Senior Java Engineer (Fintech project)

Igbaffiliate; London; Hybrid; GBP 60,000 - 100,000; Full time

Job summary

An innovative startup in the fintech sector is seeking a Senior Java Engineer to design and implement core backend services for high-performance, complex distributed systems. This role offers the opportunity to shape the future of payments technology while working in a collaborative environment that values autonomy and innovative thinking. You will take ownership of service design and APIs, conduct code reviews, and mentor mid-level engineers. With flexible hours, remote work options, and a strong focus on personal development, this position is perfect for motivated self-starters looking to make a significant impact.

Benefits

28 paid business days off

Flexible hours

Remote work options

Medical and mental health benefits

Support for courses and training

English classes and speaking clubs

Internal library and educational events

Qualifications

• Deep understanding of backend architecture and API design.
• Experience with distributed systems and concurrency handling.

Responsibilities

• Design and implement core backend services for complex distributed systems.
• Conduct code reviews and mentor mid-level engineers.

Skills

Java

Backend Architecture

API Design

Postgres

gRPC

CI/CD

Payment Systems Knowledge

Communication Skills

Job description

As Senior Java Engineer (Fintech project)

Job Description

WHAT YOU’LL DO

1. Design and implement core backend services for high-performance, complex distributed systems.
2. Utilize modern development practices such as TDD/BDD.
3. Own service design and APIs for internal and external integrations.
4. Write clear, modern, well-tested code.
5. Collaborate across teams in a product-driven environment.
6. Conduct code reviews and mentor mid-level engineers.
7. Take ownership of key technical decisions, focusing on scalability and throughput optimization.
8. Document work clearly for team use.

WHAT WE EXPECT FROM YOU

• Deep understanding of backend architecture, API design, and scaling.
• Experience with gRPC or API-first design is a plus.
• Proficiency in Java and distributed systems, including handling concurrency, retries, and consistency.
• Strong skills with Postgres, including data modeling and query optimization.
• Motivated self-starter valuing autonomy.
• Excellent communication skills and ability to challenge ideas constructively.
• Familiarity with CI/CD workflows and basic infrastructure tasks.
• Knowledge of payment systems, especially routing, retries, and subscriptions, is advantageous.

Additional Information

Interested in this position? Kate can provide more details!

How It Works

1. Intro call with Talent Acquisition.
2. Technical interview with CTO (~60 minutes).
3. Final interview with CEO and CTO.
4. Reference check.

We value your thinking and building skills over ticking every box. Even if the job title isn’t a perfect fit, you might be the right candidate.

What We Offer

• Opportunity to shape the future of payments technology.
• Innovative, collaborative startup culture.
• 28 paid business days off.
• Flexible hours and remote work options.
• Medical and mental health benefits.
• Support for courses and training.
• English classes and speaking clubs.
• Internal library and educational events.