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COMPANY OVERVIEW Lydian is developing the lowest cost sustainable fuels from waste CO2, water, and renewable electricity to decarbonize the aviation industry. Our breakthrough technology replaces oil and gas refining with fully electrified, modular, and flexible reactor systems that produce fuel with 95% lower emissions than traditional jet fuel. Since our founding in 2021, Lydian has achieved key milestones in record time, including the production of our first liquid fuel from our pilot system, capable of producing ~10,000 gallons of fuel per year for a fraction of the capital and time of alternative approaches. Lydian is backed by top climate investors including Congruent Ventures, Galvanize Climate Solutions, Union Square Ventures, Voyager Ventures, Grok Ventures, and Overture. We are building a motivated, diverse, and collaborative team that is passionate about addressing the growing climate crisis and is committed to excellence in their work. In particular, we look for tenacious people who are energized by solving the hardest, highest impact problems that come their way. POSITION OVERVIEW Lydian is looking for a Senior Reactor Modeling Engineer to conduct multi-physics modeling/simulation and data analysis. You will develop thermofluid models of Lydian’s reactors and apply to them to various design, optimization, and experimental troubleshooting challenges. You will collaborate with experimentalists to gather data to validate your models, and will work with teams across the company as a lead for data handling and advanced data analysis. We are looking for someone with strong fundamentals in heat transfer, fluid mechanics, thermodynamics, and chemical reaction kinetics who can confidently synthesize multi-physics models. Our ideal candidate can reliably assess a physical system and then craft CFD and/or analytical models that accurately capture its behavior. You need to have a strong background in data analysis and experience providing data and model-driven insights to designers and experimentalists. RESPONSIBILITIES - Develop thermofluid/reaction models of Lydian’s custom-designed reactors - Perform detailed analyses (hand calculations, FEA, CFD, etc.) to support design and optimization of critical reactor components - Leverage models to sharpen our understanding of experimental systems, aiding with troubleshooting, design of experiments, and selection of process parameters - Collaborate with teammates to design, build, and execute tests to obtain experimental data for model validation and parameter extraction - Develop data analysis methods to support teams across Lydian - Collaborate with process engineers to implement parametrized reactor models in plant-level simulations QUALIFICATIONS - BS, MS, or Ph.D. in Mechanical Engineering, Chemical Engineering, or similar. MS or Ph.D. are preferred - 5+ years of experience in analysis of thermal fluid, reactor, or catalytic systems - Experience using CFD software (Ansys, COMSOL, OpenFOAM, STAR-CCM+, etc.) to analyze physical systems and guide product design - Skilled at analyzing experimental data, drawing meaningful conclusions, and presenting findings to a broader team - Strong ability to apply engineering principles—including thermodynamics, fluid mechanics, and heat and mass transport—to systematically approach complex design problems - Experience modeling reactors and chemical kinetics - Comfortable working independently to define and execute projects COMPANY CULTURE AND BENEFITS - Challenging, collaborative, and meaningful work and an important voice in company development - Competitive salary commensurate with experience - Meaningful equity compensation - Unlimited PTO and expectation that all employees take significant time off to rest, recharge, and enjoy life outside work - Excellent insurance with 100% of healthcare, vision, and dental premiums covered for the employee, and 80% coverage for dependents - 401(k) with company match

Listed by Lydian for a position based in the United States. Employers on this board attest they are hiring domestically.

Engineering

5 days ago

Senior Software Engineer

Gynger · New York City, NY

Pay

$175k–215k

Setting

On-site

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Gynger is the agentic credit risk function for tech CFOs - unlocking embedded financing at the speed and scale of tech.

We're a cash flow management platform with embedded financing that gives B2B technology vendors the power to offer flexible payment terms to customers while securing upfront payment. Finance leaders use Gynger to combine actionable insights with capital, optimizing day to day cash flow, accelerating deal cycles, mitigating risk, and executing on long term strategy.

We're building the rails that financed tech B2B deals will run on. Our AI agents sit inside the credit and risk function, embedded directly in the sale, giving buyers buy-now-pay-later flexibility on their technology purchases while vendors get paid upfront.

Founded in 2021 and headquartered in NYC, Gynger has raised $20M in Series A funding with investment from Gradient Ventures, Velvet Sea, BAG Ventures, MXV Capital and others.

For the third year running, Gynger has been recognized as one of Built In's Best Places to Work 2026.

The Role

We're building the AI-native infrastructure for tech financing, and we're looking for a Senior Software Engineer who builds with AI, not just around it.

You'll help architect and develop the agentic systems that run our credit risk function — underwriting, risk monitoring, collections, and payments — as complete processes an agent can carry from start to finish, rather than a single feature layered on top of a workflow. You'll work across the stack, with particular depth on the backend: scalable APIs, thoughtful data architecture, and services built to support real financial workflows. You'll also help shape how we build, bringing modern AI-assisted development practices into our everyday work and helping our engineering standards evolve alongside the tools themselves.

This is a role for someone who wants a hand in shaping the product, the architecture, and the way the team works, not just executing what's already been decided.

Listed by Gynger for a position based in the United States. Employers on this board attest they are hiring domestically.

Engineering

6 days ago

Staff Software Engineer, Internal Tools & Automation

Crusoe · San Francisco, California, USA

Pay

$215k–260k

Setting

On-site

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Crusoe is on a mission to accelerate the abundance of energy and intelligence. As the only vertically integrated AI infrastructure company built from the ground up, we own and operate each layer of the stack — from electrons to tokens — to power the world's most ambitious AI workloads. When you join Crusoe, you join a team that is building the future, faster. We're in the midst of the greatest industrial revolution of our time. The demand for AI compute is boundless, and power is a bottleneck. We're solving that — with an energy-first approach that makes AI infrastructure better for the world and faster for the people innovating with AI. We're looking for problem-solving, opportunity-finding teammates with a sense of urgency, who believe in the scale of our ambition and thrive on a path not fully paved — people who want to grow their careers alongside a team of experts across energy, manufacturing, data center construction, and cloud services. If you want to do the most meaningful work of your career, help our customers and partners advance their AI strategies, and be part of a high-performing team that believes in each other, come build with us at Crusoe. About the Role: As a Forward-Deployed Engineer, you will embed with another Crusoe team, such as SRE, Finance, Sales, People Ops, or a product group. You will learn how they operate and build software that helps them take the next action, not just describe the problem. This is a forward-deployed engineering role serving internal teams. Your customer is a Crusoe team. Your product is the application, automation, or agent that makes their work faster, clearer, and more dependable. Success is measured by adoption and by the time and effort you return to the team. This is also a new function. You will be one of its first engineers and will help shape how it operates. Several capabilities have matured recently. Modern BI tools now support write-back, so dashboards can update real records instead of only displaying them. Company data and operational context are reachable by AI agents through governed interfaces. Automation platforms and a shared library of reusable skills let you connect actions across many source systems, including CRM, support, infrastructure inventory, and the data warehouse. Together, these capabilities allow an embedded engineer to deliver interactive tooling in days instead of quarters. We are looking for engineers who want to use that leverage to help internal teams move faster with confidence. What You'll Be Working On: - Embed with a stakeholder team. Participate in their rituals, observe manual workflows, and identify high-leverage work that software can remove. - Build applications. Build interactive tools that take action: read data, apply decisions, and write results back to systems of record. - Automate real workflows. Replace repetitive work with pipelines and agents that run independently and involve a person when judgment is required. - Own the work end to end. Scope problems with stakeholders, then build, deploy, measure adoption, and iterate. You are accountable for outcomes, with support from partner teams. - Contribute to the platform. Turn reusable parts of your work, such as skills, integrations, or UI patterns, into shared building blocks that accelerate future engagements. - Keep it correct. Build on sources of truth, respect governance and access controls, and make tooling reliable enough for daily operational use. What You'll Bring to the Team: - 8+ years building and owning production software. You write clean code, ship it, and remain accountable for it in production. - Staff-level scope and judgment. You can take an ambiguous, greenfield charter and turn it into a plan and shipped software with limited direction. You raise technical standards and help engineers around you grow. - Full-stack engineering skill. You can build user-facing interfaces, backend services and APIs, and the supporting data layer. - Strong SQL and data modeling. You can navigate a data warehouse, reason about pipelines, and validate numbers before relying on them. - Product mindset and stakeholder fluency. You collaborate well with non-engineers, translate manual processes into clear tools, and push back when a request is not the right solution. - Fast delivery with attention to correctness. You get a useful version in front of users quickly, then harden it thoughtfully. You maintain a clear standard for completion. - Comfort with AI-assisted development. You use LLM agents and automation platforms effectively, and understand where guardrails are required. - Strong ownership. You measure success by whether stakeholder work becomes easier, faster, and more reliable. Bonus Points - Experience as a forward-deployed, solutions, or embedded engineer. - Prior BI or analytics engineering work with tools such as Sigma, Looker, dbt, or Tableau. - Familiarity with automation platforms such as Workato or n8n. - Experience building on MCP, agent frameworks, or LLM tool use. - Comfort in an early-stage environment with a high degree of ambiguity. Benefits: - Competitive compensation and equity packages - Restricted Stock Units - Paid time off, paid holidays & leave of absence programs - Comprehensive health, dental & vision insurance - Employer contributions to HSA account - Paid parental leave - Paid life insurance, short-term and long-term disability - Professional development & tuition reimbursement - Mental health & wellness support - Commuter benefits (parking & transit) - Cell phone stipend - 401(k) Retirement plan with company match up to 4% of salary - Volunteer time off - Global travel insurance & emergency assistance - Daily meals allowance - Additional perks & programs specific to location Compensation Range Compensation will be paid in the range of up to $215,000 -$260,000 + Bonus. Restricted Stock Units are included in all offers. Compensation to be determined by the applicant's knowledge, education, and abilities, as well as internal equity and alignment with market data. Crusoe is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, disability, genetic information, pregnancy, citizenship, marital status, sex/gender, sexual preference/ orientation, gender identity, age, veteran status, national origin, or any other status protected by law or regulation.

Listed by Crusoe for a position based in the United States. Employers on this board attest they are hiring domestically.

Engineering

7 days ago

Software Engineer, Terminal Interface

Normal Computing · New York City, New York, USA

Pay

$200k–400k

Setting

On-site

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NORMAL COMPUTING | BUILD WITH US Normal is an applied AI company solving the hardest problems in AI and silicon. We build foundational hardware and software for the semiconductor industry, critical AI infrastructure, and the broader systems that power our world, in partnership with the world's most advanced institutions. We work as one team across New York City, Silicon Valley (Mountain View), London, Copenhagen, and Seoul. THE ROLE Normal CLI is how semiconductor engineers do AI-assisted verification work. It is a large interactive terminal application, built in Python and Textual, that design verification engineers keep open all day, usually in environments we do not control: remote workstations inside chip companies, SSH sessions, tmux, Windows and WSL. Our users are accustomed to terminal products, and for many of them this is the first and only surface of Normal they will use. We expect that to remain true. We are hiring the engineer who will own it as a product: productionizing what began as a research tool and giving it a dedicated end-user focus. You will own the interaction model and the information design — how people enter and edit instructions, how a long agent run stays legible while it streams, how tool use and proposed changes are presented for review, and how work is interrupted, resumed, and recovered after a failure. You will also own the local session client beneath it, and be a leading voice in the client API the rest of our product is built on. The boundaries matter here. Our ML and research engineers keep the harness — the skills, tools, hooks, and model behavior that make the agent good at chip verification. You take the application those capabilities reach users through. You will sit on the product engineering team that also builds our desktop workbench, our web product, and our agent orchestration, so the terminal moves into the same product as everything else, with the same vocabulary, state, and quality bar. On any given day, you might rework how a long verification run folds and summarizes itself so an engineer can read it at a glance, chase down why text input breaks under one customer's terminal and IME combination, turn a recurring support thread into a reusable component and a snapshot test, or push back on a runtime event shape that cannot be rendered well. WHAT YOU WILL OWN - The terminal application: Information architecture and interaction across commands, navigation, input and editing, streamed output, progress, review, interruption, recovery, empty states, and errors that tell the user what to do next. - Cross-platform behavior: Correct, fast behavior across terminals, shells, multiplexers, remote sessions, macOS, Linux, Windows and WSL, non-English input and IMEs, and constrained customer environments. - The client boundary: The local session client, and a leading voice in the structured-event interface it consumes. You shape what the runtime emits so the UI does not have to infer intent from formatted text. - Standards other contributors build against: Define the command, picker, progress, output, and review patterns that research and product engineers use when they add domain workflows, and keep the experience coherent as they do. - Responsiveness under load: Streaming, cancellation, concurrency, and event-loop behavior for work that runs for a long time and must stay interruptible and understandable throughout. - A coherent product across surfaces: Shared terminology, state, authentication, and handoffs between the terminal and the rest of our EDA product, so users moving between them do not have to learn two systems. - Architecture: Evolve a large Textual application toward reusable components and a clear line between product UI, domain logic, and runtime concerns. - Confidence to change it: Snapshot and visual-regression coverage, packaging, installation, self-update, and the tests that make it safe to change an interactive application people depend on. WHAT MAKES YOU A GREAT FIT - 4+ years of software engineering experience, including significant time building and maintaining an interactive terminal application, TUI, or comparably rich local client — not command wrappers. - Experience taking on an existing codebase and improving it without breaking what already worked. - Familiarity with what makes terminal software hard: keyboard and text input, rendering performance, inconsistent terminal capabilities, process and signal handling, and behavior that differs across platforms and environments. - Strong engineering fundamentals. The application is written in Python and Textual; we weigh depth and judgment above prior experience with either. - Experience with event-driven or asynchronous applications: streaming data, local processes, cancellation, concurrency, persistence, and recovery from partial failure. - A high bar for interface details — defaults, error messages, empty states, wording — and a habit of fixing them before users report them. - The ability to debug across boundaries, from a keystroke in a terminal emulator through the application to the runtime. - Experience testing interactive software, and judgment about which behavior is worth pinning down. - Comfort working with researchers and domain experts, and the ability to learn an unfamiliar technical domain well enough to represent an expert workflow accurately. - Pragmatic judgment about when to invest in a durable abstraction and when to ship the straightforward version. BONUS POINTS Experience with any of the following is helpful, but not required: - Textual, Rich, prompt-toolkit, curses, Bubble Tea, Ratatui, Ink, or another terminal UI framework - PTYs, terminal emulation, multiplexers, or remote shell and host abstractions - Designing human-in-the-loop experiences for coding agents, AI tools, or other long-running automated systems - Cross-platform packaging, self-update systems, internationalization, IME support, or visual regression testing - Electron or another desktop framework, particularly embedding a CLI, TUI, or agent runtime - Semiconductors, EDA, or hardware engineering workflows Equal Employment Opportunity Statement Normal Computing is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status, or any other legally protected status. Accessibility Accommodations Normal Computing is committed to providing reasonable accommodations to individuals with disabilities. If you need assistance or an accommodation due to a disability, please let us know at accommodations@normalcomputing.com. Privacy Notice By submitting your application, you agree that Normal Computing may collect, use, and store your personal information for employment-related purposes in accordance with our Privacy Policy.

Listed by Normal Computing for a position based in the United States. Employers on this board attest they are hiring domestically.

Engineering

7 days ago

Senior Data Engineer

Octopus Energy · London (GB)

Pay

$65k–175k

Setting

On-site

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We're making energy fair, clean, and simple for all using technology.

Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier. By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we made it happen and in 2025, we became Britain’s largest energy supplier.

Octopus Energy Group is a global energy transition collective. 10 businesses working across 4 continents to tackle energy transformation at nearly every front.

And we constantly push to make energy better. Tirelessly campaigning for fair protections for customers. And building innovative technologies that forge a path to a green energy system.

We’re made up of 10,000+ authentic, committed people working around the world on stuff you'd never expect. We're united by a shared goal: to drive the global green energy revolution. Read our Spotlight series to meet some of the team.

To deliver on this mission, we are looking for a Senior Data Engineer to join the Flexibility team.

The Flexibility team was established in early 2026, and has been growing throughout the year. The team is focused on greenfield opportunities at the cutting edge of Octopus' flexibility strategy, and aims to enable rapid response to global flex opportunities.

They are building the next generation of products and tools to make energy more flexible. These include our flagship Intelligent Octopus product automating demand shift for 300,000 customers with electric cars, home batteries or smart heating devices, saving 2 million customers money through Saving Sessions and Free Electricity Sessions, and managing 568MW of large grid-scale batteries to balance the system. The team develops products that are used by millions of customers, helping boost renewables use and decarbonise energy systems worldwide.

We embrace flat hierarchies and an open, agile culture that fosters innovation, flexibility, and creativity.

We don’t hang our personalities up with our coats and nor should you. At Octopus, we hire great people who get stuff done, all whilst being themselves.

If this sounds exciting, we’d love to chat.

Listed by Octopus Energy for a position based in the United States. Employers on this board attest they are hiring domestically.

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