Jobs Fullstack

We’re expanding our engineering team and looking for developers who are comfortable building production-grade React and Node.js applications for early-stage companies in healthcare, fintech, and AI.

Although the role is primarily front-end oriented, the ability to contribute to backend services in Node.js is important.

You’ll join a team with clear processes, a modern stack, and a strong engineering culture.

What you will do

• Create web applications using React and related tools.
• Develop and support backend services and APIs with Node.js (Nest.js or similar frameworks).
• Work with cloud platforms and container tools such as Docker, Kubernetes, AWS, or GCP.
• Join architecture discussions, suggest improvements, and help maintain high code standards.
• Collaborate with the client’s team on project tasks in English.

What we expect

• Strong understanding of JavaScript (ES6+) and TypeScript.
• Solid hands-on experience with React.
• Strong knowledge Node.js and frameworks like Nest.js or Express.
• Experience building APIs with Node.js-based frameworks.
• Understanding of relational and NoSQL databases such as Postgres, MongoDB, Firebase, or Supabase.
• Ability to write clean, maintainable code following best practices.
• English level: Upper-Intermediate (B2) or higher.

Additional advantages

• Experience working with major cloud providers such as AWS or Google Cloud.
• Experience with React Native.
• Solid understanding of Docker and Kubernetes.
• Familiarity with CI/CD pipelines (GitHub Actions, GitLab CI, CircleCI).
• Practical experience working with AI/LLM integrations in projects.

What we offer

• Engaging projects built with a modern, well-supported tech stack.
• A review process that ensures consistent feedback and knowledge sharing.
• A culture focused on continuous learning and professional development.
• Full remote work with a team distributed across multiple countries.
• Competitive compensation in USD with periodic performance reviews.
• Flexible payment methods tailored to your location.
• Work schedule aligned with your time zone.
• English practice sessions.
• Paid sick leave and annual vacation (15 business days).
• Regular team activities online.
• Coverage of monthly psychologist support sessions.

Full-Stack Developer at FlashProxy

Remote, full-time. Ideally someone in Eastern Europe who can work hours that overlap with GMT+3.

FlashProxy sells proxy and IP infrastructure on subscription. Small team, so you'd work directly with the founders and actually own your work instead of pushing it through endless approvals.

We need a full-stack dev to handle the software side: our website, our APIs, and the internal dashboards the team runs on. Long-term and full-time, not a short contract.

What you'll do

• Build and maintain our website
• Design and extend our APIs
• Build internal dashboards and tools for the team
• Own features start to finish, not just code someone hands you

What we need

• A few years of solid full-stack experience, strong on both front and back end
• Good with API design and databases
• Someone who can run with things on their own and cares about doing them right
• Fluent English, since you'll be talking to us daily

Stack (roughly): TypeScript, React/Next.js, Node, Postgres, Supabase. You don't need all of it if you pick things up fast.

Later on there's room to get into the infrastructure side, the networking that actually runs the product, and to start helping clients with the technical stuff. Something to grow into, not a requirement now.

To apply: send a short intro, your GitHub or examples of what you've built, and the rate you're after.

A potential invitation to potential minds!

4K-Soft is People. People are most important to us. People are at the heart of every connection we build. Come and join 4K-Soft, where human minds come together to pave the way for the future. We offer a variety of full-time jobs, training programs and internships. Only imagine, how you can help our company and start your career with 4K-Soft!

We are looking for a Strong Junior FullStack Web Developer.

What we expect from you:

2+- years of commercial experience:
 

• Node.js
• React
• PostgreSQL

We offer:
 

Competitive level of remuneration

Modern comfortable office or remote work

Convenient work schedule, paid vacation and sick leaves

The opportunity to grow professionally by participating in the implementation of interesting and complex projects, as well as showing personal initiative.

RAYTON is a leading Ukrainian energy engineering group specializing in commercial solar power plants and Battery Energy Storage Systems (BESS). We design and deliver turnkey energy solutions that help businesses achieve energy independence across Ukraine, Europe, the United States, and the Middle East.

With over 2,500 completed projects, RAYTON has established a strong track record of delivering energy solutions for major companies, including OKKO, KyivGuma, and Velmart, using Tier-1 equipment.

As we continue to expand our energy solutions and energy storage business, we are looking for a Full-Stack Developer (Middle Strong) to join our team and contribute to the development of software solutions supporting our technical and business operations.

About the Role

Mandatory

Proven commercial experience working in a manufacturing or industrial company is required. Candidates must have practical experience in a production environment, ideally involving industrial equipment, manufacturing processes, equipment monitoring, or production data analytics

We are developing an internal web platform for real-time monitoring and data analytics, with IoT integrations and a high volume of time-series data.

This is an engineering-oriented role: most of the work involves calculations, data processing and equipment configuration logic rather than typical CRUD or e-commerce features.

Key Responsibilities

— Develop and maintain backend services and APIs using Python and FastAPI (async).

— Implement calculation and optimization logic based on technical specifications with formulas, constraints and acceptance test cases.

— Process and validate time-series data from equipment (gaps, duplicates, units, time zones).

— Develop configuration and settings management for equipment parameters, with validation and audit trail.

— Build and improve frontend applications using React and TypeScript, including dashboards and time-series charts.

— Work with relational databases: data modeling, query optimization on large tables, and schema migrations.

— Implement real-time features using MQTT and WebSockets.

— Verify calculation results against reference data and cover them with regression tests.

— Work closely with engineers to translate technical requirements into reliable code.

Preference will be given to candidates with experience in Industrial IoT, SCADA/monitoring systems or industrial automation.

Requirements

3+ years of commercial experience with Python; solid experience with FastAPI.

— Experience implementing calculation-heavy or algorithmic business logic (not only CRUD).

— Ability to read technical specifications with formulas and turn them into tested code.

— Attention to numerical correctness: units of measurement, rounding, precision, edge cases.

— Strong SQL skills and practical experience with SQLAlchemy; MySQL/MariaDB preferred.

— Experience optimizing queries on large datasets (tens of millions of rows).

— Experience processing and validating time-series data.

— Experience handling dates and time zones correctly (UTC storage, local time display, daylight saving time transitions).

— 2+ years of experience with React and TypeScript.

— Experience with Docker and Linux environments.

— Knowledge of MQTT and WebSockets.

— Responsible approach to production systems: safe migrations, environment separation, secrets management.

— Good English for technical documentation and code.

— Strong problem-solving skills and ability to work independently.

Who we are

FansCreator (fanscreator.ai) is an unrestricted AI image and video generation platform. Today our main customers are creators and agencies, but the platform isn't limited to them. We're profitable, growing 30% month over month, and our founders have sold three businesses for seven figures and more.

The work

We're hiring a senior full-stack engineer to become the main person who knows the system end to end. You'll build customer features from 0 to 1 in Python (FastAPI) and TypeScript (React). You'll also harden payments, security and compliance.

What you'll do

• Build customer features from 0 to 1 in Python, TypeScript and React, and keep them working in production. Make the data accurate and the interface clear.
• Investigate production problems using logs, metrics and the actual request and job flow. Identify who is affected, contain the problem and verify the fix.
• Keep payments correct: payment orchestration, checkout, recurring charges, payment webhooks, refunds and chargebacks.
• Keep AI render jobs reliable. Handle retries, duplicate events, slow providers and worker failures without losing data or letting one account hold up everyone else.
• Harden security: separation between workspaces, roles and permissions, webhook signatures. Protect our APIs against abuse.
• Improve database queries, worker capacity and scheduling based on measurements. Add tests for the failures we cannot afford to repeat.
• Challenge a decision when you think we're solving the wrong problem. Explain the alternative and its tradeoffs.

Security issues, payment errors and incorrect customer data take priority. We agree with the team which product work comes next.

What we need from you

• You have 3+ years shipping and maintaining Python applications (FastAPI or Django) with real users, and you're comfortable building in TypeScript and React.
• You have operated queue or worker systems in production. You understand concurrency, retries, duplicate execution, backpressure and how databases and external services limit throughput.
• You have built payment integrations: payment orchestration, hosted checkout, recurring charges, webhooks, refunds and chargebacks.
• You can describe a production incident you personally investigated, the evidence that led to the cause and how you proved the fix worked.
• You check that data means what the product says it means. Missing information, failed requests and legitimate zero values need different handling.
• You use AI regularly and can show how it improves your work. You verify its output and understand the code you ship.
• You investigate problems independently, keep the team informed and raise blockers early. You know when to involve someone else in a decision.
• Strongly preferred: hands-on production work with generative image and video APIs: async render jobs, LoRA fine-tuning, video processing with ffmpeg.

• Preferred: production experience with generative image/video APIs and the checks around them (moderation, face verification, output quality).

   

Your own projects count as much as years. A product you built and shipped yourself tells us as much as time in a job.

Nice to have

Published SDKs, OpenAPI, MCP tools, security testing, PostHog, experience with creator platforms or comfort with the adult creator industry. Public code is welcome; confidential commercial work also counts if you can explain your contribution.

How we work

We're a small team. We work asynchronously and review progress weekly. Keep the team informed about decisions, blockers and incidents. We care about work reaching customers and continuing to work after release.

We will discuss working-hour overlap, incident coverage, response expectations and any on-call arrangement before an offer.

How we hire

A debugging exercise, a 30-minute technical walkthrough, then a decision. You have six-seven 🤷‍♂️ hours, including setup. The process usually takes under two weeks. You can use AI throughout; we'll ask you to explain your code and decisions.

About Us

Smirnov Labs is a fast-growing engineering company founded by an ex-Googler. We help product teams launch and scale quickly by leveraging modern technology and AI-assisted development.

Our projects are diverse — we partner with clients at the earliest stages and own the technical delivery end-to-end.

We're a small, senior-heavy team where every engineer has real impact. No bureaucracy, no hand-holding — just sharp people shipping fast.

This is an outstaff role: you'll be embedded directly with a client's engineering team as part of our delivery group.

The Role

Our client is a US healthtech startup whose AI platform helps dental patients understand, finance and book the treatment their dentist recommended. The product is live with dozens of practices and handles patient health data every day. The team is small, and the technical founder reviews every pull request.

The platform includes an AI treatment coordinator that answers patients' questions about their care, in text and voice. It's built and has been through several iterations, but it isn't in production yet — healthcare demands a higher bar. Your job is to get it there: build the evaluation harness, tune context and guardrails until the answers are safe and useful, then ship it. Next come agentic workflows, starting with booking appointments end-to-end. The agent runs in Python on Google ADK and Gemini; the product around it is TypeScript and Node.js, and you'll work across both.

What You'll Do

• Own the patient-facing AI assistant end-to-end — prompt and retrieval design, deployment, and monitoring in production.
• Build the eval harness: test sets from real patient questions, with automated scoring for safety, accuracy, resolution, number of turns, token cost and latency.
• Design guardrails for a healthcare setting: what the assistant may answer, what it must hand to a human, and how it treats sensitive data.
• Improve context passing — the patient's treatment plan, costs, insurance and history — so the model answers from facts, not guesses.
• Build agentic flows, starting with appointment booking against practice systems.
• Work across the stack: Python agent services, TypeScript/Node.js backend, React frontend, Postgres.
• Instrument LLM calls with logs, traces and metrics so regressions show up before patients see them.
• Work directly with the client's founder in a daily standup. No layers in between.

• Use AI-assisted development tools (Claude Code, Cursor, GitHub Copilot) as part of your daily workflow.

   

What We're Looking For

• 5+ years of production software engineering, including LLM-powered features shipped to real users
• Python and TypeScript/Node.js in production
• Hands-on evaluation work: you've built eval sets and harnesses and used them to make launch decisions
• RAG and context engineering: embeddings, retrieval, prompt design, tool use
• Guardrails and failure handling for LLM output — you know how these systems fail and how to catch it
• Production experience with at least one major LLM stack (Gemini/Google ADK, OpenAI, Anthropic), and the judgement to swap models when it pays
• Working Postgres and React — enough to ship a complete feature alone
• A track record of shipping without a detailed spec and without process handed to you
• Working US Eastern hours (required): daily 10:00 ET standup and availability through the client's working day
• Upper-Intermediate or higher English — you'll talk to a US founder every day

• Ability to own and drive features independently with minimal supervision

   

Nice to have

• LLM work in healthcare or another regulated domain (insurance, finance, legal)
• Voice agents: speech-to-text, text-to-speech, telephony
• Handling sensitive personal or health data in LLM pipelines: redaction, access control, audit trails
• Google Cloud: Cloud Run, Vertex AI

• Early-stage or agency background: greenfield work, shifting requirements, direct client contact

   

What We Offer

• Competitive salary above market average
• Fully remote work
• Flat structure — work directly with the client's founder and engineering team, no middle management
• Real technical ownership: you make the architecture decisions on the systems you build
• Diverse and technically challenging projects
• Modern AI-powered development workflow
• Small team culture — your voice matters, your code ships
• Paid vacation and sick leave
• Flexible schedule within the US timezone overlap
• Professional and career growth through real ownership, not courses and certificates

Full Stack Developer (React/TypeScript/Go/Python)
 

Rate: Up to $20/hour
 

Frontend Tech Stack

• React 19 with TypeScript (strict mode), using Vite as the build tool.
• Tailwind CSS v4.
• shadcn/ui ("new-york" style with CSS variables), based on Radix primitives and Lucide icons.
• TanStack Router for navigation, TanStack Query for server-state management, and Zod for data validation.
• assistant-ui and Streamdown for building chat interfaces and streaming UI functionality.
• Testing tools: Vitest and Testing Library for unit tests, Playwright for end-to-end testing.
• Development tooling: pnpm, ESLint (including rules for enforcing import boundaries), and Prettier.
   

Backend

The backend is mainly developed in Go, with additional services written in Python.
 

Overall Technology Stack

Go, Python, PostgreSQL, Redis/Valkey, React 19 + TypeScript, GCP, Terraform, Docker, and Datadog.

Senior Full Stack Developer (Python/TypeScript)
 

English: B1+
Rate: Up to $20/hour
Employment: Full-time
Duration: 6-8 months
Start: In 2-3 weeks
 

About the Project

A rapidly growing SaaS startup focused on transforming the professional services sector through AI-driven software that streamlines complex workflows involving documents, search, and matter management.
 

Responsibilities

• Take independent technical ownership of complex product and infrastructure features, from architecture and design through deployment.
• Develop and improve AI-powered workflows, including LLM agents, document processing, and tool calling.
• Architect reliable backend services, APIs, data flows, queues, and integrations with third-party systems.
• Investigate and troubleshoot complex production issues across the full stack using logs and tracing.
• Leverage AI development tools such as Claude Code, Cursor, and Codex in daily work to improve engineering efficiency and delivery speed.
   

Requirements

• 7+ years of commercial software engineering experience.
• Strong knowledge of Python with FastAPI (or comparable frameworks) and TypeScript with React.
• Advanced SQL skills and experience designing database schemas, ideally with PostgreSQL.
• Solid understanding of cloud platforms (Azure, AWS, or GCP), Docker, and CI/CD workflows.
• Strong architectural expertise in building reliable asynchronous systems, APIs, workers, and queues.
• Practical experience implementing and maintaining production LLM functionality, agents, prompt workflows, and RAG/search solutions.
• Hands-on experience with monitoring, metrics, observability, and tracing tools such as Datadog, PostHog, Langfuse, and OpenTelemetry.
• Demonstrated ability to independently deliver production-ready solutions from start to finish.

Are you passionate about technology and eager to kickstart your career in software development? Join our dynamic team at DICEUS as an Intern Full Stack Developer and gain hands-on experience in a professional tech environment.

You’ll be contributing to the development of a modern solution tailored for the insurance industry - designed to optimize operations and enhance customer engagement through advanced technologies like cloud computing and AI.

What You’ll Be Doing:

• Assisting in the development of scalable web applications (both front-end and back-end) under the guidance of experienced mentors.
• Learning and working with back-end technologies such as .NET (C#) and front-end frameworks like Angular.
• Building responsive user interfaces with Angular and integrating them with back-end APIs.
• Exploring Azure Cloud and understanding how modern apps are deployed and maintained.
• Supporting the implementation of API integrations and other software components.
• Engaging in internal team discussions and learning sessions to broaden your knowledge base.

What We Expect From You:

• Basic understanding of programming concepts in .NET (C#) and front-end fundamentals (HTML, CSS, JavaScript/TypeScript).
• Familiarity with or strong interest in Angular (or other modern front-end frameworks).
• Curiosity about cloud services, web technologies, and how real-world systems work end-to-end.
• Willingness to learn, grow, and take feedback constructively.
• Good communication and team collaboration skills.
• Currently studying or recently graduated in Computer Science or a related field.

What We Offer:

• Hands-on experience with cutting-edge technologies in a professional environment.
• Mentorship and guidance from experienced developers.
• Exposure to real-world full stack development processes in the insurance tech space.
• A collaborative and innovative work culture that encourages learning and growth.
• The opportunity to become a Junior Full Stack Developer after successfully completing the internship period.

Sounds like your kind of challenge? Apply now and let’s start your tech journey together!

Who we are

Vista Auction is an online auction for returned and overstock goods. Items go up for auction in our mobile app, people bid, and winners pick up at our warehouses near Charlotte, North Carolina.

We serve more than 55,000 customers a month, sell over 25,000 items a day, and take more than 7 million bids a month. And we're just getting started!

We run our own warehouses and build our own technology, so everything a customer experiences, from the first bid to the pickup counter, is ours to make better.

The Platform Team

The Platform Team is a group of engineers and product people across the US and Europe that owns the whole Vista Auction platform: the mobile app and website, the auction engine, the warehouse and pickup systems, and the internal tools and AI agents. 

It is led by our Head of Engineering, who works directly with the founder. An idea can ship and be measured in days.

You will join the team as a fullstack developer. You are responsible for the API and the app. The same person who writes the endpoint ships the screen.

The team is universal. Engineers pick up each other's work across the warehouse API, the warehouse app, and the customer app, whichever part the release needs. You do the same. Stack on that work is Python and Django on the API, Kotlin on the warehouse app, and Flutter on the app customers use. You ship in small releases. 

AI is part of how this team builds: you are expected to use it every day and to know when the output is ready to merge.

What You'll Do

• Own the feature on both sides.
• Turn a product idea into a release in days. Keep the change small enough to ship, watch the result, and follow with the next one.
• Use AI to move faster. 
• Pick up work another engineer started, and leave yours in a state someone else can finish. The team covers the API and both apps together.
• Leave the system clearer than you found it. Tests on the logic you add, and a change another engineer can review quickly.

What You'll Bring

Must have:

• Production experience with Python, Django, and Django REST Framework. You have designed endpoints, validation, and PostgreSQL queries yourself.
• Mobile experience in Kotlin (Android), Flutter, or both. You are ready to take the app side of a feature, on the warehouse app or the customer app, next to the API.
• Daily use of AI coding tools, with a clear sense of where they help and where they waste time. You review generated code before it ships.
• A habit of small, frequent releases. 
• About 3 to 5 years of commercial development.

• You work directly with engineers and product, and you write changes that are easy to review.

   

Nice to have:

• Celery on RabbitMQ, Redis, and Docker in a real deployment.
• React and TypeScript.

• A mobile release process you have run yourself: build, test, ship.

   

What we offer

• You are responsible for the API and the app. A small universal team.
• Real customers, real numbers, fast.
• AI is part of the job, with the expectation that you use it well and stay responsible for what merges.
• Growth with the team.

We are looking for 🚀 Fullstack Engineer 🚀 who enjoys learning, building, and switching between projects.
 

💻 Responsibilities:
• Advanced backend and frontend development (TypeScript / Node.js / Next.js / React)
• Build and maintain GraphQL and REST APIs
• Integrate with third-party platforms (CRM, ERP, headless CMS, search, auth, marketing)
• Build serverless and event-driven workflows on AWS
• Mentor / coach other team members
• Code reviews and refactoring, with a focus on code quality and security
• Analyze and solve advanced problems in production
• Fix bugs, follow them up and find workarounds; spot pain points in the platform
• Own the performance and reliability of services in the cloud
• Write technical specifications and implementation plans when needed
• Automate and optimize repetitive tasks, including with AI agents
 

⚙️ Required skills:
• 3+ years of experience in JavaScript / TypeScript fullstack development (Node.js / Next.js / React)
• Skilled at building and consuming APIs: GraphQL (Apollo, Federation) and REST
• Comfortable building SSR/SSG/ISR web applications
• Solid SQL skills, including query optimization
• Experience with AWS (serverless, containers / Kubernetes, monitoring, CDN)
• Infrastructure as Code (Terraform or similar)
• Git workflows with multi-environment promotion and CI/CD pipelines
• Automated testing (unit and end-to-end)
• Good knowledge of accessibility (a11y), SEO best practices, semantic HTML and metadata
• Daily, hands-on use of AI coding tools
• Great analytical skills, adaptability and responsiveness
• Fluent in English
• Team player
 

🤖 AI tools we use:
• AI coding agents (Claude Code) and AI-assisted IDEs (Cursor)
• Shared, team-maintained agent skills and specialized subagents for everyday engineering tasks
• MCP integrations that connect AI agents to issue tracking, source control, team chat and observability tools
• Spec-driven development with AI (spec, then plan, then tasks)
• LLM-powered product features built on cloud AI services
• We expect engineers to use these tools well, help improve shared skills and prompts, and critically review AI-generated code.
 

⭐ Nice-to-have:
• Experience with CRM or ERP platform development (e.g. Salesforce, NetSuite)
• Experience with a headless CMS
• Experience with a hosted search engine (e.g. Algolia)
• React Native
• Vue / Nuxt
• C# / .NET
• Python and data platforms
• Tailwind CSS, UI libraries (Radix UI, Material UI)
• Observability tools (error tracking, log management, alerting)
• i18n in Next.js
 

🤝 Interview process:
1. Intro-call with the Recruiter.
2. Technical Interview.
3. Test Task
4. Client Interview.

💎 Benefits:
• Full remote work and meetings for brainstorming.
• Freedom and flexibility.
• A team of top experts and synergy of the entire organization.
• Competitive salary.
• Vacation and sick leaves.
• Therapy sessions with our psychologist.
• Budget for professional development.
• Corporate events and team building.

About Us

Smirnov Labs is a fast-growing engineering company founded by an ex-Googler. We help product teams launch and scale quickly by leveraging modern technology and AI-assisted development.

Our projects are diverse — we partner with clients at the earliest stages and own the technical delivery end-to-end.

We're a small, senior-heavy team where every engineer has real impact. No bureaucracy, no hand-holding — just sharp people shipping fast.

This is an outstaff role: you'll be embedded directly with a client's engineering team as part of our delivery group.

The Role
Our client is a US healthtech startup whose AI platform helps dental patients understand, finance and book the treatment their dentist recommended. The product is live with dozens of practices and handles patient health data every day. The team is small, and the technical founder reviews every pull request.

The patient-facing web app is the product. Your first major project is a full redesign of the patient treatment chart. There's no designer: you own the UX decisions, with the founder as your reviewer. You're still full-stack — you take every feature through the Node.js backend and Postgres, not just to the API boundary.

What You'll Do

• Own the patient-facing web app end-to-end — React, TypeScript and Tailwind on the front, Node.js and Postgres behind it.
• Lead the redesign of the patient treatment chart: work out what confuses patients, propose the design, build it, ship it.
• Make UX decisions without a designer, and back them with how patients actually use the product.
• Build mobile-first. Most patients open the app from a text message on their phone.
• Take every feature through the backend: APIs, data models, async jobs.
• Raise the frontend bar — component structure, typing, tests, accessibility — while migrating older JavaScript to TypeScript.
• Treat patient data with care. Privacy and security are part of the job, not an afterthought.
• Work directly with the client's founder in a daily standup. No layers in between.
• Use AI-assisted development tools (Claude Code, Cursor, GitHub Copilot) as part of your daily workflow.

What We're Looking For

• 5+ years building production web applications, with a large share of that on the frontend
• Deep React and TypeScript — you know how to structure a large app so it stays maintainable
• Tailwind CSS or a comparable design-system approach
• A strong product and UX eye: you've shipped interfaces people found easy to use, without a designer handing you specs
• Solid Node.js/TypeScript on the backend and working Postgres — enough to ship a complete feature alone
• Mobile-first, responsive web experience
• Comfort reading legacy JavaScript and refactoring it into typed TypeScript
• A track record of shipping without a detailed spec and without process handed to you
• Working US Eastern hours (required): daily 10:00 ET standup and availability through the client's working day
• Upper-Intermediate or higher English — you'll talk to a US founder every day
• Ability to own and drive features independently with minimal supervision

Nice to have

• Healthcare, patient-facing or other regulated consumer products
• Accessibility (WCAG) work you can point to
• Design systems and Figma — you can sketch before you build
• Capacitor or other web-to-mobile packaging
• Early-stage or agency background: greenfield work, shifting requirements, direct client contact

What We Offer

• Competitive salary above market average
• Fully remote work
• Flat structure — work directly with the client's founder and engineering team, no middle management
• Real technical ownership: you make the design and architecture decisions on what you build
• Diverse and technically challenging projects
• Modern AI-powered development workflow
• Small team culture — your voice matters, your code ships
• Paid vacation and sick leave
• Flexible schedule within the US timezone overlap
• Professional and career growth through real ownership, not courses and certificates

How to Apply
Send your CV with a brief note about an interface you redesigned — what was confusing users, what you changed, and how you knew it worked.

Mirko Solutions is an international IT company specializing in web and mobile development for clients in the US, Canada, EU, and Australia. We deliver high-quality digital solutions including web applications, mobile apps, cloud systems, and custom software for businesses worldwide.

Due to the rapid growth of our company, we are currently looking for an experienced Middle Fullstack Developer (Node.js + React) to join our team and work on a new international project in our Tallinn office.

Responsibilities:

• Develop and maintain scalable backend and frontend functionality
• Build and integrate REST APIs and third-party services
• Develop backend services using Node.js
• Build and maintain frontend applications using React
• Work with databases and complex business logic
• Investigate and fix production and integration-related issues
  Participate in code reviews and technical discussions
• Collaborate with QA, Team Leads, and other developers during feature delivery

Requirements:

• 3+ years of commercial software development experience
• Strong hands-on experience with Node.js
• Solid experience with React
• Good knowledge of TypeScript
• Experience designing and integrating REST APIs
• Experience with SQL and relational databases
• Experience with Git and Docker
• Understanding of CI/CD practices
• Good understanding of software development principles and best practices
• Good command of English
• Ability to work from our Tallinn office

We offer:

• Opportunity to work on an international project
• Professional growth and development
• Friendly and supportive team environment
• Collaboration with experienced international teams

We’re looking for an AI-forward Full-Stack Developer to help build a platform focused on international payments, crypto infrastructure, and blockchain integrations.

The platform connects third-party services, payment infrastructure providers such as Bridge, and blockchain-based systems. The product involves API integrations, stablecoin-related functionality, on-chain interactions, and reliable data processing.

We’re looking for someone passionate about developer platforms, experienced in integrating external APIs into real-world products, and enthusiastic about using Claude and other AI-powered tools to build software faster and more effectively.

Responsibilities

• Build and maintain full-stack applications using Node.js, TypeScript, React, and Next.js.
• Develop backend services and REST APIs using Express.js.
• Integrate third-party APIs for international payments, financial services, and crypto infrastructure.
• Work with providers such as Bridge and similar payment and stablecoin infrastructure services.
• Implement blockchain integrations, on-chain interactions, and crypto-related workflows.
• Design and maintain MongoDB schemas and data models.
• Build responsive frontend interfaces and connect them to backend services.
• Implement webhooks, asynchronous workflows, transaction status tracking, and error handling.
• Deploy, maintain, and monitor applications on AWS.
• Use Claude and other AI-powered development tools throughout the development lifecycle.
• Contribute to architecture decisions, code quality, and developer experience.

Requirements

• Strong experience with Node.js and TypeScript.
• Hands-on experience with React and Next.js.
• Experience building backend services and APIs with Express.js.
• Practical experience with MongoDB and database-driven applications.
• Experience integrating third-party APIs into production products.
• Familiarity with AWS and cloud-based application deployment.
• Understanding of REST APIs, webhooks, authentication, and asynchronous processing.
• Knowledge of crypto, blockchain fundamentals, and on-chain transactions.
• Experience using Claude or similar AI coding tools as part of everyday development.
• Ability to work independently, solve technical challenges, and deliver features end to end.

Nice to Have

• Experience with fintech, international payments, or cross-border payment systems.
• Previous integrations with Bridge or similar payment and crypto infrastructure providers.
• Experience with stablecoins, crypto wallets, blockchain APIs, or smart contracts.
• Familiarity with Ethereum and EVM-compatible networks.
• Experience with AWS services, background jobs, queues, and distributed systems.
• Experience building developer platforms, public APIs, or SDKs.

Who We’re Looking For

We’re looking for an AI-first engineer who actively uses Claude to research, implement, debug, and improve code while maintaining a strong understanding of the systems being built.

You’re passionate about developer platforms and enjoy making complex integrations simple and reliable. You can move comfortably between frontend and backend development, connect external services, and build practical solutions involving payment systems and blockchain infrastructure.

You value speed, ownership, and maintainable code over unnecessary complexity.

What We Offer

• The opportunity to build a product at the intersection of international payments, crypto, and blockchain.
• An AI-first development workflow using modern tools such as Claude.
• A lean team, direct communication, and ownership of technical decisions.
• The opportunity to work on real-world financial infrastructure and API integrations.

If you enjoy full-stack development, API-driven products, crypto infrastructure, and AI-assisted engineering, we’d love to hear from you.

CoreWillSoft GmbH is a German-based company working on secure IoT software solutions and services. The mission of CoreWillSoft is to help businesses protect their assets, employees, and data by providing advanced software solutions and services in the security industry. 

We are looking for a Full-Stack Software Engineer with strong backend experience in Kotlin/Java and either: 

• solid Frontend (React) expertise, or 
• experience in Kotlin Multiplatform / Android development 
   

You will work on products used by businesses across Western Europe and North America. 

Our team operates in a scaled agile approach across Europe with a headquarter in Bonn, Germany. It is responsible for the complete software development lifecycle; including ideation, implementation, and operation of the secure IoT software operating smart buildings and smart homes across the world. 

This is an exciting opportunity to work on cutting-edge projects involving high-security hardware and technology in a creative, international environment. 

We offer: 

• Meaningful Impact: Build solutions that are used every day by thousands of businesses your work will directly improve real-world security and connected device experiences.  
• Product & Process Ownership: Help shape not only the product, but also how we build and deliver it  your ideas and decisions will have visible impact.  
• Industry Influence: Contribute to key security standards and best practices, staying ahead of the curve in a fast-evolving industry.  
• Modern Tech Stack & Hardware: Work with the latest hardware and the tools you need to do your best work.  
• Time Off & Flexibility: Vacation days, paid sick leave, and public holidays in line with German legislation plus flexibility built around outcomes, not micromanagement.  
• Learning & Development Budget: We support continuous growth by covering hard and soft skills courses, trainings, and access to e-learning platforms.  
• Coworking Support: Prefer not to work from home every day? We offer coworking compensation so you can choose the environment that fits you best.  
• Language Learning Support: Monthly fixed compensation you can use to improve your English or German through the learning format of your choice.  
• Strong Team Culture: Open collaboration, a flat structure, and thoughtful onboarding your voice is heard, and you can make an impact from day one. 

Your skills: 

Backend: 

• Proficiency in Kotlin and/or Java for backend development.  
• Strong experience with Spring Boot framework.  
• Experience with Docker and containerized applications.  
• Familiarity with cloud platforms such as AWS, Azure, or Google Cloud.  
• Experience in designing and consuming RESTful APIs.  
• Knowledge of microservices architecture and patterns.  
• Experience with on-premise and cloud-based deployments.  
• Proficiency in secure coding practices and understanding of security best Ko practices for backend systems.  
• Familiarity with scalability strategies and performance optimization in backend services.  
• Knowledge of monitoring and observability tools (e.g., Prometheus, Grafana, ELK).  
• Knowledge of cryptography and security  
• Familiarity with CI/CD processes, including GitHub Actions, GitLab CI, or similar tools.  
• Experience with version control systems (e.g., Git).  

• Experience with database technologies, both relational (e.g., PostgreSQL) and NoSQL (e.g., MongoDB). 
  
  Frontend (one of the following paths is required) 

  Option 1 – Web Frontend: 

• Strong experience with React.js or Angular or Vue 
• Solid knowledge of TypeScript / JavaScript, HTML5, CSS3 
• Experience with modern tools (Vite, Webpack, npm, etc.) 

• Understanding of state management (e.g., Redux) 

  
  Option 2 – Mobile / Multiplatform: 

• Experience with Kotlin Multiplatform and/or Android development 
• Strong knowledge of Kotlin Coroutines and Flow 
• Experience with Jetpack Compose (or Compose Multiplatform) 
• Familiarity with dependency injection frameworks (e.g., Koin) 
• Experience with networking libraries such as Ktor

Nice to have: 

• Experience with Kotlin Multiplatform in production 
• Knowledge of modern Kotlin ecosystem (Coroutines, Flow, Compose, Koin, Ktor) 
• Knowledge of additional programming languages 
• Experience with system architecture and distributed systems 
• Understanding of UI/UX design and performance optimization 
• Knowledge of building automation or access control systems