Freelance Software Developer (C/C++ - Rust) - AI Trainer

Trexquant is a growing systematic fund at the forefront of quantitative finance, with a core team of highly accomplished researchers and engineers. To keep pace with our expanding global trading operations, we are seeking a C++ Market Data Engineer to design and build ultra-low-latency feed handlers for premier vendor feeds and major exchange multicast feeds. This is a high-impact role that sits at the heart of Trexquant's trading platform; the quality, speed, and reliability of your code directly influence every strategy we run. Responsibilities Design & implement high-performance feed handlers in modern C++ for equities, futures, and options across global venues (e.g., NYSE, CME, Refinitiv RTS, Bloomberg B-PIPE). Optimize for micro- and nanosecond latency using lock-free data structures, cache-friendly memory layouts, and kernel-bypass networking where appropriate. Build reusable libraries for message decoding, normalization, and publication to internal buses shared by research, simulation, and live trading systems. Collaborate with cross-functional teams to tune TCP/UDP multicast stacks, kernel parameters, and NIC settings for deterministic performance. Provide robust failover, gap-recovery, and replay mechanisms to guarantee data integrity under packet loss or venue outages. Instrument code paths with precision timestamping and performance metrics; drive continuous latency regression testing and capacity planning. Partner closely with quantitative researchers to understand downstream data requirements and to fine-tune delivery formats for both simulation and live trading. Produce clear architecture documents, operational run-books, and post-mortems; participate in a 24×7 follow-the-sun support rotation for mission-critical market-data services. Requirements BS/MS/PhD in Computer Science, Electrical Engineering, or related field. 3+ years of professional C++ (14,17,20) development experience focused on low-latency, high-throughput systems. Proven track record building or maintaining real-time market-data feeds (e.g., Refinitiv RTS/TREP, Bloomberg B-PIPE, OPRA, CME MDP, ITCH). Strong grasp of concurrency, lock-free algorithms, memory-model semantics, and compiler optimizations. Familiarity with serialization formats (FAST, SBE, Protocol Buffers) and time-series databases or in-memory caches. Comfort with scripting in Python for prototyping, testing, and ops automation. Excellent problem-solving skills, ownership mindset, and ability to thrive in a fast-paced trading environment. Familiarity with containerization (Docker/K8s) and public-cloud networking (AWS, GCP). Benefits Competitive salary, plus bonus based on individual and company performance. Collaborative, casual, and friendly work environment while solving the hardest problems in the financial markets. PPO Health, dental and vision insurance premiums fully covered for you and your dependents. Pre-Tax Commuter Benefits  Trexquant is an Equal Opportunity Employer

Now Seeking Experienced TREE CLIMBERS to join our team! • TOP WAGES! • PAID vacation time! • PAID holidays! • PAID Company Contribution to health benefits! • Opportunities to learn, grow, lead and more! West Valley Arborists is a growing tree care company with a strong reputation and A LOT of work ahead. JOIN OUR TEAM specializing in commercial and residential services within the greater Bay Area. We are looking for candidates who have: • Experience as a Tree Climber, • The desire to provide quality tree care and customer service, • An understanding of ISA pruning and TCIA safety standards, • A reliable, strong work ethic year-round and a • Friendly, can-do attitude! Experience should include tree industry services: installation, fine pruning and shaping, rigging, cabling and bracing, and tree/stump removals of all sizes and knowledge of equipment: bucket lift, chipper, dump truck and trailers, saws, grinders, etc. Applicant must be allowed to work in the US, have a valid Driver’s License. Being BILINGUAL is a big plus! DON'T MISS THIS OPPORTUNITY, APPLY TODAY!

Atto Trading, a dynamic quantitative trading firm founded in 2010 and leading in global high-frequency strategies, is looking for a Low-Latency Developer to join our team. We are expanding an international, diverse team, with experts in trading, statistics, engineering, and technology. Our disciplined approach combined with rapid market feedback allows us to quickly turn ideas into profit. Our environment of learning and collaboration allows us to solve some of the world’s hardest problems, together. As a small firm, we remain nimble and hold ourselves to the highest standards of integrity, ingenuity, and effort.  Position Highlights: We are modernizing our trading and research platform to scale our alpha trading business. This platform will enable researchers to explore, test, and deploy sophisticated signals, models, and strategies across asset classes in a robust, fully automated manner while maintaining competitive latency targets. As a Low-Latency Developer, you will be responsible for designing, optimizing, and maintaining high-performance trading systems to minimize latency. Your Mission and Goals: Analyze and optimize the performance of low-latency trading systems by identifying bottlenecks and inefficiencies in the code, and implementing effective solutions.  Develop and adapt the platform to support the demands of a fast-paced trading environment, while effectively managing technical debt. Requirements Over 5 years of experience as a low-latency developer with a focus on performance optimization in a high-frequency trading (HFT) environment. Experience with multiple components of an HFT platform or system, particularly those on the critical path. Experience working at an HFT firm during its startup phase and/or on a trading team is a significant plus. Technical Skills: Deep knowledge of HFT platforms: networking, kernel bypass, market data, order entry, threading, inter-process communication, and strategy APIs. Proven low-latency development and performance optimization in HFT. Strong proficiency in C++. Excellent understanding of CPU caches and cache efficiency. Experience with multithreaded and multi-process synchronization. Good understanding of networking protocols. Skilled in performance profiling and optimization tools. Advanced knowledge of Linux operating systems, including kernel-level device mechanisms. About You: Practical decision-making skills. Excellent communication skills. Strong analytical and problem-solving skills. Passion for trading. Ability to work independently and as part of a team. Benefits Competitive rates of pay. Paid time off (5 weeks). Coverage of health insurance costs. Office lunches. Discretionary bonus system.  Annual base salary range of $150,000 to $300,000. Pay (base and bonus) may vary depending on job-related skills and experience. Our motivation: We are a company committed to staying at the forefront of technology. Our team is passionate about continual learning and improvement. With no external investors or customers, we are the primary users of the products we create, giving you the opportunity to make a real impact on our company's growth. Ready to advance your career? Join our innovative team and help shape the future of trading on a global scale. Apply now and let's create the future together!

We are a successful plumbing company in San Francisco, renowned for our commitment to quality and exceptional customer service. We are currently seeking several motivated Plumbing Apprentices to join our team. This is a valuable opportunity to begin your career in the plumbing industry. Candidates should possess humility and patience as they work towards their path of becoming a plumber. Apprentices will assist plumbers in various projects, including plumbing installations, water heaters, sewer work, and excavation. Please note that this position is very physical and will require some digging and heavy lifting. **Qualifications** - Experience with hand tools is required. - Valid driver’s license with a clean DMV record. - Bilingual abilities are a strong plus. - Knowledge of the San Francisco area is an advantage. If you are eager to learn and grow within a respected company, please submit your application or visit our office in person Monday through Friday between 8 and 10 AM

About BestEx Research BestEx Research is a financial technology and research firm specializing in building sophisticated execution algorithms and transaction cost modeling tools servicing multiple asset classes. The firm provides its services to performance-demanding hedge funds, CTAs, asset managers, and banks through a traditional electronic broker and in a broker-neutral Software as a Service (SaaS) model. BestEx Research’s mission is to become the leader in automation and measurement of execution across asset classes globally and significantly reduce transaction costs for our clients. Its cloud-based platform, Algo Management System (AMS), is the first end-to-end algorithmic trading solution for equities, futures, and foreign exchange that delivers an entire ecosystem around execution algorithms, including transaction cost analysis (TCA), an algo customization tool called Strategy Studio, a trading dashboard, and pre-trade analytics in a single platform. The platform is currently live for US equity and global futures trading. BestEx Research is disrupting a $100 billion industry by challenging the status quo of stale, black-box solutions from banks and offering next-generation execution algorithms that combine performance improvement with transparency and customization. BestEx Research uses leading-edge technology to support its low-latency, highly scalable research and trading systems with its back end in C++, research libraries in C++/Python and R, and web-based technologies for delivering its front-end platforms. Visit bestexresearch.com for more information about our mission, products, research, and services. Why work at BestEx Research? If you want to help investors reduce their trading costs in an incredibly complex market structure and help create and shape an industry-defining product, then this is an excellent opportunity to join an incredibly talented team of 50+. BestEx Research has almost zero turnover, top notch clients, zero bureaucracy, and a flat organizational structure. It is a true meritocracy, set in a collaborative environment, where every employee is working on extraordinarily interesting projects. Compensation may be in the form of cash compensation or a hybrid cash and equity compensation plan. Employees at BestEx Research receive a lot of autonomy and accountability and have exposure to much more variety in the projects they complete and opportunities for growth than in similar roles at other firms. Location: Stamford, CT/New York, NY Our Stamford, CT is conveniently located in Stamford downtown and walking distance from train station. Free vale parking, Gym and other amenities are available. Some flexibility to work from home is available depending on your location but at least three days a week work from office is a requirement. Primary Job Responsibilities In this role, you will be responsible for architecture, design, and software development of various software components such as our core trading system, algo trading framework, execution algorithms, smart order routers, exchange simulators, market data adaptors and exchange connectivity adaptors. Projects will vary from developing software from scratch (for example implementing a new asset class or a new execution algorithm) to enhancing the current system to support new features or improving performance. Our trading software stack is written in C++ 17. Requirements For this role following are required: ● Expert-level knowledge of C++ and excellent software design skills ● Expert-level knowledge of TCP/IP and multithreading ● Excellent problem solving and analytical skills ● Excellent communication skills and ability to articulate ideas ● An attitude of constant curiosity and growth, as well as the ability and desire to mentor others ● Degree in Computer Science or similar field from a reputable institution The following are not required, but a combination of these skills and experiences is highly desirable: ● Prior experience working with market data, FIX, and other exchange connectivity protocols ● Prior experience developing trading systems or execution algorithms ● Experience with knowledge of relational databases, database optimizations and SQL ● Experience with Python/R, ability to work with large datasets in a research environment Benefits 4 weeks of vacation, healthcare and 401K

Landscape crew leader position: Need to have at least three years at that position. Have to have a current Ca drivers license with clean record. Must have experience working with a crew and running a crew. Must have experience with building walls, laying pavers, driving tractor. Doing landscape planting correctly, setting grades, setting boulders etc. Must be knowledgeable about all phases of landscape construction. Knowing how to do landscape planting correctly and install mulch is required. We are looking for a self starter that can see the value and opportunity at hand with this company. Having experience with commercial landscape maintenance is a plus.