Jobs Backend

NerdySoft is looking for a Senior/Lead .NET Engineer to join our mission of building an innovative financial technology platform used by global institutions.

Requirements:

• 5+ years of commercial experience with the .NET platform (C#);
• Proficiency with C# 9–10, .NET 6–8;
• Experience working with databases: Azure SQL, Cosmos DB, PostgreSQL;
• Automated testing (functional, performance, resiliency);
• Good understanding of microservice architecture;
• Practical skills with serverless solutions (Azure Functions, Azure Container Apps);
• Messaging systems (Azure Service Bus, Event Grid, Event Hub);
• Working knowledge of Infrastructure as Code (Terraform, Helm);
• Secure coding;
• Cloud computing expertise (preferably Azure);
• Understanding of event-driven architecture;
• Experience in building integration solutions with external systems;
• Experience in financial services / FinTech domain;
• Ability to mentor less experienced engineers;
• ​​Strong communication skills;
• English level — B2+.

Nice to have:

• Experience of threat modelling;
• Any knowledge/experience working on globally distributed systems.

Responsibilities:

• Design, develop and deliver new product services, as well as enhance existing platform components;
• Work within one of our engineering teams to develop a cloud-native fintech platform used by global financial institutions;
• Contribute to architectural and technical decisions, ensuring scalability, performance, and security;
• Take ownership of the full development lifecycle — from design and implementation to production monitoring and support;
• Work as part of one of the client’s engineering teams to deliver iterative value while staying aligned with long-term product goals;
• Mentor and support less experienced engineers, sharing knowledge and improving engineering standards.

We offer:

• Comfortable workplace and modern office facilities;
• Flexible working hours with no overtime and the ability to work remotely;
• Regular salary review based on employee performance;
• 50% compensation for certifications, conferences, training, and other working events;
• 50% compensation for English courses;
• 18 working days of annual paid (and additional days of leave for company loyalty);
• Paid sick leaves;
• Medical insurance and sports compensation;
• And much more!

A fast-growing product company is looking for a Python Engineer (AI/ML) to join its Warsaw-based team.

This role sits at the intersection of AI systems, scalable backend engineering, and data infrastructure. It’s a great match for someone who enjoys building distributed systems and working on real production-grade AI pipelines — not just experiments.

What’s offered:

• stock options
• annual performance bonus
• medical insurance
• 20 paid vacation days
• work equipment
• office perks (lunch, parking, sports card)

What you’ll be working on:

You will develop services for AI lifecycle management and orchestration while building and maintaining scalable data pipelines for collection, processing, and validation. The role also involves contributing to distributed microservices architecture, monitoring systems, and collaborating with cross-functional teams in a cloud environment.

Must have

• 4+ years of commercial experience with Python
• Strong hands-on experience with Flask
• Experience with microservices architecture
• Solid experience with NoSQL + relational databases

We are looking for a candidate for the position of Middle Java Developer with strong skills to join a project with a Ukrainian telecom operator.

Requirements:

— 4 or more years of commercial experience in Java

— Strong knowledge of OOP, Design patterns

— Solid knowledge of Java Core (Java 17), including memory model, collections, streams, generics, multithreading

— Spring framework (Boot, Web, Data, Security), including Async

— REST API

— ORM Hibernate

— SQL (MariaDB, Oracle)

— Maven, Gradle

— Team player with good communication skills

— Technical English

— Higher technical education

Would be a plus:

— Experience with Docker

— Basic Linux and Bash

— Profiling tools, thread dumps, understanding thread states

— Experience with Mockito, JUnit, Mockservers, Testcontainers (mock vs spy)

— Kafka

— CI/CD (Git, Gitlab, Artifactory)

— Jira and Confluence

— Understanding of idempotency in APIs

Job Responsibilities:

— Development and support of microservices

— Writing unit tests

— Troubleshooting using logs, dumps, and profilers

Requirements:

Bachelor’s degree
At least 3 years of commercial experience with C#
Knowledge of the basics of computer science (algorithms and data structures, OOP)
Intermediate English level
Source code (all or fragments) of any C# project for evaluation
Will be a big plus:

Knowledge or experience in medical technology, DICOM
Have web and/or cloud development experience
Basic knowledge of C ++

We offer:

20 days of paid vacation
15 days of paid sick leave
Accounting support
Comfortable, modern office (Kyiv/Kharkiv) and working environment
Flexible working schedule
Corporate events
English classes
Paid conferences

Responsibilities:

Writing automation scripts
Bug-fixing
Writing unit tests
Developing new features or extending existing ones

*Project*: Development of software for medical equipment for imaging. Development of scanners of an internationally well-known brand, by which more than 300,000 patients are examined daily. This area comprises software running both on the scanners and workstations, as well as the integration to other vendors covering:
* Installation and software licensing management
* Connectivity configuration and diagnostics
* Patient data management
* Integration to hospital IT systems (EMRs, PACS) and other 3rd party systems (reporting systems)
* Reading other vendors’ images that are complying with the DICOM standard
* Remote access solutions for review and report
* Ensuring privacy and security of patients’ data

Technologies
— C++/C# .Net
— WPF
— MFC
— Databases
— Network communication
— DICOM standard (Digital Imaging and Communication in Medicine)
— VS 2022, Jira, Jenkins, Confluence, Teams

We’re looking for a Backend Engineer (Node.js with Go experience) to grow the server-side of a product for a US-based end client: build new functionality, improve service stability, quickly identify and fix bugs, and ensure reliable data exchange between clients and the server.

Tech split: Node.js (~90%), Go (~10%).

About the role & product

• Core backend stack: Node.js + TypeScript
• Additional: Golang — you should know it and be ready to occasionally write/maintain Go code.
• Database: PostgreSQL
• Infrastructure: AWS (strong familiarity required)

• Communication/IoT: MQTT

  Important: “IoT” here is not about thousands of devices. Think of it as a communication channel between one mobile client, one TV/device, and our server.

• Client requirement (must-have): using the customer-provided Claude (AI) as part of the development process.

Key responsibilities

• Backend development in Node.js/TypeScript (new features + maintenance of existing code).
• Occasional work on Golang components (smaller share, but you should be comfortable with it).
• Bug fixing, troubleshooting, and incident handling (when needed).
• Testing: writing/maintaining tests, validating changes before releases.
• Working with PostgreSQL (queries, optimization, data integrity).
• Working with AWS (deployments/services/environments depending on the current setup).
• Using Claude in daily development (e.g., analysis, preparing changes, reviews, documentation) in line with the client’s guidelines.

Requirements

• Commercial experience in backend development with Node.js and TypeScript.
• Strong understanding and hands-on experience with PostgreSQL.
• AWS: confident knowledge (ability to work with cloud environments and understand common services and approaches).
• Solid basic Golang skills (read/fix/write small parts).
• Experience with or readiness to work with MQTT / message-driven communication.
• Good spoken English (US client).

NerdySoft is looking for a Senior/Lead .NET Engineer to join our mission of building an innovative financial technology platform used by global institutions.

Requirements:

• 5+ years of commercial experience with the .NET platform (C#);
• Proficiency with C# 9–10, .NET 6–8;
• Experience working with databases: Azure SQL, Cosmos DB, PostgreSQL;
• Automated testing (functional, performance, resiliency);
• Good understanding of microservice architecture;
• Practical skills with serverless solutions (Azure Functions, Azure Container Apps);
• Messaging systems (Azure Service Bus, Event Grid, Event Hub);
• Working knowledge of Infrastructure as Code (Terraform, Helm);
• Secure coding;
• Cloud computing expertise (preferably Azure);
• Understanding of event-driven architecture;
• Experience in building integration solutions with external systems;
• FinTech background is mandatory;
• Ability to mentor less experienced engineers;
• ​​Strong communication skills;
• English level — B2+.

Nice to have:

• Experience of threat modelling;
• Any knowledge/experience working on globally distributed systems.

Responsibilities:

• Design, develop and deliver new product services, as well as enhance existing platform components;
• Work within one of our engineering teams to develop a cloud-native fintech platform used by global financial institutions;
• Contribute to architectural and technical decisions, ensuring scalability, performance, and security;
• Take ownership of the full development lifecycle — from design and implementation to production monitoring and support;
• Work as part of one of the client’s engineering teams to deliver iterative value while staying aligned with long-term product goals;

• Mentor and support less experienced engineers, sharing knowledge and improving engineering standards.

   

We offer:

• Comfortable workplace and modern office facilities;
• Flexible working hours with no overtime and the ability to work remotely;
• Regular salary review based on employee performance;
• 50% compensation for certifications, conferences, training, and other working events;
• 50% compensation for English courses;
• 18 working days of annual paid (and additional days of leave for company loyalty);
• Paid sick leaves;
• Medical insurance and sports compensation;
• And much more!

New long-term project for an Energy client, where we will create a microservice platform to support various business cases. You will be part of a team, where we’ll have C# engineers, AQAs, POs, and Scrum Masters.

Requirements:

• 5+ years of experience as .Net developer. At least 2 years as a Lead developer 
• Proven experience in working with architects from the client-side
• Proven experience with Azure, Azure DevOps
• Proven experience working on a microservice-based project
• Ability to mentor mid-junior engineers
• OOP Development, Design Patterns, Best Practices
• Good English to work with clients directly

Job responsibilities:

• Strong problem-solving and follow-up skills; must be proactive and take initiative
• Professionalism and ability to maintain the highest level of confidentiality
• Create robust code and translate business logic into project requirements
• Develop code using development best practices, and an emphasis on security best practices
• Leverage technologies to support business needs to attain high reusability and maintainability of current and newly developed systems
• Provide system design recommendations based on technical requirements
• Work independently on development tasks with a minimal amount of supervision
• Write effective unit tests and integration tests to ensure high-quality software delivery
• Support Lead, Scrum Master and PO

New long-term project for an Energy client, where we will create a microservice platform to support various business cases. You will be part of a team, where we’ll have C# engineers, AQAs, POs, and Scrum Masters.

Requirements:

• 4+ years of experience as .Net developer. 
• Proven experience in working with architects from the client-side
• Proven experience with Azure, Azure DevOps
• Proven experience working on a microservice-based project
• Ability to mentor mid-junior engineers
• OOP Development, Design Patterns, Best Practices
• Good English to work with clients directly

Job responsibilities:

• Strong problem-solving and follow-up skills; must be proactive and take initiative
• Professionalism and ability to maintain the highest level of confidentiality
• Create robust code and translate business logic into project requirements
• Develop code using development best practices, and an emphasis on security best practices
• Leverage technologies to support business needs to attain high reusability and maintainability of current and newly developed systems
• Provide system design recommendations based on technical requirements
• Work independently on development tasks with a minimal amount of supervision
• Write effective unit tests and integration tests to ensure high-quality software delivery
• Support Lead, Scrum Master and PO

Bliscore is building a talent pool of Middle .NET / React Engineers for upcoming web projects.

We’re looking for engineers who combine strong backend expertise with solid frontend skills and are ready to take ownership of features in growing B2B products.

• Stack: .NET 8, React, TypeScript, PostgreSQL, Azure, Docker.
• Type: Long-term product-focused development.
• Setup: Hybrid (Lviv) or remote.

Your day-to-day tasks will include:

• Developing Estimation Engines: Building backend logic in .NET to handle multi-currency calculations, resource loading, and project timelines.
• Dynamic UI Components: Using React and TypeScript to build complex "Estimation Builders" where users drag-and-drop tasks to see real-time budget updates.
• Data Visualization: Implementing charts and progress bars to help managers visualize project health.
• Database Management: Optimizing PostgreSQL queries to handle large sets of historical estimation data.

• Feature Ownership: Taking a task from a Jira ticket to a production-ready feature through code reviews and CI/CD.

   

What’s in it for you (Perks & Benefits):

• Single Product: No outsourcing. You work on one codebase and see the long-term results of your decisions.
• Support: You’ll have a lead to consult with and a clear plan for your next salary/level review.
• Lviv & Remote: We have a modern office in Lviv (with paid lunches), but you’re free to work from home.
• High-End Tech: We provide a powerful laptop and any extra equipment you need.
• Rest: 18 vacation days + 10 personal days off + 5 sick leaves.
• Education: We pay for your professional courses and certifications.
• Support: Full accounting support. We handle the taxes, you get the salary.

Hiring Process :

1. Intro Call with Recruiter (15-30 min) 📞
2. Technical Task (1-1.5 hours) 💻
3. Technical Interview with Tech Lead (1 hour) 🤝

Boosty Labs is a premier blockchain development company with broad technical expertise and over 150 highly skilled developers and strategists. Founded in 2017, Boosty Labs has completed 250+ projects and collaborated with numerous industry giants.
Join us as a Senior Blockchain Engineer — Node.js+solidity

Requirements:

Backend part

• Strong Node.js / TypeScript experience (NestJS preferred).
• Experience building high-frequency bots that interact with blockchain.
• Understanding of RPC optimization and multicall strategies to handle millions of calls/day.
• Experience with async error handling, retries, and observability.

• Familiarity with transaction building and gas optimization for automated operations.

   

Blockchain part

• Strong understanding of Solidity smart contracts.
• Experience with contract state reading: callStatic, view functions, and event logs.
• Ability to trace calls and debug contract interactions (using tools like Foundry, Tenderly, or Etherscan traces).
•  Knowledge of DeFi primitives: vaults, lending/borrowing, swaps, collateralization.
• Ability to write efficient contract interaction logic (batching, multicall, caching).

What we offer:

• Remote working format
• Flexible working hours
• Informal and friendly atmosphere
• The ability to focus on your work: a lack of bureaucracy and micromanagement
• 20 paid vacation days
• 7 paid sick leaves
• Education reimbursement
• Free English classes
• Psychologist consultations

Recruimet process: Recruitment Interview - Techncial Interview - Client Interview

Build the core engine of a regulated digital asset platform.
 

We’re building a next-generation, regulated crypto platform focused on fiat on/off-ramps and Spot trading. Unlike many crypto startups, we are not experimenting - we are building a production-grade, compliant system designed for scale, auditability, and long-term growth.

As a Backend Engineer, you won’t be maintaining legacy APIs or writing simple CRUD endpoints. You’ll design and build the financial core of the platform - the services responsible for trading, ledger integrity, wallet management, and integrations with global providers.

Our stack is modern. Our architecture is clean. Our ambition is serious.

Responsibilities

• Designing and developing backend services (API-first architecture)
• Building trading, wallet, and ledger modules
• Integrating with OKX (REST/WebSocket), Fireblocks, Sumsub, and banking connectors
• Ensuring transactional integrity and financial correctness
• Implementing authentication, MFA, session management
• Creating audit logs and compliance-ready flows
• Writing clean, testable, maintainable TypeScript code
• Participating in architecture discussions and technical decisions
  
   

Your Role

• As a Senior Backend Engineer, you’ll:
• Design modular backend services in Node.js & TypeScript
• Build a high-integrity double-entry ledger system
• Implement trading order lifecycle (validation → routing → fills → reconciliation)
• Develop exchange adapters (OKX first, more later)
• Ensure idempotency for all financial operations
• Implement Redis-based quote locking for conversions
• Support mobile-first API architecture (versioned, backward compatible)
• Collaborate with frontend and mobile teams
• Contribute to infrastructure and deployment decisions
• You will own meaningful parts of the system - not just tickets.

Requirements

• 3+ years of backend development experience
• Strong Node.js and TypeScript expertise
• Experience with relational databases (PostgreSQL or similar)
• Understanding of transactions, concurrency, idempotency
• Experience integrating third-party APIs
• Knowledge of Redis and caching strategies
• Experience building secure authentication systems (JWT, refresh tokens, MFA)
• Strong communication skills in English (B2+)

Will be a plus

• Experience in FinTech / crypto / trading platforms
• Familiarity with exchange APIs (OKX, Binance, etc.)
• Experience building financial ledger systems
• Knowledge of message queues (Kafka, RabbitMQ, SQS)
• Experience with cloud infrastructure (AWS preferred)
• Understanding of reconciliation processes in financial systems
• Experience building Admin panels with RBAC

We Offer

• Office, Hybrid –  flexible hours
• Collaborate with top-tier clients
• 18+4 paid days off, no matter your contract
• Lawyer Services
• Accounting Support
• MacBook Pro + premium tools
• Annual learning budget (including GenAI courses or conferences)
• Career growth path
• Projects with visible, real-world impa

Project Description
We are transforming our fleet management platform and data processing infrastructure from a monolithic application to a modern, event-driven microservices architecture. This includes shifting from a tightly coupled relational database to a scalable, multi-tenant event stream platform and Kubernetes operators development.

Job Description

• We are looking for a strong Senior Backend Engineer to help evolve our platform into a multi-tenant, event-driven architecture.
• You can come from any mature backend background (Java, .NET, Node.js, Rust, Python, etc.), but you must be willing to switch to Go, as our backend services are developed in Go.
   Prior Go experience is not required, but you need to be comfortable ramping up quickly and writing production-grade Go code.
• The core requirement is strong distributed-systems expertise and hands-on experience with event-streaming technologies such as Pulsar or Kafka.

Experience Level: 5+ years of backend engineering

Responsibilities

• Design and maintain distributed microservices (Go-based environment).
• Work with event-streaming systems such as Apache Pulsar or Kafka.
• Deploy and operate services in Kubernetes across cloud environments.
• Ensure observability: logs, metrics, tracing, and reliability.
• Participate in architecture discussions, code reviews, and performance optimization.
• Collaborate with Data Engineering, Platform, and DevOps teams.

Requirements

Core Backend Skills

• 5+ years of backend development in any production language: Java, .NET, Node.js, Python, Rust, Elixir, Ruby, etc.
• Strong experience with event-driven systems: Apache Pulsar, Kafka or similar.
• Experience designing and maintaining distributed microservices.
• Solid understanding of concurrency, scalability, and high-throughput system design.

• Willingness to adopt Go as the primary language for the project.

   

  Cloud & Deployment

• Practical experience with Kubernetes operators, CRDs, and Helm.

• Understanding of cloud CI/CD systems and delivery pipelines (GitHub Actions).

  Data

• Experience with PostgreSQL and Redis.
• Understanding of Data Engineering concepts, including ETL/ELT and streaming workflows.

Nice to Have

• Experience with Go (Golang).
• Experience with C/C++ (networking, concurrency, high-performance systems).
• Experience with observability stacks: Prometheus, Grafana, OpenTelemetry.
• Experience building multi-tenant architectures.
• Python experience for data workflows.

Job Description

• 4+ years of experience as .Net developer. 
• Proven experience in working with architects from the client-side
• Proven experience with Azure, Azure DevOps
• Proven experience working on a microservice-based project
• Ability to mentor mid-junior engineers
• OOP Development, Design Patterns, Best Practices
• Good English to work with clients directly

Job Responsibilities

• Strong problem-solving and follow-up skills; must be proactive and take initiative
• Professionalism and ability to maintain the highest level of confidentiality
• Create robust code and translate business logic into project requirements
• Develop code using development best practices, and an emphasis on security best practices
• Leverage technologies to support business needs to attain high reusability and maintainability of current and newly developed systems
• Provide system design recommendations based on technical requirements
• Work independently on development tasks with a minimal amount of supervision
• Write effective unit tests and integration tests to ensure high-quality software delivery
• Support Lead, Scrum Master and PO

Department/Project Description

New long-term project for an Energy client, where we will create a microservice platform to support various business cases. You will be part of a team, where we'll have C# engineers, AQAs, POs, and Scrum Masters.

Skill Category

.NET

Keyskills - Must Have

• C#
• .NET

Looking for a Middle/Middle Strong Fullstack Java Developer to join our team. We are building a platform for fast and convenient purchase of tickets for various music and sport events. Users are provided access to a wide selection of concerts where they can find performances by their favorite artists, review event dates and locations, and buy tickets in real-time.

Requirements:

• 3+ years of experience in Java development.
• 2+ years of Spring framework and building Spring web applications.
• Understanding and experience developing and deploying microservices.
• Experience developing integration layers (using REST interfaces, OpenApi, Kafka, GraphQL).
• Commercial experience with frontend development (e.g., React, Angular, or similar frameworks).
• Excellent design, coding, and debugging skills.
• OOP, OOD, Design Patterns proficient.
• Knowledge of relational databases (preferably PostgreSQL).
• Experience with Docker.
• English — at least an Upper-Intermediate level.

Nice to have skills:

• Knowledge of non-relational databases.
• Experience in developing multi-threaded applications.
• Experience with AWS services (ECS, Lambda, Aurora).

Responsibilities:

• Produce code using Java best practices.
• Write unit tests and code that adheres to coding standards.
• Provide technical support.
• Work both independently and in close collaboration with others in the team; effectively communicate with geographically distributed team members.
• Make recommendations for the improvement of the system and development process to increase productivity.
• Identify, monitor, and resolve project-related issues.

Interview stages:

• HR-interview (30 minutes).
• Technical interview (1 hour).
• Interview with the customer (1 hour).
• Job offer🎉🎉🎉

We offer:

• Competitive salary + bonuses.
• Challenging tasks and projects.
• Personal growth.
• Flexible working hours.
• New hardware.
• Free English lessons.
• Availability of generators and Starlinks in the office.
• Small gym and table tennis in the office.
• Adjustable height tables.
• Regular office fruit delivery and other benefits.

Let’s create value together!

Looking for a Junior Strong Fullstack Java Developer to join our team. We are building a platform for fast and convenient purchase of tickets for various music and sport events. Users are provided access to a wide selection of concerts where they can find performances by their favorite artists, review event dates and locations, and buy tickets in real-time.

Requirements:

• 1.5+ years of experience in Java development.
• 1.5+ years of Spring framework and building Spring web applications.
• Understanding and experience developing and deploying microservices.
• Experience developing integration layers (using REST interfaces, OpenApi, Kafka, GraphQL).
• Commercial experience with frontend development (e.g., React, Angular, or similar frameworks).
• Excellent design, coding, and debugging skills.
• OOP, OOD, Design Patterns proficient.
• Knowledge of relational databases (preferably PostgreSQL).
• Experience with Docker.
• English — at least an Upper-Intermediate level.

Nice to have skills:

• Knowledge of non-relational databases.
• Experience in developing multi-threaded applications.
• Experience with AWS services (ECS, Lambda, Aurora).

Responsibilities:

• Produce code using Java best practices.
• Write unit tests and code that adheres to coding standards.
• Provide technical support.
• Work both independently and in close collaboration with others in the team; effectively communicate with geographically distributed team members.
• Make recommendations for the improvement of the system and development process to increase productivity.
• Identify, monitor, and resolve project-related issues.

Interview stages:

• HR-interview (30 minutes).
• Technical interview (1 hour).
• Interview with the customer (1 hour).
• Job offer🎉🎉🎉

We offer:

• Competitive salary + bonuses.
• Challenging tasks and projects.
• Personal growth.
• Flexible working hours.
• New hardware.
• Free English lessons.
• Availability of generators and Starlinks in the office.
• Small gym and table tennis in the office.
• Adjustable height tables.
• Regular office fruit delivery and other benefits.

Let’s create value together!