Jobs Backend

 Required Experience/Qualifications 

• 3+ years of production experience with Go 

• Deep understanding of REST API design, batch processing, and websocket-based real-time data 

• Strong experience with MariaDB/MySQL, including query optimization and data modeling 

• Familiarity with GORM ORM 

• Experience with RabbitMQ as an event broker • Ability to read and understand PHP code (used for legacy migration) 

Nice to have: 

• Performance tuning for high-load systems (10K+ RPS) 

• Experience integrating or using Centrifugo (subscriptions, pub-sub messaging) 

• Familiarity with profiling tools and scalable Go architectures • Experience with PHP-to-Go migrations is a big plus 

Responsibilities 

• Develop and maintain core backend services (REST APIs, batch jobs, WebSocket services) 

• Ensure the system scales and performs reliably under high load 

• Optimize database interactions and handle complex relational data models 

• Assist in refactoring and migrating business logic from PHP 

• Collaborate with DevOps and frontend teams to deliver robust functionality 

Company Offers 

• Fully remote work setup 

• Competitive compensation 

• 8-hour working day 

• 20 days paid vacation + 8 days paid sick leave 

• Medical insurance 

• Friendly, professional team and long-term project 

Johnson Controls is a global leader in smart, sustainable building solutions, security, and fire protection. With over 140 years of innovation, we develop cutting-edge technologies that enhance efficiency, safety, and comfort in buildings worldwide. Our mission is to create a smarter, healthier, and more sustainable future through intelligent automation and advanced energy solutions.

About Johnson Controls

Johnson Controls is a global leader in smart, sustainable building solutions, security, and fire protection. With over 140 years of innovation, we develop cutting-edge technologies that enhance efficiency, safety, and comfort in buildings worldwide. Our mission is to create a smarter, healthier, and more sustainable future through intelligent automation and advanced energy solutions.

We are currently hiring an expert-level WordPress developer to help out on our project Booking Agent Info (Bookingagentinfo.com). We currently have 1 WP developer, and looking to bring on an additional developer to help us finish urgent work.

We have 3 sites in which we need help building features for. These are our products.
 

This is not a standard WordPress role. We’re looking for someone with deep technical ability who can work across databases, write and integrate APIs, and develop advanced custom solutions—not just tweak templates. You should have experience building and scaling complex platforms beyond the basics of WordPress.
 

We are looking for someone who is ready to push hard, work with urgency, and take real ownership over what they build. If you’re someone who thrives in fast-paced environments, takes initiative without being asked, and wants to help drive a product forward—not just complete assigned tasks—this could be a great fit.

What We're Looking For:

• Hard Worker with Drive: You're not just looking for a 9–5 gig. You’re driven, committed, and not afraid to put in long hours when needed to help us hit important goals. You have the mindset and energy to push through product sprints and build something meaningful.
• Deep Technical Expertise: You go far beyond WordPress basics. You're comfortable working with PHP at a high level, managing and optimizing large databases, and building as well as integrating APIs from scratch.
• Proactivity and Initiative: You don’t wait for permission—you spot issues, propose improvements, and start building better solutions on your own.
• Product-Focused Mindset: You think beyond code and care about the user experience and business outcomes. You contribute thoughtful feedback that improves the product.
• Independent and Reliable: You don’t need to be micromanaged. You take ownership of your work and follow through with accountability.
• Thorough and Detail-Oriented: You test your own work, troubleshoot edge cases, and take pride in delivering clean, functional code.
• Experience Creating Multilingual Sites: You have experience making a site multilingual using plugins like Polylang or WPML
• Experience with Symfony is a plus
   

About the Role

We are looking for a Python Backend Engineer to design, build, and support scalable backend services and data-driven applications. You will work with modern technologies including FastAPI, SQL, and Snowflake, and contribute to API development, third-party integrations, and cloud-based data solutions. You will be a key driver of operational excellence through advanced testing, CI/CD, and mentorship.

Key Outcomes & Responsibilities

• Architectural Excellence: Write high-quality, testable Python code (FastAPI) and set engineering standards for simplicity and maintainability.
• Advanced Integrations: Design and implement complex integrations across internal services, cloud data platforms (Snowflake), and third-party systems using REST, webhooks, and OAuth2.
• Data Strategy: Develop and optimize SQL for analytics and operational use cases, including schema design and query performance tuning.
• Mentorship & Leadership: Review code created by other engineering staff to provide timely feedback and mentor junior/mid-level peers on development best practices.
• Operational Ownership: Drive CI/CD and DevOps initiatives, ensuring robust observability (logging/metrics) and incident response for production APIs.

Required Qualifications

• Experience: 5+ years of experience as a Software Engineer or Developer.
• Expertise: Expert-level proficiency with Python and modern backend frameworks like FastAPI.
• Cloud/Data: Significant experience with cloud data platforms (e.g., Snowflake) and cloud service providers (AWS/Azure).
• Integration: Expert in authentication patterns (OAuth2, API Keys) and integrating third-party systems.
• Tools: Expert in source control (GitHub) and Jira/Confluence for technical documentation.
  
  Nice to Have
• CI/CD and DevOps experience
• Docker / containerization
• Observability (logging, monitoring)
• Cloud experience (AWS / Azure / GCP)

A direct contract with the product company (PropTech, US).

Work schedule: remote CET business hours.

We’re excited to offer a long-term opportunity for an experienced Back-end Developer (Node.js) to join a team of professional engineers and designers. Together, you’ll be working on a US-based product that’s set to make a significant impact on the PropTech scene. This role offers the chance to contribute to a major market and collaborate with top talent in a dynamic environment.

About ElevateOS Product:

ElevateOS has been improving the resident experience for over seven years. We created a single, all-in-one platform that makes it easy for property managers and resident staff to work together. Our goal is simple: to provide the best experience for residents by replacing multiple, confusing apps with one easy solution.

This is a stable, long-term project that continues to grow, and you'll have the chance to be part of its ongoing success.

Our primary technology stack revolves around JavaScript. We use React for the front-end, Node.js for the back-end, and React Native for mobile development.

Requirements:

- 4-5+ years of development experience with Node.js;

- Practical knowledge of VanillaJS, Typescript, Nest.js;

- Hands-on experience creating robust API’s and designing scalable back-end architecture;

- Experience with managing data and using different types of databases (SQL and non-SQL) for storing and operating on data;

- Experience delivering (even small) projects, using modern tools like CircleCI, Docker, Kubernetes, Swarm and navigating through different environments like AWS, GCP, Digital Ocean.

- Good understanding of ECMAScript specifications;

- Good knowledge of GIT;

- Proficient in English language.

Additional (good-to-have) skills:

- Experience with Microservice Architecture;

- Experience working with AWS.

Responsibilities:

- Creating first-class back-end systems by writing clear, sustainable and well-tested code;

- Improving performance and refactoring existing code;

- Cooperating with the Product, UI/UX, QA and Front-end teams to fulfil project goals;

- Configure project environments and deployment procedures;

- Bugfix during the development process;

- Cover your code with unit tests;

- Write documentation.

We are looking forward to having you on board to contribute to our journey of transforming real estate property management!

We’re excited to offer a long-term opportunity for an experienced Back-end Developer (Node.js) to join a team of professional engineers and designers. Together, you’ll be working on a US-based product that’s set to make a significant impact on the PropTech scene. This role offers the chance to contribute to a major market and collaborate with top talent in a dynamic environment.
 

About ElevateOS Product

ElevateOS has been improving the resident experience for over seven years. We created a single, all-in-one platform that makes it easy for property managers and resident staff to work together. Our goal is simple: to provide the best experience for residents by replacing multiple, confusing apps with one easy solution.

This is a stable, long-term project that continues to grow, and you'll have the chance to be part of its ongoing success.

Our primary technology stack revolves around JavaScript. We use React for the front-end, Node.js for the back-end, and React Native for mobile development.


Requirements:

- 4+ years of development experience with Node.js;
- Practical knowledge of VanillaJS, Typescript, Nest.js;
- Hands-on experience creating robust API’s and designing scalable back-end architecture;
- Experience with managing data and using different types of databases (SQL and non-SQL) for storing and operating on data;
- Experience delivering (even small) projects, using modern tools like CircleCI, Docker, Kubernetes, Swarm and navigating through different environments like AWS, GCP, Digital Ocean.
- Good understanding of ECMAScript specifications;
- Good knowledge of GIT;
- Proficient in English language.


Additional (good-to-have) skills:

- Experience with Microservice Architecture;
- Experience working with AWS.


What will your responsibilities include?

- Creating first-class back-end systems by writing clear, sustainable and well-tested code;
- Improving performance and refactoring existing code;
- Cooperating with the Product, UI/UX, QA and Front-end teams to fulfil project goals;
- Configure project environments and deployment procedures;
- Bugfix during the development process;
- Cover your code with unit tests;
- Write documentation.


We are looking forward to having you on board to contribute to our journey of transforming real estate property management!

## About Us

We are building the next generation of financial infrastructure - programmable, transparent, and accessible to everyone. Our platform processes millions of transactions daily, bridging traditional finance with decentralized protocols.

## The Role

We're looking for a Senior Backend Engineer to design, build, and scale the systems that power our payment rails, on-chain settlement layer, and API platform. You'll work at the intersection of high-performance distributed systems and blockchain technology, shipping code that moves real money.

## What You'll Do

- Design and implement low-latency microservices in Go that handle payment processing, ledger management, and transaction orchestration.

- Build and maintain production-grade RESTful and gRPC APIs serving thousands of requests per second to internal teams, partners, and third-party developers.

- Own the HTTP gateway layer - rate limiting, authentication (OAuth 2.0 / API keys), request validation, and observability middleware.

- Architect event-driven pipelines using Kafka or NATS for real-time transaction streaming, reconciliation, and compliance monitoring.

- Contribute to our internal blockchain indexer — parsing blocks, decoding contract events, and maintaining a queryable transaction history.

- Collaborate with the security and compliance team on KYC/AML data flows, audit logging, and regulatory reporting.

## What We're Looking For

- 5+ years of professional backend engineering experience, with at least 3 years writing production Go.

- Strong understanding of HTTP/1.1 and HTTP/2 semantics, TLS, connection pooling, and API design best practices.

- Hands-on experience with blockchain technologies — interacting with nodes (JSON-RPC / WebSocket), parsing transactions, or integrating wallets and custodians.

- Experience with PostgreSQL (or CockroachDB) at scale — schema design, query optimization, migrations, and replication.

- Working knowledge of Docker, Kubernetes, and CI/CD pipelines in a cloud environment (AWS, GCP, or Azure).

- Comfort with distributed systems concepts: consensus, idempotency, eventual consistency, saga patterns.

- Understanding of financial concepts: double-entry bookkeeping, settlement, float management, and reconciliation.

## Nice to Have

- Contributions to open-source Go libraries or blockchain tooling.

- Knowledge of zero-knowledge proofs or privacy-preserving payment systems.

- Prior experience at a regulated fintech, neobank, or crypto exchange.

## Tech Stack

Go, FastHTTP, Kubernetes, Docker

## What We Offer

- Fully remote with optional co-working budget.

- Annual learning stipend for conferences, courses, and certifications.

- Hardware budget for your ideal dev setup.

- Flexible PTO and company-wide recharge weeks.

- Early-stage impact — your architectural decisions will shape the platform for years.

We’re looking for a Senior .NET Developer to join our team and work on a long-term project for a US-based client — a large-scale B2B digital commerce platform used by enterprise manufacturers and distributors across US and Europe.
You’ll be working on a complex, production-grade web application where the frontend is just as demanding as the backend — think interactive canvas-based editors, rich data grids, and real-time UI components.

Requirements

• 4+ years of experience with ASP.NET MVC and C#
• Strong TypeScript and jQuery skills
• Hands-on experience with HTML Canvas and canvas-based libraries (FabricJS or similar)
• Experience with Handsontable.js or comparable data grid solutions
• Solid understanding of IIS-hosted environments
• Upper-Intermediate English (written communication with the client)

We Offer

• Remote work, full-time
• Long-term stable project with a mature US client
• Direct involvement in product decisions — not just ticket execution
• English-speaking environment
• Collaborative team with strong engineering culture

⚠️ Disclaimer: AI-based tools are used to support the initial review of applications. Please note that if your resume or cover letter does not reflect the skills listed below, your application may be automatically skipped.

About company and product

A Singapore seed-stage startup is a platform for fan communities that brings together communities around anime, K-pop, and other subcultures — all in one place. Our goal is to become the go-to fandom platform on the internet where every type of fandom in the world is found.

The mobile app is currently live on iOS and Android after launching our MVP, which was soon followed by Version 2.0, and the company are now building Version 3.0 with the goal of scaling toward our Series A.

📍About the role

At the moment we’re on a mission to find a Founding Engineer — 1st in-house tech employee — to help scale our platform toward Series A and beyond. We seek an ambitious Backend Engineer who’s experienced in building and scaling applications with thousands of users and would like to join us on a mission to build the future of how the world experiences fandoms.

This is a learning-intensive role aimed at building the expertise and foundation needed to eventually steer the company’s architectural direction.

Your core responsibility will be to own, understand, and optimize the backend systems of our mobile app. Your main focus will be to (1) build the algorithms that power our core user experience, and (2) strengthen the cloud infrastructure to support scaling to 1 million users.

What you will do during the first quarter – six months

The founding engineer will work closely with Uptech under the guidance of the Tech Lead, while collaborating within the Huddle team on high-level strategic decisions. 
 

– Design and implement the core recommendation and engagement algorithms.

– Collaborate with the Uptech and Huddle team to integrate algorithms into the system.

– Define data structures and pipelines to support algorithm efficiency and scalability.

– Test and refine algorithms to optimize performance.

– Contribute to high-level technical decisions around algorithm architecture and future enhancements.

📍Requirements for candidates

• You have 3-5 years of professional experience as a back-end engineer or full stack developer, preferably in high-growth startups or product-driven teams.
• You are comfortable working in a fast-paced environment, where priorities evolve quickly and execution speed matters.
• You take full ownership of technical outcomes and act as the primary technical decision-maker.

• Excellent communication English skills (both verbal and writing)

   

Backend & Data:

• Strong experience with Node.js and NestJS
• Solid knowledge of PostgreSQL
• Familiarity with NoSQL databases
• Experience designing APIs and data models for high-traffic systems
• DB performance optimization (indexes, queries, schemas)

Infrastructure & CI/CD:

• Hands-on experience with Amazon Web Services
• Infrastructure as Code with Terraform or similar tool
• Experience building CI/CD pipelines (tests, builds, deployments)
• Understanding of containerized deployments and rollback strategies

Code Quality:

• Experience with automated testing (unit / integration)
• Linters, formatters, and code review practices
• Focus on maintainable, production-ready code

Algorithms & Performance:

• CS / Math background
• Experience with feed or ranking algorithms
• Performance optimization: caching, lazy loading, preloading, thumbnails
• High-load experience is a plus

Nice-to-have requirements for candidates:

• Observability: Monitoring with Grafana observability stack (i.e. Prometheus)
• Experience in social platforms, community-based apps, or messaging products.
• Strong understanding of startup product cycles, from MVP to scale.
• Interest in building immersive environments (virtual spaces) or 3D avatar-based interactions.

• Interest in web applications.

   

Stages of communication:

1. Intro Call with recruiter — 30 min
2. Tech pre screen — 30 min
3. Competency-based interview — up to 1 h
4. Technical Assessment (2 stages): Tech Interview (2 h), Design Session (2 h)
5. Executive interview and Offer
    

___________________________________________

1️⃣ Benefits package for a Remote employee (B2) consists of:

• 14 days annual leave + up to 14 days paid sick leave after 3 month probation period pro-rated;
• Public holidays according to remote employee's (B2B) country of residence;
  * Employee covers social security, taxes, and medical insurance.
•  Salary with Equity.

2️⃣ Benefits package for an Onsite employee consists of:

• Relocation package Singapore (PR pathway, settling-in allowance; 
• One free annual round-trip flight to your home country;
• 14 days annual paid leave per calendar year;
• Up to 14 days sick leave and up to 60 days hospitalisation leave after 3 months of employment;
• Full basic medical insurance coverage, including outpatient treatment, hospitalisation, and dental care, subject to the insurer’s policy terms;
• Salary with Equity;
• Post-Funding Benefits;
• Office-based (hybrid flexible).

N-iX is looking for an experienced Senior Java Engineer who goes beyond standard CRUD APIs and lives in the world of information retrieval.

Our customer is a Fortune 500 company. As a leading business-to-business organization, more than 3.2 million customers rely on its products in categories such as safety, material handling, and metalworking, along with services like inventory management and technical support. ​

In this role, you will act as the bridge between our core Java application architecture and our specialized search infrastructure. You will be responsible for the entire search lifecycle: from designing how data is ingested and indexed, to building the Java APIs that query that data, and crucially, tuning the relevancy algorithms that ensure our users find exactly what they are looking for, instantly. The ideal candidate has deep roots in the Apache Solr ecosystem but is also ready to embrace modern cloud-native search via AWS OpenSearch. Whether you are maintaining critical legacy Solr clusters or architecting new solutions on AWS, your goal is to make data findable, fast, and relevant.

Technology stack: Java/Spring Boot, Apache Solr (Legacy/Core), AWS OpenSearch (Modern/Growth), SQL DB, Kafka 

Responsibilities:

• Design, develop, and maintain high-performance backend Java services (primarily Spring Boot) that integrate with search engines.
• Build complex search features for the frontend, including faceted navigation (filtering), multi-tenant searching, real-time autocomplete/typeahead, and spell-checking suggestions.
• Utilize Java client libraries (such as Solr or AWS SDKs) to construct efficient, programmatic queries.
• Take ownership of the search schema design, deciding how complex data structures should be analyzed, tokenized, and stored for optimal retrieval.
• Build robust ETL pipelines in Java (potentially using Kafka or other messaging systems) to synchronize data from primary SQL databases into the search indices in near real-time.
• Configure analyzers, stemmers, and tokenizers to handle nuances in human language.
• Diagnose slow queries, analyze search logs, and optimize both Java application code and search engine configurations for low-latency performance.
• Maintain and optimize existing on-premise or cloud-hosted Apache Solr installations.
• Play a key role in designing hybrid strategies or migration paths from legacy Solr systems to managed AWS OpenSearch environments.

Requirements: 

• 5+ years of professional experience in backend software development using modern Java (Java 8+, Spring Boot ecosystem).
• Strong, demonstrable experience with Search Technologies. This means either:
  • Hands-on production experience configuring, managing, and developing against Apache Solr (understanding schema.xml, solrconfig.xml, Zookeeper integration).
  • OR deep foundational knowledge of Lucene-based search concepts (inverted indices, analysis chains, TF-IDF/BM25 scoring logic) with the ability to quickly apply that to Solr.
• Hands-on experience with AWS OpenSearch (or Elasticsearch) in a managed cloud environment.
• Experience with data modeling in relational databases (PostgreSQL, MySQL, Oracle).
• Strong understanding of RESTful API design principles.
• Preferred Qualifications:
  • Experience architecting zero-downtime migrations from self-hosted Solr to managed cloud search services.
  • Experience with event-driven architecture and streaming tools like Apache Kafka for real-time indexing.
  • Familiarity with containerization (Docker, Kubernetes) and CI/CD pipelines like Jenkins or GitLab CI.

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

N-iX is looking for a Lead Backend (Scala) Engineer to join our team.

Our customer is the European online car market, with over 30 million monthly users and a presence in 18 countries. As a Lead Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers.

Responsibilities:

• Developing scalable backend services
• Designing complex database solutions
• Designing fast, scalable, and responsive APIs
• Day-to-day work with AWS
• Working in cross-functional teams
• Ready to take ownership and independently drive topics 

Requirements:

• At least 6+ years of hands-on coding experience
• Java Spring Boot or Scala knowledge 
• Experience with Object-Oriented/Functional Programming
• Experience in designing fast, scalable, and responsive APIs
• Experience developing cloud-native apps - AWS is preferable
• Experience with SQL and NoSQL (DDB) databases
• Experience with Kafka
• Good communication skills (fluent English, at least Upper-Intermediate)

Nice-to-Have:

• Experience with Search databases - ElasticSearch (using it as a search engine);
• Frontend experience - JavaScript or Typescript 
• DevOps Experience - DataDog, Opsgenie, etc.

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

Data Science UA is a service company with deep expertise in AI and Data Science. Our story started in 2016 with the first Data Science UA Conference in Kyiv, and since then, we’ve built one of the largest AI communities in Europe.

About the role:
We are looking for a Backend Software Engineer to join our team and help us build a pipeline for IoT data. The system ingests streams, stores data in a shared layer, and integrates with CV/AI engines for preprocessing and inference. The engineer will build and maintain the pipeline, but will not be responsible for model fine-tuning. Fine-tuning will be performed separately using SageMaker.

Responsibilities:
- Build and maintain the pipeline for IoT data, including ingestion, processing, and integration layers.
- Work with AWS services such as EC2, S3, SageMaker, and at least one NoSQL database (DynamoDB or MongoDB).
- Integrate with CV/AI engines in Python, ensuring configurable model loading and runtime selection.
- Implement the data flow architecture with reliable lifecycle management and backpressure handling.
- Ensure production readiness on Linux, with observability, logging, metrics, and robust error handling.
- Collaborate with the team to support fine-tuning workflows via SageMaker (but not performing fine-tuning personally).
- Preferably, have some knowledge of IoT concepts, AWS IoT Greengrass, and protocols like MQTT, since the pipeline shares architecture with existing IoT systems.

Requirements:
Must-have:
- Strong Python skills, OOP, clean architecture, and typing.
- Experience with multiprocessing/concurrency (process lifecycle, IPC patterns, queues/shared memory).
- Comfortable working in Linux (systemd/services, networking basics, profiling/debugging).
- Familiarity with AWS services (EC2, S3, SageMaker) and at least one NoSQL database.
- Knowledge of streaming data and reliability constraints (timeouts, retries, resource cleanup).

Should-have:
- Some exposure to IoT data and IoT protocols like MQTT.
- Experience with CV/AI Python libraries such as numpy, OpenCV, PyTorch or TensorFlow.
- Experience with pipeline integration, database connectors, and event-driven architectures.

We offer:
- Free English classes with a native speaker and external courses compensation;
- PE support by professional accountants;
- Medical insurance;
- Team-building events, conferences, meetups, and other activities;
- Many other benefits, which will be shared during the interview. 

Data Science UA is a service company with deep expertise in AI and Data Science. Our story started in 2016 with the first Data Science UA Conference in Kyiv, and since then, we’ve built one of the largest AI communities in Europe.

About the role:
We are looking for a Full-Stack AI Platform Engineer to join our team and help build, maintain, and scale AI-powered interactive products.
This is a hands-on role for an engineer who owns deployment, infrastructure, real-time systems, and AI-service integration end to end. You will work on production systems that combine web applications, real-time communication, Kubernetes-based backend services, and GPU-hosted AI pipelines.
The core of this role is production reliability and deployment ownership — keeping live systems stable, responding to incidents, and integrating AI models into scalable real-time infrastructure. Frontend work exists but is secondary: the team has a designer and uses AI-assisted tooling for UI iteration.

Responsibilities:
- Own deployment, environment management, and release workflows across Kubernetes-based, Railway-hosted, and other cloud infrastructure.
- Respond to production incidents, perform rollbacks, and restore service stability, including outside business hours.
- Deploy and operate AI inference services on GPU platforms such as Modal or RunPod and integrate them into real-time product flows.
- Build and maintain real-time communication and async processing flows, including LiveKit-based session infrastructure.
- Work with TypeScript / JavaScript and Python application code in production environments.
- Support database-backed product features, schema evolution, and migration workflows.
- Improve observability, logging, monitoring, and incident debugging workflows.
- Contribute to frontend and backend product functionality as needed, using AI-assisted tooling where appropriate.
- Maintain clear and up-to-date documentation for every product, service, and integration, including architecture diagrams, API contracts, deployment procedures, and environment configuration.
- Ensure every new feature is discussed, scoped, and agreed upon before implementation begins. No undocumented or uncoordinated changes to production systems.
- Collaborate with engineering and product stakeholders to clarify requirements, identify risks, and ship practical solutions.

Required skills:
- Strong hands-on experience with TypeScript (Node.js) and Python for production backend development.
- Solid experience with Kubernetes, Helm, and container-based deployment workflows.
- Experience with real-time systems: WebSocket-based communication, session lifecycle management, and event-driven flows.
- Experience deploying and operating AI inference services on GPU platforms such as Modal, RunPod, Replicate, or similar.
- Experience integrating LLM-based services, voice AI APIs, or media-processing pipelines into production systems.
- Experience debugging distributed or multi-service systems, including reading logs across multiple services and environments.
- Comfort with production ownership: incident response, rollbacks, and on-call responsibility.
- Solid understanding of backend APIs, service integration, and system design.
- Experience with PostgreSQL and ORM-backed schema management and migrations.
- Sufficient frontend experience to ship and deploy UI changes with AI-assisted tooling.
- Ability to work independently and bring structure to ambiguous technical situations.
- Strong written and verbal English communication skills.
- Experience using AI-assisted coding tools (e.g., Cursor, GitHub Copilot, Gemini) for faster development and iteration

Nice to have:
- Hands-on experience with real-time audio/video systems such as LiveKit or similar platforms.
- Experience with avatar, video rendering, or real-time media processing pipelines.
- Experience with frameworks and tooling such as TanStack Start, Nitro, or Vite.
- Familiarity with vector databases or embedding-based retrieval (pgvector or similar).
- Familiarity with Python ML stacks such as PyTorch or CUDA-based GPU inference.
- Experience with voice AI pipelines involving services such as ElevenLabs or Deepgram.
- Experience with CI/CD pipelines such as Jenkins, GitHub Actions, or similar.
- Experience with Next.js and Nx monorepo environments.
- Experience with GraphQL / Apollo or similar API integration patterns.

What we value:
- Strong ownership and reliability, especially in production.
- Pragmatic engineering judgment: shipping something stable beats over-engineering.
- Comfort with production responsibility and debugging under pressure.
- Ability to move across backend, infrastructure, and frontend without losing clarity.
- Clear communication, honest estimation, and practical execution.
- Documentation discipline: if it is not written down, it does not exist.

What we offer:
- Real impact: your content will directly attract new clients.
- Mentorship and growth.
- Freedom to experiment and test new formats.
- Flexible schedule and a remote-first culture.

We are looking for a Software Engineer with strong backend expertise to strengthen our engineering team at a successful web project from the USA.

As a Software Engineer, you will contribute to building and enhancing the platform within a collaborative engineering team. While the current stack includes Angular and Node.js, the strategic goal is to expand backend capabilities and strengthen collaboration with engineering and ETL teams.

Depending on project priorities, you may initially focus on Angular/Node.js features, while gradually contributing more to backend services and integrations, where .NET/C# experience will be valuable. You should be comfortable working across the stack when needed.

Our ideal candidate:

• Is comfortable working across both frontend and backend when needed
• Brings strong backend engineering experience
• Can help increase the technical seniority of the team
• Is proactive and capable of contributing to technical direction and system design
• Demonstrates strong ownership and problem-solving skills
• Is collaborative, comfortable working in ambiguous environments, able to mentor others, and raise the overall technical maturity of the team

Requirements

Must have

• 5+ years of professional software development experience.
• Strong experience in backend development.
• Hands-on experience with Node.js and Angular.
• Previous or current experience with .NET / C#.
• Experience designing and implementing backend services or APIs.
• Strong problem-solving skills and the ability to work with complex systems.
• Upper-Intermediate English (B2+) or higher.
• Proactive mindset and ability to take ownership of technical solutions.

Will be a plus

• Experience with AWS or other cloud platforms
• Experience working with healthcare systems or regulated environments
• Experience with SQL and/or NoSQL databases (e.g., MySQL, MongoDB)
• Mentorship or technical leadership experience

Responsibilities

• Develop and maintain features using Angular and Node.js (Express).
• Contribute to backend services and system architecture where applicable.
• Strengthen the team's backend expertise and engineering maturity.
• Collaborate with engineering and ETL teams on integrations and data-related workflows.
• Participate in architecture discussions, code reviews, and technical decision-making.
• Identify opportunities to improve system scalability, reliability, and maintainability.
• Share knowledge and support other engineers when needed.

About Project

Our client is a Software company from the USA.

Product

This platform is dedicated to ensuring payment integrity for health payers. Our project focuses on creating and implementing cutting-edge technology solutions to tackle current and future challenges in the healthcare industry for health plans. By bringing together payers, providers, and business partners on one technology platform, we aim to facilitate transparent communication and support collaboration.

Stage

Active phase of development

Project team

Existing team on the client side. We work with the US team (Eastern and Central time zones) — around 10 people. Our team is 17 people (9 MEAN stack developers, 8 QA, 1 PM)

Project Technologies

MEAN (MongoDB, Express. js, Angular and Node.js)

Work schedule

Full-time working day (flexible hours), possibility to work remotely or visit our offices in Lviv, Kyiv or Krakow.

Interview Stages

1-st stage — Call with Recruiter (30 minutes)
2-nd stage — Interview with our Senior Engineer (1 hour)
3-rd stage — Client interview

We are looking for a highly skilled Senior Java Engineer with additional experience in Python to join our team. The primary focus will be on building and maintaining high-performance, scalable, and secure applications using Java, while leveraging Python for automation, scripting, data processing, or integration tasks. This role is ideal for an engineer who is strong in Java development but comfortable applying Python as a supporting language where needed.

Responsibilities

• Design, develop, test, and maintain applications and services using Java as the primary technology stack.
• Write clean, efficient, and maintainable code following best practices and coding standards.
• Use Python for automation, data manipulation, system integration, and auxiliary services.
• Optimize applications for performance, scalability, and security.
• Troubleshoot, debug, and resolve technical issues.
• Communicate with internal product owners and stakeholders
• Document technical solutions and maintain up-to-date system knowledge.

Requirements

• 4+ years of professional software development experience with Java (Spring, Spring Boot, Hibernate).
• Experience with Python (scripting, automation, or backend services).
• Experience with RESTful APIs design and integration.
• Experience with relational database systems (preferably MySQL).
• Experience with cloud platforms (preferably GCP)
• Strong understanding of Agile methodologies, especially of the Scrum framework
• Strong problem-solving and analytical skills.
• Upper-Intermediate English or higher (both written and spoken).

Nice to Have

• Knowledge of messaging systems (RabbitMQ, etc.).
• Knowledge on DevOps process (CI/CD stages, gitflow, DevOps as shared responsibility)
• Experience with AI tools (e.g., Claude Code, etc.)
• Experience with infrastructure implementation (Kubernetes, Docker)
• HIPAA Awareness

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

N-iX is looking for a highly skilled Middle Java Engineer with additional experience in Python to join our team. The primary focus will be on building and maintaining high-performance, scalable, and secure applications using Java, while leveraging Python for automation, scripting, data processing, or integration tasks. This role is ideal for an engineer who is strong in Java development but comfortable applying Python as a supporting language where needed.

Responsibilities

• Design, develop, test, and maintain applications and services using Java as the primary technology stack.
• Write clean, efficient, and maintainable code following best practices and coding standards.
• Use Python for automation, data manipulation, system integration, and auxiliary services.
• Optimize applications for performance, scalability, and security.
• Troubleshoot, debug, and resolve technical issues.
• Communicate with internal product owners and stakeholders
• Document technical solutions and maintain up-to-date system knowledge.

Requirements

• 3+ years of professional software development experience with Java (Spring, Spring Boot, Hibernate).
• Experience with Python (scripting, automation, or backend services).
• Experience with RESTful APIs design and integration.
• Experience with relational database systems (preferably MySQL).
• Experience with cloud platforms (preferably GCP)
• Strong understanding of Agile methodologies, especially of Scrum framework
• Strong problem-solving and analytical skills.
• Upper-Intermediate English or higher (both written and spoken).

Nice to Have

• Knowledge of messaging systems (RabbitMQ, etc.).
• Knowledge on DevOps process (CI/CD stages, gitflow, devops as shared responsibility
• Experience with AI tools (e.g. Claude Code etc.)
• Experience with infrastructure implementation (Kubernetes, Docker)
• HIPAA Awareness

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