Senior Backend Engineer - Golang/Java

Magnite; Belfast; Hybrid; GBP 55,000 - 75,000; Full time

Job summary

A leading advertising technology firm in Belfast is seeking a Senior Backend Engineer to develop high-performance systems that manage billions of events daily. This role offers the opportunity to work in a collaborative environment using Go, Java, and cloud technologies. The ideal candidate should have strong software engineering skills, familiarity with relational databases, and an eagerness to learn and mentor. This position provides a hybrid work schedule and comprehensive benefits.

Benefits

Holiday Breaks and Quarterly Wellness Days

Equity and Employee Stock Purchase Plan

Family-Focused Benefits and Parental Leave

Private Medical Insurance

Competitive Pension Plan

Disability and Life Insurance

Mobile Phone Subsidy

Fitness and Wellness Reimbursement

Qualifications

• 4+ years of professional software engineering experience.
• Experience in Go preferred, but another modern language is acceptable.
• Hands-on experience with relational databases (Postgres, MongoDB).
• Strong communication skills in both written and verbal forms.
• Experience collaborating across teams effectively.

Responsibilities

• Build and scale real-time data systems that process 2 billion daily events.
• Design APIs and microservices for audience insights.
• Collaborate to turn ideas into production systems.
• Own services from design to deployment.
• Improve performance and reliability across distributed systems.

Skills

Experience in Go

Professional software engineering

Strong communication skills

Hands-on experience with relational databases

Experience collaborating across teams

Education

N/A

Tools

Postgres

MongoDB

Kafka

AWS

Docker

Golang

Job description

Senior Backend Engineer - Golang / Java

Belfast, Northern Ireland

Hybrid Schedule (M/F remote, T/W/TH in-office)

If you enjoy working in a collaborative environment, learning new technologies, mentoring others, and developing software that shapes the future of audience targeting, we'd love to meet you.

In this Backend Engineer role, you'll help design, build and optimise systems that process billions of events every day, powering Magnite's Audience Platform.

At Magnite, we cultivate an environment of continuous growth and collaboration. Our work impacts what millions of people read, watch, and buy, and we're looking for people to help us tackle that responsibility with creativity and focus. Magnite (NASDAQ: MGNI) is the world's largest independent sell-side advertising platform. Publishers use our technology to monetize their content across all screens and formats including CTV / streaming, online video, display, and audio. Our tech fuels billions of transactions per day!

About Magnite's Audience Platform

Magnite's Audience Platform helps publishers like Roku and Disney make their advertising space more valuable to advertisers and adverts more relevant to viewers. It gathers real-time signals and contextual data to classify content and audiences, enabling advertisers to reach "cat lovers," "sports fans," and thousands of other segments with precision. All of this happens in milliseconds, billions of times a day, across the internet. Pretty nifty.

We are looking for a senior backend engineer who loves tackling high volume, distributed systems and tuning ultra-low-latency services. If you thrive in a collaborative, high-ownership environment and want to shape the future of audience targeting at scale, we'd love to meet you.

About the team

We're a small, experienced team that values clean design, strong fundamentals, and ownership of what we build. You'll work alongside engineers who love to experiment with new tools and deliver systems that run reliably at massive scale.

• Stream, ingest and asynchronously process 2 Billion+ events every day
• Run sub-20 ms, high-QPS microservices
• Operationalize Data Science models - from simple feature extraction to complex LLMs
• Solve problems with the most appropriate tools and technologies

What You'll Do

• Build and scale real-time data systems that process 2 Billion daily events
• Design APIs and microservices that power audience insights in milliseconds
• Collaborate with Ops, Data Science, and Product to turn ideas into production systems
• Own services end-to-end - from design and development to deployment and observability
• Improve performance, reliability, and throughput across distributed systems

What We're Looking For (Minimum Qualifications)

• 4+ years of professional software engineering experience (we care more what you can do than exact years)
• Experience in Go is preferred, but proficiency in another modern, object-oriented language is great too - and you'll get the chance to learn Go here
• Hands‑on experience with relational databases (e.g. Postgres) and document databases (e.g. MongoDB)
• Strong communication skills, both written and verbal
• Experience collaborating effectively across teams

Bonus Points (Nice‑to‑Have Experience)

• Hands‑on experience with Golang in production
• Experience with data streaming tools (e.g. Kafka)
• If you love solving challenging distributed systems problems, and want your work to power products used across the internet, we'd love to talk.
• Experience adding observability features to solutions you've built
• Exposure to high-throughput or low-latency systems
• Familiarity with AWS or other cloud platforms
• Familiarity with SQL and NoSQL data stores
• Implementing caching systems as part of a solution
• Mentoring teammates is a plus

Our Current tech stack

• Golang, Java
• ECS, Fargate, Docker, ALB, HAProxy
• RDS, MariaDB, DocumentDB, Postgres, ScyllaDB
• Redis, Memcache
• Kafka, SNS, SQS
• Terraform, Github Actions, Jenkins

Comprehensive Perks and Benefits

• Holiday Breaks and Quarterly Wellness Days
• Equity and Employee Stock Purchase Plan
• Family-Focused Benefits and Parental Leave
• Private Medical Insurance
• Competitive Pension Plan
• Disability and Life Insurance
• Mobile Phone Subsidy
• Fitness and Wellness Reimbursement

Company Culture

We believe collaboration is essential to success. Magnite's hybrid schedule includes two days worked remotely (Monday and Friday) and three days on-site (Tuesday, Wednesday and Thursday). Our offices provide lunches, beverages, snacks, training and development, and office events to support your work week. We also understand you have appointments, families, hobbies, and other commitments. Magnite strives to maintain a healthy work/life integration for all employees so you can bring your best every day - both at work and at home.

Magnite Invests in You

• Career Development Initiatives and a Career Growth Framework
• Culture and Inclusion Programs
• Bonusly Peer-to-Peer Recognition Program
• Community Service and Volunteer Events
• Company-Matched Charitable Contributions
• Mental Health Support

About Us

The world's leading agencies and brands trust our platform to access brand-safe, high-quality ad inventory and execute billions of advertising transactions each month. Anchored in bustling New York City, sunny Los Angeles, mile high Denver, historic London, and down under in Sydney, Magnite has offices across North America, EMEA, LATAM, and APAC.

Our Commitment: We aim to incorporate a wide range of voices into our Magnite culture, cultivating an environment where employees feel welcomed, cared for, and encouraged to freely share ideas. We are committed to employee growth, collaboration, inclusion, and innovation. We invest in Magnite's local communities. We seek talent from all backgrounds to champion corporate values of seeing the big picture and being catalysts of change.

Want to learn more about us?

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