Software Engineer, Backend Systems
Quick facts
- Pay
- $185,000 - $300,000 base + competitive equity
- Type
- Full-time
- Location
- San Francisco, California
- Experience
- 2–4 years
- Skills
- Rust, Docker
- Industry
- Information Technology — 671 open jobs
- Visa in listing
- H-1B
- Apply
- Free to apply — never pay anyone for a job offer or visa sponsorship
Job description
Software Engineer, Backend Systems
Company: Fullstack
Location: San Francisco, CA - on-site, 5 days per week
Compensation: $185,000 - $300,000 base (based on qualifications and experience) + competitive equity
Employment Type: Full-time
About Fullstack
Fullstack is building a single front end for crypto trading. Today, retail traders are spread across multiple trading front ends, browser-extension wallets, bridges and a growing list of new venues every year, which makes trading confusing and risky for new users. Fullstack brings every product a trader wants, including perpetuals, cross-chain spot and prediction markets, into one portfolio-margin trading experience with a single unified balance.
Under the hood, users post collateral on Fullstack's systems and Fullstack extends USDC collateral to the venues of their choice, bringing the venues to the user instead of the other way around. Users will be able to post multiple forms of collateral and trade on venues such as Hyperliquid without selling down their holdings.
The founding team comes from the center of crypto trading infrastructure. One co-founder built Insilico Terminal, which the company describes as the leading order execution and management system for centralized exchanges, with more than $900B in retail trading volume. The other ran one of the top on-chain and centralized-exchange high-frequency trading firms and brings deep experience engineering low-latency systems. Fullstack has raised $15M+ and has a team of about 10, with offices in San Francisco and New York.
The Role
Fullstack is looking for a backend engineer with production Rust experience to help build the infrastructure behind its real-time trading platform. You will work on the systems that carry the most weight in the product: risk, settlement, market data and the APIs traders depend on. This role suits someone with a strong command of asynchronous programming, solid systems knowledge and a performance-driven mindset who thrives in a high-bandwidth, collaborative, in-person environment.
What You Will Do
- Build and maintain risk and liquidation engines that manage risk and improve capital efficiency in volatile markets.
- Design and implement the blockchain state machines that power trading, settlement and risk operations.
- Develop services that keep state consistent across asynchronous processes using voting, consensus and coordination mechanisms.
- Process live market data and coordinate actions across trading venues, managing WebSocket streams and time-sensitive workflows.
- Build high-performance REST and WebSocket APIs that power the trading interface with millisecond-level response times.
What You Bring
- 2-4 years of experience as a backend software engineer
- In-depth, production experience with Rust
- Strong command of asynchronous programming (Tokio experience is a plus) and distributed systems
- A performance-driven mindset and comfort with latency-sensitive, real-time systems
- Ability to work on-site in San Francisco 5 days per week
- Work authorization: Fullstack can support TN visas and H-1B transfers only (excluding H-1B holders in year 3 or year 6). Candidates who do not need sponsorship are also welcome.
Tech Stack
Rust, Tokio, distributed systems, blockchain, REST APIs, WebSocket APIs, Docker
Visa sponsorship record
No public sponsorship records foundWe didn't find H-1B, H-1B1, E-3 or green card (PERM) filings under the name See more jobs at Transparent Search Groupexternal in the Department of Labor and USCIS data. That doesn't mean the job can't be sponsored — the company may file under a different legal name, be new to sponsorship, or sponsor a visa that isn't in these datasets (for example H-2B or J-1).
Tip: ask the recruiter early, in writing, which visa they sponsor and whether they cover the legal and filing fees.
Which visas can work for this job
Occupation: Computer Systems Engineers/Architects (SOC 15-1299).
- Mentioned in the listing
H-1B
- H-1B cap-exempt employer
Regular cap-subject employer — a new H-1B needs to win the lottery in March (unless you already hold cap-counted H-1B status).
- TN (citizens of Canada and Mexico)
This kind of role may fit the USMCA profession “Computer Systems Analyst (or Engineer, for engineering-degree holders)” — it depends on the actual duties. No lottery, no cap; you need the matching degree or license.
- E-3 (Australia) and H-1B1 (Chile, Singapore)
Same degree requirement as H-1B, but no lottery and a separate quota that is rarely filled.
- O-1 (extraordinary ability)
For candidates with awards, publications, press, a high salary or critical roles at distinguished organizations. No cap, no lottery; the employer files a petition.
- STEM OPT extension (F-1 students)
Requires an E-Verify employer. We didn't find this company in the E-Verify list — ask HR.
Salary vs prevailing wage
Level III (experienced)Computer Systems Engineers/Architects · San Francisco-Oakland-Fremont, CA. Annual prevailing wages set by the Department of Labor (OFLC).
| Level | Prevailing wage | H-1B lottery odds* |
|---|---|---|
| Level I | $80,870 | ~15% |
| Level II | $121,014 | ~31% |
| Level III | $161,138 | ~46% |
| Level IV | $201,282 | ~61% |
This job pays $185,000–$300,000 a year — that's Level III (experienced). In the wage-weighted H-1B lottery a Level III registration gets 3 entries; estimated selection chance about 46% — better than average.
* Odds are DHS projections for the FY2027 wage-weighted lottery (actual results vary by year and employer). Since the FY2027 cap season the H-1B lottery is weighted by wage level: Level I = 1 entry, II = 2, III = 3, IV = 4. The level is set by the offered wage against the prevailing wage for the occupation and worksite. Separately, a $100,000 fee for new H-1B petitions for workers outside the US was announced in 2025; as of September 2026 a federal court ruling keeps it unenforceable while appeals continue — check the current status.
Sources: U.S. Department of Labor OFLC disclosure data (H-1B/H-1B1/E-3 LCA, PERM), OFLC prevailing wage data, USCIS H-1B Employer Data Hub, E-Verify participating employers. Data loaded: LCA FY2024–FY2026, PERM, USCIS Data Hub, OFLC wages; updated 2026-10-03. Employers are matched by name, so records of companies with similar names can occasionally be mixed up. This is general information, not legal advice — talk to an immigration attorney about your case.