Senior Software Engineer (Java)

LaStellar Group; New York (NY); Hybrid; USD 180,000 - 200,000; Full time

Benefits offered by this job

Equity

Year-end bonus

Company-paid healthcare

Job summary

LaStellar Group is seeking a Senior/Staff Java Engineer for an electronic trading platform in NYC. You’ll work on high-throughput, low-latency systems handling real-time market data and trades, within a team replacing legacy processes with AI-driven trading infrastructure.

Requirements include 8+ years of production Java experience, deep concurrency knowledge, strong CS fundamentals, SQL proficiency, and cloud backend experience.

Qualifications

• 8+ years building production Java systems.
• Deep multithreading and concurrency knowledge.
• Strong CS fundamentals in data structures, algorithms, and distributed systems.
• SQL proficiency with query optimization.
• Experience building and scaling cloud-based backend systems.
• Bachelor's in CS, engineering, or related field.

Responsibilities

• Core trading engine components — order management, matching logic, real-time pricing
• High-throughput, low-latency services processing live market data
• Multithreaded, concurrent systems where correctness and performance both matter
• Backend architecture as the platform transitions fully in-house
• Data pipelines and APIs that product and quant teams build on top of

Skills

Java

Multithreading

Distributed systems

Data structures

Algorithms

SQL

Cloud

Education

Bachelor's in CS

Job description

Senior/Staff Java Engineer — Electronic Trading Platform

A well-funded fintech is building the infrastructure that loans and CLO markets have never had. Trillions of dollars in these markets still move through phones, emails, and PDFs. This team is replacing that with real-time, AI-driven trading infrastructure — and they need serious backend engineers to build it.

The role

You'll be deep in the core of a proprietary electronic trading platform: high-throughput, low-latency systems handling real-time market data and trade execution. This isn't CRUD work — it's distributed systems, concurrency, and performance engineering applied to a market that's never had modern infrastructure. NYC-based (Manhattan), 4 days in-office, Friday remote.

What you actually build

• Core trading engine components — order management, matching logic, real-time pricing


• High-throughput, low-latency services processing live market data


• Multithreaded, concurrent systems where correctness and performance both matter


• Backend architecture as the platform transitions fully in-house


• Data pipelines and APIs that product and quant teams build on top of

What we need

• 8+ years building production Java systems — this is a Java shop, not a \"Java is fine\" shop


• Deep multithreading and concurrency chops — real experience with concurrent data structures, lock-free patterns, thread pool design, not just textbook knowledge


• Strong CS fundamentals — data structures, algorithms, distributed systems


• Relational databases and SQL at a level where you're optimizing queries, not just writing them


• Experience building and scaling cloud-based backend systems


• Bonus: experience in trading systems, market data infrastructure, or other latency-sensitive domains (fintech, ad-tech, gaming backend, HFT)


• Bachelor's in CS, engineering, or related field

Comp

$180,000–$200,000 base, plus equity and year-end bonus. Full medical/financial benefits, 90% company-paid healthcare, flexible PTO, daily breakfast/coffee/snacks, onsite gym.

Equal opportunity employer — does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status.