Software Developer - Advanced

3Core Systems, Inc; Quincy (MA); Hybrid; USD 130,000 - 170,000; Full time

Job summary

3Core Systems, Inc. in Quincy, MA seeks a senior backend/server-side engineer with strong Core Java fundamentals, multithreading, concurrency, and data structures.

You will design, develop, and support enterprise applications within a post-trade domain, leveraging Java 17 where possible and Kafka-driven integrations. You should have 7+ years in Java (8+), Spring Boot 3, and experience with Kafka or similar streaming platforms, relational databases, and Kubernetes in distributed environments.

Qualifications

• 7+ years of Java experience (Java 8 or higher).
• Strong expertise in Spring Boot 3.
• 3+ years of Kafka or alternative event-streaming platforms.
• 5+ years of relational databases (Oracle, SQL Server, MySQL, PostgreSQL).
• Experience with distributed caching and in-memory data grids (Hazelcast).
• Proficiency with Git/Bitbucket, Jira, and Maven.
• Experience deploying and managing scalable applications on Kubernetes.
• Knowledge of capital markets and back-office technology platforms.

Responsibilities

• Hands-on experience in system design, application development, testing, and operational support of enterprise applications.
• 7+ years of experience in Java (Java 8 or higher) with strong expertise in Spring Boot 3.
• 3+ years of experience with Kafka or other event-streaming platforms such as RabbitMQ, Client Kinesis, or Azure ServiceBus.
• 5+ years of experience working with relational databases such as Oracle, SQL Server, MySQL, or PostgreSQL.
• Experience with distributed caching and in-memory data grid technologies, such as Hazelcast.
• Proficiency with software development and DevOps toolsets including Git/BitBucket, Jira, and Maven.
• Experience designing, deploying, and managing scalable applications on Kubernetes.
• Knowledge of capital markets, with a strong understanding of back-office technology platforms and systems.

Skills

Core Java

Multithreading

Concurrency

Data structures

System design

Tools

Java 8/11/17

Spring Boot 3

Kafka

RabbitMQ

Client Kinesis

Azure ServiceBus

Oracle

SQL Server

MySQL

PostgreSQL

Hazelcast

Git

Bitbucket

Jira

Maven

Kubernetes

Job description

Quincy, United States | Posted on 07/31/2026

Location: Quincy,MA (Hybrid - onsite for 4 days a week)

Duration: 12months contract

InterviewProcess: 2 rounds, 1 st round will 45-60 mins virtual followed byfinal round in-person interview for an hour.

Client is lookingfor a senior backend/server-side engineer who is extremely strong in Core Javafundamentals, particularly multithreading, concurrency, algorithms, and datastructures.

Looking forsomeone who is strong in Core Java concepts like multithreading, Datastructure, Algorithms, concurrency, team is using Java 17 but manager is openfor someone with strong Java 8 as well, this is for their post-tradeapplication team so if you find someone with Trading application or Capitalmarket background will be huge.

Kafka

Very important

"Mostofour integrations are Kafka-driven."

Kafka is effectively their primaryevent streaming platform.

Candidatesshould have hands-on experience with:

• Event-driven architecture

Responsibilities

• Hands-on experience in system design,application development, testing, and operational support of enterpriseapplications.
• 7+ years of experience in Java (Java 8 orhigher) with strong expertise in Spring Boot 3.
• 3+ years of experience with Kafka or otherevent-streaming platforms such as RabbitMQ, Client Kinesis, or Azure ServiceBus.
• 5+ years of experience working withrelational databases such as Oracle, SQL Server, MySQL, or PostgreSQL.
• Experience with distributed caching andin-memory data grid technologies, such as Hazelcast.
• Proficiency with software development andDevOps toolsets including Git/BitBucket, Jira, and Maven.
• Experience designing, deploying, and managingscalable applications on Kubernetes.
• Knowledge of capital markets, with a strongunderstanding of back-office technology platforms and systems.