Lead Golang Engineer (Taxes)

Solidgate; Warszawa; On-site; PLN 240,000 - 360,000; Full time

Job summary

Solidgate is seeking a Lead Developer to own and advance the Taxes module within its billing system. You will define the architecture for tax calculation and reporting, lead integrations with tax providers, and drive reliability and scalability across services.

You'll mentor engineers, shape engineering practices, and guide a small team through rapid growth. This role emphasizes ownership, proactive problem solving, and delivering high-impact tax functionality.

Qualifications

• 4+ years of backend engineering experience.
• 1.5+ years of commercial Go development.
• Experience designing and owning high-load distributed systems.
• Strong PostgreSQL experience.
• Solid experience with queues or streams.
• Strong testing culture including unit, integration, and e2e tests.
• Experience mentoring engineers and setting technical direction.
• Proactive, independent, results-oriented mindset with ownership.

Responsibilities

• Set technical direction for tax calculation and reporting architecture.
• Lead integration with third-party tax providers and manage partnerships.
• Drive system resilience, uptime, and scalability across services.
• Lead, mentor, and grow the engineering team and influence hiring.

Skills

Backend engineering

Go development

Distributed systems

PostgreSQL

Testing culture

Mentoring engineers

Ownership mindset

Tools

Kafka

AWS services

CI/CD pipelines

Job description

Our Mission and Vision

At Solidgate, our mission is clear: to empower outstanding entrepreneurs to build exceptional internet companies. We exist to fuel the builders — the ones shaping the digital economy — with the financial infrastructure they deserve. To achieve that, we’re on a bold path: to become the #1 payments orchestration platform in the world.

We believe the future of payments is shaped by people who think big, take ownership, and bring curiosity and drive to everything they do. That’s exactly the kind of teammates we want on board.

_ Solidgate is part of _
_ Endeavor _ — a global community of the world’s most impactful entrepreneurs. We’re proud to be the first payment orchestrator from Europe to join — and to share our expertise within a network of outstanding global companies.

About the Team and Role

You’ll join the Billing team and take ownership of the Taxes module — a core part of our billing system responsible for tax calculation and reporting across multiple locations.

The product has already moved beyond MVP and is actively used by customers. The foundational logic is in place , demand is high, and the next step is scaling functionality and reliability.

This role is exciting because you’re not maintaining legacy code — you’re building and shaping a critical system almost from scratch.
As Lead, you’ll take full ownership of the Taxes direction, drive end-to-end architectural decisions, and build and grow the team around it.

Your team — Product Owner, 1 Senior Engineer, 1 Junior Engineer, Automation QA, and Tax Manager.

Explore our technology stack here .

What you’ll own

As a Lead Developer, you’ll set the technical direction for the team and take end-to-end ownership of how we build and scale our tax platform. Your focus will be on:

• defining the architecture and technical strategy for tax calculation and reporting logic
• leading the integration of third-party tax providers and owning those technical partnerships
• driving system resilience, uptime, and scalability across services
• making high-impact architectural decisions and establishing engineering standards and best practices
• leading, mentoring, and growing the engineering team, and helping shape hiring as the team scales

In your first months, you’ll deliver core tax functionality, establish a solid technical foundation, and define the engineering practices that will support future product and team growth.

We rely on automated testing over manual QA — unit, integration, functional, e2e tests are a core part of how we ship and scale safely, and you’ll champion this culture across the team.

You’re a great fit if you have

• 4+ years of backend engineering experience
• 1.5+ years of commercial Go development
• Proven experience designing and owning high-load, distributed systems
• Strong, hands-on experience with PostgreSQL
• Solid experience with queues or streams
• A strong testing culture: unit, integration, functional, e2e
• Experience mentoring engineers and setting technical direction
• A proactive, independent, result-oriented mindset with strong ownership

Nice to have

• Kafka
• AWS services
• CI/CD pipelines
• Fintech / payments / financial domain experience
• Understanding of VAT, GST, Sales Tax
• Experience managing or leading teams

Why Solidgate?

High-impact role. You’re not inheriting a perfect system — you’re building one.

Great product. We’ve built a fintech powerhouse that scales fast. Solidgate isn’t just an orchestration player — it’s the financial infrastructure for modern Internet businesses. From subscriptions to chargeback management, fraud prevention, and indirect tax — we’ve got it covered. We hold financial licenses in key regions and are a direct Visa & Mastercard partner and sub-reseller (top 5 globally).

Massive growth opportunity. Solidgate is scaling rapidly — this role will be a career-defining move.

Top-tier tech team. Work alongside our driving force — a proven, results-driven engineering team that delivers.

Modern engineering culture. TBDs, code reviews, solid testing practices, metrics, alerts, and fully automated CI/CD.

The Extras: 30+ days off, unlimited sick leave, free office meals, health coverage, and Apple gear to keep you productive. Courses, conferences, sports and wellness benefits — all designed for ideas, focus, and fun.

Tomorrow’s fintech needs your mindset. Come build it with us.

Know top talent? We’re always on the lookout. Refer someone for our role, and if they get hired, there’s a bonus waiting for you — simple as that.