Jobs Backend

Skills required

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We expect you to have the following skills

- .NET (~latest versions)

- EF

- MS SQL

- React

We are usually using the latest versions.

Also:

- Ability to adapt to and work with a large codebase

- AI API experience is a plus (not a must)

Process

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We have daily Scrum and a weekly goal-setting / 1-1. The meetings are optional but preferred so everyone knows better what's happening, and can ask questions.

Other than that, development hours are rather flexible. Optimal hours would probably be full-time (but part-time is also fine).

Development work

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We would expect you to do the following:

✅ Plan & problem-solve

✅ Implement (clean, consistent, simple, fast code that is nice to read and easy to maintain / change)

✅ Test

Understanding how to create good user experience would be good.

Please also start your answer with word foo just to confirm that you did read this text so far.

Client-side

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You should be able to fluently work with react + TypeScript (also able to create a .NET api for the react components you build)

Backend

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We would expect you to know Linq and to understand performance and basic data structures both against SQL and in-memory.

Storage

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You would be sometimes working with T-SQL schema updates: adding/removing columns, migrating data, working with triggers.

Apis for mobile clients

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Sometimes you could work with apis used by native mobile clients.

AI

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It would be good if you have experience working with AI related APIs but this is not a must - just a nice-to-have.

Applying for the job

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Please, in your answer, quickly answer to the questions below.

Also please end your reply with the word bar, just to confirm you did read this far.

It could be also beneficial if you would upload a short voice sample in just to be sure English is good enough, to avoid extra work with the assignments.

Interviews

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Our interview consists of

- Coding assessments / skill tests

- Quick discussion to check language skills etc

- Building a sample test assignment, discussing requirements and PRs with us

- More thorough discussion about past work experience

• Project Description:

  By applying for this position, you may join one of the most respected and rapidly growing institutional investors globally. Our client is a professional investment management organization that manages funds to ensure long-term sustainability. The company invests across all major asset classes, including public equity, private equity, real estate, infrastructure, and fixed-income instruments, with offices in Toronto, London, Hong Kong, New York, São Paulo, Luxembourg, and Mumbai.
  
  The client attracts and selects high-caliber individuals from top-tier institutions worldwide. Joining the team offers the opportunity to work with diverse and inspiring colleagues and approachable leaders, engage in stimulating work within a fast-paced and intellectually challenging environment, and gain accelerated exposure and responsibility. There are also global career development opportunities and the motivation of contributing to an important social purpose grounded in strong principles. The organization maintains a deeply rooted culture centered on integrity, partnership, and high performance.
  
  If you are passionate about performance, value a collegial and collaborative culture, and uphold the highest standards of integrity, this opportunity may be right for you.
   

• Responsibilities:

  The Technical Lead will oversee the technical strategy and execution of fintech projects, managing a distributed team of Python developers and ensuring seamless delivery on AWS infrastructure. This role merges technical leadership, people management, and client communication, requiring a proactive and empathetic approach to both technology and team development.
  Key Responsibilities
  • Lead and coordinate a remote development team across multiple time zones to deliver high-quality fintech software solutions.
  • Oversee project architecture, development, deployment, and performance optimization using Python and AWS.
  • Ensure robust, scalable, and secure system design aligned with fintech industry standards and compliance requirements.
  • Build and maintain strong client relationships, providing regular progress updates and strategic technical insights.
  • Conduct regular performance reviews, one-on-one check-ins, and mood monitoring to foster engagement and well-being within the team.
  • Mentor engineers, support professional growth, and encourage knowledge sharing across teams.
  • Manage project timelines, risks, and dependencies in accordance with agile principles.
  • Identify and drive improvements in development processes, collaboration practices, and product quality.
  • Collaborate with product managers and business stakeholders to align technical solutions with strategic goals.
   

• Mandatory Skills Description:

  • Bachelor's or Master's degree in Computer Science, Engineering, or a related field.
  • 8+ years of experience in software engineering with at least 2 years in a technical leadership role.
  • Proven expertise in Python development (Django, FastAPI, Flask, or equivalent).
  • Solid experience with AWS (ECS, Lambda, S3, CloudFormation, RDS or similar services).
  • Previous experience leading distributed or cross-cultural engineering teams.
  • Strong communication skills and ability to manage relationships with both internal and external stakeholders.
  • Demonstrated success delivering fintech systems (e.g., payment gateways, banking APIs, compliance tools).
  • Deep understanding of Agile/Scrum methodologies.
  • Fluent in English (written and spoken).

WHO WE ARE:

Volpis is a company of ambitious professionals providing Web & Mobile App Design and Development services for more than 9 years. Regularly listed in the Top IT Outsourcing Companies and Top Custom Software Development Companies on Clutch.co. Being a full-service company, we provide expertise in all phases of the software development life cycle. We’ve successfully covered more than 100 products all over the world. Together, we’ve created a dynamic, fun, inspiring environment where we can be ourselves and grow each day.

Required experience:

• 2 + years of commercial experience.

Required skills:

• Experience working with Golang;
• Strong knowledge of concurrency models and parallel computing;
• Experience with pointers and memory management;
• Experience working with Kafka, RabbitMQ;
• Knowledge of SQL and NoSQL databases ;
• Experience working with MongoDB, Mongoose, PostgreSQL, Redis ;
• Experience designing and developing APIs (REST) ;
• Experience in any cloud services AWS/ Heroku ;
• Software design skills, design patterns ;
• Microservices architecture, Monolith architecture;
• Familiarity with continuous integration and continuous deployment (CI/CD) pipelines;
• Solid knowledge of git;
• Upper-intermediate English level.

Would be a plus:

• Nest.js;
• Node.js.

Responsibilities:

• Support of existing applications;
• Develop projects from scratch;
• Delivering high-quality code.

Your Benefits:

• 15 days paid vacation + 5 public holidays;
• 7 days 100% paid sick leaves;
• Sport and health compensation;
• Flexible working hours;
• Corporate training (internal and external);
• IT Cluster membership;
• Personal Birthday and anniversary gifts;
• Сorporate parties and team-buildings;
• Company legal and accounting support.

Project Description:

We are looking for a strong Python Developer with database expertise to join a banking project. The role focuses on backend development, infrastructure as code, and cloud-based solutions within a regulated financial environment.

The ideal candidate combines hands-on development skills with solid database knowledge and understands the quality, security, and compliance standards required in enterprise banking systems.

Most Important: Python, Terraform, GCP
A plus is if: great SQL skills, experience with API Based Customer Search services/backends
German language (nice, but not needed)

Responsibilities:

Design and develop backend services using Python
Build and maintain infrastructure using Terraform
Develop and operate cloud-native solutions on GCP (Google Cloud Platform)
Work with relational databases (design, optimization, query tuning)
Implement secure, scalable, and maintainable solutions
Contribute to CI/CD pipelines and automation processes
Collaborate with architects, DevOps engineers, and business stakeholders
Ensure compliance with banking security and regulatory standards
Support production systems and participate in incident analysis when needed

Mandatory Skills Description:

Strong experience with Python (backend development, APIs, services)
Hands-on experience with Terraform (Infrastructure as Code)
Practical experience with GCP
Solid understanding of database systems and data modeling
Experience working in enterprise or regulated environments
Understanding of secure coding practices
Experience with Git-based workflows and CI/CD pipelines

Nice-to-Have Skills Description:

Advanced SQL skills (query optimization, performance tuning)
Experience with API-based Customer Search services or similar backend systems
Knowledge of RESTful API design principles
Experience with monitoring/logging tools
Experience in banking or financial services domain
German language skills (beneficial but not mandatory)
German Language

We are looking for a skilled Python Developer to join one of our projects on a full-time basis.

About the project: The client is from Norway. They are working on developing a product for the maritime industry. The product focuses on energy analysis for different sea transport (for example, fuel usage, greenhouse gas emissions, etc.).

Responsibilities:

• Design and develop new features in line with the product roadmap and detailed requirements.
• Write clean, efficient, and maintainable code, following best practices and coding standards.
• Maintain and evolve existing systems, including troubleshooting issues and modernizing technologies and architecture.
• Ensure the application meets performance, scalability, security, and reliability requirements.
• Conduct code reviews and contribute to the continuous improvement of development processes and code quality.
• Participate in architectural discussions, influence technical direction, and take ownership of tasks and deliverables.

Requirements:

• 5+ years of commercial experience as a Python Developer.
• Upper-Intermediate (B2) or higher level of English.
• Strong proficiency in Python.
• Experience with frameworks: Django, FastAPI, or others.
• Experience with database systems like PostgreSQL and MySQL.
• Hands-on experience with queue & message broker platforms like Kafka/RabbitMQ.
• Hands-on experience with CI/CD.
• Experience in container-based architecture and deployments (Docker, Kubernetes).
• Experience in writing unit tests, functional tests, and integration tests.
• Proficient in working with the version control system Git.
• Hands-on experience with AI coding tools.

Job details:

• Full-time.
• Fully remote.
• Long-term.
• B2B contract.
• Start date — April/beginning of May.

Stack: Node.js, Python, Go. 
Strong preference for candidates with experience in Mystery Box / CS Open Case platforms (or similar high-load random drop systems).

English B2+

We offer:

• Cooperation with a stable company with well-established processes and a positive atmosphere
• Experience in project management of different levels of complexity, methodology, and approaches
• Flexible schedule: Mon-Fri (8 hours a day)
• 18 days of paid vacation; 15 days sick leave
• A decent level of remuneration with regular reviews of the results of cooperation
• Extensive loyalty program 

Client

Our client is an international SaaS company developing tools that empower businesses to create highly engaging digital experiences. Their solutions are trusted by thousands of organizations worldwide to collect, analyze, and act on user data effectively.

Project overview

The project is an interactive form builder designed for marketers, researchers, HR, sales, and customer experience teams to create engaging, conversational online forms, surveys, and quizzes.

Key Features:
Visually appealing conversational design optimized for high completion rates;
AI-powered data interpretation;
Workflow and logic builders for personalized experiences;
Brand customization options;
Seamless integrations with various tools to automate data collection and streamline workflows.

Position overview

We are seeking a highly skilled Full Stack Developer with deep expertise in Golang (backend) and React/TypeScript (frontend). The ideal candidate will take ownership of the full development workflow—from understanding business requirements, creating tasks, writing and testing code, through deployment and monitoring. This role requires strong autonomy, proactive communication, and the ability to deliver reliable, scalable solutions in a modern cloud environment.

This position operates according to the CET time zone.

Responsibilities

• Design, develop, and maintain backend services using Golang and frontend applications using React/TypeScript.
• Collaborate with product managers, designers, and other engineers to translate business requirements into technical solutions.
• Implement event-driven architectures leveraging Kafka for real-time data processing.
• Manage and optimize AWS environments, ensuring scalability and reliability.
• Define and maintain infrastructure using Terraform and deploy services in Kubernetes clusters.
• Build and maintain CI/CD pipelines in Jenkins for automated deployments.
• Ensure high-quality code through comprehensive testing and code reviews.
• Integrate AI tools and APIs (Claude, AWS Bedrock, Copilot) to enhance product capabilities.
• Monitor application performance and troubleshoot issues in production environments.
• Contribute to UI/UX improvements and ensure seamless integration between frontend and backend.
• Communicate progress, challenges, and solutions effectively within the team.
   

Requirements
 

• Strong, in-depth knowledge of Golang
• Experience delivering complex backend systems from design to production
• Solid background with Kafka and event-driven architectures
• Hands-on experience managing AWS environments
• Proficiency with Terraform for infrastructure-as-code
• Knowledge of deploying and operating services in Kubernetes
• Building CI/CD pipelines in Jenkins
• Proven ability to ensure quality through comprehensive testing
• Strong proficiency in React and TypeScript
• Experience contributing to front-end features, UI components, and client-side logic
• Ability to seamlessly integrate frontend with backend services
   

Nice to have
 

• Familiarity with AI tools and APIs (Claude, AWS Bedrock, Copilot)
• Excellent English communication skills (written and spoken)
• Self-driven and able to work independently while managing workload effectively

TemaBit Fozzy Group is an IT company that develops unique solutions for more than 40 businesses of Fozzy Group. We specialize in web and mobile development, as well as software for managing business processes and infrastructure projects.

In addition, we experiment and care about the team and the Guest, we value cooperation, we preach honesty and openness.

You will play a key role in our engineering team by leading the design, development, and maintenance of high-quality applications. Your expertise in Backend (with focus on Cloud Native) and Frontend development, coupled with a solid understanding of backend architectures, will drive the creation of scalable, efficient, and secure software solutions. You will mentor other developers, contribute to architectural decisions, and ensure the delivery of robust applications that meet business needs.

Key Responsibilities:

• Lead the development of backend and frontend systems using .NET (with focus on Cloud Native development) and React JS, ensuring code quality, performance, and scalability
• Collaborate within cross-functional engineering team and with other teams to design and develop high-quality web applications
• Drive engineering excellence by adopting and following engineering best practices in your team
• Participate in the entire software development lifecycle, from concept to deployment
• Contribute to the architecture and implementation of scalable and efficient solutions
• Mentor junior and middle developers, guiding them through code reviews, and fostering a culture of continuous learning and improvement
• Define and promote best practices for using AI-assisted development tools (e.g., Claude Code, GitHub Copilot) to streamline coding, testing, documentation, and problem-solving

• Provide strategic guidance on how AI can enhance software development processes and overall team performance

   

Requirements:

• 5+ years of .NET development
• Proficiency in .NET 8+
• Proven experience with AI-assisted development tools and the ability to coach others on effective usage
• Experience of AWS Cloud Native development with focus on Serverless; familiarity with AWS services (i.e. Lambda, API Gateway, DynamoDB, S3, and EC2)
• Experience with Front End development using one of popular frameworks (React, Vue, Angular)
• Track record of implementing microservices based back-ends
• Strong knowledge of Entity Framework / EF Core / Dapper
• Deep understanding of DDD, Event Sourcing, CQRS
• Understanding of relational and non-relational databases
• Experience with xUnit or similar with testing frameworks
• Experience with containerization and orchestration technologies (Docker, Kubernetes)
• Understanding of Infrastructure as Code principle (experience with CDK will be a plus)
• Understanding of Agile/Scrum methodologies and experience working in an Agile environment
• Intermediate/B1 English Level, ability to read & write tech documentation

• Excellent communication & collaboration skills

   

Nice-to-have Skills & Experience:

• Experience with DynamoDB and PostgreSQL
• Experience building Gitlab CI/CD pipelines

• Successful mentoring experience

   

We propose:

• The ability to generate and influence decision-making
• Competitive salary discussed based on the results of the interview with the successful candidate
• Medical insurance
• Discounts for network employees
• Remote work mode, and if you want to work in the office — there is a cozy co-working space in the Silver Breeze business center (Kyiv)

About Us: Kebeta.ai is a deep-tech studio that builds custom AI solutions beyond generic APIs. We specialize in NLP, Knowledge Graphs, and Deep Reinforcement Learning in domains like Media, Autonomous Trading, Tourism, etc.
About Project: An application that brings AI into highly specialized professional fields, enabling them to benefit from the latest cutting-edge advancements.
We are currently looking for a talented Python Developer for our team. 

Requirements:

 ● Over 3 years of experience and strong knowledge of Python 3.9+, including multiprocessing and asyncio; 

 ● Hands-on experience with FastAPI and Pydantic for building web services;

 ● Solid understanding of SQLAlchemy and ORM concepts;

 ● Proficiency in Pandas for data analysis;

 ● Basic knowledge of NumPy and understanding of the vectorization concept;

 ● Experience with data visualization using matplotlib and plotly;

 ● Good understanding of data structures;

 ● Knowledge of relational databases and SQL;

 ● Experience working with PostgreSQL;

 ● Understanding of web services architecture and integration standards;

 ● Experience in developing and documenting REST APIs, including Swagger;

 ● English — Intermediate level;

 Will be plus:

 ● Understanding of prompting / interaction concepts with LLMs like ChatGPT, LLama, etc;

 ● More advanced understanding of Numpy and how math translates into code;

 ● Knowledge of “Fast App Builders” like Streamlit or Jupyter.

 Key Responsibilities:

 ● Design separate components, modules, classes etc;

 ● Code, debug, document, and maintain portions of software;

 ● Participate in peer code and design reviews;

 ● Participate in estimation and planning sessions;

 ● Contribute to development of technical project documentation and user documentation;

 ● Provide assistance to test engineers and support personnel in solving technical issues of software installation and its operation;

 ● Participate in conference calls and face-to-face meetings;

 ● Spot current deficiencies in the development process, adopted procedures and engineering practices, environment configurations, etc., and suggest improvements;

 ● Escalate technical issues to the Architect, Team Lead and Project Manage.

 Location: Ukraine: remote.

 We offer:

 ● The ability to focus on your work: a lack of bureaucracy and micromanagement;

 ● Competitive compensation depending on skills and experience level;

 ● Ability to learn new technological stacks, which help you to grow professionally and advance your career;

 ● Friendly atmosphere, concern for the comfort of specialists;

 ● English lessons;

 ● Flexible schedule depends on project’s needs;

 ● 15 working days of vacation;

 ● 12 working days per year are allowed to be “no show days” due to personal reasons.

 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.

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, Express-like framework;
- Hands-on experience creating robust RESTful API’s and designing scalable back-end architecture;
- Proficiency with relational DB;
- Experience with integration with 3rd party REST and SOAP API's;
- Good knowledge of GIT;
- Experience delivering projects, using modern tools like CircleCI, Docker, Kubernetes and navigating through different environments like AWS, GCP.
- Good understanding of ECMAScript specifications;
- Proficient in the English language.


Additional (good-to-have) skills:

- Experience with MySQL, nginx, Stripe, Twilio, Redis
- Experience working in a product company rather than outsourcing.


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 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

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