Visarsoft

We are looking for a Lead Backend Developer to architect and own the backend infrastructure of our fintech platform. You will design scalable microservices, manage critical data flows, and ensure system reliability at scale. Work directly with product, design, and business stakeholders to translate requirements into robust backend systems.

What You Will Do
Backend Architecture & Design

• Own the backend architecture end-to-end across microservices.
• Design and implement Node.js / Express services handling 20M+ transactions monthly.
• Architect PostgreSQL schemas for reliability and performance at scale.
• Define API contracts (GraphQL, REST) that support frontend and partner integrations.
• Make critical decisions on data consistency, caching, and async patterns.

Microservices & System Design

• Build and maintain multiple Node.js / Express microservices with clear ownership boundaries.
• Implement webhook-driven workflows and event-driven architecture.
• Design and implement real-time data synchronization pipelines.
• Manage message queues (RabbitMQ) for async operations and inter-service communication.
• Ensure row-level security (RLS) and multi-tenant data isolation at the database layer.

Data & Performance

• Design and optimize PostgreSQL schemas using Prisma ORM.
• Write complex queries, manage indexes, and ensure query performance.
• Implement caching strategies and data consistency patterns.
• Build audit trails and changelog tracking for compliance and debugging.
• Handle sensitive data (KYC, AML, financial records) with security-first approach.

Integration & Third-Party Services

• Integrate with external services (KYC providers, document verification, acquiring networks).
• Design and maintain API integrations with payment processors and clearing centers.
• Build robust error handling and retry logic for critical integrations.
• Document APIs and maintain SDK/integration guides for partners.
Communication & Leadership

• Work directly with product managers and stakeholders to clarify backend requirements.
• Proactively flag technical risks, propose solutions, and keep stakeholders informed.
• Give technical feedback on product feasibility and scalability implications.
• Lead backend code reviews with focus on quality, performance, and knowledge sharing.
• Mentor junior developers and foster backend engineering best practices.

What We Are Looking For
Core Requirements:

• 5–7 years of production experience in Node.js backend development.
• Strong TypeScript across the entire stack (no JavaScript-only experience).
• PostgreSQL expertise: schema design, optimization, transactions, advanced queries.
• Prisma ORM or similar ORMs and hands-on experience with relational databases.
• GraphQL schema design and resolver implementation (REST a plus).
• Microservices architecture: designing boundaries, managing state, async communication.
• RabbitMQ or similar message brokers; event-driven architecture patterns.
• Experience with fintech, payments, or regulated financial products.
• Strong communication skills and comfort working directly with non-technical stakeholders.

Nice to Have:

• Distributed systems experience (eventual consistency, saga patterns, consensus).
• gRPC for service-to-service communication.
• Experience scaling to 100K+ users and handling high transaction volume.
• Background in AML/KYC compliance or financial data handling.
• DevOps sensibility: monitoring, logging, deployment pipelines.
• Experience mentoring backend teams.

Tech Stack
Core: Node.js, Express, TypeScript, PostgreSQL, Prisma ORM, GraphQL, RabbitMQ, gRPC
Supporting: REST APIs, Webhooks, Real-time data sync, Multi-tenant architecture, Audit logging

What We Offer

• Full backend ownership and architectural control.
• Work on systems handling millions of transactions and 100K+ merchants.
• Direct access to product and business stakeholders.
• Modern microservices stack with no legacy debt.
• AI-friendly engineering culture—we embrace tools that make you more effective.
• Deep fintech learning: multi-partner networks, compliance, payment flows.
• Competitive compensation and benefits package.

We are looking for a Lead Backend Developer to architect and own the backend infrastructure of our fintech platform. You will design scalable microservices, manage critical data flows, and ensure system reliability at scale. Work directly with product, design, and business stakeholders to translate requirements into robust backend systems. 

This is a hybrid role, and we are currently considering candidates based in Lviv (Ukraine). 

Fully remote work is not an option for this position.

What You Will Do
Backend Architecture & Design

• Own the backend architecture end-to-end across microservices.
• Design and implement Node.js / Express services handling 20M+ transactions monthly.
• Architect PostgreSQL schemas for reliability and performance at scale.
• Define API contracts (GraphQL, REST) that support frontend and partner integrations.
• Make critical decisions on data consistency, caching, and async patterns.

Microservices & System Design

• Build and maintain multiple Node.js / Express microservices with clear ownership boundaries.
• Implement webhook-driven workflows and event-driven architecture.
• Design and implement real-time data synchronization pipelines.
• Manage message queues (RabbitMQ) for async operations and inter-service communication.
• Ensure row-level security (RLS) and multi-tenant data isolation at the database layer.

Data & Performance

• Design and optimize PostgreSQL schemas using Prisma ORM.
• Write complex queries, manage indexes, and ensure query performance.
• Implement caching strategies and data consistency patterns.
• Build audit trails and changelog tracking for compliance and debugging.
• Handle sensitive data (KYC, AML, financial records) with security-first approach.

Integration & Third-Party Services

• Integrate with external services (KYC providers, document verification, acquiring networks).
• Design and maintain API integrations with payment processors and clearing centers.
• Build robust error handling and retry logic for critical integrations.
• Document APIs and maintain SDK/integration guides for partners.
Communication & Leadership

• Work directly with product managers and stakeholders to clarify backend requirements.
• Proactively flag technical risks, propose solutions, and keep stakeholders informed.
• Give technical feedback on product feasibility and scalability implications.
• Lead backend code reviews with focus on quality, performance, and knowledge sharing.
• Mentor junior developers and foster backend engineering best practices.

What We Are Looking For
Core Requirements:

• 5–7 years of production experience in Node.js backend development.
• Strong TypeScript across the entire stack (no JavaScript-only experience).
• PostgreSQL expertise: schema design, optimization, transactions, advanced queries.
• Prisma ORM or similar ORMs and hands-on experience with relational databases.
• GraphQL schema design and resolver implementation (REST a plus).
• Microservices architecture: designing boundaries, managing state, async communication.
• RabbitMQ or similar message brokers; event-driven architecture patterns.
• Experience with fintech, payments, or regulated financial products.
• Strong communication skills and comfort working directly with non-technical stakeholders.

Nice to Have:

• Distributed systems experience (eventual consistency, saga patterns, consensus).
• gRPC for service-to-service communication.
• Experience scaling to 100K+ users and handling high transaction volume.
• Background in AML/KYC compliance or financial data handling.
• DevOps sensibility: monitoring, logging, deployment pipelines.
• Experience mentoring backend teams.

Tech Stack
Core: Node.js, Express, TypeScript, PostgreSQL, Prisma ORM, GraphQL, RabbitMQ, gRPC
Supporting: REST APIs, Webhooks, Real-time data sync, Multi-tenant architecture, Audit logging

What We Offer

• Full backend ownership and architectural control.
• Work on systems handling millions of transactions and 100K+ merchants.
• Direct access to product and business stakeholders.
• Modern microservices stack with no legacy debt.
• AI-friendly engineering culture—we embrace tools that make you more effective.
• Deep fintech learning: multi-partner networks, compliance, payment flows.
• Competitive compensation and benefits package.

We are looking for an experienced Software Engineer / AI & Data Platform Engineer (m/f/x) to join an international project focused on developing modern software applications, AI solutions and scalable data platforms for cutting-edge battery research.

This is not a pure Data Engineering role. We are looking for a strong Software Engineer with solid Data Engineering experience, excellent Python skills and a genuine passion for AI, cloud-native development and modern software engineering.

Responsibilities

- Develop modern software applications in Python.

- Build and maintain scalable batch and streaming data pipelines using Databricks, PySpark and SQL.

- Work with the Azure Data Stack, including Azure Data Factory, ADLS Gen2 and Event Hubs.

- Develop AI-powered solutions using LLMs, RAG, AI Agents and MCP.

- Contribute to reliable, secure and observable cloud-native applications and data platforms.

- Apply modern software engineering and DevOps practices.

- Work closely with an international team.

Requirements

- Several years of experience as a Software Engineer.

- Strong experience developing production-ready applications in Python.

- Hands-on experience with Databricks, PySpark and SQL.

- Experience building batch and streaming data pipelines using the Medallion Architecture (Bronze / Silver / Gold).

- Experience with Azure Data Factory, ADLS Gen2 and Event Hubs.

- Experience with AWS-based data platforms is also welcome.

- Practical experience developing AI-powered solutions using LLMs, RAG, AI Agents or MCP.

- Good understanding of classical Machine Learning concepts.

- Experience building reliable, secure and observable cloud-native applications and data platforms.

- Experience working with modern software engineering and DevOps practices.

- Proactive, self-driven mindset with excellent problem-solving skills and the ability to work independently in an international environment.

Nice to Have

- FastAPI

- Uvicorn

- Databricks Apps

- Databricks Asset Bundles

- MQTT

- Azure Event Hubs or other event-driven architectures

- Experience in scientific, industrial or manufacturing environments, ideally within R&D.

Tech Stack

• Python
• Databricks
• PySpark
• SQL
• Azure Data Factory
• Azure Data Lake Storage Gen2 (ADLS Gen2)
• Azure Event Hubs
• Azure
• AWS
• LLM
• RAG
• AI Agents
• MCP
• Machine Learning
• FastAPI
• Uvicorn
• GitLab CI/CD

• MQTT

   

Project Details

- Start: ASAP

- Duration: Initial 2 months (extension very likely)

- Location: 100% remote after an initial 1-week onsite onboarding in the Greater Frankfurt area

- Workload: Full-time

- Language: English (German preferred)

Important

- Ability to work onsite in the Greater Frankfurt area during the initial one-week onboarding is required.

- Candidates with 5+ years of professional experience are preferred.

We are looking for an experienced Senior DevOps / Observability Engineer to join a long-term international project focused on building a modern observability platform for enterprise-scale applications.

You will play a key role in implementing OpenTelemetry across distributed systems, improving monitoring capabilities, and helping engineering teams build reliable, observable production environments.

This is a hands-on engineering position for someone with deep expertise in OpenTelemetry, distributed tracing, Azure monitoring, and production observability.

Responsibilities

• Design and implement observability solutions using OpenTelemetry.
• Instrument .NET applications with OpenTelemetry.
• Instrument Angular frontend applications for distributed tracing.
• Implement end-to-end tracing across frontend, backend, APIs, messaging systems, and databases.
• Build and improve metrics, traces, and centralized logging.
• Configure and optimize Azure Application Insights.
• Configure and optimize Datadog monitoring.
• Create production dashboards and monitoring visualizations.
• Design alerting strategies and incident detection.
• Improve monitoring reliability, performance, and operational visibility.
• Collaborate closely with software engineers and architects.
• Help define observability standards and best practices.
• Support production troubleshooting and performance analysis.

• Share knowledge with customer engineering teams.

   

Requirements

Must have

• 5+ years of experience as DevOps, SRE, Platform, or Observability Engineer.
• Strong commercial experience with OpenTelemetry.
• Production experience instrumenting .NET applications.
• Experience instrumenting Angular applications.
• Strong knowledge of distributed tracing.
• Experience working with:
  • Azure Application Insights
  • Datadog
• Experience building:
  • Dashboards
  • Alerts
  • Monitoring solutions
• Experience troubleshooting distributed systems.
• Understanding of metrics, traces, and logs.
• Experience with cloud environments.
• Good understanding of CI/CD practices.
• Strong communication skills.

• English - Upper-Intermediate or higher.

   

Nice to have

• Experience with Grafana.
• Experience with Prometheus.
• Experience with Kubernetes.
• Experience with Azure Cloud.
• Experience with large enterprise systems.
• German language.

Tech Stack

• OpenTelemetry
• .NET
• Angular
• Azure Application Insights
• Datadog
• Grafana
• Azure
• CI/CD
• Distributed Tracing
• Observability
• Monitoring
• Logging
• Metrics

Project

• International enterprise customer
• Large-scale distributed environment
• Modern cloud infrastructure
• Long-term project
• High engineering standards
• Modern DevOps culture

English

Upper-Intermediate (B2) or higher is required.

German would be considered a strong advantage.