someone to complete tickets.
 

We are looking for a founding engineer who wants to help build the future of autonomous commerce.

About the Company

Celtara is a fast-growing portfolio of Health & Wellness e-commerce brands operating in the U.S. market.
 

Our brands focus on subscription-based nutritional products designed to support gut health, immunity, metabolic wellness, and overall well-being.
 

As we scale multiple DTC brands, we are looking for a highly technical Shopify specialist who can own not only store operations, but also the ecommerce systems, integrations, tracking infrastructure, subscriptions, analytics, and troubleshooting required to support sustainable growth.

About the Role

We are looking for someone who understands the entire ecommerce ecosystem around Shopify and can confidently work across subscriptions, tracking, analytics, integrations, checkout customization, retention systems, and operational troubleshooting.
 

You will work closely with the Brand CMO, marketing, operations, logistics, and customer support teams to ensure our stores operate efficiently and our data remains accurate and actionable.

Core Responsibilities
 

Shopify Operations

• Manage Shopify store configurations, products, collections, discounts, metafields, and Shopify Markets
• Support Shopify Plus functionality and checkout customization
• Troubleshoot store issues and improve operational workflows
   

Subscription & Retention

• Manage and optimize Recharge subscriptions
• Support failed payment recovery, cancellations, skips, swaps, and retention workflows
• Monitor subscription performance, retention metrics, and customer lifetime value (LTV)
   

Tracking, Analytics & Attribution

• Validate and troubleshoot ecommerce tracking across Shopify, Meta, Google, and attribution platforms
• Investigate data discrepancies and event tracking issues
• Monitor customer acquisition performance, retention metrics, and LTV trends
• Support reporting and KPI analysis
   

Ecommerce Systems & Integrations

• Maintain integrations between Shopify and platforms such as Recharge, Klaviyo, review tools, loyalty systems, and other ecommerce applications
• Configure and troubleshoot automations, workflows, and webhooks
   

CRO & Technical Maintenance

• Support A/B testing initiatives
• Improve checkout performance and customer experience
• Maintain store stability, integrations, and technical infrastructure
   

Documentation & Process Improvement

• Create and maintain SOPs
• Document technical solutions and operational processes
• Improve operational consistency across brands

Required Experience

Shopify

• Shopify Plus
• Shopify Admin
• Metafields
• Shopify Flow
• Liquid
• HTML / CSS / JavaScript
• Shopify APIs (GraphQL / Admin API)

Subscription & Retention

• Recharge (required)
• Experience working with subscription-based businesses
• Understanding of retention metrics and LTV

Tracking & Analytics

Experience with several of the following:

• Elevar
• Triple Whale
• Hyros
• GA4
• GTM
• Microsoft Clarity
• Hotjar

Server-Side Tracking

Experience with:

• Meta CAPI
• Server-side tracking
• Event validation
• Event deduplication

Ecommerce Systems

Experience with several of the following:

• Klaviyo
• Zendesk
• PostPilot
• Octane AI
• Judge.me
• Yotpo
• Rivo
• Loyalty platforms

Technical Troubleshooting

Ability to independently diagnose and resolve:

• Tracking issues
• Subscription issues
• Checkout issues
• Integration failures
• Data discrepancies

Nice to Have

• BigQuery, SQL, or Google Cloud experience
• Marketplace integrations
• Chargeflow or NoFraud
• Affiliate platforms (GOAFFPRO, Levanta)
• Health & Wellness ecommerce experience

What We Offer
-Competitive salary
-Fully remote & flexible schedule
-Fast-growing e-commerce environment
-Learning & career growth
-Work with experienced team & experts

Performa is an international HR agency specializing in connecting top talent with leading companies across the iGaming, IT, and Marketing industries. We help businesses scale their teams and support professionals in finding opportunities where they can unlock their full potential.
 

Our client is a fast-growing international AI-native product company developing an innovative SaaS platform that helps businesses automate complex workflows, process large volumes of data in real time, and build intelligent, scalable products. AI is deeply integrated into both the product and the engineering culture, with modern development practices and continuous innovation at the core of the company's approach.
 

The engineering team works with a modern technology stack, follows high software quality standards, and encourages ownership, collaboration, and continuous improvement. As the product continues to scale, the company is looking for an experienced Senior Full-Stack Developer to join its engineering team.
 

Role Overview

This is a product-oriented full-stack role with an approximate split of 70% backend (Python/Django/AI) and 30% frontend (Angular). 

The primary focus is hands-on development, while a portion of the role involves working closely with product and design teams to contribute to product strategy, UI/UX, and roadmap decisions. 

Requirements:

• Software development experience.
• 6+ years of strong Python development experience.
• Proven expertise with Django and Celery.
• 1+ years of solid Angular 19 frontend development experience.
• AI/ML knowledge and practical implementation experience.
• Strong understanding of software architecture and scalable system design.
• Ability to translate business requirements into technical solutions.
• Experience using modern AI-powered development tools to increase productivity.

Key Responsibilities

• Architect and develop AI-powered solutions and intelligent agents.
• Design and maintain scalable backend systems using Python, Django, and Celery.
• Build modern frontend applications using Angular 19 and Tailwind CSS.
• Integrate machine learning models into production environments.
• Drive product decisions and contribute to product strategy.
• Collaborate with stakeholders to define requirements and priorities.
• Mentor team members and promote engineering best practices.
• Combine technical leadership with product ownership to ensure successful product delivery.

What we offer:

• Competitive salary.
• Equity participation opportunities.
• Flexible remote work environment.
• Health insurance and wellness budget.
• Learning and conference budget.
• Latest hardware of your choice.
• Opportunity to have a direct impact on both product and technology decisions.

We are looking for a Senior Full-Stack PHP Developer for our client — a national eCommerce retailer with 20+ years of history. The company represents dozens of global premium and mid-segment brands in Ukraine and is actively developing its own digital products.

The team is growing, so we are looking for one more strong engineer who can contribute not only to feature delivery, but also to architecture, code quality, and product development.

Tech stack

PHP, Laravel, Vue.js / Nuxt.js, TypeScript, MySQL, REST API, HTML, CSS, SASS.

Responsibilities

You will work on the development and improvement of the company’s eCommerce platform and internal online products. The role includes building new features, supporting and improving existing functionality, integrating internal and external services, working with REST APIs, optimizing performance, writing automated tests, and participating in architectural discussions.

Requirements

• 5+ years of commercial experience with PHP.
• 2+ years of experience with Laravel.
• 2+ years of experience with Vue.js / Nuxt.js.
• Strong knowledge of OOP, design patterns, and SOLID principles.
• Understanding of DDD principles.
• Experience with REST API development.
• Experience writing automated tests.
• Practical experience with TypeScript.
• Strong knowledge of HTML, CSS, SASS.
• Experience with MySQL.
• Technical higher education will be a plus.

The company offers

• Fully remote work.
• Paid vacation.
• Paid sick leave.
• Compensation for conferences and professional education.
• Partial compensation for sports activities.
• Support with English language learning.
• Discounts on company products.

Who we are:
My partner (from Ukraine) and I started a window cleaning business in the US. We needed better software to run it, so we built our own. That became blueworks.app, a field service CRM (scheduling, quotes, invoicing, SMS/voice, payments) for window cleaning, landscaping, and similar businesses. Today 220+ active businesses are subscribed and we're growing fast. https://blueworks.app/

The app was built solo, AI-first ("vibe coded"), and it works and works pretty well. Now we're hiring our first developer to help us grow it properly.

Stack: React 18 + TypeScript, Node.js/Express, PostgreSQL (Drizzle), Tailwind + shadcn/ui, Capacitor (iOS/Android), Twilio, Stripe.

What you'll work on:

• Security: audit and harden the app (multi-tenant isolation, auth, webhooks)
• Performance: make the app faster and more efficient
• Offline mode, big one: techs must be able to work in the field without signal
• Advanced statistics: big reporting/analytics upgrade of all users
• UX flows: smooth out and improve core user flows
• Internal CRM: build our own tool for client follow-ups
• Plus ongoing smaller features and fixes

Who you are:

• Strong with our stack (React/Node/TypeScript/Postgres)
• AI-native: you use Cursor / Claude Code / Replit daily, but you read, understand code you ship
• Self-driven, product-minded, comfortable working directly with founders
• Good English or Ukrainian/Russian communication

Details:

• Full-time only: this is not a part-time or freelance gig, we want someone fully committed
• Remote, long-term role with room to grow into a lead position as the team expands
• Paid test task as part of hiring.

GR8_TECH builds B2B iGaming platforms for operators who play to lead.

We deliver full-cycle, high-impact tech designed to scale — from seamless integrations and expert consulting to long-term operational support. Our platform powers millions of active players and drives real business growth. Call it what it is: the iGaming Platform for Champions.

With 1000+ GR8 people across locations and time zones, we don’t just ship technology — we help operators build success stories across brands, markets, and geos.

Our ambition drives us. Our people make it real.

If you’re a challenger in spirit and a champion in action — join us.
 

Why this role exists:

As a Senior Full-Stack .NET Engineer, you will play a critical role in designing, developing, and maintaining enterprise-level applications across our backend stack based on .NET, Node.js, Go and related technologies. You will lead technical discussions, mentor junior team members, and collaborate with cross-functional teams to deliver scalable and robust software solutions that meet business requirements and industry standards. This role offers the opportunity to make a significant impact, shape product direction, and contribute to the growth and success of the team.
 

What you’ll drive:

Architecture & Execution

• Design and implement scalable, efficient, and secure enterprise-level software architectures across our .NET stack.
• Write, test, and debug complex code for high-load systems with strict latency and reliability requirements.
• Deliver clean code to production in a timely manner, balancing business speed with technical excellence.
• Identify and eliminate performance bottlenecks across CPU, memory, I/O, and database layers.

Engineering Quality & Observability

• Conduct thorough code reviews to enforce strict code quality, security, and industry best practices.
• Develop and enforce testing protocols to guarantee software reliability and flawless production performance.
• Implement and monitor production observability frameworks, including logging, metrics, monitoring, and distributed tracing.
• Create and maintain concise, meaningful technical documentation for system designs and architecture.

Collaboration & Leadership

• Provide guidance and mentorship to junior and mid-level engineers, actively fostering their technical growth.
• Partner with Delivery Managers to lead and manage software development projects, ensuring predictable, high-quality delivery.
• Collaborate closely with product management, design, and operations teams to align technical execution with business goals.
• Communicate effectively with stakeholders, translating complex technical concepts into clear project updates.
   

What makes you a GR8 fit:

• Minimum 5 years of experience in a similar senior engineering role with a track record of leadership, strong technical skills, and successful project delivery.
• Deep hands-on expertise in C# and .NET (Core / .NET 6+).
• Commercial experience or a strong willingness to learn and work with Golang and Node.js.
• Experience designing and evolving high-load backend systems with strict latency and reliability requirements.
• Experience working REST API and web services.
• Strong understanding of async/await, multithreading, thread safety, memory management, and performance optimization.
• Ability to identify and eliminate performance bottlenecks across CPU, memory, I/O, and database layers.
• Experience designing and operating microservice-based systems.
• Experience working with relational and non-relational databases.
• Understanding of transactions, isolation levels, locking, concurrency, indexing strategies, and performance tuning.
• Experience working with containerized environments including Docker and Kubernetes.
• Understanding of CI/CD pipelines and automated delivery.
• Understanding of scalability, load balancing, auto-scaling, and disaster recovery.
• Understanding of production observability including logging, metrics, monitoring, and tracing.
   

Why you’ll love working here: 

Benefits Cafeteria — annual budget you allocate to:

Sports • Medical • Mental health • Home office • Languages.

Work-life & support

• Paid maternity/paternity leave + monthly childcare allowance.
• 20+ vacation days, unlimited sick leave, emergency time off.
• Remote-first + tech support + coworking compensation.
• Team events (online/offline/offsite).
• Learning culture with internal courses + growth programs.
   

Our culture & core values:

GR8_TECH culture is how we win — through trust, ownership, and a growth mindset. We move fast, stay curious, and keep it real, with open feedback, room to experiment, and a team that’s got your back.

FUELLED BY TRUST: we’re open, honest, and have each other’s backs.

OWN YOUR GAME: we take initiative and own what we do.

ACCELER8: we move fast, focus smart, and keep it simple.

CHALLENGE ACCEPTED: we grow through challenges and stay curious.

BULLETPROOF: we’re resilient, ready, and always have a plan.

About the role 

We are looking for a strong Senior / Lead Full-Stack Platform Engineer to join a technically complex cryptocurrency product environment. This role is not for someone who only completes tasks based on specifications. We need a full-cycle engineer who can independently design, build, review, and bring solutions to production level. The ideal candidate can think beyond the codebase, understand architecture, product and technical risks, and make responsible decisions around security, scalability, stability, observability, testability, and long-term system maintenance. This role involves working across mobile, web, desktop, backend, infrastructure services, data processing systems, cryptocurrency business logic, wallet infrastructure, and blockchain integrations.

What you’ll do (day to day) 

- Design, build, and maintain scalable full-stack applications using .NET/C#, React, and TypeScript.
- Drive technical architecture and make key engineering decisions.
- Build secure, reliable, and maintainable solutions for cryptocurrency products and wallet infrastructure.
- Design APIs and backend services with scalability and performance in mind.
- Improve system reliability, monitoring, logging, and observability.
- Review code, mentor engineers, and promote engineering best practices.
- Collaborate with product and engineering teams throughout the development lifecycle.
- Leverage AI tools to accelerate development while ensuring code quality and maintainability.

What you’ll need 

• Strong commercial development experience in real production systems.
• Confident knowledge of C#/.NET.  + React, TypeScript 
• Experience designing architecture, not only implementing ready-made tasks.
• Strong understanding of OOP, SOLID, DRY, KISS, YAGNI, design patterns, and clean code principles.
• Good knowledge of asynchronous programming, multithreading, race conditions, deadlocks, thread safety, and background jobs.
• Understanding of memory management, object lifecycle, resources, and IDisposable.
• Knowledge of data structures, algorithms, Big O complexity, collections, queues, dictionaries, and caching.
• Experience with HTTP, REST APIs, WebSocket, RPC approaches, JSON, binary formats, and backward compatibility.
• Experience with databases, SQL, indexes, transactions, locks, and query optimization.
• Understanding of application security: validation, secrets management, authentication, authorization, and common vulnerabilities.
• Experience with unit, integration, and e2e testing, mocking, and testability by design.
• Experience with Git, CI/CD, code review, and branching strategies.
• Ability to diagnose production issues using logs, metrics, monitoring, tracing, and profiling.
• Understanding of error handling, retry policies, idempotency, graceful degradation, and migration strategy.
• Ability to work independently in uncertain and fast-changing environments.
• Strong ability to use AI tools practically in development, not only as code completion.
• Ability to critically review AI-generated code and architectural suggestions.
• Strong attention to detail, responsibility, and engineering thinking.
• Russian language proficiency. - not for djinni

Nice to have

- Experience in cryptocurrency, blockchain, fintech, wallets, or payment systems.
- Experience with modular or plugin-based architecture.
- Experience with cloud infrastructure and distributed systems.
- Experience building high-load or performance-critical applications.
- Previous experience as a Lead Engineer, Tech Lead, Staff Engineer, or Software Architect.

What Company offers 

•  A friendly, creative team where you own your work 
• Competitive compensation package.
•  All the tools and tech you need 
• Dynamic, fast-paced international environment.
• Long-term career growth opportunities within a rapidly expanding company.

About the company

A fintech startup building a banking and cash-management platform for businesses that sell physical goods. The company automates the financial backend for consumer brands. The team is small but mighty — people who've come from companies like Shopify, Square, Rippling, and Toast.

About the role

You'll help shape where the product goes next — working closely with engineers, designers, and founders to design, build, and iterate on core parts of the platform. You'll own projects end-to-end: from scoping and building to testing, shipping, and refining based on real-world user feedback.

We're looking for someone who loves crafting clean, fast, and intuitive user experiences, is comfortable with ambiguity, writes maintainable, high-quality code, and wants to contribute to the engineering culture. You can be strong in backend or frontend (or both), but you should be willing to work across the stack when needed.

Requirements

• 5+ years in full-stack software engineering
• Proven ability to lead and deliver technically challenging, cross-functional projects
• Kotlin, TypeScript / React, PostgreSQL, Google Cloud
• Comfortable designing APIs, debugging complex systems, and writing tests
• Interest in (or willingness to learn) basic financial concepts
• Strong product sense and the ability to make thoughtful tradeoffs
• Knows when to ship vs. when to refactor

Nice to have

• Startup or small-team experience
• Experience with B2B products like Square or Toast
• Experience with consumer apps like Cash App, Robinhood, and Coinbase

Details

• Work setup: in-person, five days a week (New York or Toronto) — no remote option
• Location: New York or Toronto
• Visa: open to H1B transfers and TN visas for Canadian candidates
• Meaningful equity
• Full-time
• Actively hiring several engineers for this role

We are looking for a Senior Full Stack Engineer who is comfortable working on high-load, distributed systems and making architectural decisions, not just implementing tasks.

At MMDSmart, you will work on a CPaaS/CCaaS platform handling messaging and voice communication at scale. This is not a typical CRUD product: you’ll deal with real-time flows, external integrations, billing complexity, and systems where design mistakes surface quickly in production.

You will be expected to take ownership from design to delivery and challenge assumptions when needed.

Since 2007, MMDSmart has been a leading supplier in cloud-based business communications, delivering game-changing IT products to businesses in over 100 countries. Our success is fueled by the inspiration and innovative ideas of our team members, encouraging their growth and impacting our Messaging andVoice solutions. These empower our clients to communicate more effectively with their customers. Don’t miss this chance to excel in a rapidly expanding tech company, where your potential and ambitions are not just recognized but celebrated.

What will you do at MMDSmart?

• Design and implement new platform capabilities across backend and frontend (not just “features” but system-level improvements);
• Contribute to architecture decisions in a microservices environment (Go-based services, event-driven patterns, APIs);
• Build and evolve React-based interfaces used by enterprise customers and internal teams;
• Work on integrations with external vendors (messaging providers, voice, billing systems);
• Investigate production issues in a high-scale environment and drive them to resolution—not just patch them;
• Participate in technical discussions, trade-off analysis, and system design reviews;
• Occasionally lead initiatives or own a domain end-to-end.

You are a perfect match if you have:

• 4+ years of real production experience as a Full Stack Engineer;
• Strong backend expertise with Go (3+ years), not just syntax, but concurrency, performance, and system design;
• Solid frontend experience with React + TypeScript (2+ years);
• Experience building or maintaining distributed systems / microservices;
• Good understanding of data modeling (SQL + NoSQL) and when to use each;
• Ability to debug complex issues across services (not limited to your own code);
• Comfortable working in an environment where requirements evolve and not everything is predefined.

Will be a plus:

• Experience with real-time systems, messaging, or telecom domains;
• Familiarity with event streaming (Kafka or similar);
• Experience with cloud platforms (GCP preferred);
• Exposure to billing systems or high-throughput APIs.

What you get:

• Work on systems that actually operate at scale and have real business impact;
• A team where senior engineers are expected to influence architecture, not just execute;
• Remote work.

Why do talents choose and stay at MMDSmart?
Embrace the opportunity to work in a company that cares about:

Your Wellness: Access to mental health programs, comprehensive medical insurance, and a sports card*.

Your Happiness: Enjoy the company of cool teammates, a friendly atmosphere, a strong mentorship, and a variety of bonuses & corporate gifts.

Your Development: Benefit from free educational events & courses, and English classes with native speakers.

Your Career: Focus on your professional development in a supportive environment.

Work-Life Balance: Choose your working format – remote, office-based, or hybrid and engage in team-building activities.

Think this role’s got your name on it? Go ahead and apply, we’d love to see what you’ve got!

*Medical Insurance and Sport Card perks are available for employees located in Bulgaria.

Equal-Opportunity Employment
We are an equal opportunity employer committed to creating a diverse and inclusive work environment. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.

About the Role

The Web & Digital Operations Manager owns the technical health of Liminal's web presence and our clients' websites. This is the person who makes sure roughly 45 client sites and our own site stay secure, fast, backed up, and live. They will coordinate our offshore development partner, own hosting, run the technical side of every site launch, and maintain the internal brand messaging app.

When a site goes down, a launch stalls, or a plugin breaks something, the person in this role is accountable for the fix.

Responsibilities

Web Development Oversight and Quality Control

• Own quality control across all client and Liminal websites.
• Coordinate our offshore development partner (Alpinist Studios), who builds and migrates sites. Review their work, manage the queue, and make sure results meet our standard.
• Run the technical launch checklist for every site: DNS and MX records, domain access, redirects, admin access, and contact-form routing.

Hosting And Maintenance

• Manage web hosting and the hosting vendor relationship (currently WP Engine).
• Run ongoing maintenance across all sites: plugin updates (WP Engine and non-WP Engine), off-site AWS backups, and scheduled overnight maintenance.
• Set up and troubleshoot site analytics (Google Analytics, Site Kit, MonsterInsights).

Liminal Internal Website

• Build and maintain meetliminal.com: case study pages, SEO and GEO optimization, mobile fixes, popups, and ongoing updates.

Brand Messaging App (Vibe Coded)

• Maintain and improve Liminal's internal brand messaging app: build and refine features (onboarding flow, org profile, brand voice, brand guide quality score, org health assessment, competitive analysis, search/chat), fix bugs, handle UI/UX, and manage document generation and formatting.

What We're Looking For

• Hands-on WordPress expertise, including page builders (Beaver Builder, Elementor) and plugin management at scale.
• Real experience managing hosting environments, DNS, domains, backups, and site migrations.
• Comfort coordinating the work of an outside development partner and holding their work to a high-quality standard.
• Working knowledge of web analytics setup (GA4, Site Kit, MonsterInsights) and technical SEO.
• Product/app skills to maintain and extend a web application (front-end and light back-end).
• Organized and self-directed. This role runs largely on its own across many sites at once.
• Genuine interest in equity-centered nonprofit work. The person doesn’t have to come from the sector, but should care about the work of the clients we serve.