Backend Engineer (Billing)

Openkrill; United States; Remote; USD 110,000 - 180,000; Full time

Benefits offered by this job

30+ days off

Unlimited sick leave

Free office meals

Health coverage

Apple gear

Job summary

Solidgate is expanding its Billing team to build Billing 2.0, spanning invoicing, retries, subscriptions, and monetization. Join a small core team tasked with a global overhaul of the subscription infrastructure, and help ship a product that scales for modern internet businesses.

The role emphasizes automated testing, Go engineering, and the opportunity to switch from Java/PHP/Python to Go or vice versa, with extensive growth potential.

Qualifications

• 2+ years backend engineering experience in Go/PHP/Kotlin/Java/Python/Node.js.
• Experience covering code with unit, integration, functional, and e2e tests.
• Strong understanding of high-load system design principles.
• Experience with PostgreSQL and queues or streams.

Responsibilities

• Design and ship the foundational Products & Prices domain model and public APIs from scratch.
• Build high-precision volume and graduated pricing engines for multi-tier enterprise billing.
• Decouple critical services from the Products API to improve uptime and reduce single points of failure.
• Lead automated retry engine across all invoices to maximize revenue recovery.

Skills

Backend engineering

Go & multi-language exposure

Testing discipline

High-load systems

PostgreSQL & queues/streams

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.

We're building the #1 payment orchestrator in the world - and the names behind us prove it. Clients include Bolt, Ajax, Nova Post, MEGOGO. Trusted by giants like J.P. Morgan. Ranked #2 in the "Employer of the Year 2026" award by Forbes Ukraine.

ABOUT THE TEAM AND ROLE

You'll join the Billing team and become part of the effort behind one of the product's core modules - the one responsible for the invoicing cycle, payment retries, subscription management, and monetization. The team is actively building Billing v2 - a global overhaul and expansion of the subscription infrastructure - and has recently grown into a full-fledged Billing Stream.

There's no legacy here - the team is building and launching the new Billing 2.0 module practically from scratch.

Your team - 1 PM, 2 Senior Engineers, 1 Automation QA, 1 Domain Analyst.

WHAT YOU'LL OWN

• Core Domain & Public APIs. Design and ship the foundational Products & Prices domain model and public APIs from scratch.
• Complex B2B Pricing at Scale. Build high-precision volume and graduated pricing engines for multi-tier enterprise billing.
• Bulletproof Platform Uptime. Decouple critical services from the Products API to eliminate single points of failure.
• End-to-End Revenue Recovery. Lead the automated retry engine across all invoices, recovering millions in failed payments.

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.

We code in Go, and we're looking equally for experienced Go engineers and strong switchers from Java, Kotlin, Python, or PHP.

YOU'RE A GREAT FIT IF YOU HAVE

• 2+ years of backend engineering experience (Go/PHP/Kotlin/Java/Python/Node.js)
• Experience covering code with tests: unit, integration, functional, e2e
• Strong understanding of high-load system design principles
• Experience with PostgreSQL and queues or streams
• A proactive, communicative, independent, and result-oriented mindset

NICE TO HAVE

• Experience with payment systems or in fintech / financial services
• Kafka
• AWS services
• CI/CD pipelines

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. Recommend someone https://jobs.ashbyhq.com/solidgate/form/external-referral-program for our role, and if they get hired, there's a bonus waiting for you - simple as that.