Senior Full-Stack Engineer (Nest.js, React)

Djinni; Polska; On-site; PLN 240,000 - 320,000; Full time

Job summary

A regulated financial institution is seeking a Senior Backend Developer to work on maintaining scalable services using NestJS and TypeScript. Candidates should possess over 7 years of experience and be adept with tools like PostgreSQL and Docker. The role includes responsibilities such as collaborating on UI integration with React and driving architectural improvements. This position offers full remote work flexibility and the opportunity to engage in a dynamic technical environment, requiring Upper-Intermediate English proficiency.

Qualifications

• 7+ years of experience in Backend or Full-Stack development with a strong backend focus.
• Upper-Intermediate English (B2) proficiency.
• Strong communication and teamwork skills.

Responsibilities

• Develop and maintain scalable backend services using NestJS and TypeScript.
• Support frontend development with React and collaborate on UI integration.
• Implement advanced NestJS constructs such as Guards, Interceptors, Pipes, Providers, and Custom Decorators.
• Improve backend performance through profiling, caching, and bottleneck analysis.

Skills

NestJS

TypeScript

PostgreSQL

ReactJS

Git (Gitflow)

Tools

Docker

CI/CD tools

AWS

Job description

**Customer Description**The client is a regulated financial institution providing secure, compliant, bank-grade services for digital financial assets to institutional and private clients.The organization operates an integrated platform that covers custody, trading, asset management, lending, and digital instrument services while strictly adhering to regulatory and security standards.**Project phase:** Ongoing**Responsibilities*** Develop and maintain scalable backend services using NestJS and TypeScript, including REST APIs and database/ORM interactions.* Support frontend development with React and collaborate on UI integration.* Implement advanced NestJS constructs such as Guards, Interceptors, Pipes, Providers, and Custom Decorators.* Improve backend performance through profiling, caching, and bottleneck analysis.* Work with microservices, asynchronous workflows, message queues, and third-party integrations.* Contribute to architecture improvements and internal AI initiatives.**Required Technical Skills****Core technologies:** NestJS, TypeScript, PostgreSQL, ReactJS, Git (Gitflow) **Additional tools and platforms:** NX, Docker, CI/CD tools, AWS**Experience:** 7+ years in Backend or Full-Stack development with a strong backend focus**Soft Skills*** Self-motivated, results-driven, and able to work independently* Proactive mindset with ability to drive improvements and align with tech strategy* Strong communication and teamwork skills, able to explain complex concepts* Analytical thinking, problem-solving abilities, and system design capabilities* Adaptable and quick to learn new technologies**Interview Process**1. English check – 15 minutes2. Internal technical interview – 1 to 1.5 hours3. Client interview – 1 hour**Employment type:** Full-time **Experience level:** Senior **Language proficiency:** Upper-Intermediate English **Location:** Poland (EU time zone) **Start date:** ASAP **Team size:** 20+* **Only from 7 years of experience*** **Full Remote*** **Poland** Countries where we consider candidates* + **English B2 - Upper Intermediate**