Senior/Lead Golang Engineer (Taxes)

DOU Polska; Warszawa; On-site; PLN 180,000 - 320,000; Full time

Benefits offered by this job

30+ days off

Unlimited sick leave

Office meals

Health coverage

Apple gear

Courses & conferences

Wellness benefits

Job summary

Solidgate is seeking a Senior Backend Engineer to own the Taxes module within our Billing system. You will architect and implement tax calculation and reporting across multiple locations, ensuring scalability beyond MVP and driving reliability.

You will mentor a small team and define technical direction for the Tax product. The role offers leadership opportunities, cross-functional collaboration, and a fast-growing fintech stack with modern CI/CD practices.

Qualifications

• 6+ years of backend engineering experience (Go/PHP/Kotlin/Java)
• Strong understanding of high-load system design
• Solid experience with PostgreSQL
• Experience with queues or streams
• Strong testing culture: unit, integration, functional, e2e
• Proactive, independent, result-oriented mindset

Responsibilities

• building tax calculation and reporting logic
• integrating third-party tax providers
• improving system resilience and uptime
• making architectural decisions and setting technical direction
• mentoring engineers as the team grows
• deliver key tax functionality in initial months

Skills

Go

PHP

Kotlin

Java

High-load systems

PostgreSQL

Queues/Streams

Testing culture

Independent mindset

Tools

Kafka

AWS

CI/CD

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.

Overview

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 theBilling 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.

You will have a clear path to Lead: full ownership of the Taxes direction, architectural decisions, and growing a 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

Your focus will be on:

• building tax calculation and reporting logic
• integrating third-party tax providers
• improving system resilience and uptime
• making architectural decisions and setting technical direction
• mentoring engineers as the team grows

In the first months, you’ll deliver key tax functionality and lay a solid foundation for future product and team growth.

We rely on automated testing over manual QA — unit, integration, functional, and e2e tests are a core part of how we ship and scale safely.

You’re a Great Fit If You Have

• 6+ years of backend engineering experience (Go/PHP/Kotlin/Java)
• Strong understanding of high-load system design
• Solid experience with PostgreSQL
• Experience with queues or streams
• Strong testing culture: unit, integration, functional, e2e
• Proactive, independent, result-oriented mindset

Nice to have

• Kafka
• AWS services
• CI/CD pipelines
• Fintech / payments / financial domain experience
• Understanding of VAT, GST, Sales Tax
• Experience managing 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 &Mastercardpartner 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.