Jobs Fullstack

Your Go experience caught my eye! We’re building a team for an international CPaaS platform that powers messaging for AliExpress and 500+ global brands. And looking for a Full Stack Engineer (Go + React). 15+ years on market, flexible remote setup, strong team.

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.

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.

Main Responsibilities

– 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

Mandatory Requirements

– 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

We offer

– 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.

Your engineering maturity caught my eye! For a product company we`re seeking a Senior Full Stack to design systems with full ownership. High-load, event-driven architecture, no micromanagement. Even if you’re new to Go/React, your system thinking is key to starting this path. 

Experience with Go and/or React is an advantage but not required.

Main Responsibilities

– Design and implement features from idea to production

– Work across backend, frontend, APIs, databases, and integrations

– Participate actively in Scrum ceremonies and contribute to planning and estimation

– Take architectural decisions and improve existing system design

– Write clean, testable, maintainable code

– Perform code reviews and mentor other engineers

– Improve performance, reliability, and scalability of the system

– Work closely with Product, QA, and DevOps

Mandatory Requirements

– 7+ years of hands-on software engineering experience

– Strong understanding of system design and architecture

– Proven experience building and maintaining high-load, event-driven systems

– Ability to work across the full stack (backend + frontend)

– Experience working in Agile / Scrum teams

– Strong ownership and accountability for delivered features

– Solid understanding of APIs, databases, and modern web architectures

– Experience with Git and CI/CD workflows

– Ability to learn new technologies quickly and independently

Will be a plus

– Experience with Go

– Experience with React or modern frontend frameworks

– Experience with microservices and distributed systems

– Experience with cloud environments and containers

– Experience with observability and monitoring tools

We offer

– 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.

N-iX is a global software development company founded in 2002, connecting over 2,400+ tech professionals across 40+ countries. We deliver innovative technology solutions in cloud computing, data analytics, AI, embedded software, IoT, and more to global industry leaders and Fortune 500 companies. Join us to create technology that drives real change for businesses and people across the world.

Our client - Europe's largest online car marketplace with 30M+ monthly users across 18 countries - is investing in a next-generation Agentic Software Delivery platform. The goal is to enable autonomous engineering at scale, starting with SDLC automation and expanding further: humans steer, agents deliver.
This is a greenfield environment. A dedicated team will build an end-to-end platform on AWS, integrating with internal systems and delivery processes. The target is for 10–20% of JIRA stories to be handled through fully autonomous delivery within 12 months.

We are looking for a self-driven Full-Stack Engineer with AI experience who thrives in ambiguity and takes ownership without waiting to be directed. This is a proactive role - you are expected to identify problems, propose solutions, and drive them independently.
In addition to engineering, ~10% of your time will involve working with internal delivery teams: understanding their SDLC processes, identifying friction points, and feeding insights back into the platform. You will also support adoption by explaining and promoting the solution across teams.

Must-Have Requirements:

• 5-7+ years of full-stack software engineering experience.
• Hands-on experience with agentic coding tools (e.g. Claude Code, GitHub Copilot, Codex, Cursor) and an understanding of how they work underneath: model APIs, tool calling, agent loops, context management.
• Understanding of LLM API and tool-use patterns: function calling, tool orchestration, and the ability to integrate AI models programmatically, not just through existing UIs.
• Ability to evaluate trade-offs between off-the-shelf agentic tools and custom API-based implementations.
• Genuine enthusiasm for and an informed opinion on where agentic tooling is heading.
   
• Strong full-stack fundamentals; comfortable owning significant pieces end-to-end across frontend and backend.
• Solid Java and React experience (primary stack) OR Python with any modern frontend framework.
• Proactive, self-driven mindset, able to work independently without detailed instructions.
• Hands-on AWS experience is a strong plus.
• Strong communication skills in English (B2–C1).
• Comfortable working in greenfield environments with evolving requirements.

Strong Plus:

• Workflow Engines: Experience with workflow or orchestration engines (e.g. Camunda, N8N, or similar).
• Camunda experience specifically is a significant advantage given the current architectural direction.
• Familiarity with AWS AI services; AWS AI Practitioner certification (AIF-C01) is a notable bonus.
• Exposure to cloud-native orchestration patterns and multi-agent system design.

Mindset & Soft Skills:

• Proactive and self directed, drives outcomes without waiting for direction.
• Comfortable with ambiguity, makes pragmatic decisions when the path is not fully defined.
• Strong technical communication, effectively collaborates with peer engineers to understand domain context.
• Forward thinking, stays current with the AI and agentic tooling landscape and brings new ideas.
• Energized by transforming software delivery, not just a participant but a believer.

We are seeking Senior Google Tag Developer to support the implementation of its new headless e-commerce platform. This role will be responsible for designing, developing, validating, and maintaining the JavaScript data layer used by Google Tag Manager, Google Analytics, and related analytics and marketing platforms.
 

Required Qualifications

• Strong hands-on experience with JavaScript (preferably React and/or Next.js.)
• Experience developing data layer implementations for Google Tag Manager.
• Experience with window.dataLayer and dataLayer.push() event structures.
• Understanding of single-page application tracking challenges.
• Experience with e-commerce tracking requirements.
• Ability to translate business analytics requirements into technical implementation details.
• Strong browser debugging skills using Chrome DevTools, GTM Preview Mode, and analytics debugging
  tools.
• Experience troubleshooting event timing, duplicate events, state changes, and asynchronous data
  availability.
• Ability to work with APIs, JSON payloads, and structured data.
• Strong documentation and communication skills.
• Experience working in Agile development environments.
   

Nice to Have:

• Experience with Salesforce platforms
• Familiarity with Jira, Azure DevOps, GitHub, GitHub Copilot, and CI/CD processes.
• Experience writing QA-ready technical specifications and acceptance criteria.
   

Responsibilities

• Design and maintain the JavaScript data layer
• Implement e-commerce events (product, cart, checkout, purchase, login, subscriptions, promotions)
• Ensure correct event timing and data accuracy in SPA/SSR (React / Next.js)
• Prevent and fix duplicate, missing, or incorrect events
• Integrate with GTM and GA4 and ensure data usability (reporting, attribution, personalization)
• Translate requirements into data layer specifications
• Collaborate with Frontend, QA, Analytics teams
• Ensure consent-aware tracking
   

What We Offer

• Fully remote work
• International team with clear processes
• Paid vacation, holidays, and sick leave

Requirements:

• 1–3 years of commercial development experience;
• Strong knowledge of JavaScript and TypeScript;
• Experience with Node.js and/or Bun.js;
• Experience with Vue.js is preferred; React is also acceptable;
• Good understanding of full-stack web application development;
• Understanding of WebSockets and real-time communication;
• Experience working with PostgreSQL;
• Good understanding of asynchronous programming;
• Confident working with the Git version control system;
• Strong analytical and problem-solving skills;
• Intermediate level of English.

Would be a plus:

• Experience with modern backend architecture and API design;
• Experience working with ORMs or query builders;
• Familiarity with deployment, CI/CD, and cloud environments;
• Experience building scalable products or SaaS platforms.
• Experience using AI tools for coding to improve productivity;

Responsibilities:

• Develop and maintain full-stack product features with attention to quality and performance;
• Participate in end-to-end development, from idea to production;
• Build both backend and frontend parts of the application;
• Work with real-time features using WebSockets;
• Deliver features quickly and efficiently.

About the Project

We are supporting a long-term client with a strong background in React and Node.js development, working with major telecom companies such as AT&T, Vodafone, and Telos International.

This engagement marks a new direction for the client: their first Shopify-based project.

The end customer operates in the mobile device diagnostics industry, providing a proprietary system that combines hardware (USB diagnostic hubs) and software to automatically assess the condition of mobile devices (battery health, memory, display, etc.) when plugged in.

Their solution allows retailers and telecom operators to instantly evaluate returned phones without sending them to repair centers, significantly reducing logistics costs and turnaround times.

The company originally started in the law enforcement sector, building tools for mobile data extraction during investigations, before pivoting into commercial telecom and retail diagnostics.

Project Overview

• Existing Shopify store already exists for mobile devices, but the new project is expected to be a significant rebuild or extension rather than a simple theme update
• Strong focus on backend-heavy Shopify development
• Work will include:
  • Custom Shopify app development
  • API integrations between Shopify and external systems
  • Logistics and warehouse workflow automation
  • Connection between Shopify storefront and proprietary diagnostic backend platform
• Scope is expected to go beyond standard Shopify theme customization

Technical Focus

We are specifically looking for a Shopify Developer with strong backend capabilities, including:

• Shopify Apps (custom/private apps)
• Shopify Admin API / Storefront API
• Node.js backend development
• API design & integrations
• Experience with warehouse/logistics or ERP-style systems (strong plus)
• Ability to work on system architecture beyond frontend theming

Ideal Candidate

You are a strong fit if you:

• Have solid Shopify backend / app development experience
• Are comfortable building integrations between Shopify and external systems
• Think in APIs, workflows, and system architecture rather than only themes/UI
• Can work independently in an initially unclear scope
• Communicate clearly and reliably in a fast-moving client environment

We’re Hiring Shopify Developers Who Actually Care About Building Stores That Perform

At The Conversion Haus, we’re a CRO-focused agency working with eCommerce brands to improve performance, better UX, faster sites, higher conversion rates.

We’re not here to just “build pages.” Everything we do is tied to results.

We’re looking for a Shopify developer who understands that. Someone who takes pride in clean builds, thinks about performance, and can work closely with designers and strategists to ship solid work quickly.

You’ll be working on real brands, real problems, and real opportunities to improve how sites convert.

If you want to...

Build Shopify stores that are designed with performance in mind
Work alongside designers to bring high-converting pages to life
Focus on speed, UX, and clean, maintainable code
Be part of a team that tests, iterates, and improves constantly
Work with eCommerce brands that actually care about growth

This could be a good fit.

Apply ONLY if you…

Are reliable and communicate clearly
Write clean, structured code (Liquid, HTML, CSS, JS)
Pay attention to detail and don’t cut corners
Can take feedback and implement changes quickly
Are comfortable working at a steady pace with ongoing iterations
Have a solid setup (good internet, good machine)

We’re looking for people who take their work seriously and want to get better.

We pay well for strong developers who consistently deliver.

We handle the strategy and design, your job is to execute properly and help bring everything together.

If that sounds like your kind of role, apply.

If you know someone solid, feel free to send this their way.

If you’ve read this, add “66” to your application.

About the Role

We’re looking for a Fullstack Engineer with strong experience building AI-powered products to help us grow our gaming & infrastructure platform.

You’ll join a fast-moving, AI-first team where you’ll design, build, and ship features end-to-end — from model integration and prompt engineering to the UI users interact with. You’ll work with LLMs, video generation, and ML pipelines as part of your daily workflow, using AI tools to move faster and build better.

This role is ideal for someone who already builds with AI in production, thinks in terms of product value, and wants real ownership — not just coding tickets. At PlayMe, we move fast, avoid bureaucracy, and give engineers full ownership to make decisions and deliver impactful products used by real people.

Who You Are

• You have 5+ years of software engineering experience with a track record of shipping production-ready products;
• You are fullstack — comfortable working with both backend and frontend;
• You have hands-on experience with AI in production (LLMs, ML models, or generative pipelines);
• You’ve built or integrated solutions using LLMs, LangChain, MCP, or similar tools;
• You actively use AI tools (e.g., Claude Code, Codex) to improve your development workflow;
• You understand AWS ecosystem and basic DevOps practices;
• You think in terms of product impact, not just implementation;
• You’ve worked in small, fast-moving teams, shipping frequently and iterating quickly;
• You’re independent, ambitious, and ownership-driven;

• You have Upper-Intermediate+ English.

   

Nice to Have

• Experience with video generation, diffusion models, or multimodal pipelines;

• Background in machine learning (fine-tuning, inference optimization, evaluation).

   

What You’ll Do

• Build and ship AI-powered features end-to-end;
• Work with LLMs, generative models, and ML pipelines as core tools;
• Use AI agents and tooling in your daily development workflow;
• Own features from idea to production, including monitoring and iteration;
• Collaborate with engineers to define API contracts and product behavior;

• Continuously improve architecture, performance, and product quality.

   

We offer:

You will be working with a professional and motivated team of enthusiasts in the environment that brings up the best in everyone. We have no bureaucracy, and we give our colleagues complete freedom to make decisions and achieve brilliant results.

Our company is built on the ability to find the best people and provide them with everything needed to stay focused on what’s important to make our users even healthier, sportier, happier and better! We create a business environment that brings up the best in everyone.

Competitive salary. Compensation that will help you focus on your projects and personal development.

Professional Growth. We offer a possibility to attend internal, external courses, seminars and access to a corporate library. You will be working with a team of professionals to get insights and discuss ideas.

Health&Fitness. We provide employees with 20 days of paid vacation, sick leaves and medical insurance.

Rest. We organize team buildings, parties and various team activities to boost our collaboration.

We're a boutique software company building custom ERP systems for clients across healthcare, food manufacturing, fintech, and e-commerce. Our solutions help businesses streamline complex processes — and we build them with care, using modern technologies and close collaboration with clients.

As we take on more projects at different stages, we're looking for a developer who can step into an active team, get up to speed quickly, and start making a real contribution early on. If you're someone who adapts well to new contexts — whether it's a different codebase, domain, or team dynamic — this could be a great fit.

Tech stack

• .NET Core
• EF Core
• MSSQL
• Angular
• DevExtreme
• Cloud platforms

Who we're looking for

• Solid hands-on experience with .NET Core and Angular (6 years of experience)
• Experience working on ERP or business management systems
• Ability to onboard quickly and contribute meaningfully from early on
• Good communication in English (B2 or above)
• Openness to working across different domains and teams

What we offer

• Fully remote with flexible schedule
• Long-term, stable engagement
• International, mostly Ukrainian team
• Minimal bureaucracy and management overhead
• Work on meaningful, production ERP systems in real industries

The company shapes the future of autonomous AI agents for developers. Work with AI engineers to build tools that enhance coding workflows, automate tasks, and boost productivity.

Why join us?

Be a part of the next AI-powered development tools redefining software engineering. Collaborate with top-tier engineers and AI specialists. Solve complex challenges in a fast-paced, growing company. Enjoy a fun work environment and exciting opportunities as we rapidly expand. Gain exposure to cutting-edge tech while we expand weekly.

• Be a part of the next AI-powered development tools redefining software engineering.
• Collaborate with top-tier engineers and AI specialists.
• Solve complex challenges in a fast-paced, growing company.
• Enjoy a fun work environment, and exciting opportunities as we rapidly expand.

• Gain exposure to cutting-edge tech while we expand weekly.

   

Our tech stack

React, TypeScript, Python, Postgres, Redis, AWS (leveraging its services extensively).

Responsibilities:

You’ll play a key role in designing and developing software, balancing backend and frontend development. Responsibilities include architecting scalable backend services, optimizing cloud-based solutions, and building interactive UI components and IDE plugins. Solve challenges like parsing large codebases, integrating AI assistants, and optimizing performance.

Requirements:

• 8+ years in full-stack engineering, with strong backend and frontend experience.
• Frontend: Deep expertise in React, TypeScript, and modern frontend architectures.
• At least 4 small fast growing customers / companies that he worked
• Experience with Python or NodeJS - MUST
• Hands on experience with AWS and cloud services
• Advantage: Use AI-powered dev tools in your day-to-day workflow.
• Advantage: Experience working with CI/CD pipelines, automated testing, and modern development workflows.
• Advantage: Experience with Infrastructure as Code (IAC) tools such as Terraform or Pulumi.

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

We power a proprietary, machine-learning-driven platform for programmatic user acquisition and retargeting in the mobile app space. The system processes tens of terabytes of raw data each day and generates millions of ad recommendations in real time. It handles millions of requests per second, delivering low-latency, high-throughput services that directly impact client growth and revenue.

Operating at this scale requires continuous innovation around distributed architecture, performance optimization, security and data protection. Our clients are major app developers seeking granular insights and measurable ROI, so robust engineering is critical to maintaining service quality and enabling rapid feature rollout under heavy load.

About the Role:

As Full Stack Team Lead, you will own the design, implementation and maintenance of our core real-time ad-serving infrastructure. You will rally a globally distributed team of four engineers behind a shared vision, drive technical direction and ensure high performance, availability and security. This role demands a hands-on leader who spends roughly half their time coding, reviewing designs and guiding end-to-end project delivery, and half their time on team management, sprint planning and stakeholder collaboration.

You will work closely with Executive, Product, Data and Design teams to define optimal solutions, integrate third-party APIs, and shape the roadmap for scalable growth. Your contributions will directly affect system reliability, client satisfaction and the company’s ability to scale into new markets.

Key Responsibilities:

• Design, implement and operate large-scale, highly available, real-time (low-latency) services using Node.js, TypeScript, React, Redis and Kubernetes on AWS.
• Lead and mentor a team of four distributed engineers; conduct code reviews, design reviews and knowledge-sharing sessions.
• Collaborate with executives, product managers, data scientists and designers to translate requirements into technical solutions.
• Design, develop and integrate RESTful APIs and third-party services.
• Plan, groom and manage agile sprint cycles; track progress and adjust priorities to meet delivery goals.
• Define and enforce security best practices and data protection policies across services.
• Oversee on-call rotation and incident response; maintain low alert rates and rapid recovery processes.
• Manage team operations including onboarding, offboarding, performance reviews and hiring support.

Required Competence and Skills:

• 6+ years of professional experience in backend (Node.js preferred) and frontend development (React, Vue or Angular).
• 2+ years in a people-management or team-lead role, with direct experience conducting one-on-ones and performance reviews.
• Hands-on experience with Kubernetes 
• Proficiency with SQL and NoSQL databases in production environments.
• Experience deploying and operating services on a major cloud platform (AWS, Google Cloud or Azure).
• Deep understanding of the software development lifecycle and agile methodologies.
• Strong problem-solving skills, self-sufficiency and a proactive “can-do” attitude.
• Fluent English communication skills, both written and verbal.

Nice to Have:

• Experience coordinating with offshore development teams.
• Background in web-based SaaS platforms.
• Exposure to large-scale data processing or Big Data technologies.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

About project

The product is redefining post-acute care by replacing fragmented, manual workflows with intelligent AI-driven automation. We help healthcare providers manage patients, not paperwork, by delivering robust throughput and intelligence across clinical, financial, and compliance operations. We are built by experts from Stanford Medicine, UCLA Health, and Amazon.

The Role: 

We are looking for a product-focused Full-Stack Engineer to join our team. You will be a key player in building our system, which involves developing sophisticated APIs that interface with Electronic Medical Records (EMR) and building advanced web-scraping tools for healthcare referral platforms.

This isn't just a coding role; we are looking for an engineer who understands the "Why" behind the "What." You will work in a high-efficiency environment where AI tools (Cursor, Gemini, Claude Code) are part of the daily workflow to maximize output and quality.

Technical Stack

• Frontend: React (Proficient)
• Backend: Go (Primary/Preferred) or Node.js
• Languages: TypeScript (Strongly Preferred)
• Workflows & Scraping: Playwright, Temporal (Airflow experience is a plus)
• Data: EMR website scraping, PDF parsing, and data point extraction
• Architecture: System Design focus; Cloud-native development

What You’ll Do

• Automate Workflows: Design systems that remove data access bottlenecks and automate clinical data entry.
• Build the "Injection Track": Develop and maintain APIs that reliably scrape and sync data from EMRs and referral platforms in real-time.
• Collaborate via Design: Participate in "1s design discussions" to align on architecture before implementation.
• Leverage AI: Use modern AI-assisted development tools (Cursor, Claude Code, LLM wrappers) to build faster and smarter.
• Take Ownership: Move beyond task execution to ownership—meaning you don't just follow instructions; you understand the business context and ensure the solution fits the need.

What We’re Looking For

• 3+ years of experience: You have a solid foundation in full-stack development and have worked on product-level code.
• Communication & Alignment: You understand that "going away and building the wrong thing" is a failure. You prioritize constant "connect" and alignment with the team.
• Problem Solvers: You are comfortable with the "messy" side of data—parsing PDFs, scraping complex websites, and ensuring data reliability.
• AI-Forward: You are already using AI coding tools to 2x your productivity.

Our Culture & Philosophy

• Context is King: We provide clear business requirements and motivation. We expect you to understand the "Why" to build better "Whats."
• Execution Levels: We expect our engineers to operate at an "I do" level—owning the solution from design to deployment.
• Efficient Growth: We value unique perspectives and a proactive work ethic.

We Offer:

• Medical Insurance in Ukraine and Multisport program in Poland.
• Offices in Ukraine (Kyiv, Kharkiv) and Poland (Wroclaw) or Remote.
• Paid vacation, sick leaves, and official holidays.
• Legal & Accounting services.
• The company provides all necessary equipment.
• English classes and Education reimbursement.

What we're looking for
We’re looking for a Full Stack Engineer who enjoys building real-time, interactive systems that
go beyond traditional web applications.
This is not a typical CRUD-focused role. You’ll be working on a product that combines rendering, input systems, video, and backend services into a single performance-sensitive
experience.

You should be comfortable operating in a fast-moving startup environment where requirements evolve quickly. We value engineers who take ownership, think creatively, and are comfortable
solving problems without fully defined specifications.

Who we are
we are venture-backed startup building patented technology that enables anyone to turn video into interactive games instantly, with no code.
We are creating a new category of interactive gaming content, combining real-time rendering, video, and game mechanics across mobile and web.

What you'll do You’ll work across the full stack, building both frontend interactive systems and backend
services that power them.
You’ll be responsible for optimizing the browser-side rendering and interaction layer, working with the DOM, Canvas 2D, WebGL, and browser APIs, and interfacing with our WebAssembly-based game engine.

On the backend and platform side:
● Design and build scalable Node.js services and APIs
● Model and manage data in MongoDB for real-time and user-generated content systems
● Develop systems that support gameplay state, media, and interactive features
● Ensure reliable communication between frontend systems and backend services
● Contribute to system architecture, performance optimization, and scalability decisions

On the frontend and rendering side:
● Collaborate with cross-platform engineers to integrate our WebAssembly-based game
engine into the browser environment
● Build video playback integrations that synchronize tightly with a real-time game loop
● Implement input handling systems such as touch, pointer events, and device orientation
with low-latency feedback
● Optimizing a high-performance rendering pipeline using Canvas 2D and WebGL to
achieve consistent performance and smooth frame rates on mobile browsers

Across the stack:
● Write unit, integration, and browser-based tests to ensure reliability
● Contribute to technical documentation and internal tooling
● Work closely with product, design, and engineering teams to ship features end-to-end

Core requirements
● Strong experience with Node.js, React, and MongoDB
● Solid JavaScript or TypeScript fundamentals
● Understanding of browser performance, including render loops, repaint behavior,
memory usage, and input latency

Nice to have
● Experience with Kotlin Multiplatform and WebAssembly
● Experience with Canvas 2D and WebGL in production or advanced projects
● Experience with game development or real-time interactive systems
● Experience with graphics, animation systems, or media-heavy applications
 

Client Overview

Our client is a global UK-based financial services and investment banking organization developing an AI-powered document processing and automation platform used across multiple business units. The platform focuses on large-scale data processing, workflow automation, integration with internal systems, and delivering modern digital capabilities for the wider banking group.

Position Overview

We are looking for a Senior Full-Stack Engineer to join a cross-functional engineering team building core components of the AI-driven document processing platform. This position requires strong backend engineering experience with Python as well as solid front-end or full-stack proficiency with TypeScript (preferably React, Next.js, or similar frameworks).
You will work on delivering scalable APIs, microservices, data workflows, and UI components that power document automation features, internal tools, and operational dashboards. The role involves close collaboration with product, architecture, GenAI, and platform engineering teams.
This role is ideal for someone who is hands-on, highly technical, and comfortable designing, developing, and deploying production-grade systems in cloud environments (preferably Google Cloud).

Key Responsibilities

• Design, develop, and maintain backend services using Python (FastAPI, Flask, Django, or similar frameworks).
• Build front-end components and UIs using TypeScript (React, Next.js, or similar frameworks).
• Develop and integrate REST APIs and microservices, ensuring strong performance, reliability, and observability.
• Collaborate closely with GenAI engineers to integrate AI-driven features and document-processing flows.
• Implement data processing pipelines for structured and unstructured data.
• Work with Google Cloud Platform services such as Cloud Run, Cloud Functions, Pub/Sub, and Cloud Storage.
• Contribute to the platform’s architecture, design patterns, and technical decision-making.
• Write automated tests and ensure a high level of code quality, maintainability, and security.
• Partner with product managers, designers, and QA engineers to deliver high-quality solutions on time.
• Document code, service interfaces, workflows, and architectural decisions.

Requirements

• 6+ years of professional software engineering experience, with significant work in both backend and full-stack roles.
• Strong proficiency in Python (FastAPI, Flask, Django, or similar).
• Solid experience with TypeScript and modern front-end frameworks (React, Next.js, or similar).
• Hands-on experience designing and implementing microservices, APIs, and backend systems.
• Strong understanding of databases: relational (PostgreSQL, MySQL) and/or NoSQL (MongoDB, Firestore).
• Experience with any cloud providers (AWS/Azure).
• Familiarity with CI/CD pipelines, Docker, Git, and modern DevOps practices.
• Strong understanding of software engineering principles: scalability, reliability, performance, and security.
• Experience working in agile, cross-functional teams on complex products.
• Excellent communication skills and ability to work with both technical and non-technical stakeholders.

Nice to Have

• Experience working with AI/ML or GenAI-driven systems.
• Experience with Google Cloud Platform 
• Familiarity with Vertex AI, Gemini, or integration with LLM-powered services.
• Experience with WebSockets, event-driven architectures, or Pub/Sub.
• Knowledge of authentication/authorization standards (OAuth2, JWT, IAM).
• Experience with document processing, OCR, or workflow automation.

We offer*:

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

*not applicable for freelancers

About the Project

We are building and scaling several internal platforms and infrastructure systems, including a proprietary CMS, publishing infrastructure, and a custom CI/CD platform. Instead of relying on typical off-the-shelf solutions, our systems are designed with a heavily tailored architecture focused on performance, scalability, asynchronous processing, and operational flexibility.

Key Responsibilities

End-to-end platform development

Architect, implement, and support new functionality across the stack using TypeScript, Node.js (Express), and React.

Platform & publishing infrastructure

Develop and improve our custom publishing and live preview systems, including work with Server-Sent Events (SSE), asynchronous workflows, Redis caching, and HTML processing/sanitization pipelines.

Performance & architecture optimization

Identify bottlenecks, optimize application performance, and contribute to the evolution of internal architecture, infrastructure tooling, backend services, and deployment workflows.

Frontend systems & editor functionality

Enhance our in-house React-based builder and rich-text editor by implementing new components, shortcodes, draft/publish workflows, and complex frontend state synchronization.

State handling

Work with complex, high-frequency frontend state using Redux Toolkit, RTK Query, and Shared Web Workers for cross-tab synchronization.

Tech Stack

Languages: TypeScript, Node.js (v22+)

Frontend: React (v18), Redux Toolkit & RTK Query

Backend: Express.js, JWT-based authentication

Data & caching: PostgreSQL (pg-native), Redis (ioredis), internally developed ORM/cache layer with code generation

Infrastructure & Tooling: AWS, Parcel, Playwright, ESLint, Prettier, CI/CD automation

What We’re Looking For

Strong Node.js & TypeScript expertise

Deep understanding of asynchronous systems, event loop behavior, memory management, garbage collection, and backend performance optimization.

Advanced React experience

Strong experience with React hooks, rendering optimization, and complex frontend state management.

Systems & architecture mindset

Comfortable working beyond standard frameworks (e.g., avoiding typical off-the-shelf solutions like Next.js/Prisma) and contributing to custom architectures, distributed workflows, caching strategies, IPC-based services, and performance-sensitive systems.

Ownership mentality

Proactively identify bottlenecks, suggest improvements, and take responsibility for delivering features from idea to production and monitoring.

High autonomy

Ability to operate independently, handle unclear requirements, and navigate complex or undocumented codebases.