Jobs Developers

Backend Developer (Rust) – 4connection Messenger Platform

THE 4CONNECTION PROJECT

4connection is a client-commissioned messenger platform combining secure group messaging, interest-based communities, and a serious dating and matching layer. The platform targets the DACH market with a planned launch in early 2027 and a clear commercial roadmap defined with the client, 4connection FlexKapG.

The backend is the proprietary core of the product. The clients (Android in Kotlin, iOS in Swift) will be released as open source. The backend remains closed source.

Architecture highlights:

• Three-layer architecture: Connection Gateway, Routing and Business Logic, Storage
• Cell-based horizontal scaling, approximately 500K users per autonomous cell
• Zero-knowledge server design: message content, keys, and sensitive metadata are not accessible to the server in plaintext
• Custom binary protocol with zero-copy deserialization, no JSON in hot paths
• Event-driven message routing over a NATS bus, no synchronous service waits
• Differentiated storage: Redis for hot state, ScyllaDB for cold history, S3-compatible object store for media

THE ROLE

You will work directly with the technical lead on the Rust backend. The architecture is defined, the stack is chosen, the client is committed, the first internal milestones are running. We are looking for an engineer who wants to take real ownership of significant backend subsystems and write code that will run in production for years.

This is not a Rust learning position. We expect you to be productive in Rust from week one and to bring opinions and experience to the table.

RESPONSIBILITIES

• Implementing backend subsystems in Rust against a clearly defined three-layer architecture
• Building and maintaining the WebSocket and HTTP connection layer (Axum, tokio-tungstenite)
• Implementing message routing and group fanout over NATS
• Implementing the persistence layer against Redis, ScyllaDB, and MinIO
• Implementing the custom binary protocol and zero-copy message handling (rkyv)
• Integrating push notification services (FCM, APNs) without compromising the zero-knowledge guarantees
• Close collaboration with the Android and iOS engineers on API and protocol design
• Writing testable, documented, idiomatic Rust that meets the standard of professional handover

REQUIRED QUALIFICATIONS

• 2+ years of practical Rust experience in non-trivial projects, professional or substantial personal work you can show us
• Solid systems programming background (Rust, C, C++, or comparable) and a real understanding of ownership, lifetimes, memory layout, and concurrency
• Working knowledge of async Rust and the Tokio ecosystem
• Solid network programming foundation: TCP/IP, TLS, WebSockets, HTTP
• Awareness of cryptographic principles relevant to end-to-end encrypted, zero-knowledge systems: key management, forward secrecy, authenticated encryption, secure key derivation. Practical experience is a strong plus.
• A serious commitment to clean, readable, maintainable code. This is non-negotiable.
• Confident with Git and Linux as a daily working environment
• English at B1 or better, written and spoken

DESIRABLE QUALIFICATIONS

• Production experience with Axum, Actix-Web, or comparable Rust web frameworks
• Experience with high-throughput WebSocket systems (tokio-tungstenite, fastwebsockets)
• Experience with zero-copy serialization (rkyv, Cap'n Proto, FlatBuffers) or designing custom binary protocols
• Experience with NATS, Kafka, or comparable message buses
• Experience with wide-column or distributed databases (ScyllaDB, Cassandra)
• Experience with S3-compatible object storage
• Familiarity with FCM and APNs integration
• Familiarity with secure messaging protocols such as Signal Protocol, Double Ratchet, X3DH, or MLS (RFC 9420)

TECHNOLOGY STACK

Rust, Tokio, Axum, tokio-tungstenite, rustls, rkyv, async-nats, Redis, ScyllaDB, MinIO, FCM, APNs, Linux, Git, Open Project, Nextcloud.

HOW WE WORK WITH AI

Claude is used as a language model in our development workflow, as a sparring partner for architecture discussions, code review, and documentation. Claude does not have file system access to our codebase, no agent integration, no automated commits. Source code remains exclusively under the control of the development team. We expect a professional, critical handling of AI tooling. It accelerates thinking, it does not replace engineering judgement.

WHAT WE OFFER

• Fully remote position with long-term collaboration perspective
• Direct mentorship from a technical lead with over four decades of professional software development experience
• A small, focused team without corporate overhead or management layers
• Open-source collaboration tooling (Open Project, Nextcloud)
• Visible work on the open-source client repositories
• Fair compensation aligned with seniority and responsibility

ABOUT WE wilke experience

At WE, we are more than just a service provider, we are a strategic partner. Our more than 40 years of experience in software development and the use of state-of-the-art software-supported processes guarantee the flexible and promising implementation of our projects.

The result of over four decades of experience is an in-depth knowledge of the industry, which enables us to always be at the cutting edge of technology. We are a reliable partner for the development of customized software solutions. We support our customers in turning their visions into reality.

You will always have a dedicated contact person at your side to provide you with advice and support.

With our innovative collaboration tool, WE Gate, we make communication and collaboration simple, transparent and truly agile.

Among other things, we work with collaboration tools, ticket systems, chats, Git, TeamCity, shared documents and further support for remote collaboration.

Company website: https://wilke-experience.de/

stay creative

We are looking for a Senior Full Stack Developer who operates at Tech Lead level.

This role focuses on architecture ownership, technical decision-making, and team leadership in complex e-commerce and SaaS products.

Format: Remote (candidates located in Ukraine or Europe)
Company: 3DVisual Studio
Company type: Product
Salary: up to 5000$ gross
English level: B2+

Core Requirements & Tech Stack

• 5+ years of commercial experience with PHP (Laravel)
• 3+ years of experience with React
• Experience with Magento / Shopware / WooCommerce (at least 2 years)
• 2+ years in a Lead / Tech Lead role
• Strong experience in system architecture design
• Experience with high-load / scalable systems
• Strong knowledge of APIs, performance, and security
• Experience with legacy code and refactoring

Responsibilities

• Analyze and improve system architecture (includes creation of diagrams and documentation)
• Make and validate technical decisions
• Lead developers and ensure delivery quality
• Conduct code reviews and enforce best practices
• Communicate with stakeholders and third-party integrations

Projects We build:

• SaaS platforms
• 3D configurators
• E-commerce solutions

👉 Complex logic, integrations, and performance-critical systems

Company Benefits

• Cooperation via FOP Accounting support provided by the company (if needed)

For full-time cooperation:

• 15 days of paid vacation
• 5 paid sick days
• Paid public holidays
  
  Interview Process

HR Interview→Technical Interview→ Deep Technical / Architecture Interview→ Final Interview

Important
We are looking for a technical leader with an ownership mindset who can effectively collaborate with team members.

We are looking for a Middle Full-Stack Software Engineer with hands-on experience in TypeScript, React/Next.js, and practical experience working with Python-based backend services.

The ideal candidate is comfortable owning features end to end — from frontend implementation and user-facing flows to backend services, APIs, integrations, and production support. 

This role is a good fit for an engineer who enjoys working across the stack, solving complex integration challenges, and contributing to a product in the AI communication space. 

The position is slightly frontend-leaning, but still requires the ability to read, write, and maintain backend services. 

CUSTOMER 

The customer is a product company developing a platform for automating customer communications using AI-based solutions. 

The team is small, fast-scaling, and operates with a low level of bureaucracy. The role involves direct communication with the customer team and a strong ownership-oriented engineering culture. 

The project is in an active development phase. The candidate will work on frontend features, backend services, external provider integrations, and contribute to the ongoing development of the existing platform. 

PROJECT 

The project is an agentic call center platform that uses Voice and Text AI agents to conduct real customer conversations, automate workflows, and integrate with CRMs and telecom providers. 

The platform helps businesses automate customer communication at scale, including bookings, call transfers, CRM workflows, messaging, and routing. 

From a technical perspective, the project is interesting because it includes frontend development with React/Next.js, backend services in Python, GraphQL APIs, real-time voice AI workflows, integrations with external providers, MongoDB, Aurora, RabbitMQ, Redis, Docker/ECS, and a future migration toward Kubernetes. 

Key Technologies 

TypeScript, React, Next.js, GraphQL, Apollo, Python, MongoDB, Aurora / PostgreSQL, RabbitMQ, Redis, Docker, ECS, Kubernetes, AWS, AI/LLM integrations, real-time voice AI. 

RESPONSIBILITIES 

• Develop and maintain full-stack features in a production environment.  
• Build user-facing functionality using TypeScript, React, and Next.js.  
• Work with server-side rendering and general Next.js patterns.  
• Build, consume, and maintain GraphQL APIs, ideally using Apollo.  
• Read, write, and maintain backend services in Python.  
• Contribute to API design, data modeling, and service-to-service communication.  
• Support integrations with CRMs, telecom providers, and AI-related vendors.  
• Work with MongoDB and Aurora / PostgreSQL for data storage.  
• Participate in debugging across the stack — from browser DevTools to backend logs.  
• Work with Docker and containerized deployments.  
• Contribute to CI/CD improvements, deployment safety, logging, monitoring, and observability.  
• Help keep production services stable, reliable, and easy to support.  
• Communicate directly with the customer team and take ownership of tasks from start to finish.  

REQUIREMENTS 

• 3+ years of full-stack engineering experience, preferably with a frontend focus.  
• Experience owning features end to end in a production environment.  
• Good working knowledge of TypeScript.  
• Strong experience with React and Next.js.  
• Familiarity with server-side rendering and general Next.js patterns.  
• Experience working with GraphQL, ideally Apollo.  
• Ability to build and consume GraphQL APIs.  
• Comfortable working with Python: able to read, write, and maintain backend services.  
• General understanding of backend fundamentals: API design, data modeling, and how services communicate with each other.  
• Experience with Docker and containerized deployments.  
• Experience with MongoDB or a relational database such as PostgreSQL / Aurora.  
• Understanding of basic schema design and ability to write reasonable queries.  
• Ability to debug across the stack, from frontend issues to backend logs.  
• Interest in production topics: logging, monitoring, reliability, and service health.  
• Proactive communication and ability to take a task and drive it without constant hand-holding.  
• Comfortable working in a small team with direct customer communication.  

WILL BE A PLUS 

• Experience with Python backend services in production.  
• Exposure to messaging systems such as RabbitMQ or similar tools.  
• Experience with Redis or other caching tools.  
• Experience with real-time systems: telephony, WebSockets, streaming, low-latency pipelines.  
• Familiarity with vendor orchestration patterns: fallback routing, provider selection.  
• Any Kubernetes experience, even in dev/staging environments.  
• Experience with AI/LLM, TTS/STT, or voice-related systems.  
• Exposure to security/compliance concepts: SOC 2, secrets management, audit trails.  

PERSONAL PROFILE 

• Proactive and ownership-driven mindset.  
• Comfortable working across frontend and backend.  
• Enjoys solving complex product and integration challenges.  
• Interested in AI-driven communication products.  
• Strong problem-solving skills.  
• Effective communicator in distributed and small teams.  
• Able to work independently and clarify requirements when needed. 

We are looking for a promising Python Developer (with basic Angular) to join our tech team. At GYBS, we build smart tech solutions that support our global operations. If you are a Junior dev who wants to skip the corporate bureaucracy, jump into real-world production, and supercharge your skills within a supportive team, we’ve GotYourBack!
 

REQUIRED SKILLS:

• 1+ year of commercial experience with Python 3;
• Solid understanding and practical experience with FastAPI;
• Experience integrating external APIs and services (REST APIs, WebSockets);
• Experience writing and maintaining PowerShell scripts;
• Good knowledge of PostgreSQL (SQLAlchemy) and Redis (caching, queues);
• Familiarity with MongoDB and NoSQL concepts;
• Confidence working in Linux environments and proficiency with Git;
• English level: Intermediate or higher (sufficient for technical documentation and team chats);
• Basic knowledge of Angular (ready to dive deeper into full-stack tasks).
   

WHAT YOU WILL DO:

• Develop and maintain backend services using Python (FastAPI);
• Integrate and support external APIs and third-party services;
• Take ownership of your code - design, optimize, and troubleshoot database solutions (PostgreSQL, MongoDB, Redis) from start to finish;
• Create and maintain PowerShell scripts for automation and operational tasks;
• Work in close teamwork with other developers to deliver complete end-to-end features;
• Participate in code reviews to ensure high code quality, performance, and maintainability;
• Demonstrate adaptability - be ready to switch between backend tasks, basic frontend updates in Angular, and infrastructure tweaks in a dynamic environment.
   

WOULD BE A PLUS:

• Good communication skills. Yes, we value clean code, but we appreciate it even more when you can clearly explain your ideas or discuss a solution out loud  😉
   

WHAT WE OFFER:

• The ultimate environment for result-oriented Growth: we are ready to mentor you, share knowledge, and help you level up your engineering skills through regular feedback and 1:1 sessions;
• Complete trust and freedom in your remote work format - work from wherever you feel most focused;
• A clear path for career development and grading system;
• An incredible engineering teamwork & vibe with zero toxic micro-management, and a gamified appreciation.
   

If you picture yourself as a part of a successful company - send us your resume!
 

See yaa, we’ve GotYourBack!

Our client is the world's largest automotive safety supplier.
N-iX team will work on a system that is used to control quality of production process as well as quality of produced items. We are looking for Senior Full Stack Developer to join our team.

Requirements:

• At least 4 years of commercial experience as Full Stack Software Developer.
• Proficient in TypeScript/JavaScript, Azure Functions.
• Backend expertise with .Net, RESTful API development, authentication, and authorization.
• Frontend development with React, Composition API, and internationalization.
• Strong debugging and optimization skills across full stack.
• Experience with Azure Functions, Azure SQL.
• Experience with data exchange with Snowflake as a plus.
• Familiarity with message queues, pub/sub patterns, and distributed systems.
• Unit and integration testing.
• Experience with Agile methodologies and tools like JIRA/Confluence.
• Good verbal and written communication skills.

• At least Upper-Intermediate level of English.

   

Responsibilities:

• Implement core backend logic, APIs, and integrations.
• Develop Azure Functions and work with Azure SQL.
• Ensure performance, reliability, and security of backend components.
• Develop and maintain frontend features using React, ensuring responsiveness and usability.
• Ensure responsive design, localization, and accessibility.
• Implement localization and accessibility best practices.
• Participate in code reviews, mentoring, and technical planning.

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

Main requirements

• We’re seeking a super-experienced Senior Fullstack Developer with deep expertise in JavaScript/TypeScript, particularly in Node.js, React, and Supabase, combined with practical experience in AI prompt engineering. You’ll architect, build, and optimize scalable applications that seamlessly integrate AI-assisted functionalities and modern cloud backends.

Requirements

Position Name: Senior FS Developer
Level: Senior FS Developer
Hard skills requirements (including years):

• 6+ years of Software Engineering experience
• 4-5 years of experience with Node.js (Express.js, koa.js, Nest.js)
• Strong experience and understanding of React, including Hooks and Context
• Strong experience and understanding of AWS
• Strong Software Design knowledge: OOD, FP, Design patterns
• Excellent knowledge of modern systems architecture components including microservices, event sourcing, and distributed data processing systems
• Proficient understanding of Git
• Excellent understanding of both NoSQL and SQL databases
• Experience with Docker & CI/CD processes
• Experience with Serverless framework, AWS Lambdas, AWS Cloudformation
• Knowledge of Agile (preferably SCRUM) development practices
• At least Upper-Intermediate level of English

Would be great 😎 :

• Strong experience with TypeScript
• Experience as a Tech / Team lead on projects
• A сomputer science, software engineering, or related field master’s or bachelor’s degree.
• Hands-on experience with messages queuing/delivery services (Amazon SQS, SNS, RabbitMQ, Kafka, etc.)

Responsibilities:

• Process improvements proposing and taking ownership of full-cycle of features delivering
• Active participation in technical discussions
• Actively participate in architectural design sessions, overall team meetings, product meetings, communities of practice, etc.
• Create an architectural design to illustrate high-level solutions to an application and feature requests
• Architect, design, and team cooperation to deliver features and services into production
• Writing and implementing efficient, extendable, and high-quality code in balance with rapid feature delivery
• Cross code reviews, technical documentation creation, and supporting

Upper English is a must

We are looking for a passionate Full-Stack Software Engineer with extensive experience in PHP and JavaScript who loves engineering and the product creation process. You will be responsible for developing new functionality, integrating different systems, optimizing, and modernizing the existing codebase.

The ideal candidate has experience in:

- PHP 8.X, multiple frameworks and libs;

- JavaScript from vanilla JS to React and ES14;

- HTML, CSS, SCSS, post-processing, scaffolding systems;

- relational databases, DB schema, and queries optimization;

- Linux, docker, CI/DI, bash;

- software engineering principles, architecture patterns, application scalability, low latency system availability;

- experience with cloud platforms such as AWS or Azure;

- problem-solving skills;

- communication and collaboration skills.

You will be responsible for:

- develop, architect, and maintain SaaS using PHP and its frameworks;

- implement frontend using JavaScript (from vanilla JS to modern libs and frameworks), HTML, SCSS;

- create and maintain RESTful APIs (SaaS and Proxy-APIs);

- design and optimize database interactions (PostgreSQL, AWS DynamoDB);

- write clean, testable, efficient, and maintainable code;

- test and debug your code to ensure the reliability and performance of the applications;

- collaborate closely with founders and service folks to deeply understand our customers/users.

Seniority:

- university degree (non-courses/academies; only technical university education);

- minimum 7+ years of actual experience (non «freelance», no gaps, ONLY respect years after a university degree);

- your years in IT don’t guarantee your seniority;

- the slope of your learning is MORE important than your total years in IT, but don’t kid yourself;

- this job vacancy is not for newcomers/juniors/entry/majority-mid level, one framework developer, and ONLY for product development folks.

The position is ONLY for Ukraine citizens. We don’t consider outsourcing, out-staffing, freelancing, or man-in-middle schemes; we only hire in Core Team as Core Team Member.

Join us for a fabulous adventure!

We’re looking for the best Shopify Developer in the DACH region – Full-time (m/f/d)

This position exists only once in our company.  
Highly paid, technically challenging, and you’ll work directly with some of the biggest brands in the DACH region.

Your responsibilities
- Technical coordination with the PM team
- Setting up more complex integrations
- Theme development

What’s important to us
- Experience with AI workflows (Claude, Cursor, Copilot)
- German language skills at C2 level (required!)
- Team player with strong client communication skills
- Several years of Shopify experience (Liquid, theme development, app integrations)

What we offer
- Excellent salary
- Latest Apple equipment
- Workations in the south and great team events
- Remote or office-based (Berlin / Düsseldorf)
- Direct access to our client and partner network

Please apply only if you have German language skills at C2 level.

We’re looking for a Senior Unity Developer who can turn a Figma concept into a polished, production-ready experience across iOS, Android, and Web. You’ll work on both the gameplay layer and the surrounding app experience that users interact with daily, so strong attention to performance, UX quality, and scalable architecture is essential.

What you’ll do

• Develop and release sweepstakes-style gaming applications for iOS, Android, and WebGL using a shared Unity codebase
• Create engaging game experiences — including slot-style mechanics, crash gameplay, instant-win formats, and future concepts — with high-end animation quality, responsiveness, and smooth interaction design
• Take ownership of features from initial specification and design through implementation, QA, and release
• Reproduce Figma designs with pixel-perfect accuracy across multiple devices, resolutions, and aspect ratios
• Integrate and maintain WebView-based functionality that operates outside the Unity environment
• Work with live backend infrastructure, handling networking realities such as latency, retries, authentication, reconnect flows, and server-authoritative logic
• Continuously optimize performance: FPS stability, memory usage, loading speed, draw calls, startup time, and especially WebGL build size
• Design maintainable systems with clear architecture, modularity, and code quality that supports long-term scaling
• Actively use AI-assisted development tools as part of the daily engineering workflow

Requirements

• 5+ years of commercial Unity development experience, including shipped mobile products on iOS and Android
• Hands-on experience building and deploying Unity WebGL projects, with solid understanding of platform limitations and optimization strategies
• Strong background in backend-connected applications: REST/WebSocket APIs, asynchronous workflows, authentication flows, reconnect handling, and robust error management
• Proven expertise in performance optimization, profiling, memory management, asset pipeline optimization, build size reduction, and ensuring stability on lower-end devices
• Strong architectural thinking with experience designing scalable systems and making sound technical decisions
• Ability to convert Figma designs into highly accurate UI implementations across platforms and screen formats
• Excellent C# knowledge and experience with Unity UI systems (UGUI/UI Toolkit), Addressables, and modern Unity workflows
• Practical experience using AI coding assistants such as Claude, Cursor, Copilot, Codex, or similar tools within real production processes
• Experience in social casino, sweepstakes, iGaming, or casino-related products

Would be a plus

• Experience developing crash games or other real-time multiplayer/server-authoritative mechanics
• Spine integration experience
• Experience creating native plugins and bridges for iOS/Android
• Familiarity with Unity CI/CD pipelines (Cloud Build, GitHub Actions, Fastlane)
• Experience integrating analytics systems, A/B testing, and live operations tooling
• Shader, VFX, or custom rendering experience
• Familiarity with remote config systems, feature flags, and hot content updates
• Experience with agentic/AI-driven development workflows

What to expect in this role
You’ll take full ownership of features — not only implementing functionality, but ensuring gameplay quality, cross-platform delivery, performance stability, and maintainable architecture. You’ll collaborate closely with design, backend, product, and QA teams. Senior engineers are expected to influence technical decisions, challenge weak solutions when necessary, and effectively use AI tooling to accelerate delivery without compromising quality.

Innoware is a leading IT consulting company, Microsoft Solutions Partner, certified in cyber and information security (ISO/IEC 27001). We help businesses enhance operational efficiency and ensure data security by implementing Microsoft ERP and CRM systems, Power Platform solutions, and delivering secure cloud IT infrastructure.

For over 24 years our team has successfully completed more than 500 projects in Ukraine and across 17 other countries. Our clients include well-known companies such as Ciklum, Deloitte, Datagroup, OKKO, KERNEL, Metinvest, the American Chamber of Commerce in Ukraine (ACC), SOS Children's Villages, and many other valued partners.

Demand for Innoware’s services and Microsoft solutions continues to grow – especially in Ukraine, where many businesses are transitioning away from 1C and other russian-origin systems. To support this growth, we are expanding our project team and inviting candidates to join us as a Microsoft Dynamics 365 Business Central Consultant at Middle or Senior level.

Key activities:

• Participation in D365 Business Central implementation and development projects for Innoware’s Ukrainian and foreign customer.
• Continuous development of expertise through work with diverse business scenarios, complex cases, integrations and modern capabilities of D365 Business Central.

Key responsibilities:

• Working with clients to analyze business processes, define target solutions, and align them within the D365 Business Central framework.
• Configuring and adapting standard D365 Business Central functionality according to customer business requirements.
• Preparing and aligning project documentation together with clients.
• Estimating effort and timelines for assigned tasks.
• Preparing functional specifications for the development team and collaborating with developers during implementation.
• Executing user acceptance testing to ensure the delivered functionality meets business needs and expectations.
• Supporting customers during UAT, deployment of new functionality, and Go Live.
• Mentoring less experienced specialists.
• Participating in planning and controlling data migration processes.
• Integrating D365 Business Central with other systems and applications.
• Ensuring quality control of tasks at different stages of the project.

Qualification:

• At least 3 years of experience implementing D365 Business Central system in a Consultant or Analyst role.
• Deep knowledge of standard functionality of D365 Business Central.
• Experience working independently with clients’ business requirements and developing functional solutions.
• Understanding of all stages of an ERP implementation project.
• Strong understanding of business processes (finance and/or logistics, trade, production, etc.) and their automation in D365 Business Central.
• English proficiency at Upper‑Intermediate level or higher; fluency in Ukrainian.
• Nice to have: Microsoft certification; experience configuring Power BI.

Soft skills:systematic thinking, teamwork, strong communication skills, focus on results and high quality, and a commitment to continuous professional development.

We offer:

• Dynamic work and diverse tasks in a growing D365 Business Central team.
• Participation in projects for Ukrainian and international clients, with English language practice.
• Knowledge sharing with experienced colleagues, participation in internal initiatives, and professional discussions.
• Conditions for continuous professional development, career growth, and advanced training, including international Microsoft certification and support in obtaining it.
• Career paths toward System Architect, Project Manager, or Team Lead, depending on your professional interests.
• Our values and corporate culture: Innoware is an environment of open, professional communication, teamwork, honest relationships, and mutual trust. We support each other in both work and life. We hold a pro-Ukrainian stance, have not worked with russian companies since 2014, and actively support the Armed Forces of Ukraine.

Working conditions:

• Full remote format with the opportunity to work and meet with colleagues at Innoware’s Kyiv office – we’ll be happy to see you whenever you choose to come.
• Everything for work-life balance: paid vacation and sick leave (we know it’s obvious, but we want you to be sure), additional days off for selected public holidays. We’re dedicated to our work, but we also take time to rest.
• Permanent full-time contract with competitive remuneration.
• A grade‑based system with regular salary reviews based on your qualifications, performance results, and professional development.

We would be happy to get to know you and discuss potential cooperation.

Please apply with your CV in Ukrainian or English. We will carefully review your application and contact you if your experience and qualifications match the role.

We invite you to collaborate with us to deepen your expertise and work on meaningful projects together with the experienced Innoware team.

Find out more about Innoware: https://innoware.com/about/ 

Discover more Innoware vacancies: https://innoware.com/career/ 

🚀 About Kilona.io

At Kilona.io, we build high-quality, high-speed web and mobile AI applications. We work with top global startups to create cutting-edge products that are fast, precise, and beautifully engineered. 

The project focuses on building and scaling mobile applications with strong backend logic, product analytics, and attribution systems. We need someone who is comfortable not only with React Native development, but also understands backend processes and mobile analytics integrations like AppsFlyer, PostHog, and Amplitude.

✅ Requirements

• 2+ years of hands-on experience with React Native (Expo OR CLI)
• Practical experience working with Node.js (Express.js)
• Experience with REST APIs and integrating databases (e.g., PostgreSQL, MongoDB, Firebase, Supabase, AWS DynamoDB, etc.)
• Good communication skills in English (B2 level or higher)
   

✨ Nice to have

• Experience with mobile app deployment (App Store, Google Play)
• Understanding of CI/CD pipelines for mobile apps
• Experience using AI-powered dev tools (e.g. ChatGPT, Cursor AI, Lovable, V0) to speed up development
   

🧑‍💻 Working Conditions

• Hourly-based payment model (overtime is always paid)
• Fully remote — work from anywhere
• Flexible schedule — we appreciate team overlap but you manage your own time
• Easy time-off policy — take days off when you need, no bureaucracy
• Work on cutting-edge AI products in a fast-paced and supportive environment

🔍 Hiring Process

1. Video intro OR Quick screening call (20 - 30 mins)
2. Technical interview (up to 1 hour)
3. Final interview (optional)
4. Offer 🎉

Interested? Let’s talk! 📨 Drop us a message — we’re always open to meeting like-minded people.

Rust Blockchain Developer (Solana)
Location: Remote
 Type: Full-time (exclusive focus required; no concurrent or part-time roles)

About Everstake
Everstake is one of the largest decentralized staking providers in Ukraine and a key player in the global Web3 infrastructure ecosystem. We support and operate blockchain networks at scale and actively invest in automation, performance optimization, and next-generation DeFi infrastructure.

We are expanding our engineering team and looking for a Middle+ Solana Rust Developer to work on high-load, low-latency blockchain systems.About the Role

This role requires 
• Strong Rust expertise, solid Web3 fundamentals, and a deep interest in performance, reliability, and blockchain internals.What You’ll Do
• Design and develop backend services in Rust for:
Transaction creation, simulation, validation, and lifecycle management
Block-building and transaction sequencing logic

 Build and maintain integrations with on-chain and off-chain services, including:
• DEXs, swaps, bridges, staking protocols, RPC providers
• Work with Solana-specific transaction models, signing flows, and execution constraints
• Aggregate and process on-chain and off-chain data to support:
Analytics, dashboards, monitoring, and alerting systems
• Develop and maintain APIs and internal services for observability and operational tooling
• Optimize systems for low latency, high throughput, and fault tolerance
• Ensure security and correctness, especially in cryptographic operations and key management
• Participate in code reviews, write unit and integration tests, and maintain clear documentation
• Collaborate closely with DevOps, Product, and Web3 researchers

What We’re Looking For
• 3+ years of production experience with Rust, ideally in backend or systems programming
• Strong experience building high-load backend services
• Hands-on Web3 / blockchain experience, including:
•Transaction building and signing
- RPC interaction and node communication
- Cross-chain or multi-protocol integrations
• Solana experience is highly preferred, including familiarity with its transaction model
• Solid understanding of blockchain cryptography (ed25519, secp256k1)

Practical experience with:
- Redis
- Docker
- Monitoring and observability tools (Grafana or similar)

• Strong understanding of secure, scalable backend architecture
• Ownership mindset, attention to detail, and ability to work independently in a fast-paced environment
• Clear communication skills and ability to collaborate in a distributed team (edited) 

One of the world's largest providers of products and services to the energy industry has a need to develop and support enterprise information system in Oil & Gas domain.
Product being developed is a cloud solution for interpretation of geological and geophysical data. Project is based on SCRUM methodology.
Our project is stable, long-term and constantly adopts new technologies such as newest Java and Eclipse RCP versions, cloud and GPU computing, microservices architecture and other innovative frameworks.
Work supposes close cooperation with Customer team located in Houston and following Agile principles.
Our team is senior, supportive and friendly.

• Responsibilities:

  • Collaborate closely with geophysicists, data scientists, and software engineers to translate scientific domain requirements into robust on-prem or Cloud software
  solutions.
  • Design, develop, and maintain high-performance applications for geophysical and geological data analysis, interpretation and visualization (e.g., seismic, horizon,
  fault, velocity model, etc.)
  • Present architectural designs and technical proposals to the architecture review board.
  • Ability to break down development tasks and lay out clear implementation roadmaps.
  • Implement and optimize computation algorithms
  • Design and develop both thin and thick client applications that interact with cloud-based microservices.
  • Ensure high code quality through unit testing, code reviews, security hardening and continuous integration with other domain tools
  • Provide technical support and lead user troubleshooting sessions to resolve issues and ensure smooth operation of DSG application.
  • Mentor junior developers and actively contribute to architectural and implementation decisions.
  • Embrace Agile/Scrum methodologies, delivering and demonstrating working solutions at the end of each sprint
  • Stay current with emerging technologies and trends in geophysical computing and software development.

• Mandatory Skills Description:

  6+ years of hands-on Java development experience
  Strong Java Core knowledge
  Experience with desktop development frameworks: Swing, SWT, or Eclipse RCP
  Proven experience designing and building complex systems end-to-end, not just maintaining or extending existing ones
  Practical understanding of multithreaded programming: ability to implement concurrency in code directly, not only through third-party libraries
  Solid knowledge of design patterns and software architecture principles
  Ability to clearly articulate past projects, personal responsibilities, and concrete individual contributions
  Experience working in non-microservices, non-cloud-native development environments (desktop, embedded, or domain-specific platforms)
  Stable career trajectory, no fragmented job history with short tenures

Experienced Microsoft.NET developer in building backend systems in Microsoft Azure. You will design and build services in a service oriented architecture.

Requirements:
 

• At least 3 years of experience designing and building APIs in ASP.NET (version 8.0 or higher)
• At least 3 years with Entity Framework Core (version 8.0 or higher)
• At least 3 years with Microsoft Azure
• At least 4 years with C#
• At least 4 years building unit and integration tests
• Knowledge of service oriented architecture principles
• Knowledge of integration patterns and principles
• Knowledge of OAuth / OpenID Connect security protocols
• Works according to SOLID principles
• At least 3 years with Azure DevOps and Git
• Understanding of UML activity diagrams and sequence diagrams

Nice to have:

• Azure Platform Services (App Service, Service Bus, Key Vault, Storage, SQL Database, AI Search)
• Azure DevOps YAML pipelines with PowerShell and Azure deployment services
• T-SQL (SQL Server)
• The IDesign Method

What We Offer:

• Transparent bonus payment system
• Competitive salary with regular compensation reviews
• Opportunity to bring your ideas to life and lead the entire process
• 40-hour workweek with flexible scheduling
• Paid vacation and sick leave benefits

Experienced Microsoft.NET developer in building backend systems in Microsoft Azure. You will design and build services in a service oriented architecture.

What We Seek:

• Proven experience in designing and building APIs in ASP.NET (version 8.0 or higher)
• Proven experience with Entity Framework Core (version 8.0 or higher)
• Proven experience with Microsoft Azure
• At least 8 years of professional experience with C#
• At least 8 years of experience in building unit and integration tests
• Knowledge of service-oriented architecture (SOA) principles
• Knowledge of integration patterns and principles
• Knowledge of OAuth and OpenID Connect security protocols
• Adheres to SOLID principles
• At least 7 years of experience with Azure DevOps and Git

• Understanding of UML activity diagrams and sequence diagram.

   

A plus when has:

• Proven knowledge of the following Azure Platform Services; App Service, Service Bus, Key Vault, Storage (blob- and table storage), SQL Database, AI Search
• Proven knowledge of Azure DevOps yaml pipelines in combination with powershell and Azure deployment services
• Proven knowledge of T-SQL (SQL Server)
• Proven knowledge of the IDesign Method

What We Offer:

• Transparent bonus payment system
• Competitive salary with regular compensation reviews
• Opportunity to bring your ideas to life and lead the entire process
• 40-hour workweek with flexible scheduling

• Paid vacation and sick leave benefits