Senior Principal Java Developer

Madiff • Information Technology • Property Development • Java • SQL • 3 days ago

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Salary

≈ $67k – $106k per year (Estimated)

Location

Hybrid (Warsaw, Poland)

Seniority

Principal · 5+ years exp

Employment

Full-Time

Confirmed on the employer's own hiring board on Oct 12, 2026. First seen by Alion on Oct 9, 2026.

Overview

Company

Impact

Profile match

Madiff

Madiff is an IT consulting and staff augmentation company that provides remote agile teams, nearshore development teams and individual IT contractors to enterprise clients, with most of its hiring run from Warsaw. It works across retail, banking and insurance, telecom and media, automotive, energy, transportation and life sciences, recruits consultants in Poland and Portugal and sells its services into the UK, Ireland, France, Switzerland, Northern Europe and the US. Its openings cover .NET and full stack developers, data engineers and data scientists, AI architects, system and business analysts, QA testers, project managers and IT sales staff.

madiff.eu • HQ: Warsaw, Poland • IT Outsourcing & Dedicated Teams • IT Staffing & Staff Augmentation • IT Consulting & Digital Transformation • 51-200 employees

We are looking for a Senior Principal Java Backend Developer to join a mission-critical backend platform operating at enterprise scale. The role is focused on hands-on backend development within a high-volume, production-critical fintech environment, with additional responsibility for mentoring engineers and supporting technical alignment across the team. The work involves building and maintaining core services supporting transaction processing, financial reporting, and merchant-facing functionality under strict security, availability, and performance requirements.

Responsibilities

Design, develop, and maintain backend services using Java 17+
Build scalable microservices supporting high transaction volumes
and real-time processing
Integrate backend services with Oracle databases, internal
financial systems, and external APIs
Ensure security, performance, and reliability aligned with fintech
standards
Collaborate closely with product managers, architects, and analysts
Contribute to architectural decisions and platform modernisation
Support production deployments, monitoring, and troubleshooting
Mentor junior engineers and raise engineering standards
Participate actively
in code reviews and quality initiatives

Requirements

Minimum 5 years of commercial Java backend experience
Strong expertise with Java 17+
Hands-on experience with Oracle, SQL, and PL/SQL
Solid experience with microservices and REST APIs
Strong understanding of clean architecture and design patterns
Experience working in Agile delivery teams
High ownership mindset
and strong communication skills
Previous technical
leadership or Team Lead experience (min 1 year) Nice to have
Experience in fintech, payments, or banking
environments
Exposure to CI/CD, DevOps, and containerised
environments

Benefits

Solid, competitive salary
Work in multinational environment on international projects
Comprehensive healthcare
Long-term B2B contract with stable project pipeline
Hybrid work model

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