We are seeking a highly experienced Senior Back-End Developer to join a new project – a new Document Management System (DMS) to replace the existing solution. The new system will support the full life cycle of document handling, including creation, update, review, and submission, while ensuring secure, tenant-aware access and compliance with business workflows. A critical part of the project involves migrating historical data from the current application to the new platform. You will work closely with the Engineering Owner and Product Manager, and integrate with a tight, high-performing team to design authorization flows, scalable APIs, database schemas, and infrastructure that meet both technical and business requirements.
As a Senior Back-End Developer, you will own the development of production-grade TypeScript APIs, authentication, tenant resolution, and RBAC enforcement. You will design and optimize PostgreSQL schemas for tenant-keyed tables, implement audit/event logging, and ensure strict tenant scoping. This role requires expertise in Kubernetes, Terraform, CI/CD pipelines, and secure file handling.
Responsibilities:
- Develop and maintain the application APIs
- Implement authentication, tenant resolution, and RBAC enforcement
- Enforce strict tenant scoping via request context
- Build secure S3 pre-signed upload endpoints with tenant-isolated object keys
- Design PostgreSQL schemas, migrations, and indexing for tenant-keyed tables
- Implement audit/event logging mechanisms
- Configure and manage Kubernetes deployments, Terraform infrastructure, and GitHub Actions CI/CD pipelines
Requirements:
- 5+ years of proven experience delivering production-grade back-end services and APIs
- Strong understanding of authentication flows, tenant resolution, and strict tenant scoping
- Experience with RBAC implementation and enforcement at the API/data layer
- Proficiency in secure file handling and S3 pre-signed URL workflows with tenant-isolated object keys
- Experience delivering complex back-end tasks and contributing to system design and architecture, with a strong understanding of scalability, performance optimization, and database efficiency
- Solid experience with PostgreSQL schema design, migrations, and indexing for multi-tenant environments
- Strong problem-solving skills and ability to work independently
- Excellent communication and stakeholder management skills
Will be a plus:
- Skills in implementing background jobs with Kafka
- Ability to review front-end (React) PRs
We offer:
- Remote-first work model with flexible working hours (we provide all equipment)
- Comfortable and fully equipped offices in Lviv and Rzeszów
- Competitive compensation with regular performance reviews
- 18 paid vacation days per year + all state holidays
- 12 days of paid sick leave per year without a medical certificate + extra paid leave for blood donation
- Medical insurance with an affordable family coverage option
- Mental health program which includes free and confidential consultations with a psychologist
- English, German, and Polish language courses
- Corporate subscription to learning platforms, regular meetups and webinars
- Friendly team that values accountability, innovation, teamwork, and customer satisfaction
- Inclusive environment where everyone feels valued and treated equally. We proudly partner with VeteranHub to support Ukrainian veterans
- We are committed to supporting Ukraine and actively participate in charity initiatives